1
|
Mao Z, Bleiel H, Beuer F, Böse MWH, Soetebeer M. Occlusal changes on implant-supported single crowns with one year follow-up after loading: A systematic review and meta-analysis. J Dent 2024; 146:105000. [PMID: 38734300 DOI: 10.1016/j.jdent.2024.105000] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2024] [Accepted: 04/17/2024] [Indexed: 05/13/2024] Open
Abstract
OBJECTIVE This systematic review evaluated the occlusal changes after loading with implant-supported single crowns. SOURCES An electronic literature search was conducted in PubMed, Embase and Cochrane library for randomized (RCTs) or non-randomized controlled clinical trials (CCTs), with a minimum of 10 patients. STUDY SELECTION Studies reporting the occlusal force changes on implant-supported single crowns - with natural teeth as antagonist - measured at baseline and after loading periods were included. 4 CCTs including 133 ISCs in posterior sites were included for meta-analysis. All analyzed ISCs had no contact at a light bite and a light contact at a heavy bite in MIP at loading (baseline). DATA The relative occlusal forces (ROFs) of each implant-supported single crown (ISC) or control tooth (CT) were extracted. ROFs were defined as percentage of the total occlusal force of the entire dentition at maximum intercuspal position (MIP). A meta-analysis was conducted to compare the ROF changes at different follow-up periods and the weighted mean differences in ROF between ISCs and CTs were pooled and analyzed. The amount of change in ROF was significantly lower in 6 to 12 months after loading comparing the follow-up period between baseline and 6 month (p < 0.05). At baseline and 3-month follow-up, CTs presented significant higher ROF than ISCs (p < 0.05), while no significant difference was found after half year following. CONCLUSIONS This study showed that the ROF changes significantly over time after loading of ISCs. It might prove that the occlusal concept defined at the time of prosthetic delivery changes or adapts naturally over time. CLINICAL SIGNIFICANCE The function of specific implant occlusal concept (no contact at a light bite and a light contact at a heavy bite in MIP) is limited over time and careful monitoring and occlusal adjustments should be recommendable during the first-year follow-up.
Collapse
Affiliation(s)
- Zhen Mao
- Department of Prosthodontics, Geriatric Dentistry and Craniomandibular Disorders, Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Aßmannshauser Str. 4-6, 14197 Berlin, Germany.
| | - Hannah Bleiel
- Department of Prosthodontics, Geriatric Dentistry and Craniomandibular Disorders, Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Aßmannshauser Str. 4-6, 14197 Berlin, Germany
| | - Florian Beuer
- Department of Prosthodontics, Geriatric Dentistry and Craniomandibular Disorders, Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Aßmannshauser Str. 4-6, 14197 Berlin, Germany
| | - Mats Wernfried Heinrich Böse
- Department of Prosthodontics, Geriatric Dentistry and Craniomandibular Disorders, Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Aßmannshauser Str. 4-6, 14197 Berlin, Germany
| | - Maren Soetebeer
- Department of Prosthodontics, Geriatric Dentistry and Craniomandibular Disorders, Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Aßmannshauser Str. 4-6, 14197 Berlin, Germany
| |
Collapse
|
2
|
Chan H, Alimujiang A, Fong SI, Wu ML, Liang R, Lai PY, Wei HW, Shen S. Use of T-Scan III in analyzing occlusal changes in molar fixed denture placement. BMC Oral Health 2024; 24:264. [PMID: 38388920 PMCID: PMC10885451 DOI: 10.1186/s12903-024-04014-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2023] [Accepted: 02/12/2024] [Indexed: 02/24/2024] Open
Abstract
BACKGROUND This study aims to analyze the longitudinal variation of occlusal force distribution prior to and after fixed restoration for molar full-crowns with T-SCAN III which provide reference for occlusal adjustment and long-term maintenance. METHODS We enrolled a total of 20 patients who received conventional restorative treatment for molars. The occlusion examination was conducted in 3 stages (before placement, immediately after placement, and 3 months after placement) using T-SCAN III (Tekscan South Boston, MA, USA, 10.0) to examine and measure the occlusal contact areas of the full dentition. RESULTS The results indicated that the occlusal force distribution in the molar region of the patients changed before and after the fixed restoration, but the percentages of occlusal force in the dental arch of the molar did not differ significantly before and after the restoration (P > 0.05). Three months after the fixed restoration, the percentage of occlusal force in the restored dental arches of lateral teeth increased significantly (P < 0.05). CONCLUSION The results of this study indicated that the occlusal forces of the patients changed with tooth movement and adaptation, which is mainly reflected in the increasing occlusal force. Quantitative occlusal force analysis using T-SCAN III occlusal analyzer can provide more objective and accurate data to effectively guide clinical occlusion adjustments.
Collapse
Affiliation(s)
- Hei Chan
- School of Stomatology, Jinan University, Guangzhou City, 510632, Guangdong Province, China
| | - Adili Alimujiang
- School of Stomatology, Jinan University, Guangzhou City, 510632, Guangdong Province, China
| | - Sin Iok Fong
- School of Stomatology, Jinan University, Guangzhou City, 510632, Guangdong Province, China
| | - Ming-Le Wu
- Department of Stomatology, Affiliated Stomatological Hospital of Jinan University (Daliang Hospital Foshan City), Shunde District, Foshan City, 528399, Guangdong Province, China
| | - Ran Liang
- School of Stomatology, Jinan University, Guangzhou City, 510632, Guangdong Province, China
| | - Peng-Yu Lai
- School of Stomatology, Jinan University, Guangzhou City, 510632, Guangdong Province, China
| | - Hui-Wen Wei
- School of Stomatology, Jinan University, Guangzhou City, 510632, Guangdong Province, China
| | - Shan Shen
- Department of Stomatology, The First Affiliated Hospital of Jinan University, No. 613, Huangpu Avenue West, Tianhe District, Guangzhou, 510632, China.
| |
Collapse
|
3
|
Ashok S, Batra P, Sharma K, Raghavan S, Talwar A, Srivastava A, Duggal I. An assessment of masticatory efficiency and occlusal load distribution in adolescent patients undergoing orthodontic treatment with functional jaw orthopedics: A prospective cohort study. JOURNAL OF STOMATOLOGY, ORAL AND MAXILLOFACIAL SURGERY 2023; 124:101570. [PMID: 37507010 DOI: 10.1016/j.jormas.2023.101570] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2023] [Revised: 06/22/2023] [Accepted: 07/23/2023] [Indexed: 07/30/2023]
Abstract
INTRODUCTION Functional jaw orthopaedics, produces a radical change in the occlusal scheme and the masticatory apparatus, particularly in patients with Class II malocclusion. It remains to be seen how the changes brought about by a functional appliance alter the masticatory ability of a growing child, who needs the necessary nutrition to properly grow the craniofacial region. MATERIALS AND METHODS Pretreatment and Post-treatment values of masticatory efficiency and the distribution of the occlusal load at centric occlusion were evaluated and compared for 20 patients with Class II division 1 malocclusion undergoing functional jaw orthopaedics. RESULTS Significant increase in the masticatory efficiency was seen during and after treatment (p < 0.5) There was an increase in the anterior distribution of occlusal load associated with a concomitant decrease in the posterior region at centric occlusion. CONCLUSION Improvement in the masticatory efficiency was observed after treatment of a retrognathic mandible with functional jaw orthopaedics in the adolescent participants with Class II malocclusion. This highlights the importance of treatment with functional jaw orthopaedics, which apart from providing esthetic and functional improvement also improves the ability of a growing child to extract proper nutrition from his/her diet.
Collapse
Affiliation(s)
- Shoj Ashok
- Department of Orthodontics and Dentofacial Orthopedics, Institute of Dental Studies and Technologies, India
| | - Puneet Batra
- Post Graduate Board of Studies, Department of Orthodontics and Dentofacial Orthopedics, Manav Rachna Dental College, Faridabad, India
| | | | | | - Aditya Talwar
- Department of Orthodontics and Dentofacial Orthopedics, Manav Rachna Dental College, Faridabad, Haryana, India.
| | | | - Isha Duggal
- Division of Orthodontics & Dentofacial Deformities, CDER, All India Institute of Medical Sciences, New Delhi, India
| |
Collapse
|
4
|
Abutayyem H, M Annamma L, Desai VB, Alam MK. Evaluation of occlusal bite force distribution by T-Scan in orthodontic patients with different occlusal characteristics: a cross sectional-observational study. BMC Oral Health 2023; 23:888. [PMID: 37986159 PMCID: PMC10662916 DOI: 10.1186/s12903-023-03544-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2023] [Accepted: 10/15/2023] [Indexed: 11/22/2023] Open
Abstract
BACKGROUND The aim of orthodontic treatment, apart from esthetic and functional corrections, is uniform force distribution. Hence Occlusal analysis using a T scan gives scope for a precisely targeted treatment plan. The T-scan evaluation of occlusal force, time, and location of contacts from initial occlusal contact to maximum intercuspation enables the orthodontist to sequentially balance the occlusal forces on the right and left sides through specific treatment plan options. OBJECTIVE The current study aimed to determine the force distribution in the different individuals by using a T-Scan as well as the net discrepancies of forces generated at a maximum intercuspation position in the first molar region between the left and right sides of the mouth. METHODS This is a descriptive-correlational study that was carried out in Ras Al Khaimah College of Dental Sciences clinics and Ajman University clinics from January 2020 to September 2022 by using the convenience sampling technique. The T-scan III Novus was employed in this investigation to record multi-bite scans for several patients. T-scan was utilised to examine various malocclusions. RESULTS The present study consisted of 158 participants. Analysis of Variance (ANOVA) showed that there is a statistically significant difference in the percentage of force between the three types of malocclusions (I, II, and III) on the right molar side (B-16 and B-46) (p < 0.05). Moreover, the overall discrepancy showed a statistically significant difference in the three types of malocclusion classifications (p < 0.05). On the other hand, there was no statistically significant difference in the percentage of force between B-26 and B-36 (p > 0.05). Post hoc analysis showed a statistically significant difference in the percentage of force between malocclusion classes I and III on the right molar, with a mean difference of 4.11190 (p < 0.05). Similarly, there was a statistically significant difference in B-46 between Malocclusion Classes I and II, 4.01806 (p < 0.05). Additionally, post hoc analysis showed a statistically significant difference between malocclusion classes I and III, with a mean difference of -4.79841 (p < 0.05) on the right molar. CONCLUSION The T-Scan is a useful tool for assessing occlusal discrepancies and can be helpful during treatment planning and follow-up, especially for orthognathic surgery patients. A T-scan could be used in orthodontic therapy in a simple and efficient way. Also, it turned out to be a useful tool for diagnosing problems and gave us new information about how therapies work. In this study, T-Scan showed that it can measure occlusal forces in timing in an objective, accurate, and repeated manner. The current study found that T-Scan was better able to report the difference in the percentage of force on the right molar side than on the left side.
Collapse
Affiliation(s)
- Huda Abutayyem
- Department of Clinical Sciences, College of Dentistry, Ajman University and Center of Medical and Bioallied Health Sciences, Ajman University, Ajman, United Arab Emirates.
| | - Lovely M Annamma
- Department of Clinical Sciences, College of Dentistry, Ajman University and Center of Medical and Bioallied Health Sciences, Ajman University, Ajman, United Arab Emirates
| | - Vijay B Desai
- Department of Clinical Sciences, College of Dentistry, Ajman University and Center of Medical and Bioallied Health Sciences, Ajman University, Ajman, United Arab Emirates
| | - Mohammad Khursheed Alam
- Orthodontic Division, Preventive Dentistry Department, Jouf University, Sakaka, Aljouf, Saudi Arabia
- Department of Dental Research Cell, Saveetha Institute of Medical and Technical Sciences, Saveetha Dental College and Hospitals, Chennai, 600077, India
- Department of Public Health, Faculty of Allied Health Sciences, Daffodil International University, Dhaka, 1207, Bangladesh
| |
Collapse
|
5
|
Wiechens B, Quast A, Klenke D, Brockmeyer P, Schliephake H, Meyer-Marcotty P. Evaluation of occlusal function during orthognathic therapy : A prospective clinical trial using a digital registration method. J Orofac Orthop 2023; 84:267-277. [PMID: 35226131 PMCID: PMC10462559 DOI: 10.1007/s00056-022-00382-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2021] [Accepted: 01/17/2022] [Indexed: 11/28/2022]
Abstract
OBJECTIVES Reduced occlusal function is a main characteristic of orthognathic patients. The present study aimed to investigate the extent of therapy-induced functional improvements in occlusal function using a digital diagnostic method. METHODS This prospective clinical study included 41 orthognathic patients (24 women and 17 men, median age 27.26 ± 8.2 years) and 10 control patients (5 women and 5 men, median age 29.8 ± 13.5 years) with neutral skeletal and dental configurations. The patients were divided into classes I, II and III based on their cephalometry. Digital occlusal registrations in habitual occlusion in an upright sitting position were taken before (T1) and after (T2) therapy using the T‑Scan Novus (Tekscan, South Boston, MA, USA) application. RESULTS Class II and III patients showed a significantly less efficient occlusal pattern than the untreated controls regarding total antagonism (p < 0.001), time of occlusion (p = 0.004), occlusal asymmetry (p = 0.001), anterior antagonism (p < 0.001) and posterior antagonism (p < 0.001). After therapy, the occlusal pattern increased in both therapy groups, where class III patients became indistinguishable from the controls, and class II patients differed only in posterior antagonism (p = 0.035). CONCLUSIONS The digital occlusal registration method proved to be a useful diagnostic tool and provided new insights into therapeutic effects in orthognathic patients. By precisely adjusting the occlusal function, masticatory performance improved significantly. CLINICAL RELEVANCE Severe malocclusion leads to a significantly lower masticatory performance for patients, which can be improved by orthognathic therapy and captured by digital occlusal registration.
Collapse
Affiliation(s)
- Bernhard Wiechens
- Department of Orthodontics, University Medical Center Goettingen, Robert-Koch-Str. 40, 37075, Goettingen, Germany.
| | - Anja Quast
- Department of Orthodontics, University Medical Center Goettingen, Robert-Koch-Str. 40, 37075, Goettingen, Germany
| | - Daniela Klenke
- Department of Orthodontics, University Medical Center Goettingen, Robert-Koch-Str. 40, 37075, Goettingen, Germany
| | - Phillipp Brockmeyer
- Department of Oral and Maxillofacial Surgery, University Medical Center Goettingen, Robert-Koch-Str. 40, 37075, Goettingen, Germany
| | - Henning Schliephake
- Department of Oral and Maxillofacial Surgery, University Medical Center Goettingen, Robert-Koch-Str. 40, 37075, Goettingen, Germany
| | - Philipp Meyer-Marcotty
- Department of Orthodontics, University Medical Center Goettingen, Robert-Koch-Str. 40, 37075, Goettingen, Germany
| |
Collapse
|
6
|
Jauregi M, Amezua X, Iturrate M, Solaberrieta E. Improving the precision of recordings acquired with digital occlusal analyzers: A dental technique. J Prosthet Dent 2023:S0022-3913(23)00503-6. [PMID: 37661547 DOI: 10.1016/j.prosdent.2023.08.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2023] [Revised: 07/29/2023] [Accepted: 08/01/2023] [Indexed: 09/05/2023]
Abstract
A technique to improve the precision of recordings acquired with the 2 main digital occlusal analyzers on the market (T-Scan and OccluSense) is presented. This technique consists of using digital occlusal analyzers with a customizable centering tray. The virtual design of the centering tray is available online, together with that of the adapters required for both digital occlusal analyzers. The designs can be downloaded and additively manufactured for clinical use. These parts improve the positioning of the piezoelectric film sensors of the digital occlusal analyzers in the patient's mouth and thus the precision of their records. Improving the precision of the records of the digital occlusal analyzers is especially important for the comparison of records obtained at different stages of rehabilitation treatment.
Collapse
Affiliation(s)
- Mikel Jauregi
- Associate Professor, Department of Mechanical Engineering, Faculty of Engineering Gipuzkoa, University of the Basque Country (UPV/EHU), San Sebastian, Spain
| | - Xabier Amezua
- Assistant Professor, Department of Graphic Design and Engineering Projects, Faculty of Engineering Bilbao, University of the Basque Country (UPV/EHU), Bilbao, Spain
| | - Mikel Iturrate
- Assistant Professor, Department of Graphic Design and Engineering Projects, Faculty of Engineering Gipuzkoa, University of the Basque Country (UPV/EHU), San Sebastian, Spain
| | - Eneko Solaberrieta
- Professor, Department of Graphic Design and Engineering Projects, Faculty of Engineering Gipuzkoa, University of the Basque Country (UPV/EHU), San Sebastian, Spain.
| |
Collapse
|
7
|
Jauregi M, Amezua X, Iturrate M, Solaberrieta E. Repeatability and reproducibility of 2 digital occlusal analyzers for measuring the right- and left-side balance of occlusal contact forces: An in vitro study. J Prosthet Dent 2023:S0022-3913(23)00490-0. [PMID: 37661548 DOI: 10.1016/j.prosdent.2023.07.026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2023] [Revised: 07/22/2023] [Accepted: 07/25/2023] [Indexed: 09/05/2023]
Abstract
STATEMENT OF PROBLEM Although different digital occlusal analyzers have been marketed, comparative studies are lacking. PURPOSE The purpose of this in vitro study was to compare the repeatability and reproducibility of 2 different digital occlusal analyzers (T-Scan and OccluSense) for measuring the right- and left-side balance of occlusal contact forces. MATERIAL AND METHODS The repeatability and reproducibility of the 2 digital occlusal analyzers for measuring the balance of occlusal contact forces were determined and compared by using the Gauge Repeatability and Reproducibility tests based on the International Organization for Standardization (ISO), ISO 5725-2 and ISO 5725-3 standards. Ten different dental casts were mounted in the maximum intercuspation position on a semi-adjustable articulator. Then, the balance of occlusal contact forces in each of the 10 articulated dental casts was measured 24 times with each of the 2 digital occlusal analyzers. In addition, as the OccluSense, unlike the T-Scan, does not have a centering support for the piezoelectric film sensor, measurements with it were performed without and with a custom-designed and manufactured centering support. Finally, the repeatability and reproducibility of both digital occlusal analyzers were determined and compared using the Gauge Repeatability and Reproducibility tests. RESULTS The repeatability and reproducibility tests revealed that only 0.8% of the variance of the measurements obtained with the T-Scan was due to repeatability and reproducibility (0.4% repeatability, 0.4% reproducibility). In contrast, 12% of the variance of the measurements obtained with the OccluSense was due to repeatability and reproducibility (2.2% repeatability, 9.8% reproducibility). However, when using OccluSense with the centering support, the variance decreased to 6.4% (2.8% repeatability, 3.6% reproducibility). According to the Automotive Industry Action Group classification, the repeatability and reproducibility of the T-Scan were good, those of the OccluSense poor, and those of the OccluSense with the centering support medium. CONCLUSIONS The repeatability and reproducibility of the T-Scan were significantly better than those of the OccluSense for measuring the balance of occlusal contact forces. Furthermore, the repeatability and reproducibility of the OccluSense were significantly improved when used with a device to center the piezoelectric film sensor between the incisors. Nevertheless, the repeatability and reproducibility of the T-Scan were better.
Collapse
Affiliation(s)
- Mikel Jauregi
- Associate Professor, Department of Mechanical Engineering, Faculty of Engineering Gipuzkoa, University of the Basque Country (UPV/EHU), San Sebastian, Spain
| | - Xabier Amezua
- Assistant Professor, Department of Graphic Design and Engineering Projects, Faculty of Engineering Bilbao, University of the Basque Country (UPV/EHU), Bilbao, Spain
| | - Mikel Iturrate
- Assistant Professor, Department of Graphic Design and Engineering Projects, Faculty of Engineering Gipuzkoa, University of the Basque Country (UPV/EHU), San Sebastian, Spain
| | - Eneko Solaberrieta
- Professor, Department of Graphic Design and Engineering Projects, Faculty of Engineering Gipuzkoa, University of the Basque Country (UPV/EHU), San Sebastian, Spain.
| |
Collapse
|
8
|
Ortún-Terrazas J, Cegoñino J, Pérez Del Palomar A. In silico approach towards neuro-occlusal rehabilitation for the early correction of asymmetrical development in a unilateral crossbite patient. INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN BIOMEDICAL ENGINEERING 2023; 39:e3688. [PMID: 36726272 DOI: 10.1002/cnm.3688] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Revised: 01/09/2023] [Accepted: 01/29/2023] [Indexed: 05/13/2023]
Abstract
Neuro-occlusal rehabilitation (N.O.R.) is a discipline of the stomatognathic medicine that defends early treatments of functional malocclusions, such as unilateral crossbite, for the correction of craniofacial development, avoiding surgical procedures later in life. Nevertheless, N.O.R.'s advances have not been proved analytically yet due to the difficulties of evaluate the mechanical response after the treatment. This study aims to evaluate computationally the effect of N.O.R.'s treatments during childhood. Therefore, bilateral chewing and maximum intercuspation occlusion were modelled through a detailed finite element model of a paediatric craniofacial complex, before and after different selective grinding-alternatives. This model was subjected to the muscular forces derived from a musculoskeletal model and was validated by the occlusal contacts recorded experimentally. This approach yielded errors below 2% and reproduced successfully the occlusal, muscular, functional and mechanical imbalance before the therapies. Treatment strategies balanced the occlusal plane and reduced the periodontal overpressure (>4.7 kPa) and the mandibular over deformation (>0.002 ε) on the crossed side. Based on the principles of the mechanostat theory of bone remodelling and the pressure-tension theory of tooth movement, these findings could also demonstrate how N.O.R.'s treatments correct the malocclusion and the asymmetrical development of the craniofacial complex. Besides, N.O.R.'s treatments slightly modified the stress state and functions of the temporomandibular joints, facilitating the chewing by the unaccustomed side. These findings provide important biomechanical insights into the use of N.O.R.'s treatments for the correction of unilateral crossbite, but also encourage the application of computing methods in biomedical research and clinical practise.
Collapse
Affiliation(s)
- Javier Ortún-Terrazas
- Escuela Superior de Ingeniería y Tecnología (ESIT), Universidad Internacional de La Rioja (UNIR), Logroño, La Rioja, Spain
- Instituto Tecnológico de Aragón (ITAINNOVA), Zaragoza, Zaragoza, Spain
| | - José Cegoñino
- Instituto Tecnológico de Aragón (ITAINNOVA), Zaragoza, Zaragoza, Spain
| | | |
Collapse
|
9
|
Jauregi M, Amezua X, Manso AP, Solaberrieta E. Positional influence of center of masticatory forces on occlusal contact forces using a digital occlusal analyzer. J Prosthet Dent 2023:S0022-3913(23)00171-3. [PMID: 37003941 DOI: 10.1016/j.prosdent.2023.03.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2022] [Revised: 03/07/2023] [Accepted: 03/07/2023] [Indexed: 04/03/2023]
Abstract
STATEMENT OF PROBLEM Digital occlusal analyzers allow the recording of dental contact forces. Some authors assume a unique location for the center of contact forces at the position of maximum intercuspation, while others indicate variations in dental contact forces when recorded at different times of the day. Which approach is more appropriate is unclear. PURPOSE The purpose of this in vitro study was to analyze whether a change in the balance of masticatory forces influences the location of the center of contact forces and its magnitude. MATERIAL AND METHODS Three different dental casts, selected under dental criteria, were mounted in maximum intercuspation on a semiadjustable articulator equipped with a pattern indicating 9 different force application points (intersection point between 3 longitudinal rows and 3 transverse columns). A force of constant magnitude (169 N) was applied 10 times at each of the application points, and occlusal forces were recorded with a digital occlusal analyzer. Then, two variables were studied: the location of the center of contact forces and its magnitude. Each force application position (9 positions × 3 dental casts=27 in total) was repeated 10 times, and measured data were statistically analyzed with 2-way repeated measures ANOVA (α=.05) test. RESULTS The repeatability of the method indicated that the coefficient of variation mean was 0.37% in the location of the center of contact forces and that its magnitude was 3.70%. The 2-way repeated measures ANOVA test revealed statistically significant variations in the location of the center of contact forces and its magnitude, revealing that longitudinal changes of the application point of masticatory forces affected the magnitude of contact forces and that longitudinal and transverse changes of the application point of masticatory forces affected the location of the center of contact forces. CONCLUSIONS The location of the center of contact force and its magnitude provided by a digital occlusal analyzer at the position of maximum intercuspation are not necessarily unique to each articulated dental cast. Even if the intensity of the masticatory force remains unchanged, changes in its lateral or longitudinal balance also influence the result of the occlusion forces.
Collapse
Affiliation(s)
- Mikel Jauregi
- Associate Professor, Department of Mechanical Engineering, Faculty of Engineering Gipuzkoa, University of the Basque Country (UPV/EHU), San Sebastian, Spain
| | - Xabier Amezua
- Assistant Professor, Department of Graphic Design and Engineering Projects, Faculty of Engineering Bilbao, University of the Basque Country (UPV/EHU), Bilbao, Spain
| | - Angel P Manso
- Associate Professor, Department of Graphic Design and Engineering Projects, Faculty of Engineering Gipuzkoa, University of the Basque Country (UPV/EHU), San Sebastian, Spain
| | - Eneko Solaberrieta
- Associate Professor, Department of Graphic Design and Engineering Projects, Faculty of Engineering Gipuzkoa, University of the Basque Country (UPV/EHU), San Sebastian, Spain.
| |
Collapse
|
10
|
Zhang R, Hao X, Zhang K. Evaluation of two different occlusal patterns on single posterior implant-supported crowns: A 12-month prospective study of occlusal analysis. J Prosthet Dent 2023:S0022-3913(22)00759-4. [PMID: 36610845 DOI: 10.1016/j.prosdent.2022.11.026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Revised: 11/04/2022] [Accepted: 11/04/2022] [Indexed: 01/07/2023]
Abstract
STATEMENT OF PROBLEM According to the concept of implant-protected occlusion, light occlusion and late contact could prevent implants from occlusal overload. However, clinical data demonstrating how light occlusion differs from normal occlusion are lacking. PURPOSE The purpose of this prospective clinical study was to characterize the occlusal variation of single posterior implant-supported crowns with or without light occlusion. MATERIAL AND METHODS Participants with a single missing posterior maxillary or mandibular molar who were to receive implant-supported zirconia ceramic crowns were enrolled. The participants were divided into a light occlusion group, in which a 12-μm articulating film could be removed from the implant-supported crown and opposing natural teeth under the intercuspal position, and a normal occlusion group, in which the articulating film could not be removed. All participants underwent occlusal examinations using the T-scan III system, answered a satisfaction questionnaire using a visual analog scale (VAS), and received regular follow-ups. The participants were evaluated at 0.5, 3, 6, and 12 months after implant-supported crown delivery. The relative occlusal force of the implant-supported crowns, mesial teeth, control teeth (corresponding natural tooth on the dentition contralateral to each implant), and the occlusal contact time of implant-supported crowns were recorded. Moreover, the asymmetry index of the occlusal force and the VAS score were calculated. Two independent-sample tests were used to compare the 2 groups. The Wilcoxon rank sum and Mann‒Whitney tests were used to compare nonnormally distributed data (α=.001). RESULTS Fifty study participants with a mean ±standard deviation age of 36.97 ±7.34 years (23 men and 27 women aged 20 to 50 years) were followed for 0.5 to 12 months. No obvious complications of overloading were observed in either group. The mean ±standard deviation of the relative occlusal force of implant-supported crowns in the light occlusion group (from 4.91 ±3.52% to 10.34 ±4.35%) was always lower than that in the normal occlusion group (from 10.45 ±4.32% to 18.15 ±4.80%), while the mean ±standard deviation of the occlusal contact time in the light occlusion group (from 0.38 ±0.26 seconds to 0.10 ±0.07 seconds) was significantly later than that in the normal occlusion group (from 0.12 ±0.08 seconds to 0.04 ±0.02 seconds) (P<.001). The value of the asymmetry index of occlusal force remained within the normal range (10%). The VAS score in the normal occlusion group was significantly higher than that in the light occlusion group (P<.001). CONCLUSIONS Providing light occlusion to reduce occlusal force and delay the contact time was not stable over time. The relative occlusal force and occlusal contact time showed a similar development trend in both groups, and no obvious signs of occlusal overloading were observed in this study. Long-term follow-up is necessary for implant-supported prostheses because of the continuous increase in occlusal force.
Collapse
Affiliation(s)
- Ru Zhang
- Attending, Department of Prosthodontics, Capital Medical University School of Stomatology, Beijing Stomatological Hospital, Beijing, PR China
| | - Xiaoyu Hao
- Graduate Student, Department of Prosthodontics, Capital Medical University School of Stomatology, Beijing Stomatological Hospital, Beijing, PR China
| | - Kaiyu Zhang
- Associate Chief, Department of Oral and Maxillofacial Surgery, Capital Medical University School of Stomatology, Beijing Stomatological Hospital, Beijing, PR China.
| |
Collapse
|
11
|
Tammataratarn P, Chen MC, Lin CH, Wen-Ching Ko E. Sequential digital occlusal analysis in patients with skeletal Class III malocclusion with orthognathic surgery: Surgery-first vs orthodontic-first approach. Am J Orthod Dentofacial Orthop 2022; 162:927-936. [PMID: 36163310 DOI: 10.1016/j.ajodo.2021.07.030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2021] [Revised: 07/01/2021] [Accepted: 07/01/2021] [Indexed: 11/27/2022]
Abstract
INTRODUCTION This study compared changes in occlusal characteristics in patients with skeletal Class III malocclusion with surgery-first approach (SFA) and those with orthodontic-first approach (OFA) through digital occlusal analysis. METHODS In this prospective study, 90 consecutive subjects were divided into control, OFA, and SFA groups (30 per group). Force discrepancy, occlusal time, tooth contact, center of force, and force-time graph pattern were calculated for all samples using the T-Scan III system. Between-group differences were analyzed using a 1-way analysis of variance and generalized estimating equations. These parameters were calculated at the following time points: preoperatively, 1-month postoperatively (T1), 4-months postoperatively, and 1-year postoperatively (T3). RESULTS No significant differences were observed in the parameters between the experimental groups. The force discrepancy of the OFA and SFA groups decreased, approaching the value of controls at T3. The occlusal time significantly increased at T1 and progressively decreased at T3. The initial contact and maximum force were most frequently observed on molars, and its maximum force significantly decreased by 5.72% and 7.40% in the OFA and SFA groups at T3, respectively. The number of tooth contact was significantly reduced at T1 and gradually increased at T3. Moreover, after surgery, the force-time graph pattern was normalized, and the center of force tended to be more centric; however, the most frequent trajectory revealed premature contact during closing. CONCLUSIONS No significant difference was found in all parameters between the OFA and SFA groups. Occlusion deteriorated at 1 month postoperatively but gradually improved at 1 year postoperatively, approaching the controls.
Collapse
Affiliation(s)
- Paweena Tammataratarn
- Graduate Institute of Dental and Craniofacial Science, Chang Gung University, Taoyuan, Taiwan; Department of Craniofacial Orthodontics, Chang Gung Memorial Hospital, Taipei, Taiwan
| | - Min-Chi Chen
- Department of Public Health and Biostatistics Consulting Center, College of Medicine, Chang Gung University, Taoyuan, Taiwan
| | - Cheng-Hui Lin
- Department of Plastic Surgery and Reconstructive Surgery, Chang Gung Memorial Hospital, and Graduate Institute of Craniofacial and Oral Science, Chang Gung University, Taoyuan, Taiwan
| | - Ellen Wen-Ching Ko
- Graduate Institute of Dental and Craniofacial Science, Chang Gung University, Taoyuan, Taiwan; Department of Craniofacial Orthodontics, Chang Gung Memorial Hospital, Taipei, Taiwan.
| |
Collapse
|
12
|
Li Z, Liu L, Bai Q, Huang L, Li B, Yang L, Liang T, Sun H, Li D. Evaluation of the effect of T-Scan™ as an adjunct to stabilization splint in the treatment of temporomandibular joint disorders. Cranio 2022:1-10. [PMID: 36094222 DOI: 10.1080/08869634.2022.2113272] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
Abstract
OBJECTIVE To assess the effectiveness of the stabilization splint (SS) combined with the T-Scan™ III system in the treatment of temporomandibular joint disorder (TMD) with myofascial pain. METHODS Forty-eight enrolled patients were randomly assigned to the SS group or T-Scan™-guided SS group. Mandibular Function Impairment Questionnaire (MFIQ), Maximum Comfortable Opening (MCO), Visual Analog Scale (VAS), and Patient Health Questionnaire-9 (PHQ-9) were used as the outcome variables. RESULTS The occlusal contacts of patients in the SS plus T-Scan™ group showed lower Occlusal Time (OT), Disocclusion Time (DT), and Asymmetry Index of Occlusal Force (AOF) after occlusal adjustment under the guidance of the T-Scan™. Importantly, the TMD symptoms were alleviated more obviously in SS plus T-Scan™ group, with better scores for MCO and MFIQ. CONCLUSION T-Scan™-guided occlusal adjustment of SS can obtain better OT, DT, and AOF, which furthers improvement of the therapeutic effects on TMD with myofascial pain.
Collapse
Affiliation(s)
- Zhe Li
- Jilin Provincial Key Laboratory of Tooth Development and Bone Remodeling, Hospital of Stomatology, Jilin University, Changchun, P. R. China
| | - Lijun Liu
- Jilin Provincial Key Laboratory of Tooth Development and Bone Remodeling, Hospital of Stomatology, Jilin University, Changchun, P. R. China
| | - Qinzhu Bai
- Department of Radiology, Jilin University Second Hospital, Changchun City, JL, China
| | - Lei Huang
- Jilin Provincial Key Laboratory of Tooth Development and Bone Remodeling, Hospital of Stomatology, Jilin University, Changchun, P. R. China
| | - Baoquan Li
- Department of Temporomandibular Joint, Hospital of Stomatology, Jilin University, Changchun, P. R. China
| | - Liu Yang
- Department of Temporomandibular Joint, Hospital of Stomatology, Jilin University, Changchun, P. R. China
| | - Ting Liang
- Department of Temporomandibular Joint, Hospital of Stomatology, Jilin University, Changchun, P. R. China
| | - Hongchen Sun
- Jilin Provincial Key Laboratory of Tooth Development and Bone Remodeling, Hospital of Stomatology, Jilin University, Changchun, P. R. China
| | - Daowei Li
- Jilin Provincial Key Laboratory of Tooth Development and Bone Remodeling, Hospital of Stomatology, Jilin University, Changchun, P. R. China
- Department of Temporomandibular Joint, Hospital of Stomatology, Jilin University, Changchun, P. R. China
| |
Collapse
|
13
|
Occlusal change in posterior implant-supported single crowns and its association with peri-implant bone level: a 5-year prospective study. Clin Oral Investig 2022; 26:4217-4227. [PMID: 35129663 DOI: 10.1007/s00784-022-04394-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Accepted: 01/17/2022] [Indexed: 11/03/2022]
Abstract
OBJECTIVES This study aims to analyze the 5-year occlusal change in posterior implant-supported single crowns and the association between the relative occlusal force (ROF) and peri-implant bone level. MATERIALS AND METHODS Partially edentulous patients who had received implant-supported single crowns in the posterior region were included. Occlusal examinations with a computerized occlusion analysis system were conducted at 0.5, 3, 6, 12, 24, 36, 48, and 60 months after delivery of the implant-supported single crown. The ROFs of implant-supported single crowns, mesial adjacent teeth, and control natural teeth were recorded. Intraoral periapical radiographs were taken at each follow-up time to evaluate marginal bone level (MBL). Ordinary least square regression was used to analyze the association between ROF and MBL. RESULTS Thirty-seven posterior implant-supported single crowns in 33 participants (23.9 to 70.0 years) were followed up for 0.5 to 60 months [(42.4 ± 26.0) months]. The ROF of implant-supported single crowns increased from 2 weeks to 3 months (P < 0.01) and increased continuously between all two sequential time points from 6 to 36 months, with significant differences (P < 0.05). Then ROFs of implant-supported single crowns were significantly higher than those of control teeth at 48 and 60 months (P < 0.05). Regression analysis showed that ROF was significantly associated with MBL with a coefficient of 0.008 (P < 0.05). CONCLUSION The ROFs of posterior implant-supported single crown have significant change during 5 years' follow-up. The association between ROF and MBL has limited clinical significance. TRIAL REGISTRATION Chinese Clinical Trial Registry: ChiCTR-ROC-17012240. CLINICAL RELEVANCE The occlusion of implant-supported single crowns should be carefully monitored during follow-up examinations, and occlusal adjustment should be considered to prevent overloading.
Collapse
|
14
|
Sako K, Tanaka Y, Tomita Y, Yoshida T, Ono Y, Kashiwagi K. Effect of jaw clenching on head acceleration during a predictable load impact. J Oral Rehabil 2021; 48:1327-1336. [PMID: 34499760 DOI: 10.1111/joor.13254] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2021] [Revised: 08/17/2021] [Accepted: 09/01/2021] [Indexed: 11/30/2022]
Abstract
BACKGROUND Jaw clenching is considered to reduce head acceleration while receiving a strong impact on the body during sport activities. OBJECTIVE The present study aimed to clarify the effect of jaw clenching on reduction of head acceleration during a predictable load impact to the body. METHODS Seven healthy participants were exposed to a predictable load impact with and without jaw clenching. We recorded the electromyographic activity of the masseter (MA) and digastricus (DIG) muscles, occlusal pressure and head acceleration throughout the experiment. RESULTS When participants were not instructed to clench their jaws, they naturally positioned their jaws without occlusal contact at the time of pendulum impact by co-contracting the jaw opener and closer muscles. When participants were instructed to clench their jaws, neither the activity of the jaw opener muscle nor the head acceleration differed at the time of pendulum impact when compared with when participants were not instructed to clench their jaws. CONCLUSIONS A slightly distanced jaw position (co-contracting the jaw opener and closer muscles without occlusal contact) might serve inherently safety for reduction of head acceleration during predictable body impact, while jaw clenching does not contribute to reduction of head acceleration in response to pendulum impact more than the distanced jaw position does. Notably, DIG activation to minimise the head acceleration in response to pendulum impact was similar in clenching and no clenching positions. This suggests that DIG may play a crucial role in the reduction of head acceleration, regardless of MA muscle activity.
Collapse
Affiliation(s)
- Kazuki Sako
- Department of Fixed Prosthodontics and Occlusion, Osaka Dental University, Hirakata, Japan
| | - Yuto Tanaka
- Department of Special Care Dentistry, Osaka Dental University Hospital, Osaka, Japan
| | - Yosuke Tomita
- Department of Physical Therapy, Faculty of Health Care, Takasaki University of Health and Welfare, Takasaki, Japan
| | - Tsuyoshi Yoshida
- Department of Physical Therapy, Faculty of Health Care, Takasaki University of Health and Welfare, Takasaki, Japan
| | - Yoshiaki Ono
- Department of Special Care Dentistry, Osaka Dental University Hospital, Osaka, Japan
| | - Kosuke Kashiwagi
- Department of Fixed Prosthodontics and Occlusion, Osaka Dental University, Hirakata, Japan
| |
Collapse
|
15
|
Wada M, Mameno T, Kani M, Miwa S, Ikebe K. Association between gonial angle on orthopantomogram and reline frequency in removable partial denture wearers. J Prosthodont Res 2021; 66:83-86. [PMID: 34108296 DOI: 10.2186/jpr.jpr_d_20_00153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
PURPOSE Removable dentures are a reasonable option for prosthetic treatment. However, continuous residual ridge resorption and reline procedures are inevitable owing to the strong pressure exerted on the mucosa or inappropriate pressure distribution. This study aimed to elucidate the association between the gonial angle on orthopantomogram (GAO) with occlusal force and reline frequency in removable partial denture wearers. METHODS Participants were patients who had previously received removable partial denture treatment for a free-end defect. Age, sex, number of remaining teeth, remaining opposing teeth, and occlusal support were investigated. GAO was measured using panoramic radiographs. The mean relining interval was calculated as the mean number of days between denture insertion and the first relining or subsequent relining. The association between the mean relining interval and each factor was investigated. RESULTS Sixty-five subjects (33 females) were analyzed. The median value of the mean relining interval was 533.3 days, and the median GAO was 123º. There was a significant positive correlation between the mean relining interval and GAO (rs = 0.335). The number of remaining opposing teeth and occlusal support exhibited weak negative correlations with mean relining interval (rs = -0.187 and -0.214, respectively). Multivariate analysis using a generalized linear model showed that GAO was a significant explanatory variable for the m ean relining interval. CONCLUSIONS Within the limitations of this study, GAO was found GAO was found to contribute to the increased frequency of relining due to ridge resorption in patients with a small GAO.
Collapse
Affiliation(s)
- Masahiro Wada
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, Osaka
| | - Tomoaki Mameno
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, Osaka
| | - Misako Kani
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, Osaka
| | - Shunta Miwa
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, Osaka
| | - Kazunori Ikebe
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, Osaka
| |
Collapse
|
16
|
Tanaka Y, Yoshida T, Ono Y, Maeda Y. The effect of occlusal splints on the mechanical stress on teeth as measured by intraoral sensors. J Oral Sci 2020; 63:41-45. [PMID: 33239484 DOI: 10.2334/josnusd.20-0030] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Abstract
PURPOSE Whether it is possible to prevent mechanical stress on teeth via an occlusal splint remains to be clarified. This study aimed to assess the same by simultaneously recording the occlusal pressure and strain on the teeth in humans. METHODS Eleven participants (five women and six men; mean age 25.7 years) were enrolled in this study. Hard and soft oral appliances were fabricated for the maxillary arch of each participant. The strain on the four target teeth (right maxillary and mandibular first premolars, and first molars) and occlusal pressure were concurrently measured, while the participants performed maximum voluntary teeth clenching under each condition (hard, soft, or no occlusal splint). RESULTS Compared to the absence of an occlusal splint, hard occlusal splints generated less strain on molar teeth but more strain on premolar teeth, while soft occlusal splints did not lower the strain on all target teeth significantly. CONCLUSION Considering the limitations of this study, hard occlusal splints should be used for the protection of molar teeth but for premolar teeth caution is required and depends on the case. On the other hand, soft occlusal splints may not have any benefit for the protection of either type of teeth for patients exhibiting excessive occlusal pressure.
Collapse
Affiliation(s)
- Yuto Tanaka
- Department of Special Care Dentistry, Osaka Dental University Hospital
| | - Toru Yoshida
- Department of Prosthodontics, Gerodontology, and Oral Rehabilitation, Osaka University Graduate School of Dentistry
| | - Yoshiaki Ono
- Department of Special Care Dentistry, Osaka Dental University Hospital
| | - Yoshinobu Maeda
- Department of Prosthodontics, Gerodontology, and Oral Rehabilitation, Osaka University Graduate School of Dentistry
| |
Collapse
|
17
|
Lee W, Kwon HB, Kim MJ, Lim YJ. Determination of the reliability and repeatability of a quantitative occlusal analyzer by using a piezoelectric film sensor: An in vitro study. J Prosthet Dent 2020; 127:331-337. [PMID: 33250197 DOI: 10.1016/j.prosdent.2020.07.024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2019] [Revised: 07/01/2020] [Accepted: 07/01/2020] [Indexed: 10/22/2022]
Abstract
STATEMENT OF PROBLEM A digital quantitative occlusal analyzer with claimed lower cost and easier maneuverability has been introduced to replace conventional methods. However, information regarding its performance is scarce. PURPOSE The purpose of this in vitro study was to evaluate the reliability and repeatability of a newly introduced digital occlusal analysis device (Accura) and to compare it with an established occlusal analyzer (T-scan Novus). MATERIAL AND METHODS The sensor films of both devices were positioned between titanium maxillary and mandibular models that were equilibrated and arbitrarily mounted on a semiadjustable articulator. Compressive force was applied to the upper arm of the articulator with a universal testing machine, increased gradually to 50 N, and then released automatically. The time and force measurements from the universal testing machine and the tested devices were recorded by operating software programs. Five articulating film sensors of each device were tested 3 times each by 2 examiners and were repeated on consecutive days, totaling 60 trials per device. Reliability was defined as an agreement between the loaded force and measured force. Repeatability was defined as an agreement between repeated measurements of the Accura and T-scan Novus. Intraclass correlation coefficient was calculated for the statistical analysis (α=.05). RESULTS The calculated intraclass correlation coefficient of the Accura and the universal testing machine was 0.952. The intraclass correlation coefficient of the T-scan Novus and the universal testing machine was 0.963. Intraclass correlation coefficients that were calculated to compare the data acquired from different days were 0.938 for the Accura and 0.911 for the T-scan Novus. CONCLUSIONS The experimental results indicated that the reliability of both the Accura and T-scan Novus was excellent for measuring occlusal forces. In addition, both the Accura and T-scan Novus exhibited excellent repeatability.
Collapse
Affiliation(s)
- Wonsup Lee
- Graduate student, Department of Prosthodontics, School of Dentistry, Seoul National University, Seoul, Republic of Korea; Clinical Assistant Professor, Department of Prosthodontics, Dental Hospital, St. Mary's Hospital of Catholic University of Korea, Seoul, Republic of Korea
| | - Ho-Beom Kwon
- Professor, Dental Research Institute and Department of Prosthodontics, School of Dentistry, Seoul National University, Seoul, Republic of Korea.
| | - Myung-Joo Kim
- Professor, Dental Research Institute and Department of Prosthodontics, School of Dentistry, Seoul National University, Seoul, Republic of Korea
| | - Young-Jun Lim
- Professor, Dental Research Institute and Department of Prosthodontics, School of Dentistry, Seoul National University, Seoul, Republic of Korea
| |
Collapse
|
18
|
Sivrikaya EC, Guler MS, Bekci ML. A comparative study between zirconia and titanium abutments on the stress distribution in parafunctional loading: A 3D finite element analysis. Technol Health Care 2020; 28:603-613. [PMID: 32568140 DOI: 10.3233/thc-202305] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
BACKGROUND Zirconia has become a popular biomaterial in dental implant systems because of its biocompatible and aesthetic properties. However, this material is more fragile than titanium so its use is limited. OBJECTIVES The aim of this study was to compare the stresses on morse taper implant systems under parafunctional loading in different abutment materials using three-dimensional finite element analysis (3D FEA). METHODS Four different variations were modelled. The models were created according to abutment materials (zirconia or titanium) and loading (1000 MPa vertical or oblique on abutments). The placement of the implants (diameter, 5.0 × 15 mm) were mandibular right first molar. RESULTS In zirconia abutment models, von Mises stress (VMS) values of implants and abutments were decreased. Maximum and minimum principal stresses and VMS values increased in oblique loading. VMS values were highest in the connection level of the conical abutments in all models. CONCLUSIONS Using conical zirconia abutments decreases von Mises stress values in abutments and implants. However, these values may exceed the pathological limits in bruxism patients. Therefore, microfractures may be related to the level of the abutment.
Collapse
Affiliation(s)
- Efe Can Sivrikaya
- Department of Oral Maxillofacial Surgery, Faculty of Dentistry, Karadeniz Technical University, Trabzon, Turkey
| | - Mehmet Sami Guler
- Department of Machinery and Metal Technologies, Vocational School of Technical Sciences, Ordu University, Ordu, Turkey
| | - Muhammed Latif Bekci
- Department of Mechanical Engineering, Faculty of Engineering, Karadeniz Technical University, Trabzon, Turkey
| |
Collapse
|
19
|
Alkan Ö, Kaya Y, Keskin S. Computerized occlusal analysis of Essix and Hawley retainers used during the retention phase: a controlled clinical trial. J Orofac Orthop 2020; 81:371-381. [DOI: 10.1007/s00056-020-00236-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2019] [Accepted: 04/25/2020] [Indexed: 11/28/2022]
|
20
|
Alkan Ö, Kaya Y. Changes in occlusal surface area and occlusal force distribution following the wear of vacuum‐formed, hawley and bonded retainers: A controlled clinical trial. J Oral Rehabil 2020; 47:766-774. [DOI: 10.1111/joor.12970] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2019] [Revised: 03/16/2020] [Accepted: 03/22/2020] [Indexed: 11/29/2022]
Affiliation(s)
- Özer Alkan
- Department of Orthodontics Faculty of Dentistry Ankara Yıldırım Beyazıt University Ankara Turkey
| | - Yeşim Kaya
- Department of Orthodontics Faculty of Dentistry Yüzüncü Yıl University Van Turkey
| |
Collapse
|
21
|
Buduru S, Mesaros A, Talmaceanu D, Baru O, Ghiurca R, Cosgarea R. Occlusion in the digital era: a report on 3 cases. Med Pharm Rep 2020; 92:S78-S84. [PMID: 31989114 PMCID: PMC6978925 DOI: 10.15386/mpr-1524] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Revised: 09/06/2019] [Accepted: 11/04/2019] [Indexed: 11/23/2022] Open
Abstract
In the following case studies we wish to discuss the necessity of making use of digital technology in the occlusion-oriented dental practice. In the three presented cases, patients underwent complex orthodontic, implant and prosthetic treatment, the aim being to re-establish the functionality of the dento-maxillary apparatus. The patients were evaluated clinically at the completion of the treatment. Subsequently, during the follow-ups (which varied between 2 and 4 years), clinical analysis using articulating paper was carried out and possible signs of relapse were specifically searched for. Occlusal clinical analysis was later on compared with the occlusion recorded using the TRIOS® 3 intraoral scanner (3Shape) and the T-Scan™ Novus™ device (TekScan). Clinical and digitally obtained scanner results were similar. The results yielded by the T-Scan™ Novus™ device were different and they were also relevant for elucidating the cause of the symptomatology.
Collapse
Affiliation(s)
- Smaranda Buduru
- Department of Prosthodontics, Iuliu Hatieganu university of Medicine and Pharmacy, Cluj-Napoca, Romania
| | - Anca Mesaros
- Department of Propaedeutics and Dental Aesthetics, Iuliu Hatieganu university of Medicine and Pharmacy, Cluj-Napoca, Romania
| | | | - Oana Baru
- Stomestet Dental Clinic, Cluj-Napoca, Romania
| | | | - Raluca Cosgarea
- Department of Prosthodontics, Iuliu Hatieganu university of Medicine and Pharmacy, Cluj-Napoca, Romania
| |
Collapse
|
22
|
Dias RAB, Rodrigues MJP, Messias AL, Guerra FADA, Manfredini D. Comparison between conventional and computerised methods in the assessment of an occlusal scheme. J Oral Rehabil 2019; 47:221-228. [PMID: 31705804 DOI: 10.1111/joor.12905] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2019] [Revised: 10/14/2019] [Accepted: 10/29/2019] [Indexed: 02/03/2023]
Abstract
PURPOSE In the definition of an occlusal scheme, clinicians should choose between conventional and computerised methods based on a careful appraise of the advantages and limitations. This study aims to assess the correlation between the two approaches in a clinical setting. METHODS Twenty-four patients were included to compare different methods of occlusal contacts assessment on the posterior surfaces of flat mandibular appliances. In supine position, they were asked to clench with maximum strength, in the maximum intercuspation position with a 24 μm articulating paper positioned between the teeth and the appliance surface. An extra-oral photograph of the marks was taken (total N = 2082). They were visually classified based on a pre-defined scale (ie, conventional assessment) and with ImageJ analysis software (ie, photographic software assessment). Additionally, a computerised occlusal analysis was performed (ie, computerised assessment). Correlation analysis of the data achieved with conventional, photographic and computerised assessments was performed. RESULTS Correlation between conventional and computerised assessments was weak (r = .265), whilst it was moderate between conventional and photographic assessments (r = .633), as well as between photographic and computerised assessments (r = .476). CONCLUSIONS This investigation showed a weak-to-moderate correlation between different methods (ie, conventional, photographic and computerised) to assess occlusal marks. None of the three can actually be considered the standard of reference, but based on their specific features, it can bet suggested that the conventional method may be enough for most clinical purposes, unless otherwise proven.
Collapse
Affiliation(s)
- Ricardo António Bernardo Dias
- Dentistry Department, Faculty of Medicine, Institute of Oral Implantology and Prosthodontics, University of Coimbra, Coimbra, Portugal
| | - Maria João Pascoal Rodrigues
- Dentistry Department, Faculty of Medicine, Institute of Occlusion and Orofacial Pain, University of Coimbra, Coimbra, Portugal
| | - Ana Lúcia Messias
- Dentistry Department, Faculty of Medicine, University of Coimbra, Coimbra, Portugal
| | | | | |
Collapse
|
23
|
Ayuso‐Montero R, Mariano‐Hernandez Y, Khoury‐Ribas L, Rovira‐Lastra B, Willaert E, Martinez‐Gomis J. Reliability and Validity of T‐scan and 3D Intraoral Scanning for Measuring the Occlusal Contact Area. J Prosthodont 2019; 29:19-25. [DOI: 10.1111/jopr.13096] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/26/2019] [Indexed: 02/02/2023] Open
Affiliation(s)
- Raul Ayuso‐Montero
- Department of ProsthodonticsSchool of DentistryFaculty of Medicine and Health SciencesUniversity of BarcelonaIDIBELL Spain
- Oral Health and Masticatory System Group(Bellvitge Biomedical Research Institute) IDIBELL L'Hospitalet de Llobregat Barcelona Spain
| | | | - Laura Khoury‐Ribas
- Department of ProsthodonticsSchool of DentistryFaculty of Medicine and Health SciencesUniversity of BarcelonaIDIBELL Spain
- Oral Health and Masticatory System Group(Bellvitge Biomedical Research Institute) IDIBELL L'Hospitalet de Llobregat Barcelona Spain
| | - Bernat Rovira‐Lastra
- Department of ProsthodonticsSchool of DentistryFaculty of Medicine and Health SciencesUniversity of BarcelonaIDIBELL Spain
- Oral Health and Masticatory System Group(Bellvitge Biomedical Research Institute) IDIBELL L'Hospitalet de Llobregat Barcelona Spain
| | - Eva Willaert
- Department of ProsthodonticsSchool of DentistryFaculty of Medicine and Health SciencesUniversity of BarcelonaIDIBELL Spain
- Oral Health and Masticatory System Group(Bellvitge Biomedical Research Institute) IDIBELL L'Hospitalet de Llobregat Barcelona Spain
| | - Jordi Martinez‐Gomis
- Department of ProsthodonticsSchool of DentistryFaculty of Medicine and Health SciencesUniversity of BarcelonaIDIBELL Spain
- Oral Health and Masticatory System Group(Bellvitge Biomedical Research Institute) IDIBELL L'Hospitalet de Llobregat Barcelona Spain
| |
Collapse
|
24
|
Evaluation of the Accuracy of a System to Align Occlusal Dynamic Data on 3D Digital Casts. BIOMED RESEARCH INTERNATIONAL 2018; 2018:8079089. [PMID: 29977917 PMCID: PMC6011109 DOI: 10.1155/2018/8079089] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/06/2018] [Revised: 05/01/2018] [Accepted: 05/10/2018] [Indexed: 11/17/2022]
Abstract
In recent years the T-Scan system has introduced the possibility of importing digitization of dental arches to its registrations. This is a remarkable advance, which allows an intuitive display of the location of the gathered dynamic data on the denture. Nevertheless, today's usual method of manually positioning the arch in relation to the T-Scan's force registration gives rise to the possibility of human error. In order to guarantee a good alignment between the dynamic registration and 3D digital casts, a specific method was developed. The aim of this study is to evaluate the accuracy of this alignment method. For this purpose, it was compared with the most common procedure for detecting occlusal contacts, the articulating paper method. The comparison comprised overlapping digital models of both methods. Contacts of casts of 11 adults were registered, both with articulating paper and the T-Scan system. For one method, articulating paper marks were scanned in color; for the second method, the previously mentioned alignment was carried out with the T-Scan registrations. The results of both methods were overlapped in 3D digital casts, quantifying occlusal data matches. Statistical analyses were made to measure the quality of this alignment method. The study revealed a mean matching percentage of 79.02%, confirming the high reliability of the method.
Collapse
|
25
|
Tang Y, Li H, Chen Y, Zhu L, Kang H. Effect of Different Splint Thicknesses on Occlusal Function and Temporomandibular Joint Sounds: A Clinical Report. ACTA ACUST UNITED AC 2018. [DOI: 10.4236/ojst.2018.812031] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
26
|
Mai HN, Lee KE, Lee KB, Jeong SM, Lee SJ, Lee CH, An SY, Lee DH. Verification of a computer-aided replica technique for evaluating prosthesis adaptation using statistical agreement analysis. J Adv Prosthodont 2017; 9:358-363. [PMID: 29142643 PMCID: PMC5673612 DOI: 10.4047/jap.2017.9.5.358] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2016] [Revised: 02/03/2017] [Accepted: 03/21/2017] [Indexed: 11/08/2022] Open
Abstract
PURPOSE The purpose of this study was to evaluate the reliability of computer-aided replica technique (CART) by calculating its agreement with the replica technique (RT), using statistical agreement analysis. MATERIALS AND METHODS A prepared metal die and a metal crown were fabricated. The gap between the restoration and abutment was replicated using silicone indicator paste (n = 25). Gap measurements differed in the control (RT) and experimental (CART) groups. In the RT group, the silicone replica was manually sectioned, and the marginal and occlusal gaps were measured using a microscope. In the CART group, the gap was digitized using optical scanning and image superimposition, and the gaps were measured using a software program. The agreement between the measurement techniques was evaluated by using the 95% Bland-Altman limits of agreement and concordance correlation coefficients (CCC). The least acceptable CCC was 0.90. RESULTS The RT and CART groups showed linear association, with a strong positive correlation in gap measurements, but without significant differences. The 95% limits of agreement between the paired gap measurements were 3.84% and 7.08% of the mean. The lower 95% confidence limits of CCC were 0.9676 and 0.9188 for the marginal and occlusal gap measurements, respectively, and the values were greater than the allowed limit. CONCLUSION The CART is a reliable digital approach for evaluating the fit accuracy of fixed dental prostheses.
Collapse
Affiliation(s)
- Hang-Nga Mai
- Department of Prosthodontics, School of Dentistry, Kyungpook National University, Daegu, Republic of Korea; and Department of Prosthodontics, National Hospital of Odonto-Stomatology, Hanoi, Vietnam
| | - Kyeong Eun Lee
- Department of Statistics, Kyungpook National University, Daegu, Republic of Korea
| | - Kyu-Bok Lee
- Department of Prosthodontics, School of Dentistry, A3DI, Kyungpook National University, Daegu, Republic of Korea
| | - Seung-Mi Jeong
- Department of Dentistry, Yonsei University Wonju College of Medicine, Wonju, Republic of Korea
| | - Seok-Jae Lee
- Department of Production Engineering, School of Mechanical Engineering, Kyungpook National University, Daegu, Republic of Korea
| | - Cheong-Hee Lee
- Department of Prosthodontics, School of Dentistry, Kyungpook National University, Daegu, Republic of Korea
| | - Seo-Young An
- Department of Oral and Maxillofacial Radiology, School of Dentistry, Kyungpook National University, Daegu, Korea
| | - Du-Hyeong Lee
- Department of Prosthodontics, School of Dentistry, Kyungpook National University, Daegu, Republic of Korea
| |
Collapse
|
27
|
Assessment of occlusion with the T-Scan system in patients undergoing orthognathic surgery. Sci Rep 2017; 7:5356. [PMID: 28706294 PMCID: PMC5509719 DOI: 10.1038/s41598-017-05788-x] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2016] [Accepted: 06/05/2017] [Indexed: 11/13/2022] Open
Abstract
Dental occlusion varies among individuals, and achieving correct physiological occlusion after osteotomy is essential for the complex functioning of the stomatognathic system. The T-Scan system records the centre of force, first contact, maximum bite force, and maximum intercuspation. The aim of the present study was to investigate the usefulness and consistency of T-Scan in assessing occlusion before and after orthognathic surgery. Occlusal information was evaluated for 30 healthy adults with normal occlusion and 40 patients undergoing orthognathic surgery. T-Scan had a high degree of reliability for consecutive measurements (Pearson correlation, r = 0.98). For most parameters, occlusal distribution was better after surgery than before surgery. More teeth contributed to occlusion at maximum intercuspation after surgery than before surgery (14 vs. 10). In addition, the difference in the posterior force distribution was reduced after surgery (17.6 ± 13.8 vs. 22.7 ± 21.4 before surgery), indicating better occlusal force distribution after surgery. The maximum percentage force on teeth (p = 0.004) and the number of teeth contributing to occlusion (p < 0.001) also differed significantly. Thus, T-Scan is good for assessing occlusal discrepancies and can be used to portray the pre- and post-operative occlusal contact distribution during treatment planning and follow-up.
Collapse
|
28
|
Testa M, Di Marco A, Pertusio R, Van Roy P, Cattrysse E, Roatta S. A validation study of a new instrument for low cost bite force measurement. J Electromyogr Kinesiol 2016; 30:243-8. [DOI: 10.1016/j.jelekin.2016.08.005] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2016] [Revised: 08/01/2016] [Accepted: 08/08/2016] [Indexed: 11/30/2022] Open
|
29
|
Cerna M, Ferreira R, Zaror C, Navarro P, Sandoval P. Dr. Manuel Cerna et al.’sReply. Cranio 2016; 34:210-2. [DOI: 10.1080/08869634.2015.1114273] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
30
|
Maurer C, Stief F, Jonas A, Kovac A, Groneberg DA, Meurer A, Ohlendorf D. Influence of the Lower Jaw Position on the Running Pattern. PLoS One 2015; 10:e0135712. [PMID: 26270961 PMCID: PMC4535904 DOI: 10.1371/journal.pone.0135712] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2015] [Accepted: 07/26/2015] [Indexed: 11/26/2022] Open
Abstract
Introduction The effects of manipulated dental occlusion on body posture has been investigated quite often and discussed controversially in the literature. Far less attention has been paid to the influence of dental occlusion position on human movement. If human movement was analysed, it was mostly while walking and not while running. This study was therefore designed to identify the effect of lower jaw positions on running behaviour according to different dental occlusion positions. Methods Twenty healthy young recreational runners (mean age = 33.9±5.8 years) participated in this study. Kinematic data were collected using an eight-camera Vicon motion capture system (VICON Motion Systems, Oxford, UK). Subjects were consecutively prepared with four different dental occlusion conditions in random order and performed five running trials per test condition on a level walkway with their preferred running shoes. Vector based pattern recognition methods, in particular cluster analysis and support vector machines (SVM) were used for movement pattern identification. Results Subjects exhibited unique movement patterns leading to 18 clusters for the 20 subjects. No overall classification of the splint condition could be observed. Within individual subjects different running patterns could be identified for the four splint conditions. The splint conditions lead to a more symmetrical running pattern than the control condition. Discussion The influence of an occlusal splint on running pattern can be confirmed in this study. Wearing a splint increases the symmetry of the running pattern. A more symmetrical running pattern might help to reduce the risk of injuries or help in performance. The change of the movement pattern between the neutral condition and any of the three splint conditions was significant within subjects but not across subjects. Therefore the dental splint has a measureable influence on the running pattern of subjects, however subjects individuality has to be considered when choosing the optimal splint condition for a specific subject.
Collapse
Affiliation(s)
- Christian Maurer
- Move functional, Salzburg, Austria
- Institute of Occupational Medicine, Social Medicine and Environmental Medicine, Goethe University Frankfurt/Main, Frankfurt am Main, Germany
| | - Felix Stief
- Orthopaedic University Hospital Friedrichsheim gGmbH, Frankfurt/Main, Frankfurt am Main, Germany
| | - Alexander Jonas
- Department of Movement and Exercise Science, Institute of Sport Science, Goethe-University Frankfurt/Main, Frankfurt am Main, Germany
| | | | - David Alexander Groneberg
- Institute of Occupational Medicine, Social Medicine and Environmental Medicine, Goethe University Frankfurt/Main, Frankfurt am Main, Germany
| | - Andrea Meurer
- Orthopaedic University Hospital Friedrichsheim gGmbH, Frankfurt/Main, Frankfurt am Main, Germany
| | - Daniela Ohlendorf
- Institute of Occupational Medicine, Social Medicine and Environmental Medicine, Goethe University Frankfurt/Main, Frankfurt am Main, Germany
- * E-mail:
| |
Collapse
|