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Wang H, Chen H, Tian S, Sun Y, Wu F. Quantitative evaluation of the proximal contact area gap change characterization under intercuspal occlusion by intraoral 3D scanning: Food impaction with tight proximal contact. J ESTHET RESTOR DENT 2024. [PMID: 38634200 DOI: 10.1111/jerd.13240] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2024] [Revised: 03/22/2024] [Accepted: 04/10/2024] [Indexed: 04/19/2024]
Abstract
OBJECTIVE This study aimed to present three indicators that represent the proximal contact area gap change under intercuspal occlusion and to see if and how these indicators influence food impaction with tight proximal contact. MATERIALS AND METHODS Ninety volunteers were recruited for bite force measurement and intraoral scanning. Three-dimensional surface data and buccal bite data were obtained for 60 impacted and 60 non-impacted teeth. The scanning data were imported into the Geomagic Studio 2013 to measure three indicators, which included the gap change maximum (Δdm, μm), the buccolingual position of Δdm (P), and the gap expanded buccolingual range (S, mm). The difference between two groups of three indicators and their relationship with food impaction with tight proximal contact were analyzed by the t test, the Pearson chi-squared test, the nonparametric Mann-Whitney U test, and the binary logistic regression analysis (a = 0.05). RESULTS All indicators (Δdm, P, and S) were statistically different (p < 0.001, p = 0.002, and p < 0.001) in the impacted and non-impacted groups. Food impaction with tight proximal contact was affected by Δdm and S (p < 0.001, p = 0.039), but not by P (p = 0.409). CONCLUSION The excessive increase of the gap change maximum and the gap expanded buccolingual range under bite force promoted the occurrence of food impaction with tight proximal contact. CLINICAL SIGNIFICANCE The use of intraoral scanning to measure the characteristics of the proximal contact area gap change under bite force may help to deepen our understanding of the pathogenesis of food impaction with tight proximal contact. Importantly it can provide a reference basis for individualizing and quantifying occlusal adjustment treatment.
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Affiliation(s)
- Hongyan Wang
- Department of Prosthodontics, Shanxi Medical University School and Hospital of Stomatology, Taiyuan, People's Republic of China
| | - Hu Chen
- Center of Digital Dentistry, Faculty of Prosthodontics, Peking University School and Hospital of Stomatology, National Center for Stomatology, National Clinical Research Center for Oral Diseases, National Engineering Research Center of Oral Biomaterials and Digital Medical Devices, NHC Key Laboratory of Digital Stomatology, Beijing Key Laboratory of Digital Stomatology, Key Laboratory of Digital Stomatology, Chinese Academy of Medical Sciences, Beijing, People's Republic of China
| | - Sukun Tian
- Center of Digital Dentistry, Faculty of Prosthodontics, Peking University School and Hospital of Stomatology, National Center for Stomatology, National Clinical Research Center for Oral Diseases, National Engineering Research Center of Oral Biomaterials and Digital Medical Devices, NHC Key Laboratory of Digital Stomatology, Beijing Key Laboratory of Digital Stomatology, Key Laboratory of Digital Stomatology, Chinese Academy of Medical Sciences, Beijing, People's Republic of China
| | - Yuchun Sun
- Center of Digital Dentistry, Faculty of Prosthodontics, Peking University School and Hospital of Stomatology, National Center for Stomatology, National Clinical Research Center for Oral Diseases, National Engineering Research Center of Oral Biomaterials and Digital Medical Devices, NHC Key Laboratory of Digital Stomatology, Beijing Key Laboratory of Digital Stomatology, Key Laboratory of Digital Stomatology, Chinese Academy of Medical Sciences, Beijing, People's Republic of China
| | - Feng Wu
- Department of Prosthodontics, Shanxi Medical University School and Hospital of Stomatology, Taiyuan, People's Republic of China
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Karl E, Siddanna GD, Mantesso A. Preclinical assessment of Class IV proximal contacts following different teaching strategies. Eur J Dent Educ 2022; 26:409-415. [PMID: 34520607 DOI: 10.1111/eje.12717] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Revised: 03/01/2021] [Accepted: 09/01/2021] [Indexed: 06/13/2023]
Abstract
INTRODUCTION Class IV composite restorations are one of the biggest challenges in dentistry. Furthermore, replacing adequate proximal contours on Class IV restorations is crucial for the function and aesthetics. The objective of this study is to assess four different teaching strategies used to improve first-year dental students' Class IV restoration proximal contact performance over a period of 4 years. MATERIALS AND METHODS We assessed four cohorts of first-year dental students who were exposed to four different teaching strategies during the first-year preclinical training over two consecutive academic terms. The four different teaching strategies used were: (a) two waxing exercises (control cohort, strategy 1); (b) digital dentistry and four waxing exercises (strategy 2); (c) four waxing exercises (strategy 3); and (d) four waxing exercises and live demonstrations (strategy 4). All cohorts were exposed to the same didactic lecture of Class IV restorations. RESULTS Our results showed that all teaching strategies resulted in better student's performance and content retention compared to the control cohort. However, the teaching strategy that resulted in the best pass/fail ratio was the association of waxing exercises with live demonstrations (strategy 4). DISCUSSION Increasing the number of waxing exercises may improve students' performance either alone or associated with different teaching strategies. However, when associated with live demonstrations, waxing exercises have significantly reduced critical errors. CONCLUSIONS Our study demonstrated for the first time the benefits of the affordable and traditional waxing exercises associated with instructor demonstrations as a teaching strategy for first-year dental students.
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Affiliation(s)
- Elisabeta Karl
- Department of Cariology, Restorative Sciences, and Endodontics, University of Michigan School of Dentistry, Ann Arbor, MI, USA
| | - Geetha Duddanahalli Siddanna
- Department of Cariology, Restorative Sciences, and Endodontics, University of Michigan School of Dentistry, Ann Arbor, MI, USA
| | - Andrea Mantesso
- Department of Cariology, Restorative Sciences, and Endodontics, University of Michigan School of Dentistry, Ann Arbor, MI, USA
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Li L, Chen H, Wang Y, Sun Y. Construction of virtual intercuspal occlusion: Considering tooth displacement. J Oral Rehabil 2021; 48:701-710. [PMID: 33486815 DOI: 10.1111/joor.13153] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2020] [Revised: 11/30/2020] [Accepted: 01/14/2021] [Indexed: 11/29/2022]
Abstract
Common impressions cannot accurately duplicate the dental occlusion under occlusal force due to tooth displacement and mandibular deformation. To establish new methods to construct virtual intercuspal occlusion and assess their construction accuracy. The intraoral occlusal contacts of posterior teeth of 15 subjects were recorded with 8 μm and 100 μm articulating paper, respectively, and the marked teeth and buccal bite data were scanned with an intraoral scanner. The virtual dental occlusions were separately determined by buccal bite registration (BBR) method, and 3 new methods, namely segmented tooth registration (STR), occlusal contact areas (marked by 8 μm articulating paper) registration (OCR) and mixing registration (MR) methods. With the intraoral contact areas marked by 100 μm articulating paper set as reference and contact areas of the 4 virtual occlusions as tests, sensitivity, positive predictive value (PPV) and the ratio of overlapping areas were calculated. Kruskal-Wallis test or 1-way ANOVA was used to analyse the difference among groups. The sensitivity ranged from 0.69 to 0.94 and the PPV from 0.67 to 0.90. Sensitivity of OCR group and PPV of STR and OCR groups were different from that of BBR group at overlapping threshold of 50% (P = .028, .028 and .006). There was statistical difference of the ratio of overlapping areas over reference areas, and the values of STR and OCR groups were higher than that of BBR group (P = .045 and .021). The ability of STR and OCR methods to construct virtual intercuspal occlusion was better than BBR method.
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Affiliation(s)
- Linlin Li
- Faculty of Prosthodontics, Center of Digital Dentistry, Peking University School and Hospital of Stomatology & National Engineering Laboratory for Digital and Material Technology of Stomatology & Research Center of Engineering and Technology for Digital Dentistry of Ministry of Health & Beijing Key Laboratory of Digital Stomatology & National Clinical Research Center for Oral Diseases, Beijing, China
| | - Hu Chen
- Faculty of Prosthodontics, Center of Digital Dentistry, Peking University School and Hospital of Stomatology & National Engineering Laboratory for Digital and Material Technology of Stomatology & Research Center of Engineering and Technology for Digital Dentistry of Ministry of Health & Beijing Key Laboratory of Digital Stomatology & National Clinical Research Center for Oral Diseases, Beijing, China
| | - Yong Wang
- Faculty of Prosthodontics, Center of Digital Dentistry, Peking University School and Hospital of Stomatology & National Engineering Laboratory for Digital and Material Technology of Stomatology & Research Center of Engineering and Technology for Digital Dentistry of Ministry of Health & Beijing Key Laboratory of Digital Stomatology & National Clinical Research Center for Oral Diseases, Beijing, China
| | - Yuchun Sun
- Faculty of Prosthodontics, Center of Digital Dentistry, Peking University School and Hospital of Stomatology & National Engineering Laboratory for Digital and Material Technology of Stomatology & Research Center of Engineering and Technology for Digital Dentistry of Ministry of Health & Beijing Key Laboratory of Digital Stomatology & National Clinical Research Center for Oral Diseases, Beijing, China
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Bompolaki D, Edmondson SA, Katancik JA. Interproximal contact loss between implant-supported restorations and adjacent natural teeth: A retrospective cross-sectional study of 83 restorations with an up to 10-year follow-up. J Prosthet Dent 2020; 127:418-424. [PMID: 33342612 DOI: 10.1016/j.prosdent.2020.09.034] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2020] [Revised: 09/14/2020] [Accepted: 09/14/2020] [Indexed: 10/22/2022]
Abstract
STATEMENT OF PROBLEM Interproximal contact loss between implant-supported restorations and adjacent natural teeth is a frequently encountered complication that could negatively affect surrounding tissues and/or patient satisfaction with treatment. The effect of interproximal contact loss on peri-implant tissue health and patient awareness of food impaction is currently unknown. PURPOSE The purpose of this retrospective cross-sectional study was to explore the effect of interproximal contact loss on peri-implant tissue health and determine whether interproximal contact loss leads to increased patient awareness of food impaction around the affected area. This study also aimed to identify whether specific patient or local factors could cause interproximal contact loss. MATERIAL AND METHODS Eighty-three participants with posterior single-unit implant-supported restorations were examined. The mean follow-up time after prosthesis insertion was 4 ±2.2 years (range 4 months to 10.6 years). Interproximal contacts were evaluated by using waxed dental floss. Patient age, sex, implant location, opposing tooth status, presence of endodontically treated adjacent tooth, and regular use of an occlusal device at night were recorded. Peri-implant probing depths and the presence of bleeding on probing were also recorded. Each participant was asked to indicate whether they had noticed increased food impaction around their implant-supported restoration. Statistical analysis included nonparametric Mann-Whitney U tests, the Spearman rank-order correlation, the Pearson chi-squared tests, and the paired t test (α=.05). RESULTS Among all examined mesial contacts, 34.1% were recorded as open, with an overall mesial interproximal contact loss (open and loose contacts combined) incidence of 48.8%. Restorations placed in premolar sites exhibited significantly tighter mesial interproximal contacts compared with those placed in molar sites (U=566, P=.041). A significant negative correlation was found between follow-up time after insertion and mesial contact tightness (rs=-0.226, P=.041). CONCLUSIONS Interproximal contact loss appears to increase over time, with more surfaces being affected after longer periods of service. This study did not find an association between interproximal contact loss and peri-implant inflammation as measured by bleeding on probing, with the exception of the distolingual implant surface. Participants with interproximal contact loss were more aware of food impaction around their implant crown. Use of an occlusal device at night did not prevent interproximal contact loss.
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Affiliation(s)
- Despoina Bompolaki
- Associate Professor, Department of Restorative Dentistry, Oregon Health & Science University, Portland, Ore.
| | - Sara A Edmondson
- Resident, Graduate Orthodontics Program, The University of Tennessee Health Science Center, Memphis, Tenn
| | - James A Katancik
- Professor and Chair, Department of Periodontology, Oregon Health & Science University, Portland, Ore
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Liang C, Nien C, Chen Y, Hsu K. The prevalence and associated factors of proximal contact loss between implant restoration and adjacent tooth after function: A retrospective study. Clin Implant Dent Relat Res 2020; 22:351-358. [PMID: 32419242 DOI: 10.1111/cid.12918] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2018] [Revised: 04/15/2020] [Accepted: 04/18/2020] [Indexed: 11/26/2022]
Affiliation(s)
- Chao‐Hua Liang
- Department of Prosthodontics Chang Gung Memorial Hospital Taoyuan City, Taiwan Republic of China
| | - Chung‐Yi Nien
- Department of Life Sciences National Central University Taoyuan City, Taiwan Republic of China
| | - Yu‐Ling Chen
- Center for Big Data Analytics and Statistics Chang Gung Memorial Hospital Taoyuan City, Taiwan Republic of China
| | - Kuang‐Wei Hsu
- Department of Prosthodontics Chang Gung Memorial Hospital Taoyuan City, Taiwan Republic of China
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Almalki AD, Al-Rafee MA. Evaluation of presence of proximal contacts on recently inserted posterior crowns in different health sectors in Riyadh City, Saudi Arabia. J Family Med Prim Care 2019; 8:3549-3553. [PMID: 31803650 PMCID: PMC6881967 DOI: 10.4103/jfmpc.jfmpc_735_19] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2019] [Revised: 09/17/2019] [Accepted: 09/25/2019] [Indexed: 11/04/2022] Open
Abstract
Background For the successful outcome of the rehabilitation of the teeth with crown, the proximal contact points play a significant role hence the aim of the present study was to evaluate the presence of proximal contacts on recently inserted crowns in posterior teeth. Methods and Materials The cross-sectional study was conducted on recently inserted posterior crowns. Clinical assessment of proximal contact points on crowns was made with dental floss, the floss was wrapped around the index fingers of both hands and was passed through the crowns mesial and distal contact points and was categorized as acceptable, open contact points, and tight contact points. Results In the present study 401 crowns were examined to assess proximal contacts on 788 proximal surfaces. It was found that 522 (66.2%) crowns were in normal proximal contact, 144 (18.3%) showed open proximal contacts, 122 (15.5%) showed tight proximal contacts. Conclusion Regarding the assessment of proximal contacts, the study showed that a significant number of crowns had open or tight proximal contacts. Specialists and residents were able to perform better in providing the optimum proximal contacts.
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Affiliation(s)
- Ahmad D Almalki
- Department of Prosthodontics, College of Dentistry, Riyadh Elm University, Riyadh, Saudi Arabia
| | - Mohammad A Al-Rafee
- Department of Prosthodontics, College of Dentistry, Riyadh Elm University, Riyadh, Saudi Arabia
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Ei TZ, Shimada Y, Abdou A, Sadr A, Yoshiyama M, Sumi Y, Tagami J. Three-dimensional assessment of proximal contact enamel using optical coherence tomography. Dent Mater 2019; 35:e74-e82. [DOI: 10.1016/j.dental.2019.01.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2018] [Revised: 11/27/2018] [Accepted: 01/11/2019] [Indexed: 11/15/2022]
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Pang NS, Suh CS, Kim KD, Park W, Jung BY. Prevalence of proximal contact loss between implant-supported fixed prostheses and adjacent natural teeth and its associated factors: a 7-year prospective study. Clin Oral Implants Res 2017; 28:1501-1508. [DOI: 10.1111/clr.13018] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/02/2017] [Indexed: 11/28/2022]
Affiliation(s)
- Nan-Sim Pang
- Department of Advanced General Dentistry; College of Dentistry; Yonsei University; Seoul Korea
| | - Chang-Sup Suh
- Department of Advanced General Dentistry; College of Dentistry; Yonsei University; Seoul Korea
| | - Kee-Deog Kim
- Department of Advanced General Dentistry; College of Dentistry; Yonsei University; Seoul Korea
| | - Wonse Park
- Department of Advanced General Dentistry; College of Dentistry; Yonsei University; Seoul Korea
| | - Bock-Young Jung
- Department of Advanced General Dentistry; College of Dentistry; Yonsei University; Seoul Korea
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Al Qassar SSS, Mavragani M, Psarras V, Halazonetis DJ. The anterior component of occlusal force revisited: direct measurement and theoretical considerations. Eur J Orthod 2016; 38:190-6. [PMID: 25888533 PMCID: PMC4914761 DOI: 10.1093/ejo/cjv028] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
BACKGROUND The anterior component of occlusal force (ACF), considered to result from the mesial inclination of teeth relative to the occlusal plane, has been estimated by indirectly measuring contact point tightness (CPT) through interproximal insertion of metal strips. ACF has been observed concurrently with a posterior component, whose theoretical origin is difficult to explain. OBJECTIVES Evaluate ACF by measuring CPT directly, and integrate current data to propose a theoretical basis for ACF. MATERIALS AND METHODS The sample comprised 14 females (age: 22.3±2.8) and 16 males (age: 20.8±2.5). Our device consisted of two force sensors: one for measuring maximum bite force (MBF) (overall thickness: 4mm), and one for measuring CPT directly (0.2mm thick), inserted between the lower first molar and second premolar. ACF was computed as the difference in CPT between the biting (at 75 per cent of MBF) and non-biting conditions. RESULTS Averages of MBF, CPT, and ACF were 666.67 [standard deviation (SD): 36.06], 6.74 (SD: 1.17), and 20.59 (SD: 4.60) N, respectively. ACF, CPT, and MBF were higher in males by approximately 28, 18 and 7 per cent, respectively. A positive correlation was observed between ACF and MBF (R (2): 0.64). CPT was also significantly correlated to MBF (R (2): 0.40). Biomechanical analysis indicates that previously offered explanations do not unriddle the concurrent increase of CPT at anterior and posterior contact points. CONCLUSIONS ACF was related to bite force by a logarithmic model. We speculate that CPT increases during biting through a combination of mesial tipping of teeth and mandibular bending.
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Affiliation(s)
| | | | - Vasilis Psarras
- **Department of Stomatognathic Physiology, School of Dentistry, National and Kapodistrian University of Athens, Greece
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Ren S, Lin Y, Hu X, Wang Y. Changes in proximal contact tightness between fixed implant prostheses and adjacent teeth: A 1-year prospective study. J Prosthet Dent 2016; 115:437-40. [DOI: 10.1016/j.prosdent.2015.08.018] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2015] [Revised: 08/27/2015] [Accepted: 08/28/2015] [Indexed: 11/28/2022]
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Gomes IA, Filho EMM, Mariz DCBR, Borges AH, Tonetto MR, Firoozmand LM, Kuga CM, De Jesus RRT, Bandéca MC. In vivo Evaluation of Proximal Resin Composite Restorations performed using Three Different Matrix Systems. J Contemp Dent Pract 2015; 16:643-647. [PMID: 26423500 DOI: 10.5005/jp-journals-10024-1735] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
OBJECTIVE The aim of this in vivo study was to radiographically evaluate the proximal contour of composite resin restorations performed using different matrix systems. MATERIALS AND METHODS Patients with premolars needing class II type resin composite restorations involving the marginal ridge were selected. Thirty premolars were selected and randomly divided into three groups (n = 10 each) to receive restorations using different matrix systems: group 1: metal matrix coupled to a carrier matrix and wood wedge (G1-MMW); group 2: sectioned and precontoured metal matrix and elastic wedge (G2-SME); and group 3: a polyester strip and reflective wedge (G3-PMR). After the restorative procedure, bitewing radiographs were performed and analyzed by three calibrated professionals. The quality of the proximal contact and marginal adaptation of the proximal surfaces was classified as either correct or incorrect (undercontour/overcontour). RESULTS The Pearson Chi-square statistical test (α = 5%) revealed a statistically difference between frequencies of correct and incorrect restorations (α(2) = 6.787, p < 0.05). The group G2 SME produced a higher frequency of correct proximal contours (90%), while G1-MMW and G3-PMR had a ratio of 40% correct and 60% incorrect contours respectively. CONCLUSION None of the matrix systems was able to prevent the formation of incorrect proximal contours; however, the sectioned and precontoured metal matrix/elastic wedge configuration provided better results as compared to the other groups.
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Affiliation(s)
| | | | | | - Alvaro Henrique Borges
- Department of Postgraduate in Integrated Dental Science University of Cuiaba, Cuiaba, MT, Brazil
| | - Mateus Rodrigues Tonetto
- Department of Postgraduate in Integrated Dental Science University of Cuiaba, Cuiaba, MT, Brazil
| | | | - Carlos Milton Kuga
- Department of Restorative Dentistry, Araraquara Dental School, Univ Estadual Paulista, Araraquara, Sao Paulo, Brazil
| | | | - Matheus Coelho Bandéca
- Professor, Department of Postgraduate in Dentistry, CEUMA University, Sao Luis, MA, University Rua Jossue Montello, 01, Sao Luis, MA, Brazil, e-mail:
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CHANG WENJEN, CHANG YENHSIANG, WANG HSUAN, LIN CHUNLI. COMPARISON OF PROXIMAL IN VITRO TOOTH CONTACTS IN CLASS II RESTORATIONS WITH DIFFERENT RESTORATIVE MATERIALS AND CAVITY SIZES USING A NEW MEASUREMENT DEVICE. J MECH MED BIOL 2015. [DOI: 10.1142/s0219519415500578] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
This study used a newly developed proximal contact strength (PCS) device to evaluate the tightness of proximal tooth contact for Class II cavity size restoration with different materials using an auxiliary separation ring system. A measurement device based on the equilibrium of forces acted on the clamp rod converts a pull-out force between interdental spaces on a force sensing resistor to express the PCS. This device was designed using dental floss as the test end and can be moved with constant speed during measurement through a bevel gear that transforms the rotation of motor shaft into linear movement of clamp rod. A manikin model was used with 60 artificial first molars in which an mesial occlusal (MO) preparation was ground. Samples were divided into six groups (each n = 10) for simulating amalgam and resin composite restoration with three different cavity sizes. The different cavities were defined using the ratio of the actual isthmus width to the intercuspal width (W) to 1/3, 2/3 and 1. The PCS value in each sample was measured after restoration. The result showed that the mean PCS value and standard deviation were 2283.1 ± 216.5 gf, 2419.1 ± 375 gf and 1737.6 ± 372.7 g for 1/3 W, 2/3 W and W cavities of the amalgam restoration, respectively. The corresponding PCS values were 1178.0 ± 230.4 gf, 1205.8 ± 249.1 gf and 1247.0 ± 157.5 gf for 1/3 W, 2/3 W and W cavities of the resin composite restoration. PCS values with amalgam restoration were larger than those for resin composite restorations under the same cavity size. Large cavity (W) PCS might be lost with amalgam restoration. No significant difference was found in resin composite restoration PCS among the different cavity sizes.
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Affiliation(s)
- WEN-JEN CHANG
- Department of Information Management, Chang Gung University, 259 Wen-Hua 1st Road, Kwei-Shan, Tao-Yuan 333, Taiwan
| | - YEN-HSIANG CHANG
- Department of General Dentistry, Chang Gung Memorial Hospital, 123, Ding-Hu Road, Kuei-Shan, Tao-Yuan 333, Taiwan
| | - HSUAN WANG
- Department of Biomedical Engineering, National Yang-Ming University, 2 No.155, Sec. 2, Linong Street, Taipei 112, Taiwan
| | - CHUN-LI LIN
- Department of Biomedical Engineering, National Yang-Ming University, 2 No.155, Sec. 2, Linong Street, Taipei 112, Taiwan
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Kataoka K, Ekuni D, Mizutani S, Tomofuji T, Azuma T, Yamane M, Kawabata Y, Iwasaki Y, Morita M. Association Between Self-Reported Bruxism and Malocclusion in University Students: A Cross-Sectional Study. J Epidemiol 2015; 25:423-30. [PMID: 25865057 PMCID: PMC4444496 DOI: 10.2188/jea.je20140180] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2014] [Accepted: 01/07/2015] [Indexed: 12/21/2022] Open
Abstract
OBJECTIVES Bruxism can result in temporomandibular disorders, oral pain, and tooth wear. However, it is unclear whether bruxism affects malocclusion. The aim of this study was to examine the association between self-reported bruxism and malocclusion in university students. METHODS Students (n = 1503; 896 men and 607 women) aged 18 and 19 years were examined. Malocclusion was defined using a modified version of the Index of Orthodontic Treatment Need. The presence of buccal mucosa ridging, tooth wear, dental impression on the tongue, palatal/mandibular torus, and the number of teeth present were recorded, as well as body mass index (BMI). Additional information regarding gender, awareness of bruxism, orthodontic treatment, and oral habits was collected via questionnaire. RESULTS The proportion of students with malocclusion was 32% (n = 481). The awareness of clenching in males with malocclusion was significantly higher than in those with normal occlusion (chi square test, P < 0.01). According to logistic regression analysis, the probability of malocclusion was significantly associated with awareness of clenching (odds ratio [OR] 2.19; 95% confidence interval [CI], 1.22-3.93) and underweight (BMI <18.5 kg/m(2)) (OR 1.89; 95% CI, 1.31-2.71) in males but not in females. In subgroup analyses, the probability of crowding was also significantly associated with awareness of clenching and underweight (P < 0.01) in males. CONCLUSIONS Awareness of clenching and underweight were related to malocclusion (crowding) in university male students.
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Affiliation(s)
- Sorin T. Teich
- Case Western Reserve University School of Dental Medicine
| | - Jay Joseph
- Department of Comprehensive Care; Case Western Reserve University School of Dental Medicine
| | - Neimar Sartori
- Division of Restorative Sciences; University of Southern California Ostrow School of Dentistry
| | - Masahiro Heima
- Department of Pediatric Dentistry; Case Western Reserve University School of Dental Medicine
| | - Sillas Duarte
- Division of Restorative Sciences; University of Southern California Ostrow School of Dentistry
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Wong ATY, Wat PYP, Pow EHN, Leung KCM. Proximal contact loss between implant-supported prostheses and adjacent natural teeth: a retrospective study. Clin Oral Implants Res 2014; 26:e68-71. [DOI: 10.1111/clr.12353] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Anita T. Y. Wong
- Oral Rehabilitation; Faculty of Dentistry; University of Hong Kong; Hong Kong SAR China
| | - Peter Y. P. Wat
- Oral Rehabilitation; Faculty of Dentistry; University of Hong Kong; Hong Kong SAR China
| | - Edmond H. N. Pow
- Oral Rehabilitation; Faculty of Dentistry; University of Hong Kong; Hong Kong SAR China
| | - Katherine C. M. Leung
- Oral Rehabilitation; Faculty of Dentistry; University of Hong Kong; Hong Kong SAR China
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Tsuchiya S, Tsuchiya M, Nishioka T, Suzuki O, Sasano Y, Igarashi K. Physiological distal drift in rat molars contributes to acellular cementum formation. Anat Rec (Hoboken) 2013; 296:1255-63. [PMID: 23775928 DOI: 10.1002/ar.22731] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2012] [Accepted: 04/15/2013] [Indexed: 12/15/2022]
Abstract
Occlusal forces may induce the physiological teeth migration in humans, but there is little direct evidence. Rat molars are known to migrate distally during aging, possibly caused by occlusal forces. The purpose of this study was to determine if a reduction in occlusion would decrease teeth migration and affect associated periodontal structures such as cementum. To reduce occlusal forces, the right upper first molar (M1) in juvenile rats was extracted. The transition of the position of upper second molar (M2) and formation of M2 cementum was followed during aging. From the cephalometric analyses, upper M2 was located more anterior compared with the original position with aging after M1 extraction. Associated with this "slowing-down" of the physiological drift, cementum thickness on distal surface, but not on mesial surface, of M2 root was significantly increased. The accumulation of alizarin red as vital stain indicative of calcification, was observed in the distal cementum of M2 root only on the side of M1 extraction. Extraction of M1 that results in less functional loading, distinctly attenuates the physiological drift only in the upper dentition. The decreased physiological drift appears to activate acellular cementum formation only on distal surface of M2 root, perhaps due to reduced mechanical stress associated with the attenuated distal drift. In conclusion, the physiological distal drift in rat molars appears to be largely driven by the occlusal force and also affects the formation of acellular cementum. These findings provide additional direct evidence for an important role of occlusal forces in tooth migration.
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Affiliation(s)
- Shinobu Tsuchiya
- Division of Oral Dysfunction Science, Tohoku University Graduate School of Dentistry, Sendai, Japan
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Sarig R, Lianopoulos NV, Hershkovitz I, Vardimon AD. The arrangement of the interproximal interfaces in the human permanent dentition. Clin Oral Investig 2012; 17:731-8. [DOI: 10.1007/s00784-012-0759-4] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2011] [Accepted: 05/15/2012] [Indexed: 11/24/2022]
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Oh SH, Nakano M, Bando E, Keisuke N, Shigemoto S, Jeong JH, Kang DW. Relationship between occlusal tooth contact patterns and tightness of proximal tooth contact. J Oral Rehabil 2006; 33:749-53. [PMID: 16938103 DOI: 10.1111/j.1365-2842.2006.01635.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
The aim of this study was to investigate the relationship between occlusal tooth contact patterns and the tightness of proximal tooth contact (TPTC) during clenching. Twenty young adult volunteers with healthy dentition participated in the study. TPTC between the left second premolar (P2) and the first molar (M1) was measured during clenching at the 50% maximum voluntary contraction level in the intercuspal position (ICP). A silicone impression material was used to make an interocclusal record at the ICP in each subject, and interocclusal records were analysed using an image-processing system. Subjects were classified according to the presence or absence of each type (A, B or C) of occlusal contact. Statistical analysis was performed using the Mann-Whitney U-test. The results of this study exhibited a relationship between B-type contact and the TPTC of maxillary teeth. The experimental group with a lack of B-type contact on maxillary P2 and/or M1 showed a statistically greater TPTC than the group with B-type contact on both of these teeth (P < 0.01). These results suggest that occlusal tooth contact patterns have an influence on TPTC during clenching.
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Affiliation(s)
- S-H Oh
- Department of Prosthodontics, College of Dentistry, Chosun University, Gwangju, Republic of Korea.
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