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Gill T, Kühl S, Rawlinson S, Pippenger B, Bellon B, Shahdad S. Primary stability and osseointegration comparing a novel tapered design tissue-level implant with a parallel design tissue-level implant. An experimental in vivo study. Clin Oral Implants Res 2024. [PMID: 38819108 DOI: 10.1111/clr.14301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2024] [Revised: 05/07/2024] [Accepted: 05/13/2024] [Indexed: 06/01/2024]
Abstract
OBJECTIVES The aim of the present study was to compare a novel tapered, double-threaded self-tapping tissue-Level design implant (TLC) to a well-established parallel walled tissue-level (TL) implant in terms of primary and secondary stability over time. MATERIALS AND METHODS Test TLC (n = 10/per timepoint) and control TL (n = 10/per timepoint) implants were placed in the mandible of minipigs and left for submerged healing for 3, 6, and 12 weeks. Maximum insertion torque and implant stability quotient (ISQ) were measured for each implant at placement. Osseointegration and cortical bone maintenance were histologically evaluated by measuring total bone-to-implant contact (BIC) and first bone-to-implant contact (fBIC). RESULTS A significantly higher maximum insertion torque was measured for the test implant TLC compared to the control TL implant (57.83 ± 24.73 Ncm and 22.62 ± 23.16 Ncm, respectively; p < .001). The mean ISQ values were comparable between the two implant types (75.00 ± 6.70 for TL compared to 75.40 ± 3.20 for TLC, p = .988). BIC was comparable between both implant types at each of the evaluated time points. The fBIC was found to be significantly more coronal at 12 weeks for the TLC implant compared to the TL implant (0.31 ± 0.83 mm for TLC compared to -0.22 ± 0.85 for TL, p = .027). CONCLUSION The novel tapered tissue level design implant showed improved primary stability and an overall improved crestal bone height maintenance compared to the parallel walled design at 12 weeks.
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Affiliation(s)
- Thomas Gill
- Institute of Dentistry, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, UK
| | - Sebastian Kühl
- Department of Oral Surgery, University Center for Dental Medicine, University of Basel, Basel, Switzerland
| | - Simon Rawlinson
- Institute of Dentistry, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, UK
| | - Benjamin Pippenger
- Department of Periodontology, School of Dental Medicine, University of Bern, Bern, Switzerland
- Department of Preclinical Research, Institut Straumann AG, Basel, Switzerland
| | - Benjamin Bellon
- Department of Preclinical Research, Institut Straumann AG, Basel, Switzerland
- Faculty of Medicine and Health Technology, University of Tampere, Tampere, Finland
| | - Shakeel Shahdad
- Institute of Dentistry, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, UK
- Department of Restorative Dentistry, the Royal London Dental Hospital, Barts Health NHS Trust, London, UK
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Liu Q, Liu Y, Chen D, Wu X, Huang R, Liu R, Chen Z, Chen Z. Placement accuracy and primary stability of implants in the esthetic zone using dynamic and static computer-assisted navigation: A retrospective case-control study. J Prosthet Dent 2024; 131:427-435. [PMID: 36473750 DOI: 10.1016/j.prosdent.2022.11.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2022] [Revised: 11/02/2022] [Accepted: 11/02/2022] [Indexed: 12/12/2022]
Abstract
STATEMENT OF PROBLEM Both the placement accuracy and primary stability of implants are important to implant therapy in the esthetic zone. The effect of dynamic and static computer-assisted navigation on the primary stability of implants in the esthetic zone remains uncertain. PURPOSE The purpose of this case-control study was to investigate the effect of dynamic and static computer-assisted navigation on the placement accuracy and primary stability of implants in the esthetic zone. MATERIAL AND METHODS Partially edentulous participants who received at least 1 implant in the anterior maxilla using either fully guided static or dynamic computer-assisted implant surgery (s-CAIS, d-CAIS) from January 2020 to February 2022 were screened. Participant demographic information, timing of implant placement, primary stability represented by the insertion torque value (ITV) in Ncm, and implant survival were collected from the treatment record. Bone quality at the implant sites was determined according to the Lekholm and Zarb classification. The accuracy of implant placement represented by the linear (platform: Dpl, mm; apex: Dap, mm) and angular deviations (axis: Dan, degree) between the planned and placed implants was evaluated based on the preoperative surgical plan and postoperative cone beam computed tomography (CBCT) data. A statistical analysis of the data was completed by using the chi-squared, Fisher exact, Student t, and Mann-Whitney U tests (α=.05). RESULTS A total of 32 study participants (38 implants) were included. The groups of s-CAIS (16 participants, 18 implants) and d-CAIS (16 participants, 20 implants) were statistically comparable in sex (P=.072), age (P=.548), bone quality (P=.671), and timing of implant placement (P=.719). All implants survived during an average follow-up period of 13 months. The d-CAIS group showed close linear deviations (Dpl 1.07 ±0.57 mm, Dap 1.26 ±0.53 mm) but lower angular deviation (Dan 2.14 ±1.20 degrees) and primary stability (ITV 25.25 ±7.52 Ncm) than the s-CAIS group (Dpl 0.92 ±0.46 mm, Dap 1.31 ±0.43 mm, Dan 3.31 ±1.61 degrees, ITV 30.56 ±11.23 Ncm, PDpl=.613, PDap=.743, PDan=.016, PITV=.028). CONCLUSIONS Comparable linear positioning accuracy and higher angular deviation were found for implants placed in the esthetic zone by using s-CAIS than when using d-CAIS. Higher primary stability of implants may be achieved by using s-CAIS, as s-CAIS seemed to have higher osteotomy accuracy than d-CAIS.
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Affiliation(s)
- Quan Liu
- Research Assistant, Hospital of Stomatology, Guanghua School of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University, Guangzhou, PR China
| | - Yuanxiang Liu
- Research Assistant, Hospital of Stomatology, Guanghua School of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University, Guangzhou, PR China
| | - Danying Chen
- Research Assistant, Hospital of Stomatology, Guanghua School of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University, Guangzhou, PR China
| | - Xiayi Wu
- Research Assistant, Hospital of Stomatology, Guanghua School of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University, Guangzhou, PR China
| | - Ruoxuan Huang
- Graduate student, Hospital of Stomatology, Guanghua School of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University, Guangzhou, PR China
| | - Runheng Liu
- Research Assistant, Hospital of Stomatology, Guanghua School of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University, Guangzhou, PR China
| | - Zetao Chen
- Professor, Hospital of Stomatology, Guanghua School of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University, Guangzhou, PR China
| | - Zhuofan Chen
- Professor, Hospital of Stomatology, Guanghua School of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University, Guangzhou, PR China.
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Heimes D, Becker P, Pabst A, Smeets R, Kraus A, Hartmann A, Sagheb K, Kämmerer PW. How does dental implant macrogeometry affect primary implant stability? A narrative review. Int J Implant Dent 2023; 9:20. [PMID: 37405709 DOI: 10.1186/s40729-023-00485-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2023] [Accepted: 06/21/2023] [Indexed: 07/06/2023] Open
Abstract
PURPOSE The macrogeometry of a dental implant plays a decisive role in its primary stability. A larger diameter, a conical shape, and a roughened surface increase the contact area of the implant with the surrounding bone and thus improve primary stability. This is considered the basis for successful implant osseointegration that different factors, such as implant design, can influence. This narrative review aims to critically review macro-geometric features affecting the primary stability of dental implants. METHODS For this review, a comprehensive literature search and review of relevant studies was conducted based on formulating a research question, searching the literature using keywords and electronic databases such as PubMed, Embase, and Cochrane Library to search for relevant studies. These studies were screened and selected, the study quality was assessed, data were extracted, the results were summarized, and conclusions were drawn. RESULTS The macrogeometry of a dental implant includes its surface characteristics, size, and shape, all of which play a critical role in its primary stability. At the time of placement, the initial stability of an implant is determined by its contact area with the surrounding bone. Larger diameter and a conical shape of an implant result in a larger contact area and better primary stability. But the linear relationship between implant length and primary stability ends at 12 mm. CONCLUSIONS Several factors must be considered when choosing the ideal implant geometry, including local factors such as the condition of the bone and soft tissues at the implant site and systemic and patient-specific factors such as osteoporosis, diabetes, or autoimmune diseases. These factors can affect the success of the implant procedure and the long-term stability of an implant. By considering these factors, the surgeon can ensure the greatest possible therapeutic success and minimize the risk of implant failure.
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Affiliation(s)
- Diana Heimes
- Department of Oral and Maxillofacial Surgery, University Medical Center Mainz, Augustusplatz 2, 55131, Mainz, Germany.
| | - Philipp Becker
- Department of Oral and Maxillofacial Surgery, University Medical Center Mainz, Augustusplatz 2, 55131, Mainz, Germany
- Department of Oral and Maxillofacial Surgery, Federal Armed Forces Hospital, Rübenacherstraße 170, 56072, Koblenz, Germany
| | - Andreas Pabst
- Department of Oral and Maxillofacial Surgery, University Medical Center Mainz, Augustusplatz 2, 55131, Mainz, Germany
- Department of Oral and Maxillofacial Surgery, Federal Armed Forces Hospital, Rübenacherstraße 170, 56072, Koblenz, Germany
| | - Ralf Smeets
- Department of Oral and Maxillofacial Surgery, University Medical Center Hamburg-Eppendorf, Martinistraße 52, 20246, Hamburg, Germany
- Department of Oral and Maxillofacial Surgery, Division of "Regenerative Orofacial Medicine", University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Annika Kraus
- Department of Prosthetic Dentistry, University Medical Center Mainz, Augustusplatz 2, 55131, Mainz, Germany
| | - Amely Hartmann
- Department of Oral and Maxillofacial Surgery, University Medical Center Mainz, Augustusplatz 2, 55131, Mainz, Germany
- Private Practice for Oral Surgery, Echterdinger Straße 7, 70794, Filderstadt, Germany
| | - Keyvan Sagheb
- Department of Oral and Maxillofacial Surgery, University Medical Center Mainz, Augustusplatz 2, 55131, Mainz, Germany
| | - Peer W Kämmerer
- Department of Oral and Maxillofacial Surgery, University Medical Center Mainz, Augustusplatz 2, 55131, Mainz, Germany
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Chang CC, Hong A, Mei CC, Huang YF, Liu HL, Lin IP, Hong HH. Convergent angles of a tapered implant referred from the root profile of premolars. J Dent Sci 2023; 18:264-271. [PMID: 36643279 PMCID: PMC9831854 DOI: 10.1016/j.jds.2022.05.022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2022] [Revised: 05/26/2022] [Indexed: 01/18/2023] Open
Abstract
Background/purpose Limited studies have discussed the convergent profiles regarding tapered implants based on biological considerations. This study analyzed the convergent angles (CAs) of premolar roots and imitated a tapered implant according to the anatomy of tooth roots. Materials and methods A total of 60 single-rooted premolars were explored by micro-computed tomography. Every individual root was divided into 10 segments corono-apically, and the roots' buccolingual (BL) and mesiodistal (MD) CAs were measured by sections. To mimic a dental implant, the irregular shape of examined root cross-sections was transformed into a circular shape with equal areas. A biomimetic dental implant (BDI) was reconstructed and its CAs were compared with those of the natural roots' BL and MD at the examined levels and overall estimation. Results In general, the maxillary and mandibular premolars demonstrated comparable CA patterns. However, significantly different CA patterns of BL, MD, and BDI were developed for both the maxillary and mandibular roots at the examined levels. The BL's CAs were greater than those CAs measured from the BDI and MD aspects, particularly for the sections at the middle and apical thirds of the roots. For overall CAs, the BDI's CAs were comparable with the average CAs of the BL and MD for both premolar groups. Conclusion Instead of a cylindrical configuration, the BDI prototype demonstrated a tapered model with a continuous slope. The average CA of BDI was 14°-24°, serving as a biological reference for future tapered implant design and research.
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Affiliation(s)
- Chung-Chieh Chang
- Department of Periodontics, Chang Gung Memorial Hospital Linkou Main Branch and Chang Gung University, Taoyuan City, 333, Taiwan
| | - Alex Hong
- Department of Periodontics, Chang Gung Memorial Hospital Linkou Main Branch and Chang Gung University, Taoyuan City, 333, Taiwan
| | - Chih-Chun Mei
- New Taipei City Municipal Tucheng Hospital and Chang Gung University, New Taipei City and Taoyuan City, Taiwan
| | - Yi-Fang Huang
- Department of General Dentistry, Chang Gung Memorial Hospital Linkou Main Branch, Taoyuan City, Taiwan
| | - Heng-Liang Liu
- Instrument Department, Chang Gung Memorial Hospital Linkou Main Branch, Taoyuan City, Taiwan
| | - I-Ping Lin
- Division of Periodontology, Department of Dentistry, National Taiwan University Hospital, Hsinchu Branch, Hsinchu, Taiwan,Corresponding author. No. 25, Lane 442, Section 1, Jingguo Road, North District, Hsinchu 300, Taiwan
| | - Hsiang-Hsi Hong
- Department of Periodontics, Chang Gung Memorial Hospital Linkou Main Branch and Chang Gung University, Taoyuan City, 333, Taiwan,Corresponding author. 5, Fu-Shin Street, Guishan Dist., Taoyuan City 333, Taiwan
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Covariates Relating to Implant Failure and Marginal Bone Loss of a Novel Triangular Neck-Implant Placed by Post-Graduate Students: A 1-Year Prospective Cohort Study. MATERIALS 2022; 15:ma15061987. [PMID: 35329438 PMCID: PMC8952199 DOI: 10.3390/ma15061987] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/27/2022] [Revised: 02/28/2022] [Accepted: 03/04/2022] [Indexed: 02/01/2023]
Abstract
(1) Background: Most of the clinical literature dealing with dental implants has been issued by experienced teams working either in university settings or in private practice. The purpose of this study was to identify contributing covariates to implant failure and marginal bone loss (MBL) at the 1-year follow-up of a novel triangular-neck implant design when placed by inexperienced post-graduate students. (2) Methods: A prospective cohort study was conducted on study participants eligible for implant placement at the UIC (International University of Catalonia), Barcelona, Spain. Implant failure rate and contributors to implant failure and MBL were investigated among 24 implant and patient variables. (3) Results: One hundred and twenty implants (V3, MIS) were placed and rehabilitated by the students. The mean insertion torque was 37.1 Ncm. Survival and success rates were 97.5% and 96.7%, respectively. Implants placed in patients with smoking habits displayed a tendency of higher failure risk (OR = 5.31, p = 0.17) when compared to non-smokers. The mean (SD) MBL was 0.51 (0.44) mm. Gender significantly affected the MBL (p = 0.020). Bleeding on probing (BoP) on the buccal sites proved to be a good predictor of proximal MBL (p = 0.030). (4) Conclusions: The survival and success rates of the V3 triangular-neck implant placed by inexperienced post-graduate students at the 1-year follow-up were high and similar to the ones published in the literature by experienced teams on other implants.
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Indriksone I, Vitols P, Avkstols V, Grieznis L, Stamers K, Linder S, Dard M. Quality of life, patient preferences, and implant survival and success of tapered implant-retained mandibular overdentures as a function of the attachment system. J Periodontal Implant Sci 2022:52.e39. [DOI: 10.5051/jpis.2105840292] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2021] [Revised: 01/24/2022] [Accepted: 03/14/2022] [Indexed: 11/18/2022] Open
Affiliation(s)
- Ilze Indriksone
- Department of Prosthetic Dentistry, Faculty of Dentistry of Riga Stradins University, Riga, Latvia
| | - Pauls Vitols
- Department of Prosthetic Dentistry, Faculty of Dentistry of Riga Stradins University, Riga, Latvia
| | - Viktors Avkstols
- Department of Prosthetic Dentistry, Faculty of Dentistry of Riga Stradins University, Riga, Latvia
| | - Linards Grieznis
- Department of Prosthetic Dentistry, Faculty of Dentistry of Riga Stradins University, Riga, Latvia
| | - Kaspars Stamers
- Department of Maxillofacial Surgery, Faculty of Dentistry of Riga Stradins University, Riga, Latvia
| | - Susy Linder
- Department of Medical Affairs, Institut Straumann AG-Basel, Basel, Switzerland
| | - Michel Dard
- Department of Medical Affairs, Institut Straumann AG-Basel, Basel, Switzerland
- Section of Oral, Diagnostic and Rehabilitation Sciences, Columbia University, College of Dental Medicine, New York, NY, USA
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Rito-Macedo F, Barroso-Oliveira M, Paranhos LR, Rodrigues-Brum J, Pereira-Lima IF, Gomes-França FM, de Brito-Junior RB. Implant insertion angle and depth: Peri-implant bone stress analysis by the finite element method. J Clin Exp Dent 2021; 13:e1167-e1173. [PMID: 34987707 PMCID: PMC8715559 DOI: 10.4317/jced.58930] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2021] [Accepted: 10/11/2021] [Indexed: 11/13/2022] Open
Abstract
Background The study aimed to assess the influence of different implant insertion angles and depths on the stresses produced on the surface of peri-implant bone tissue under axial and oblique loading.
Material and Methods The entire study followed the recommendations of the Checklist for Reporting In-vitro Studies (CRIS). The implant was placed in the region of element 36, according to the following models: M1 (0 mm / 0°); M2 (0 mm / 17°); M3 (0 mm / 30°); M4 (2 mm / 0°); M5 (2 mm / 17°); M6 (2 mm / 30°). The models were subjected to loading, with intensity of 100 N. The stress assessment followed the Mohr-Coulomb criterion and qualitative and quantitative analyses were performed.
Results Angled implants and installed below the bone crest produced the highest stresses on the cortical bone, and the axial load presented the highest stress peaks on the buccal side of implants perpendicular to the bone crest. Regardless of the type of load (axial or oblique), inclined implants presented the highest stress peaks on the lingual side of the cortical bone.
Conclusions Implants installed perpendicular to and with a prosthetic platform at bone crest height provided the lowest stresses to peri-implant bone tissue under both axial and oblique loading. Key words:Finite element analysis, dental implants, axial loading, biomechanical phenomena.
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Affiliation(s)
- Fabiano Rito-Macedo
- Assistant Professor of Periodontics, State University of Amazonas (UEA), Manaus, Amazonas, Brazil
| | - Millena Barroso-Oliveira
- Post-Graduation Program in Dentistry, Federal University of Uberlândia (UFU), Uberlândia, MG, Brazil
| | - Luiz-Renato Paranhos
- Division of Preventive and Community Dentistry, School of Dentistry dentists, Federal University of Uberlândia (UFU), Uberlândia, MG, Brazil
| | - Joelson Rodrigues-Brum
- Assistant Professor of Endodontics, State University of Amazonas (UEA), Manaus, Amazonas, Brazil
| | - Igor-Felipe Pereira-Lima
- Department of Oral Pathology, Federal University of Rio Grande do Sul (UFRGS), Porto Alegre, Rio Grande do Sul, Brazil
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El Chaar E, Puisys A, Sabbag I, Bellón B, Georgantza A, Kye W, Pippenger BE. A novel fully tapered, self-cutting tissue-level implant: non-inferiority study in minipigs. Clin Oral Investig 2021; 25:6127-6137. [PMID: 33861379 PMCID: PMC8531107 DOI: 10.1007/s00784-021-03912-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2020] [Accepted: 03/23/2021] [Indexed: 11/29/2022]
Abstract
Objectives To assess the osseointegration and crestal bone level maintenance of a novel fully tapered self-cutting tissue-level implant for immediate placement (test) compared to a clinically established tissue-level implant (control) in moderate bone quality. Materials and methods Test and control implants were compared in 3 groups, i.e., small-, medium-, and large-diameter implants in an edentulous mandibular minipig model with moderate bone quality after 12 weeks of healing. Histometrically derived bone-to-implant contact (BIC) and first bone-to-implant contact (fBIC) were subjected to statistical non-inferiority testing. Maximum insertion torque values in artificial bone were assessed for comparison. Results BIC values for the tests and control implants for all 3 diameters were comparable and non-inferior: small diameter (61.30 ± 10.63% vs. 54.46 ± 18.31%) (p=0.99), medium diameter (60.91 ± 14.42 vs. 54.68 ± 9.16) (p=0.55), and large diameter (45.60 ± 14.67 vs. 52.52 ± 14.76) (p=0.31). fBIC values for test implants were higher and non-inferior compared to control implants in all three groups. Test implants further showed distinctly higher maximum insertion torque values compared to control implants. Conclusion The investigated novel tissue-level implant is able to achieve high levels of primary and secondary implant stability under simultaneous preservation of crestal bone levels. This qualifies the studied implant as an attractive candidate for immediate placement in bone of limited quality. Clinical relevance This pilot pre-clinical study investigated a novel tissue-level implant for immediate placement. With the aim of translating the studied prototype into clinical application pre-clinical models, procedures and controls have been chosen with the aim of reflecting its future clinical indication and use. Supplementary Information The online version contains supplementary material available at 10.1007/s00784-021-03912-w.
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Affiliation(s)
- Edgard El Chaar
- Department of Periodontology and Implant Dentistry, New York University, New York, USA
| | - Algirdas Puisys
- Vilnius Research Group, Vilnius, Lithuania.,Vilnius Implantology Center, Vilnius, Lithuania
| | - Itai Sabbag
- Lahav Research Institute, Kibbutz Lahav, Israel
| | - Benjamin Bellón
- Department of Preclinical and Translational Research, Institut Straumann AG, Basel, Switzerland.,Department of Periodontology, Faculty of Dentistry, University of Zurich, Zurich, Switzerland
| | - Aikaterini Georgantza
- Department of Periodontology and Implant Dentistry, New York University, New York, USA
| | - Wayne Kye
- Department of Periodontology and Implant Dentistry, New York University, New York, USA
| | - Benjamin E Pippenger
- Department of Preclinical and Translational Research, Institut Straumann AG, Basel, Switzerland. .,Department of Periodontology, Faculty of Dentistry, University of Bern, Freiburgstrasse 7, CH-3010, Bern, Switzerland.
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Characteristics of the convergent angles of tapered implants based on a premolar root model. J Prosthet Dent 2021; 128:1320-1327. [PMID: 33867165 DOI: 10.1016/j.prosdent.2021.02.033] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2020] [Revised: 02/09/2021] [Accepted: 02/10/2021] [Indexed: 11/21/2022]
Abstract
STATEMENT OF PROBLEM Developing tapered implants with the most appropriate angular characteristics requires an improved analysis of the anatomy of premolar roots. PURPOSE The purpose of this observational study was to analyze the 3D anatomy of premolar roots by determining the tapered slope and convergent angle (TS/CA), to transform the TS/CA patterns into those in which the tapered implants mimic natural tooth roots, and to provide TS/CA references for future investigations. MATERIAL AND METHODS A total of 73 human single-rooted premolars were surveyed and analyzed by microcomputed tomography and an associated software program. The 3D root surface area (RSA), the radius/diameter (R/D) at the planned first to tenth millimeter levels apical to the cementoenamel junction (CEJ), and the TS/CA at corresponding levels were calculated. The results were statistically analyzed by using an independent samples t test to assess the general differences of tested parameters between maxillary and mandibular premolars. A paired t test was used to examine the significant intragroup TS/CA differences between sequential coronoapical levels. One-way ANOVA was applied to study the general significance of developmental patterns in maxillary and/or mandibular groups. Two-way ANOVA was used to inspect the TS/CA significance at various measurements coronoapically between the maxillary and mandibular premolars (α=.05). RESULTS Generally, the RSA, root length, R/D, and TS/CA parameters examined for the maxillary premolar roots differed significantly from those for the mandibular roots at the evaluated levels (P<.05). According to the measurements, the maxillary premolar roots generally exhibited nonsignificant RSA and R/D reduction patterns, with a decreasing angle of TS=13.44 degrees and CA=24.53 degrees coronoapically. However, mandibular premolar roots exhibited a significant reduction pattern, with TS=11.25 degrees and CA=21.06 degrees coronoapically according to both individual and general evaluations. CONCLUSIONS Based on the developmental patterns of the evaluated TSs/CAs, tapered implants imitating premolar root anatomy should have a conical rather than a cylindrical shape, and the R/D of these models should be reduced to half at the apical third. However, further studies are warranted to identify more TS/CA characteristics related to the tapered implants, including the TSs/CAs of other tooth types.
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Song W, Xiao Y. Sequential drug delivery of vancomycin and rhBMP-2 via pore-closed PLGA microparticles embedded photo-crosslinked chitosan hydrogel for enhanced osteointegration. Int J Biol Macromol 2021; 182:612-625. [PMID: 33838200 DOI: 10.1016/j.ijbiomac.2021.03.181] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Revised: 03/20/2021] [Accepted: 03/26/2021] [Indexed: 02/07/2023]
Abstract
As generally accepted, inhibiting the bacterial invasion at initial stage and promoting the behavior of related osteogenesis cells afterwards is crucial to achieve favorable osteointegration after dental implantation. In this study, a novel combined structured hydrogel composed of chitosan and pore-closed poly(lactic-co-glycolic acid) microparticles was prepared and characterized. In vitro and in-vivo studies have identified that this biocompatible material can rapidly release vancomycin at initial 2 days and then sustainedly release recombinant human bone morphogenetic protein-2 for about 12 days, thus respectively accomplish antibacterial and osteogenesis functions. This sequential drug release system can be used as a promising coating material to improve the surface conditions of dental implant to enhance the osteointegration after surgery.
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Affiliation(s)
- Wei Song
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, No.14, Section 3, Ren Min Nan Rd., Chengdu 610041, Sichuan, China
| | - Yu Xiao
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, No.14, Section 3, Ren Min Nan Rd., Chengdu 610041, Sichuan, China.
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11
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Eshkol‐Yogev I, Tandlich M, Shapira L. Effect of implant neck design on primary and secondary implant stability in the posterior maxilla: A prospective randomized controlled study. Clin Oral Implants Res 2019; 30:1220-1228. [DOI: 10.1111/clr.13535] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2018] [Revised: 08/07/2019] [Accepted: 09/04/2019] [Indexed: 11/28/2022]
Affiliation(s)
- Inbar Eshkol‐Yogev
- Department of Periodontology The Hebrew University ‐ Hadassah Faculty of Dental Medicine Jerusalem Israel
| | - Moshik Tandlich
- Department of Periodontology The Hebrew University ‐ Hadassah Faculty of Dental Medicine Jerusalem Israel
| | - Lior Shapira
- Department of Periodontology The Hebrew University ‐ Hadassah Faculty of Dental Medicine Jerusalem Israel
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12
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Yao CJ, Ma L, Mattheos N. Can resonance frequency analysis detect narrow marginal bone defects around dental implants? An ex vivo
animal pilot study. Aust Dent J 2017; 62:433-439. [DOI: 10.1111/adj.12536] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/22/2017] [Indexed: 11/30/2022]
Affiliation(s)
- CJ Yao
- Oral Rehabilitation; Faculty of Dentistry; University of Hong Kong; Hong Kong China
| | - L Ma
- Oral Rehabilitation; Faculty of Dentistry; University of Hong Kong; Hong Kong China
| | - N Mattheos
- Oral Rehabilitation; Faculty of Dentistry; University of Hong Kong; Hong Kong China
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13
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Wilson TG, Miller RJ, Trushkowsky R, Dard M. Tapered Implants in Dentistry: Revitalizing Concepts with Technology: A Review. Adv Dent Res 2017; 28:4-9. [PMID: 26927482 DOI: 10.1177/0022034516628868] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The most common approach to lessen treatment times is by decreasing the healing period during which osseointegration is established. Implant design parameters such as implant surface, primary stability, thread configuration, body shape, and the type of bone have to be considered to obtain this objective. The relationship that exists between these components will define the initial stability of the implant. It is believed implant sites using a tapered design and surface modification can increase the primary stability in low-density bone. Furthermore, recent experimental preclinical work has shown the possibility of attaining primary stability of immediately loaded, tapered dental implants without compromising healing and rapid bone formation while minimizing the implant stability loss at compression sites. This may be of singular importance with immediate/early functional loading of single implants placed in poor-quality bone. The selection of an implant that will provide adequate stability in bone of poor quality is important. A tapered-screw implant design will provide adequate stability because it creates pressure on cortical bone in areas of reduced bone quality. Building on the success of traditional tapered implant therapy, newer tapered implant designs should aim to maximize the clinical outcome by implementing new technologies with adapted clinical workflows.
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Affiliation(s)
| | | | - R Trushkowsky
- New York University College of Dentistry, Department of Cariology and Comprehensive Care, New York City, NY, USA
| | - M Dard
- New York University College of Dentistry, Department of Periodontology and Implant Dentistry, New York City, NY, USA Institut Straumann, Basel, Switzerland
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14
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Affiliation(s)
- M Dard
- New York University, College of Dentistry, New York, NY, USA Institut Straumann, Medical Affairs, Basel, Switzerland
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15
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Waechter J, Madruga MDM, Carmo Filho LCD, Leite FRM, Schinestsck AR, Faot F. Comparison between tapered and cylindrical implants in the posterior regions of the mandible: A prospective, randomized, split-mouth clinical trial focusing on implant stability changes during early healing. Clin Implant Dent Relat Res 2017; 19:733-741. [DOI: 10.1111/cid.12501] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2016] [Revised: 05/07/2017] [Accepted: 05/08/2017] [Indexed: 11/29/2022]
Affiliation(s)
- Janine Waechter
- Graduate Program in Dentistry; Federal University of Pelotas; Pelotas RS Brazil
| | | | - Luiz Carlos do Carmo Filho
- Department of Prosthodontics and Periodontology; Piracicaba Dental School, University of Campinas; Piracicaba Brazil
| | | | | | - Fernanda Faot
- Department of Restorative Dentistry; School of Dentistry, Federal University of Pelotas; Brazil
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