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Wang SH, Hsu JT, Fuh LJ, Peng SL, Huang HL, Tsai MT. New classification for bone type at dental implant sites: a dental computed tomography study. BMC Oral Health 2023; 23:324. [PMID: 37231447 DOI: 10.1186/s12903-023-03039-2] [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: 01/21/2023] [Accepted: 05/13/2023] [Indexed: 05/27/2023] Open
Abstract
OBJECTIVE This study proposed a new classification method of bone quantity and quality at the dental implant site using cone-beam computed tomography (CBCT) image analysis, classifying cortical and cancellous bones separately and using CBCT for quantitative analysis. METHODS Preoperative CBCT images were obtained from 128 implant patients (315 sites). First, measure the crestal cortical bone thickness (in mm) and the cancellous bone density [in grayscale values (GV) and bone mineral density (g/cm3)] at the implant sites. The new classification for bone quality at the implant site proposed in this study is a "nine-square division" bone classification system, where the cortical bone thickness is classified into A: > 1.1 mm, B:0.7-1.1 mm, and C: < 0.7 mm, and the cancellous bone density is classified into 1: > 600 GV (= 420 g/cm3), 2:300-600 GV (= 160 g/cm3-420 g/cm3), and 3: < 300 GV (= 160 g/cm3). RESULTS The results of the nine bone type proportions based on the new jawbone classification were as follows: A1 (8.57%,27/315), A2 (13.02%), A3 (4.13%), B1 (17.78%), B2 (20.63%), B3 (8.57%) C1 (4.44%), C2 (14.29%), and C3 (8.57%). CONCLUSIONS The proposed classification can complement the parts overlooked in previous bone classification methods (bone types A3 and C1). TRIAL REGISTRATION The retrospective registration of this study was approved by the Institutional Review Board of China Medical University Hospital, No. CMUH 108-REC2-181.
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Affiliation(s)
- Shiuan-Hui Wang
- School of Dentistry, China Medical University, Taichung, 404, Taiwan
| | - Jui-Ting Hsu
- School of Dentistry, China Medical University, Taichung, 404, Taiwan.
- Department of Biomedical Engineering, China Medical University, Taichung, 404, Taiwan.
| | - Lih-Jyh Fuh
- School of Dentistry, China Medical University, Taichung, 404, Taiwan
- Department of Dentistry, China Medical University and Hospital, Taichung, 404, Taiwan
| | - Shin-Lei Peng
- Department of Biomedical Imaging and Radiological Science, China Medical University, Taichung, 404, Taiwan
| | - Heng-Li Huang
- School of Dentistry, China Medical University, Taichung, 404, Taiwan
- Department of Biomedical Engineering, China Medical University, Taichung, 404, Taiwan
| | - Ming-Tzu Tsai
- Department of Biomedical Engineering, Hungkuang University, Taichung, 433, Taiwan
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Falcinelli C, Valente F, Vasta M, Traini T. Finite element analysis in implant dentistry: State of the art and future directions. Dent Mater 2023:S0109-5641(23)00092-1. [PMID: 37080880 DOI: 10.1016/j.dental.2023.04.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2023] [Revised: 03/30/2023] [Accepted: 04/05/2023] [Indexed: 04/22/2023]
Abstract
OBJECTIVE To discuss the state of the art of Finite Element (FE) modeling in implant dentistry, to highlight the principal features and the current limitations, and giving recommendations to pave the way for future studies. METHODS The articles' search was performed through PubMed, Web of Science, Scopus, Science Direct, and Google Scholar using specific keywords. The articles were selected based on the inclusion and exclusion criteria, after title, abstract and full-text evaluation. A total of 147 studies were included in this review. RESULTS To date, the FE analysis of the bone-dental implant system has been investigated by analyzing several types of implants; modeling only a portion of bone considered as isotropic material, despite its anisotropic behavior; assuming in most cases complete osseointegration; considering compressive or oblique forces acting on the implant; neglecting muscle forces and the bone remodeling process. Finally, there is no standardized approach for FE modeling in the dentistry field. SIGNIFICANCE FE modeling is an effective computational tool to investigate the long-term stability of implants. The ultimate aim is to transfer such technology into clinical practice to help dentists in the diagnostic and therapeutic phases. To do this, future research should deeply investigate the loading influence on the bone-implant complex at a microscale level. This is a key factor still not adequately studied. Thus, a multiscale model could be useful, allowing to account for this information through multiple length scales. It could help to obtain information about the relationship among implant design, distribution of bone stress, and bone growth. Finally, the adoption of a standardized approach will be necessary, in order to make FE modeling highly predictive of the implant's long-term stability.
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Affiliation(s)
- Cristina Falcinelli
- Department of Engineering and Geology, University "G. d'Annunzio" of Chieti-Pescara, Viale Pindaro 42, Pescara 65127, Italy.
| | - Francesco Valente
- Department of Innovative Technologies in Medicine & Dentistry, University "G. d'Annunzio" of Chieti-Pescara, Via dei Vestini 31, Chieti 66100, Italy; Electron Microscopy Laboratory, University "G. d'Annunzio" of Chieti-Pescara, Via dei Vestini 31, Chieti 66100, Italy
| | - Marcello Vasta
- Department of Engineering and Geology, University "G. d'Annunzio" of Chieti-Pescara, Viale Pindaro 42, Pescara 65127, Italy
| | - Tonino Traini
- Department of Innovative Technologies in Medicine & Dentistry, University "G. d'Annunzio" of Chieti-Pescara, Via dei Vestini 31, Chieti 66100, Italy; Electron Microscopy Laboratory, University "G. d'Annunzio" of Chieti-Pescara, Via dei Vestini 31, Chieti 66100, Italy
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Mohamed M, Pisavadia H, Westover L. A finite element model for evaluating the effectiveness of the Advanced System for Implant Stability Testing (ASIST). J Biomech 2021; 124:110570. [PMID: 34171676 DOI: 10.1016/j.jbiomech.2021.110570] [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] [Received: 06/29/2020] [Revised: 05/31/2021] [Accepted: 06/07/2021] [Indexed: 11/24/2022]
Abstract
The Advanced system for Implant Stability Testing (ASIST) was developed to evaluate the stability of osseointegrated implants. ASIST matches the physical response with an analytical model's prediction to determine the stiffness of the bone implant interface (BII) which is then used to calculate the ASIST Stability Coefficient (ASC). In this investigation, a 3D dynamic finite element (FE) model of the ASIST experimental impact technique for bone anchored hearing aids was created. The objectives were to evaluate the analytical model's ability to capture the behavior of the implant system and to assess its effectiveness in minimising the effects of the system's geometry on the ASC scores. The models were developed on ABAQUS®, they consisted of the implant, abutment, screw, base support and impact rod. The models relied on frictional contact definitions between the system's components. The simplified "three-part" model had the implant, abutment and screw merged as one part while the "five-part" model treated them as separate components. Different interface conditions were simulated (friction coefficient range: 0-0.9) for three abutment lengths (6, 9 and 12 mm). The simulation output was the average nodal acceleration response of the rod, which was imported to the custom ASIST program in Mathematica® to obtain the ASC scores. The overall quality of the curve fits indicate that the analytical model is capable of representing the system's behavior. Moreover,ASC scores provide a reliable assessment of implant stability as they are sensitive to interface conditions and are minimally influenced by the system's geometry.
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Lyris V, Millen C, Besi E, Pace-Balzan A. Effect of leukocyte and platelet rich fibrin (L-PRF) on stability of dental implants. A systematic review and meta-analysis. Br J Oral Maxillofac Surg 2021; 59:1130-1139. [PMID: 34702597 DOI: 10.1016/j.bjoms.2021.01.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2020] [Accepted: 01/08/2021] [Indexed: 11/16/2022]
Abstract
The aim of this study was to assess the impact, if any, of L-PRF application in an implant bed prior to implant placement, focusing on stability by means of implant stability quotient (ISQ) values. The literature was searched in a systematic way by means of the main databases and hand searching of the most relevant journals. The inclusion and exclusion criteria were used to determine the eligible studies included in this review. Only randomised controlled trials (RCT) and controlled clinical trials (CCT) were included. A total of four RCTs were included for data extraction. The risk of bias was deemed moderate to unclear. Meta-analysis was performed to assess the effect of L-PRF, on implant stability, immediately post-insertion in three studies, after one week from the implant placement in three studies and after four weeks for all the included studies. The fixed effects model has shown Hedges g statistic for the one week varying from 0.380 to 1.401 with a pooled figure of 0.764 (95% CI 0.443 to 1.085) and for four weeks varying between 0.74 and 1.1 with a combined effect of 0.888 (95% CI 0.598 to 1.177). The results for both intervals were in favour of the use of L-PRF while the statistical difference immediately post-insertion was not statistically significant. The present systematic review, though acknowledging its limitations, suggests that L-PRF has a positive effect on secondary implant stability and that needs to be correlated to the clinical practice to measure the actual clinical effect by means of reducing treatment times.
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Affiliation(s)
- V Lyris
- Oral Surgery Department, Edinburgh Dental Institute, The University of Edinburgh, Lauriston Place, Lauriston Building, Edinburgh, EH3 9HA, United Kingdom.
| | - C Millen
- Restorative Dentistry Department, Edinburgh Dental Institute, The University of Edinburgh, Lauriston Place, Lauriston Building, Edinburgh, EH3 9HA, United Kingdom
| | - E Besi
- Oral Surgery Department, Edinburgh Dental Institute, The University of Edinburgh, Lauriston Place, Lauriston Building, Edinburgh, EH3 9HA, United Kingdom
| | - A Pace-Balzan
- Restorative Dentistry Department, Edinburgh Dental Institute, The University of Edinburgh, Lauriston Place, Lauriston Building, Edinburgh, EH3 9HA, United Kingdom
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Wu C, Fang J, Entezari A, Sun G, Swain MV, Xu Y, Steven GP, Li Q. A time-dependent mechanobiology-based topology optimization to enhance bone growth in tissue scaffolds. J Biomech 2021; 117:110233. [PMID: 33601086 DOI: 10.1016/j.jbiomech.2021.110233] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2020] [Revised: 10/05/2020] [Accepted: 01/03/2021] [Indexed: 12/21/2022]
Abstract
Scaffold-based bone tissue engineering has been extensively developed as a potential means to treatment of large bone defects. To enhance the biomechanical performance of porous tissue scaffolds, computational design techniques have gained growing popularity attributable to their compelling efficiency and strong predictive features compared with time-consuming trial-and-error experiments. Nevertheless, the mechanical stimulus necessary for bone regeneration, which characterizes dynamic nature due to continuous variation in the bone-scaffold construct system as a result of bone-ingrowth and scaffold biodegradation, is often neglected. Thus, this study proposes a time-dependent mechanobiology-based topology optimization framework for design of tissue scaffolds, thereby developing an ongoing favorable microenvironment and ensuring a long-term outcome for bone regeneration. For the first time, a level-set based topology optimization algorithm and a time-dependent shape derivative are developed to optimize the scaffold architecture. In this study, a large bone defect in a simulated 2D femur model and a partial defect in a 3D femur model are considered to demonstrate the effectiveness of the proposed design method. The results are compared with those obtained from stiffness-based topology optimization, time-independent design and typical scaffold constructs, showing significant advantages in continuing bone ingrowth outcomes.
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Affiliation(s)
- Chi Wu
- School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Sydney, NSW 2006, Australia
| | - Jianguang Fang
- School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW 2007, Australia
| | - Ali Entezari
- School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Sydney, NSW 2006, Australia
| | - Guangyong Sun
- School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Sydney, NSW 2006, Australia
| | - Michael V Swain
- School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Sydney, NSW 2006, Australia
| | - Yanan Xu
- School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Sydney, NSW 2006, Australia
| | - Grant P Steven
- School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Sydney, NSW 2006, Australia
| | - Qing Li
- School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Sydney, NSW 2006, Australia.
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The effect of hyperlipidemia on bone graft regeneration of peri-implantal created defects in rabbits. Int J Implant Dent 2019; 5:18. [PMID: 31089911 PMCID: PMC6517464 DOI: 10.1186/s40729-019-0170-x] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2018] [Accepted: 03/15/2019] [Indexed: 12/05/2022] Open
Abstract
Aim It is reported that hyperlipidemia affects quality and density of bone and adversely affects wound healing. The effect of hyperlipidemia on implant osseointegration and peri-implant defect regeneration has not been fully explained. The purpose of this study was to examine the effects of hyperlipidemia on the healing potential of the materials used for peri-implant bone regeneration and implant stability. Materials and methods Twelve male, New Zealand rabbits were used in this study. Half of the rabbits were fed a 2% cholesterol diet for 8 weeks to induce hypercholesterolemia. Peri-implant defects (7 mm diameter) were created in the tibias of rabbits and placed implants (3.3 mm in diameter). This study was conducted as a split-mouth design. Animals were randomly divided into two groups: (1) hypercholesterol+autogenous graft group and hypercholesterol+xenograft group (n = 6), and (2) autogenous graft and xenograft groups as controls (n = 6). At 8 weeks after surgery, the rabbits were euthanized. During implant surgery and at 8 weeks, implant stability was measured with resonance frequency analysis (RFA values). Bone-to-implant contact (BIC) was analyzed via histomorphometric analysis. Results Hyperlipidemic groups showed significantly lower BIC values than those of the control groups at 8 weeks (p < 0.05). According to baseline RFA readings, there was no significant difference between control and hyperlipidemic groups (p ˃ 0.05). The hypercholesterol+autogenous graft group had significantly lower RFA readings and BIC values than the hypercholesterol+xenograft group at 8 weeks (p < 0.05). Conclusion Within the limitations of this study, it was found that hyperlipidemia may negatively affect the implant stability especially in the autogenous group and also, may decrease peri-implant bone regeneration. However, further studies are necessary to confirm these results more.
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Gan XQ, Xiao Y, Ma RY, Huang CP, Wu Y, Yang BC, Yang Q, Bao CY, Yu HY. [Expert consensus on biomechanical research of dental implant]. HUA XI KOU QIANG YI XUE ZA ZHI = HUAXI KOUQIANG YIXUE ZAZHI = WEST CHINA JOURNAL OF STOMATOLOGY 2019; 37:115-123. [PMID: 31168976 PMCID: PMC7030149 DOI: 10.7518/hxkq.2019.02.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 12/07/2018] [Revised: 01/15/2019] [Indexed: 02/05/2023]
Abstract
Current biomechanical research of dental implants focuses on the mechanical damage and enhancement mechanism of the implant-abutment interface as well as how to obtain better mechanical strength and longer fatigue life of dental implants. The mechanical properties of implants can be comprehensively evaluated by strain gauge analysis, photo elastic stress analysis, digital image correlation, finite element analysis, implant bone bonding strength test, and measurement of mechanical properties. Finite element analysis is the most common method for evaluating stress distribution in dental implants, and static pressure and fatigue tests are commonly used in mechanical strength test. This article reviews biomechanical research methods and evaluation indices of dental implants. Results provide methodology guidelines in the field of biomechanics by introducing principles, ranges of application, advantages, and limitations, thereby benefitting researchers in selecting suitable methods. The influencing factors of the experimental results are presented and discussed to provide implant design ideas for researchers.
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Affiliation(s)
- Xue-Qi Gan
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & Dept. of Prosthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
| | - Yu Xiao
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases
& Dept. of Oral and Maxillofacial Surgery, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
| | - Rui-Yang Ma
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & Dept. of Prosthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
| | - Chun-Peng Huang
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases
& Dept. of Oral and Maxillofacial Surgery, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
| | - Yao Wu
- Engineering Research Center in Biomaterials, Sichuan University & Sichuan Guojia Biomaterials Co., Ltd, Chengdu 610064, China
| | - Bang-Cheng Yang
- Engineering Research Center in Biomaterials, Sichuan University & Sichuan Guojia Biomaterials Co., Ltd, Chengdu 610064, China
| | - Qi Yang
- Chengdu Puchuan Biomaterials Co., Ltd, Chengdu 611731, China
| | - Chong-Yun Bao
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases
& Dept. of Oral and Maxillofacial Surgery, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
| | - Hai-Yang Yu
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & Dept. of Prosthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
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Modal analysis for implant stability assessment: Sensitivity of this methodology for different implant designs. Dent Mater 2018; 34:1235-1245. [DOI: 10.1016/j.dental.2018.05.016] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2018] [Revised: 05/18/2018] [Accepted: 05/18/2018] [Indexed: 01/03/2023]
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Chang Y, Tambe AA, Maeda Y, Wada M, Gonda T. Finite element analysis of dental implants with validation: to what extent can we expect the model to predict biological phenomena? A literature review and proposal for classification of a validation process. Int J Implant Dent 2018. [PMID: 29516219 PMCID: PMC5842167 DOI: 10.1186/s40729-018-0119-5] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
A literature review of finite element analysis (FEA) studies of dental implants with their model validation process was performed to establish the criteria for evaluating validation methods with respect to their similarity to biological behavior. An electronic literature search of PubMed was conducted up to January 2017 using the Medical Subject Headings “dental implants” and “finite element analysis.” After accessing the full texts, the context of each article was searched using the words “valid” and “validation” and articles in which these words appeared were read to determine whether they met the inclusion criteria for the review. Of 601 articles published from 1997 to 2016, 48 that met the eligibility criteria were selected. The articles were categorized according to their validation method as follows: in vivo experiments in humans (n = 1) and other animals (n = 3), model experiments (n = 32), others’ clinical data and past literature (n = 9), and other software (n = 2). Validation techniques with a high level of sufficiency and efficiency are still rare in FEA studies of dental implants. High-level validation, especially using in vivo experiments tied to an accurate finite element method, needs to become an established part of FEA studies. The recognition of a validation process should be considered when judging the practicality of an FEA study.
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Affiliation(s)
- Yuanhan Chang
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, 1-8 Yamadaoka, Suita, Osaka, 565-0871, Japan.
| | - Abhijit Anil Tambe
- Mahatma Gandhi Vidyamandir's Karmaveer Bhausaheb Hiray Dental College & Hospital, Mumbai Agra Road, Panchwati, Nashik, Maharashtra, India
| | - Yoshinobu Maeda
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, 1-8 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Masahiro Wada
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, 1-8 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Tomoya Gonda
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, 1-8 Yamadaoka, Suita, Osaka, 565-0871, Japan
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Ho KN, Lee SY, Huang HM. Damping ratio analysis of tooth stability under various simulated degrees of vertical alveolar bone loss and different root types. Biomed Eng Online 2017; 16:97. [PMID: 28774336 PMCID: PMC5543751 DOI: 10.1186/s12938-017-0388-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2017] [Accepted: 07/26/2017] [Indexed: 11/21/2022] Open
Abstract
Background The purpose of this study was to evaluate the feasibility of using damping ratio (DR) analysis combined with resonance frequency (RF) and periotest (PTV) analyses to provide additional information about natural tooth stability under various simulated degrees of alveolar vertical bone loss and various root types. Methods Three experimental tooth models, including upper central incisor, upper first premolar, and upper first molar were fabricated using Ti6Al4V alloy. In the tooth models, the periodontal ligament and alveolar bone were simulated using a soft lining material and gypsum, respectively. Various degrees of vertical bone loss were simulated by decreasing the surrounding bone level apically from the cementoenamel junction in 2-mm steps incrementally downward for 10 mm. A commercially available RF analyzer was used to measure the RF and DR of impulse-forced vibrations on the tooth models. Results The results showed that DRs increased as alveolar vertical bone height decreased and had high coefficients of determination in the linear regression analysis. The damping ratio of the central incisor model without a simulated periodontal ligament were 11.95 ± 1.92 and 27.50 ± 0.67% respectively when their bone levels were set at 2 and 10 mm apically from the cementoenamel junction. These values significantly changed to 28.85 ± 2.54% (p = 0.000) and 51.25 ± 4.78% (p = 0.003) when the tooth model was covered with simulated periodontal ligament. Moreover, teeth with different root types showed different DR and RF patterns. Teeth with multiple roots had lower DRs than teeth with single roots. Conclusion Damping ratio analysis combined with PTV and RF analysis provides more useful information on the assessment of changes in vertical alveolar bone loss than PTV or RF analysis alone.
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Affiliation(s)
- Kuo-Ning Ho
- School of Dentistry, Taipei Medical University, 250, Wu-Hsing Street, Taipei, Taiwan
| | - Sheng-Yang Lee
- School of Dentistry, Taipei Medical University, 250, Wu-Hsing Street, Taipei, Taiwan.
| | - Haw-Ming Huang
- School of Dentistry, Taipei Medical University, 250, Wu-Hsing Street, Taipei, Taiwan. .,Graduate Institute of Biomedical Optomechatronics, Taipei Medical University, Taipei, Taiwan.
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Biomechanical Optimization of a Novel Circular External Fixator (Optimization of Circular External Fixator). J Med Biol Eng 2017. [DOI: 10.1007/s40846-017-0242-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Scarano A, Carinci F, Quaranta A, Iezzi G, Piattelli M, Piattelli A. Correlation between Implant Stability Quotient (ISQ) with Clinical and Histological Aspects of Dental Implants Removed for Mobility. Int J Immunopathol Pharmacol 2017; 20:33-6. [PMID: 17897499 DOI: 10.1177/039463200702001s08] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Dental implants are a successful treatment modality for missing teeth; however, failures do occur. These failures can occur early in the healing process after primary stability has been achieved at the time of implant placement, or after initial bone remodeling and new bone growth have taken place. The ability to detect implants that are failing or will fail is still not possible. The aim of the present study is to see if correlations exist between RFA values and histologic and histochemical evaluation of the human retrieved implants for failure. In a 5 year period, 37 root form implants were retrieved because of mobility and underwent histological examination. Thin ground sections were obtained from each implant. All the implants had been removed with a 5 mm trephine. In all cases a peri-implant radiolucency was present. Before implant retrieval, the implant stability was evaluated with Osstell (Integration Diagnostics AB, Gothenburg, Sweden). All the implants were not osseointegrated clinically and mobility was present. Radiographically, bone loss was observed around the implants and the mean ISQ values was 37 (+/- 2.7). A scarce inflammatory cell infiltrate was present in the connective tissue of some specimens. In about 10 percent of specimens, the epithelium tended to surround the total perimeter of the implant. These data suggest that implants with an ISQ<40 are irretrievably lost and there is no possibility to save them. A statistically significant correlation was found between an ISQ<36 and irretrievably failed implants.
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Affiliation(s)
- A Scarano
- Department of Stomatology and Oral Science, University of Chieti-Pescara, Chieti, Italy
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Monitoring the Changes of Material Properties at Bone-Implant Interface during the Healing Process In Vivo: A Viscoelastic Investigation. BIOMED RESEARCH INTERNATIONAL 2017; 2017:1945607. [PMID: 28373978 PMCID: PMC5360965 DOI: 10.1155/2017/1945607] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/13/2016] [Revised: 02/20/2017] [Accepted: 02/26/2017] [Indexed: 01/24/2023]
Abstract
The aim of this study was to monitor the changes of viscoelastic properties at bone-implant interface via resonance frequency analysis (RFA) and the Periotest device during the healing process in an experimental rabbit model. Twenty-four dental implants were inserted into the femoral condyles of rabbits. The animals were sacrificed immediately after implant installation or on day 14, 28, or 56 after surgery. Viscoelastic properties at bone-implant interface were evaluated by measuring the implant stability quotient (ISQ) using RFA and by measuring the Periotest values (PTVs) using the Periotest device. The bone/implant specimens were evaluated histopathologically and histomorphometrically to determine the degree of osseointegration (BIC%). The BIC% values at different time points were then compared with the corresponding ISQ values and PTVs. The mean ISQ value increased gradually and reached 81 ± 1.7 on day 56, whereas the mean PTV decreased over time, finally reaching −0.7 ± 0.5 on day 56. Significant correlations were found between ISQ and BIC% (r = 0.701, p < 0.001), PTV and BIC% (r = −0.637, p < 0.05), and ISQ and PTV (r = −0.68, p < 0.05). These results show that there is a positive correlation between implant stability parameters and peri-implant-bone healing, indicating that the RFA and Periotest are useful for measuring changes of viscoelastic properties at bone-implant interface and are reliable for indirectly predicting the degree of osseointegration.
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Kuo TF, Lu HC, Tseng CF, Yang JC, Wang SF, Yang TCK, Lee SY. Evaluation of Osseointegration in Titanium and Zirconia-Based Dental Implants with Surface Modification in a Miniature Pig Model. J Med Biol Eng 2017. [DOI: 10.1007/s40846-017-0230-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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15
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Effects on the torsional vibration behavior in the investigation of dental implant osseointegration using resonance frequency analysis: a numerical approach. Med Biol Eng Comput 2017; 55:1649-1658. [DOI: 10.1007/s11517-017-1612-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2016] [Accepted: 01/25/2017] [Indexed: 10/20/2022]
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Poort LJ, Kiewiet CC, Cleutjens JPM, Houben R, Hoebers FJP, Kessler PAWH. Osseointegration and implant stability of extraoral implants in Göttingen minipigs after irradiation. J Craniomaxillofac Surg 2016; 44:1842-1848. [PMID: 27697399 DOI: 10.1016/j.jcms.2016.08.019] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2016] [Revised: 07/19/2016] [Accepted: 08/24/2016] [Indexed: 11/15/2022] Open
Abstract
OBJECTIVES The aim of this study was to compare the influence of implant surface treatment and irradiation dose on implant stability and osseointegration of 144 extraoral implants in irradiated frontal bone of minipigs. MATERIAL AND METHODS 144 implants with 3 different surface treatments (machined, etched and HAVD-coated) were implanted in the frontal bone of 16 Göttingen minipigs. Three groups of four pigs received radiation with equivalent doses of 25, 50 and 70 Gy, and one group served as control. Resonance frequency analysis (RFA) was performed recording Implant Stability Quotients (ISQ) at implant placement and 3 months thereafter. Removal torque was measured whilst removing specific implants after 3 months. In addition, the bone-to-implant contact (BIC) was analyzed. RESULTS Evaluation of ISQ, BIC-values showed no significant difference between the different surface treatments in irradiated and non-irradiated bone. Removal torque revealed statistically significant differences between machined and HAVD-coated implants in the irradiated bone. CONCLUSIONS Implant stability and osseointegration, based on Removal Torque showed significant higher results for the HAVD-coated implants. No significant difference was observed between the irradiated and non-irradiated animals. This study shows that HAVD-coated extraoral implants can potentially be used for craniofacial rehabilitation in non-irradiated and irradiated bone.
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Affiliation(s)
- Lucas J Poort
- Department of Cranio-Maxillofacial Surgery and GROW School for Oncology and Developmental Biology, Maastricht University Medical Centre, Maastricht, The Netherlands.
| | - Charlotte C Kiewiet
- Department of Cranio-Maxillofacial Surgery, Maastricht University Medical Centre, Maastricht, The Netherlands
| | - Jack P M Cleutjens
- Department of Pathology and CARIM School for Cardiovascular, Maastricht University Medical Centre, Maastricht, The Netherlands
| | - Ruud Houben
- Department of Radiation Oncology (Maastro Clinic) and GROW School for Oncology and Developmental Biology, Maastricht University Medical Centre, Maastricht, The Netherlands
| | - Frank J P Hoebers
- Department of Radiation Oncology (Maastro Clinic) and GROW School for Oncology and Developmental Biology, Maastricht University Medical Centre, Maastricht, The Netherlands
| | - Peter A W H Kessler
- Department of Cranio-Maxillofacial Surgery and GROW School for Oncology and Developmental Biology, Maastricht University Medical Centre, Maastricht, The Netherlands
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Gehrke SA, Guirado JLC, Bettach R, Fabbro MD, Martínez CPA, Shibli JA. Evaluation of the insertion torque, implant stability quotient and drilled hole quality for different drill design: an in vitro Investigation. Clin Oral Implants Res 2016; 29:656-662. [PMID: 26957224 DOI: 10.1111/clr.12808] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/24/2016] [Indexed: 11/29/2022]
Abstract
OBJECTIVE The purpose of the present study was to compare the insertion torque and implant stability quotient between different drill design for implant site preparation. MATERIALS AND METHODS Synthetic blocks of bone (type I density) were used for drilling procedures. Three groups were evaluated: Group G1 - drilling with a single bur for a 4.2 mm conical implant; Group G2 and Group G3 - drilling with three consecutive burs for a 4.1 mm cylindrical implant and for a 4.3 mm conical implant respectively. For each group, 15 drilling procedures were performed without irrigation for 10-mm in-depth. The drilled hole quality (HQ) after the osteotomy for implant site preparation was measured in the five-first holes through a fully automated roundness/cylindricity instrument at three levels (top, middle, and bottom of the site). The insertion torque value (ITV) was achieved with a computed torquimeter and the implant stability quotient (ISQ) values were measured using a resonance frequency apparatus. RESULTS The single drill (group 1) achieved a significantly higher ITV and ISQ than the multiple drills for osteotomy (groups 2 and 3). Group 1 and 3 displayed significantly better HQ than group 2. CONCLUSIONS Within the limitations of the study, the results suggest that the hole quality, in addition to the insertion torque, may significantly affect implant primary stability.
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Affiliation(s)
- Sergio Alexandre Gehrke
- Department of Research Biotecnos - Technology and Science, Santa Maria Brazil, Catholic University San Anotnio of Murcia, Murcia, Spain
| | - José Luis Calvo Guirado
- Chairman of International Research Cathedra, Universidad Católica San Antonio de Murcia (UCAM), Murcia, Spain
| | - Raphaël Bettach
- Adjunct Associate Professor New York University, New York, USA
| | - Massimo Del Fabbro
- Academic Researcher, Università degli Studi di Milano, Director of the Research Center in Oral Health, Department of Biomedical, Surgical and Dental Sciences, IRCCS Istituto Ortopedico Galeazzi, Milano, Italy
| | - Carlos Pérez-Albacete Martínez
- Associate Professor of International Research Cathedra, Universidad Católica San Antonio de Murcia (UCAM), Murcia, Spain
| | - Jamil Awad Shibli
- Department of Periodontology and Oral Implantology, Dental Research Division, University of Guarulhos, Guarulhos, SP, Brazil
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Nagayasu-Tanaka T, Nozaki T, Miki K, Sawada K, Kitamura M, Murakami S. FGF-2 promotes initial osseointegration and enhances stability of implants with low primary stability. Clin Oral Implants Res 2016; 28:291-297. [PMID: 26919334 PMCID: PMC5347960 DOI: 10.1111/clr.12797] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/24/2016] [Indexed: 11/30/2022]
Abstract
OBJECTIVES The aim of this study was to examine the effect of basic fibroblast growth factor (FGF-2) on osseointegration of dental implants with low primary stability in a beagle dog model. MATERIALS AND METHODS Customized titanium implants that were designed to have low contact with the existing bone were installed into the edentulous mandible of beagle dogs. To degrade the primary stability of the implants, the diameters of the bone sockets exceeded the implant diameters. FGF-2 (0.3%) plus vehicle (hydroxypropyl cellulose) or vehicle alone was topically applied to the sockets in the FGF-2 and control groups, respectively. In Study 1, the new bone area and length of new bone-to-implant contact (BIC) were evaluated at 4, 8, and 12 weeks after installation using histomorphometry and scanning electron microscopy. In Study 2, the implant stability quotient (ISQ) values were sequentially measured for 16 weeks using an Osstell system. RESULTS The histomorphometric analysis revealed that the new bone area and length of BIC in the FGF-2 group were significantly larger than those in the control group at 4 weeks. Electron microscopic observation showed intimate contact between the mature lamellar bone and the implant surfaces, osseointegration, in both groups. The ISQ values in the FGF-2 group were significantly increased from 6 to 16 weeks compared with those in the control group. CONCLUSIONS Taken together, our study demonstrates that FGF-2 promoted new bone formation around the dental implants and subsequent osseointegration, resulting in promotion of stability of implants with low primary stability.
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Affiliation(s)
- Toshie Nagayasu-Tanaka
- Pharmacology Department, Drug Research Center, Kaken Pharmaceutical Co. Ltd., Kyoto, Japan.,Department of Periodontology, Osaka University Graduate School of Dentistry, Osaka, Japan
| | - Takenori Nozaki
- Department of Periodontology, Osaka University Graduate School of Dentistry, Osaka, Japan
| | - Koji Miki
- Department of Periodontology, Osaka University Graduate School of Dentistry, Osaka, Japan
| | - Keigo Sawada
- Department of Periodontology, Osaka University Graduate School of Dentistry, Osaka, Japan
| | - Masahiro Kitamura
- Department of Periodontology, Osaka University Graduate School of Dentistry, Osaka, Japan
| | - Shinya Murakami
- Department of Periodontology, Osaka University Graduate School of Dentistry, Osaka, Japan
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Merheb J, Temmerman A, Rasmusson L, Kübler A, Thor A, Quirynen M. Influence of Skeletal and Local Bone Density on Dental Implant Stability in Patients with Osteoporosis. Clin Implant Dent Relat Res 2016; 18:253-60. [DOI: 10.1111/cid.12290] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Joe Merheb
- Unit of Periodontology, Department of Oral Health Sciences; University of Leuven; Leuven Belgium
| | - Andy Temmerman
- Unit of Periodontology, Department of Oral Health Sciences; University of Leuven; Leuven Belgium
| | - Lars Rasmusson
- Department of Oral and Maxillofacial Surgery; The Sahlgrenska Academy, University of Gothenburg; Gothenburg Sweden
| | - Alexander Kübler
- Department of Oral and Maxillofacial Plastic Surgery; University of Wuerzburg; Wuerzburg Germany
| | - Andreas Thor
- Department of Oral and Maxillofacial Surgery; Institute of Surgical Sciences, Uppsala University; Uppsala Sweden
| | - Marc Quirynen
- Unit of Periodontology, Department of Oral Health Sciences; University of Leuven; Leuven Belgium
- Research Group Periodontology & Oral microbiology, Department of Oral Health Sciences, University of Leuven; Leuven Belgium
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20
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Dias DR, Leles CR, Lindh C, Ribeiro-Rotta RF. Marginal bone level changes and implant stability after loading are not influenced by baseline microstructural bone characteristics: 1-year follow-up. Clin Oral Implants Res 2015; 27:1212-1220. [PMID: 26648053 DOI: 10.1111/clr.12728] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/17/2015] [Indexed: 11/29/2022]
Abstract
OBJECTIVE The aim of this study was to investigate the influence of different bone tissue characteristics of implant sites on changes in marginal bone level and implant stability over time. MATERIAL AND METHODS One hundred and one implants were inserted in 41 patients. Cortical bone thickness of the alveolar ridge was measured on computed tomography (CT) images. Histomorphometric and microtomographic analyses (microCT) were performed in bone specimens obtained by using a trephine bur, at first drilling. Implant stability quotient (ISQ) measured by resonance frequency analysis (RFA) was registered at implant insertion. Implant stability quotient was measured also at the stages of uncovering, loading and at the 1-year follow-up, when standardized periapical radiographs were taken to measure the marginal bone level (MBL). Descriptive statistics, Spearman's rho correlation and multiple linear regression were used for data analysis (P < 0.05). RESULTS Comparison between groups of higher and lower values of ISQ changes and between groups of higher and lower values of MBL changes revealed no differences in histomorphometric and microtomographic parameters, according to non-parametric comparison tests, (P > 0.05). Bivariate correlation also showed no association among these microstructural parameters and the outcomes evaluated. There was no correlation between cortical thickness and MBL changes (r = -0.029; P = 0.832) and between cortical thickness and ISQ changes (r = 0.145; P = 0.292). CONCLUSION Microstructural bone characteristics of implant sites have no effect on changes in marginal bone level and implant stability as measured by RFA. Bone morphology cannot predict implant treatment success over time.
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Affiliation(s)
- Danilo Rocha Dias
- Department of Oral Medicine, School of Dentistry, Federal University of Goias, Goiania, Goias, Brazil
| | - Cláudio Rodrigues Leles
- Department of Prevention and Oral Rehabilitation, School of Dentistry, Federal University of Goias, Goiania, Goias, Brazil
| | - Christina Lindh
- Department of Oral and Maxillofacial Radiology, Faculty of Odontology, Malmö University, Malmö, Sweden
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Monje A, Suarez F, Garaicoa CA, Monje F, Galindo-Moreno P, García-Nogales A, Wang HL. Effect of location on primary stability and healing of dental implants. IMPLANT DENT 2015; 23:69-73. [PMID: 24384740 DOI: 10.1097/id.0000000000000019] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
PURPOSE To study implant primary stability and bone healing using resonance frequency analysis in different anatomical locations 4 months after placement. MATERIAL AND METHODS Fifty-six partially edentulous patients restored by dental implants were included. Overall, 214 implants were placed without bone or soft tissue augmentation. All implants were placed with the same drilling protocol and implant insertion torque (35-40 N · cm). RESULTS The mean implant stability quotient (ISQ) value at baseline for all the locations was 75.4 mm (95% confidence interval, 74.20-76.59 mm). Higher ISQ values were found in the mandible. A significant difference between ISQ values of each location (P < 0.001) was identified. The mean values obtained showed an increase (3.4%) in all the locations, being greater in the posterior lower and upper maxillae (3.8%), whereas for the anterior maxilla, it was the least (1.5%) 4 months after healing. This increase was statistically significant in the posterior upper and lower maxillae (P < 0.001). CONCLUSION Higher implant stability was found in mandible compared with maxilla in both periods, immediately after insertion and 4 months later. Therefore, according to ISQ values, restoring implants immediately after insertion or after a healing period of 4 months represents safe time points.
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Affiliation(s)
- Alberto Monje
- *Resident, Graduate Periodontics, Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, MI. †Visiting Scholar, Graduate Periodontics, Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, MI. ‡Oral and Maxillofacial Surgeon, CICOM, Center of Implantology, Oral and Maxillofacial Surgery, Badajoz, Spain. §Adjunct Professor, Department of Mathematics, University of Extremadura, Badajoz, Spain. ‖Adjunct Professor, Department of Oral Surgery and Implant Dentistry, University of Granada, Granada, Spain. ¶Professor and Director, Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, MI
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Al-Juboori MJ, AbdulRahaman SB. The Effect of Flapless and Full-thickness Flap Techniques on Implant Stability During the Healing Period. Open Dent J 2015; 9:243-9. [PMID: 26312095 PMCID: PMC4541338 DOI: 10.2174/1874210601509010243] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2015] [Revised: 05/26/2015] [Accepted: 05/31/2015] [Indexed: 11/22/2022] Open
Abstract
Purpose :
When soft tissue flaps are reflected for implant placement, the blood supply from the periosteum to the bone is disrupted. The aim of this study was to compare the effects of the flapless (FL) and full-thickness flap (FT) techniques on implant stability. Methods : Nine patients received 22 implants. The implants were placed using the FL technique on the contralateral side of the jaw; the FT technique was used as the control technique. Resonance frequency analysis (RFA) was performed at the time of implant placement and at 6 and 12 weeks after implant placement. RFA values were compared between the FL and FT groups and between time intervals in the same group. Results : The median (interquartile range [IQR]) RFA values at the time of implant placement were 75.00 (15.00) for the FL technique and 75.00 (9.00) for the FT technique. At 6 weeks, the median (IQR) values were 79 (3.30) for the FL technique and 80 (12.70) for the FT technique. At 12 weeks, the median (IQR) values were 82.3 (3.30) for the FL technique and 82.6 (8.00) for the FT technique. There were no significant differences between the 2 techniques at the time of implant placement, after 6 weeks or after 12 weeks, with p values of 0.994, 0.789, and 0.959, respectively. There were significant differences between the RFA values at the time of implant placement and after 6 weeks for the FL technique (p=0.028) but not for the FT technique (p=0.091). There were also significant differences between the RFA values at 6 weeks and the RFA values at 12 weeks for the FL technique (p=0.007) and for the FT technique (p=0.003). Conclusion : Periosteum preservation during the FL procedure will speed up bone remodeling and result in early secondary implant stability as well as early loading.
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Luo X, Yang B, Sheng L, Chen J, Li H, Xie L, Chen G, Yu M, Guo W, Tian W. CAD based design sensitivity analysis and shape optimization of scaffolds for bio-root regeneration in swine. Biomaterials 2015; 57:59-72. [PMID: 25913251 DOI: 10.1016/j.biomaterials.2015.03.062] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2014] [Revised: 03/30/2015] [Accepted: 03/31/2015] [Indexed: 02/05/2023]
Abstract
Tooth root supports dental crown and bears occlusal force. While proper root shape and size render the force being evenly delivered and dispersed into jawbone. Yet it remains unclear what shape and size of a biological tooth root (bio-root), which is mostly determined by the scaffold geometric design, is suitable for stress distributing and mastication performing. Therefore, this study hypothesized scaffold fabricated in proper shape and size is better for regeneration of tooth root with approving biomechanical functional features. In this study, we optimized shape and size of scaffolds for bio-root regeneration using computer aided design (CAD) modeling and finite element analysis (FEA). Statical structural analysis showed the total deformation (TD) and equivalent von-mises stress (EQV) of the restored tooth model mainly concentrated on the scaffold and the post, in accordance with the condition in a natural post restored tooth. Design sensitivity analysis showed increasing the height and upper diameter of the scaffold can tremendously reduce the TD and EQV of the model, while increasing the bottom diameter of scaffold can, to some extent, reduce the EQV in post. However, increase on post height had little influence on the whole model, only slightly increased the native EQV stress in post. Through response surface based optimization, we successfully screened out the optimal shape of the scaffold used in tissue engineering of tooth root. The optimal scaffold adopted a slightly tapered shape with the upper diameter of 4.9 mm, bottom diameter of 3.4 mm; the length of the optimized scaffold shape was 9.4 mm. While the analysis also suggested a height of about 9 mm for a metal post with a diameter of 1.4 mm suitable for crown restoration in bio-root regeneration. In order to validate the physiological function of the shape optimized scaffold in vivo, we transplanted the shape optimized treated dentin matrix (TDM) scaffold, seeding with dental stem cells, into alveolar bone of swine and further installed porcelain crown. Results showed that tooth root has not only been successfully regenerated histologically but also performed masticatory function and maintained stable for three months after crown restoration. Our results suggested that TDM scaffold with 9.4 mm in length and 4.9 mm/3.4 mm in upper/bottom diameter is a suitable biological scaffold for tooth root regeneration. These results also provided a recommendable design protocol for fabricating other scaffolds in tooth root reconstruction.
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Affiliation(s)
- Xiangyou Luo
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, PR China; National Engineering Laboratory for Oral Regenerative Medicine, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, PR China; Department of Oral and Maxillofacial Surgery, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, PR China
| | - Bo Yang
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, PR China; National Engineering Laboratory for Oral Regenerative Medicine, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, PR China; Department of Oral and Maxillofacial Surgery, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, PR China
| | - Lei Sheng
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, PR China; National Engineering Laboratory for Oral Regenerative Medicine, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, PR China; Department of Oral and Maxillofacial Surgery, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, PR China
| | - Jinlong Chen
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, PR China; National Engineering Laboratory for Oral Regenerative Medicine, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, PR China; Department of Oral and Maxillofacial Surgery, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, PR China
| | - Hui Li
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, PR China; National Engineering Laboratory for Oral Regenerative Medicine, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, PR China; Department of Oral and Maxillofacial Surgery, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, PR China
| | - Li Xie
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, PR China; National Engineering Laboratory for Oral Regenerative Medicine, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, PR China
| | - Gang Chen
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, PR China; National Engineering Laboratory for Oral Regenerative Medicine, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, PR China; Department of Oral and Maxillofacial Surgery, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, PR China
| | - Mei Yu
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, PR China; National Engineering Laboratory for Oral Regenerative Medicine, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, PR China
| | - Weihua Guo
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, PR China; National Engineering Laboratory for Oral Regenerative Medicine, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, PR China; Department of Pedodontics, West China College of Stomatology, Sichuan University, No.14, 3rd Section, Renmin South Road, Chengdu 610041, PR China.
| | - Weidong Tian
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, PR China; National Engineering Laboratory for Oral Regenerative Medicine, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, PR China; Department of Oral and Maxillofacial Surgery, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, PR China.
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LaMalfa Ribolla E, Rizzo P. Modeling the electromechanical impedance technique for the assessment of dental implant stability. J Biomech 2015; 48:1713-20. [DOI: 10.1016/j.jbiomech.2015.05.020] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2014] [Revised: 04/22/2015] [Accepted: 05/14/2015] [Indexed: 11/30/2022]
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Yan X, Zhang X, Chi W, Ai H, Wu L. Comparing the influence of crestal cortical bone and sinus floor cortical bone in posterior maxilla bi-cortical dental implantation: a three-dimensional finite element analysis. Acta Odontol Scand 2015; 73:312-20. [PMID: 25330164 DOI: 10.3109/00016357.2014.967718] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
OBJECTIVE This study aimed to compare the influence of alveolar ridge cortical bone and sinus floor cortical bone in sinus areabi-cortical dental implantation by means of 3D finite element analysis. MATERIALS AND METHODS Three-dimensional finite element (FE) models in a posterior maxillary region with sinus membrane and the same height of alveolar ridge of 10 mm were generated according to the anatomical data of the sinus area. They were either with fixed thickness of crestal cortical bone and variable thickness of sinus floor cortical bone or vice versa. Ten models were assumed to be under immediate loading or conventional loading. The standard implant model based on the Nobel Biocare implant system was created via computer-aided design software. All materials were assumed to be isotropic and linearly elastic. An inclined force of 129 N was applied. RESULTS Von Mises stress mainly concentrated on the surface of crestal cortical bone around the implant neck. For all the models, both the axial and buccolingual resonance frequencies of conventional loading were higher than those of immediate loading; however, the difference is less than 5%. CONCLUSION The results showed that bi-cortical implant in sinus area increased the stability of the implant, especially for immediately loading implantation. The thickness of both crestal cortical bone and sinus floor cortical bone influenced implant micromotion and stress distribution; however, crestal cortical bone may be more important than sinus floor cortical bone.
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Affiliation(s)
- Xu Yan
- Department of Prosthodontics
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26
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Yan X, Zhang X, Chi W, Ai H, Wu L. Association between implant apex and sinus floor in posterior maxilla dental implantation: A three-dimensional finite element analysis. Exp Ther Med 2015; 9:868-876. [PMID: 25667644 PMCID: PMC4316907 DOI: 10.3892/etm.2015.2205] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2014] [Accepted: 12/22/2014] [Indexed: 11/18/2022] Open
Abstract
The aim of the present study was to evaluate the effect of the association between the implant apex and the sinus floor in posterior maxilla dental implantation by means of three-dimensional (3D) finite element (FE) analysis. Ten 3D FE models of a posterior maxillary region with a sinus membrane and different heights of alveolar ridge with different thicknesses of sinus floor cortical bone were constructed according to anatomical data of the sinus area. Six models were constructed with the same thickness of crestal cortical bone and a 1-mm thick sinus floor cortical bone, but differing heights of alveolar ridge (between 10 and 14 mm). The four models of the second group were similar (11-mm-high alveolar ridge and 1-mm-thick crestal cortical bone) but with a changing thickness of sinus floor cortical bone (between 0.5 and 2.0 mm). The standard implant model based on the Nobel Biocare® implant system was created by computer-aided design (CAD) software and assembled into the models. The materials were assumed to be isotropic and linearly elastic. An inclined force of 129 N was applied. The maximum von Mises stress, stress distribution, implant displacement and resonance frequencies were calculated using CAD software. The von Mises stress was concentrated on the surface of the crestal cortical bone around the implant neck with the exception of that for the bicortical implantation. For immediate loading, when the implant apex broke into or through the sinus cortical bone, the maximum displacements of the implant, particularly at the implant apex, were smaller than those in the other groups. With increasing depth of the implant apex in the sinus floor cortical bone, the maximum displacements decreased and the implant axial resonance frequencies presented a linear upward tendency, but buccolingual resonance frequencies were hardly affected. This FE study on the association between implant apex and sinus floor showed that having the implant apex in contact with, piercing or breaking through the sinus floor cortical bone benefited the implant stability, particularly for immediate loading.
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Affiliation(s)
- Xu Yan
- Department of Prosthodontics, School of Stomatology, China Medical University, Shenyang, Liaoning 110001, P.R. China
| | - Xinwen Zhang
- Center of Implant Dentistry, School of Stomatology, China Medical University, Shenyang, Liaoning 110001, P.R. China
| | - Weichao Chi
- School of Astronautics, Harbin Institute of Technology, Harbin, Heilongjiang 150001, P.R. China
| | - Hongjun Ai
- Department of Prosthodontics, School of Stomatology, China Medical University, Shenyang, Liaoning 110001, P.R. China
| | - Lin Wu
- Department of Prosthodontics, School of Stomatology, China Medical University, Shenyang, Liaoning 110001, P.R. China
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27
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Modified bone density-dependent orthotropic material model of human mandibular bone. Med Eng Phys 2014; 36:1684-92. [DOI: 10.1016/j.medengphy.2014.09.013] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2013] [Revised: 06/16/2014] [Accepted: 09/15/2014] [Indexed: 11/20/2022]
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Hajimiragha H, Abolbashari M, Nokar S, Abolbashari A, Abolbashari M. Bone Response From a Dynamic Stimulus on a One-Piece and Multi-Piece Implant Abutment and Crown by Finite Element Analysis. J ORAL IMPLANTOL 2014; 40:525-32. [DOI: 10.1563/aaid-joi-d-10-00170] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The present study was done to evaluate the effects of different types of abutments on the rate and distribution of stress on the bone surrounding the implant by dynamic finite element analysis method. In this study two ITI abutment models—one-piece and multi-piece—along with fixture, bone, and superstructure have been simulated with the help of company-made models. The maximum Von Mises stress (MVMS) was observed in the distobuccal area of the cortical bone near the crest of implant in two implant models. In the multi-piece abutment, MVMS was higher than the one-piece model (27.9 MPa and 23.3 MPa, respectively). Based on the results of this study, it can be concluded that type of abutment influences the stress distribution in the area surrounding the implant during dynamic loading.
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Affiliation(s)
- Habib Hajimiragha
- Department of Fixed Prosthodontics and Occlusion, Tehran University of Medical Sciences, Tehran, Iran
| | - Mohammadreza Abolbashari
- Department of Fixed Prosthodontics and Occlusion, International Campus of Tehran University of Medical Sciences, Tehran, Iran
| | - Saeed Nokar
- Department of Fixed Prosthodontics and Occlusion, International Campus of Tehran University of Medical Sciences, Tehran, Iran
| | | | - Mehrdad Abolbashari
- Center for Optoelectronics and Optical Communications, Center for Precision Metrology, University of North Carolina, Charlotte, NC
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Deli G, Petrone V, De Risi V, Tadic D, Zafiropoulos GG. Longitudinal implant stability measurements based on resonance frequency analysis after placement in healed or regenerated bone. J ORAL IMPLANTOL 2014; 40:438-47. [PMID: 25106008 DOI: 10.1563/aaid-joi-d-12-00014] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Primary stability is an indicator of subsequent osseointegration of dental implants. However, few studies have compared the implant stability among anatomical regions and bone types; thus, not enough data exist regarding the stability of implants placed in regenerated bone (RB). The present study evaluated primary and long-term stability of implants placed in RB and non-regenerated healed bone (HB). A total of 216 screw cylinder implants were placed in 216 patients (98 in HB and 118 in RB, 6 [RB6, N = 68] or 12 [RB12, N = 50] months after tooth extraction). Implant stability was evaluated using resonance frequency analysis (RFA) measured at the time of implant placement (E1), at the time of loading (4 months after placement, E2), and 4 months after loading (E3). Various clinically relevant measurements were obtained, such as implant diameter, length, and location, as well as bone quality. At E1, implant location, bone quality, and experimental group significantly affected implant stability (all at P < .05). At E2, implant location, diameter, length, and experimental group significantly affected implant stability (all at P < .05). At E3, bone quality, implant diameter, length, and experimental group significantly affected implant stability (all at P < .01). Stability for the RB12 group was significantly higher than all other corresponding values; further, the values did not change significantly over time. For the HB and RB6 groups, stability was significantly higher at E2 than at E1 (P < .001) and was no different between E2 and E3. Implant location, length, and experimental group were associated with these differences (all at P < .05). Compared with HB and RB6, higher implant stability may be achieved in regenerated bone 12 months post-extraction (RB12). This stability was achieved at E1 and maintained for at least 8 months. Variables such as implant length, diameter, and bone quality affected the stability differently over time. Implant stability varied in different anatomic regions and with regard to different healing processes in the bone.
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Affiliation(s)
- Giorgio Deli
- 1 Division of Periodontology, Catholic University of Sacre Cuore, A. Gemelli University Hospital, Rome, Italy
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Hernández-Cortés P, Monje A, Galindo-Moreno P, Catena A, Ortega-Oller I, Salas-Pérez J, Mesa F, Gómez-Sánchez R, Aguilar M, Aguilar D, O'Valle F. An ex vivo model in human femoral heads for histopathological study and resonance frequency analysis of dental implant primary stability. BIOMED RESEARCH INTERNATIONAL 2014; 2014:535929. [PMID: 24995307 PMCID: PMC4065718 DOI: 10.1155/2014/535929] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/21/2014] [Revised: 05/12/2014] [Accepted: 05/19/2014] [Indexed: 11/18/2022]
Abstract
OBJECTIVE This study was designed to explore relationships of resonance frequency analysis (RFA)-assessed implant stability (ISQ values) with bone morphometric parameters and bone quality in an ex vivo model of dental implants placed in human femoral heads and to evaluate the usefulness of this model for dental implant studies. MATERIAL AND METHODS This ex vivo study included femoral heads from 17 patients undergoing surgery for femoral neck fracture due to osteoporosis (OP) (n = 7) or for total prosthesis joint replacement due to severe hip osteoarthrosis (OA) (n = 10). Sixty 4.5 × 13 mm Dentsply Astra implants were placed, followed by RFA. CD44 immunohistochemical analysis for osteocytes was also carried out. RESULTS As expected, the analysis yielded significant effects of femoral head type (OA versus OA) (P < 0.001), but not of the implants (P = 0.455) or of the interaction of the two factors (P = 0.848). Bonferroni post hoc comparisons showed a lower mean ISQ for implants in decalcified (50.33 ± 2.92) heads than in fresh (66.93 ± 1.10) or fixated (70.77 ± 1.32) heads (both P < 0.001). The ISQ score (fresh) was significantly higher for those in OA (73.52 ± 1.92) versus OP (67.13 ± 1.09) heads. However, mixed linear analysis showed no significant association between ISQ scores and morphologic or histomorphometric results (P > 0.5 in all cases), and no significant differences in ISQ values were found as a function of the length or area of the cortical layer (both P > 0.08). CONCLUSION Although RFA-determined ISQ values are not correlated with morphometric parameters, they can discriminate bone quality (OP versus OA). This ex vivo model is useful for dental implant studies.
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Affiliation(s)
- Pedro Hernández-Cortés
- Department of Traumatology and Orthopedic Surgery, “San Cecilio” Clinical Hospital, University of Granada, Spain
| | - Alberto Monje
- Department of Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, MI, USA
| | - Pablo Galindo-Moreno
- Oral Surgery and Implant Dentistry Department, School of Dentistry, University of Granada, Granada, Spain
| | - Andrés Catena
- Department of Experimental Psychology, School of Psychology, University of Granada, Granada, Spain
| | - Inmaculada Ortega-Oller
- Oral Surgery and Implant Dentistry Department, School of Dentistry, University of Granada, Granada, Spain
| | - José Salas-Pérez
- Oral Surgery and Implant Dentistry Department, School of Dentistry, University of Granada, Granada, Spain
| | - Francisco Mesa
- Department of Periodontics, School of Dentistry, University of Granada, Granada, Spain
| | - Rafael Gómez-Sánchez
- Department of Traumatology and Orthopedic Surgery, “San Cecilio” Clinical Hospital, University of Granada, Spain
| | - Mariano Aguilar
- Department of Pathology, School of Medicine and Institute of Biopathology and Regenerative Medicine (IBIMER), University of Granada, Granada, Spain
| | - David Aguilar
- Department of Pathology, School of Medicine and Institute of Biopathology and Regenerative Medicine (IBIMER), University of Granada, Granada, Spain
| | - Francisco O'Valle
- Department of Pathology, School of Medicine and Institute of Biopathology and Regenerative Medicine (IBIMER), University of Granada, Granada, Spain
- Departamento de Anatomía Patológica, Facultad de Medicina, 18012 Granada, Spain
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Dias DR, Leles CR, Lindh C, Ribeiro-Rotta RF. The effect of marginal bone level changes on the stability of dental implants in a short-term evaluation. Clin Oral Implants Res 2014; 26:1185-90. [DOI: 10.1111/clr.12426] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/03/2014] [Indexed: 11/29/2022]
Affiliation(s)
- Danilo R. Dias
- Department of Oral Medicine; School of Dentistry; Federal University of Goias; Goiania Brazil
| | - Cláudio R. Leles
- Department of Prevention and Oral Rehabilitation; School of Dentistry; Federal University of Goias; Goiania Brazil
| | - Christina Lindh
- Department of Oral and Maxillofacial Radiology; Faculty of Odontology; Malmö University; Malmö Sweden
| | - Rejane F. Ribeiro-Rotta
- Department of Oral Medicine; School of Dentistry; Federal University of Goias; Goiania Brazil
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Han J, Hou J, Zhou G, Wang C, Fan Y. A histological and biomechanical study of bone stress and bone remodeling around immediately loaded implants. SCIENCE CHINA-LIFE SCIENCES 2014; 57:618-26. [PMID: 24824585 DOI: 10.1007/s11427-014-4657-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2013] [Accepted: 11/25/2013] [Indexed: 10/25/2022]
Abstract
Immediate loading (IL) increases the risk of marginal bone loss. The present study investigated the biomechanical response of peri-implant bone in rabbits after IL, aiming at optimizing load management. Ninety-six implants were installed bilaterally into femurs of 48 rabbits. Test implants on the left side created the maximal initial stress of 6.9 and 13.4 MPa in peri-implant bone and unloaded implants on the contralateral side were controls. Bone morphology and bone-implant interface strength were measured with histological examination and push-out testing during a 12-week observation period. Additionally, the animal data were incorporated into finite element (FE) models to calculate the bone stress distribution at different levels of osseointegration. Results showed that the stress was concentrated in the bone margin and the bone stress gradually decreased as osseointegration proceeded. A stress of about 2.0 MPa in peri-implant bone had a positive effect on new bone formation, osseointegration and bone-implant interface strength. Bone loss was observed in some specimens with stress exceeding 4.0 MPa. Data indicate that IL significantly increases bone stress during the early postoperative period, but the load-bearing capacity of peri-implant bone increases rapidly with an increase of bone-implant contact. Favorable bone responses may be continually promoted when the stress in peri-implant bone is maintained at a definite level. Accordingly, the progressive loading mode is recommended for IL implants.
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Affiliation(s)
- JingYun Han
- Key Lab for Biomechanics and Mechanobiology of Ministry of Education, School of Biological and Medical Engineering, Beihang University, Beijing, 100191, China
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Does Cone Beam Computed Tomography–Derived Bone Density Give Predictable Data About Stability Changes of Immediately Loaded Implants? J Craniofac Surg 2014; 25:e293-9. [DOI: 10.1097/scs.0000000000000727] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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Tang YL, Li B, Jin W, Li DH. Torsional resonance frequency analysis: a novel method for assessment of dental implant stability. Clin Oral Implants Res 2014; 26:615-22. [PMID: 24611966 DOI: 10.1111/clr.12350] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/19/2014] [Indexed: 12/01/2022]
Abstract
OBJECTIVES To establish and experimentally validate a novel resonance frequency analysis (RFA) method for measurement of dental implant stability by analyzing torsional resonance frequency (TRF). MATERIAL AND METHODS A numerical study and in vitro measurements were performed to evaluate the feasibility and reliability of the method of torsional RFA (T-RFA) using a T-shaped bilateral cantilever beam transducer. The sensitivity of this method was assessed by measuring the TRFs of dental implants with 8 sizes of T-shaped transducers during polymerization, which simulated the process of bone healing around an implant. The TRFs of the test implants detected using this new method and the bending resonance frequencies (BRFs) measured by Osstell(®) ISQ were compared. TRFs and BRFs on implant models in polymethyl methacrylate (PMMA) blocks with three exposure heights were also measured to assess the specificity of this method. RESULTS Finite element analysis showed two bending modes (5333 and 6008 Hz) following a torsional mode (8992 Hz) in the lower rank frequency. During in vitro measurements, a bending formant (mean 6075 Hz) and a torsional formant (mean 10225 Hz) appeared, which were verified by multipoint measurement with invariable excitation frequency in the laboratory. In the self-curing resin experiments, the average growth rate at all time points of TRFs using the new method with Transducer II was 2.36% and that of BRFs using Osstell(®) ISQ was 1.97%. In the implant exposure height tests, the mean declined rate of TRFs was 2.06% and that of BRFs using Osstell(®) ISQ was 12.34%. CONCLUSION A novel method for assessment of implant stability through TRF was established using a T-shape transducer, which showed high reliability and sensibility. The method alleviated the effects of implant exposure height on the measurements compared with Osstell(®) ISQ. The application of T-RFA represents another way in the investigation of dental implant osseointegration.
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Affiliation(s)
- Yu-Long Tang
- Department of Oral Implants, School of Stomatology, The Fourth Military Medical University, Xi'an, China
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Manresa C, Bosch M, Echeverría JJ. The comparison between implant stability quotient and bone-implant contact revisited: an experiment in Beagle dog. Clin Oral Implants Res 2013; 25:1213-1221. [PMID: 24102812 DOI: 10.1111/clr.12256] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/04/2013] [Indexed: 11/28/2022]
Abstract
BACKGROUND Resonance frequency analysis (RFA) is applied clinically for the assessment of implant stability, and the relevance of this application is widely accepted. However, the relationship between resonance frequency (RF) and other parameters of implant stability, such as the histomorphometrical bone-to-implant contact (BIC) parameter, has become controversial in the last decade. OBJECTIVE To analyse and clarify the controversial relationship between RF and histomorphometrical BIC measurements. MATERIAL AND METHODS A total of 36 dental implants (9 mm length, Ø 4.0 mm; Biohorizons(®) Implant Systems Inc., Birmingham, AL, USA) with a soluble blasting media (sandblasting with soluble particles) surface were implanted in six beagle dog mandibles. RFA assessments were performed with a magnetic Osstel Mentor(®) device at the time of implant installation, and during the monitoring period at weeks 1, 2, 4, 6 and 8, before implant retrieval. The dogs were sacrificed and the implants were removed in block after 8, 6, 4, 2, 1 and 0 weeks, respectively. One group was obtained at time 0, immediately after the implantation. The samples were embedded in methyl methacrylate polymers (Technovit(®) ) and cut along their long axis. BIC values were assessed by a non-subjective and systematic method based on backscattered scanning electron microscopy (BS-SEM) images. BIC% at the different time points was compared with the corresponding implant stability quotient (ISQ) values of the RFA assessment. RESULTS No statistically significant correlation between BIC and ISQ values (Osstell Mentor(®) ) was identified. The absence of a relationship between these two parameters is in agreement with several previous studies in humans and experimental animals. CONCLUSIONS The lack of correlation between BIC and ISQ values suggests that ISQ as determined by RFA is not able to identify the relationship between RF and histomorphometrical data.
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Affiliation(s)
- Carolina Manresa
- Departament d'Odontoestomatologia, Odontologia Integrada d'Adults, Facultat d'Odontologia, Campus de Bellvitge, Universitat de Barcelona, Barcelona, Spain
| | - Manel Bosch
- Unitat de Microscòpia Òptica Avançada, Centres Científics i Tecnològics de la Universitat de Barcelona (CCiTUB), Barcelona, Spain
| | - José J Echeverría
- Departament d'Odontoestomatologia, Odontologia Integrada d'Adults, Facultat d'Odontologia, Campus de Bellvitge, Universitat de Barcelona, Barcelona, Spain
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The correlation between crestal bone resorption and implant stability during healing period using resonance frequency analysis. IMPLANT DENT 2013; 22:351-5. [PMID: 23811720 DOI: 10.1097/id.0b013e318296583d] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
PURPOSE To detect the correlation between crestal bone resorption and implant stability during healing period using resonance frequency analysis (RFA). MATERIALS AND METHODS Twenty-two International Team for Implantology Straumann implants were placed in the posterior maxilla or mandible in 9 patients. RFA reading was taken immediately after implant placement. Periapical radiographs were taken, and the distance from the shoulder of the healing cap to the first bone-implant contact was measured, and the average mesial and distal distances were taken. Patients were followed up at 6 and 12 weeks for data collection. RESULTS At 6 weeks, the correlation between crestal bone resorption and implant stability was significant (Spearman correlation test, P < 0.05) and negative correlation coefficient (r) was -0.522. At 12 weeks, the correlation between crestal bone resorption and implant stability was not significant (Spearman correlation test, P > 0.05) and negative correlation coefficient (r) was -0.119. CONCLUSIONS There was a significant negative correlation between the crestal bone resorption and implant stability at 6 weeks, whereas the negative correlations between the crestal bone resorption and implant stability at 12 weeks were nonsignificant.
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Salimov F, Tatli U, Kürkçü M, Akoğlan M, Oztunç H, Kurtoğlu C. Evaluation of relationship between preoperative bone density values derived from cone beam computed tomography and implant stability parameters: a clinical study. Clin Oral Implants Res 2013; 25:1016-21. [PMID: 23772811 DOI: 10.1111/clr.12219] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/16/2013] [Indexed: 12/29/2022]
Abstract
OBJECTIVES The aim of this study was to explore the efficacy of bone density value derived from cone beam computed tomography (CBCT) by evaluating its correlation with implant stability parameters including insertion torque value (ITV) and radiofrequency analysis in relation to different clinical variables including location, gender, age, bone quality, and implant diameter. MATERIAL AND METHODS A total of 65 implants were placed in 17 patients. The bone densities of implant recipient sites were preoperatively recorded using CBCT. Bone quality was subjectively assessed, which depends on the stiffness of the jawbone according to the Lekholm and Zarb index during drilling procedure. The maximum ITV of each implant was recorded using a digital torque meter during implant placement. Resonance frequency measurements were taken using an Osstell Mentor immediately after implant placement. Data were analyzed statistically. RESULTS The mean bone density, insertion torque, and implant stability quotient values of all implants were 556 ± 80, 37.4 ± 3.3 Ncm, and 73.8 ± 7.2, respectively. Statistically significant correlations were found between bone density values from CBCT and implant stability parameters in relation to all variables. CONCLUSION Bone density assessment using CBCT is an efficient method and significantly correlated with implant stability parameters and Lekholm and Zarb index. Thus, it is possible to predict initial implant stability and possibility of immediate or early loading using CBCT scans prior to implant placement.
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Affiliation(s)
- Fariz Salimov
- Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Çukurova University, Adana, Turkey
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Pan MC, Zhuang HB, Chen CS, Wu JW, Lee SY. A noncontact resonance frequency detection technique for the assessment of the interfacial bone defect around a dental implant. Med Eng Phys 2013; 35:1825-30. [PMID: 23764430 DOI: 10.1016/j.medengphy.2013.05.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2012] [Revised: 04/24/2013] [Accepted: 05/12/2013] [Indexed: 11/17/2022]
Abstract
This study employed a noncontact resonance frequency (RF) detection technique that was developed by our group to evaluate the interfacial bone in in vitro implant-bone models. Based on our method, the implant-bone structure was excited by the acoustic energy of a loudspeaker, and its vibration response was acquired with a capacitance sensor. The spectral analysis was used to characterize the first RF value. Two types of in vitro defect models, Buccal-Lingual (BL) and Mesial-Distal (MD), were constructed for the verification. The measurements of the RF for a defect model clamped at four different heights (9, 10, 11, and 12 mm) were performed in two sensing directions (BL and MD). Moreover, each model was also analyzed using an Osstell Mentor. The obtained two parameters, RF and ISQ (Implant Stability Quotient), were statistically analyzed through one-way analysis of variance (ANOVA) and linear regression analysis for comparisons. The RF and the ISQ values obtained for all of the defect models at the four clamp heights decreased significantly (p < 0.05) with an increase in the severity of the defect. The two parameters for each imperfection increase significantly (p < 0.05) with an increase in the clamp height. Additionally, the RFs of all of the defect models are linearly correlated with their corresponding ISQs for the four clamp heights and the two measuring orientations. Therefore, our developed technique is feasible for the assessment of the postoperative healing around a dental implant.
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Affiliation(s)
- Min-Chun Pan
- Graduate Institute of Biomedical Engineering, National Central University, Jhongli, Taiwan; Department of Mechanical Engineering, National Central University, Jhongli, Taiwan.
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Shokri M, Daraeighadikolaei A. Measurement of primary and secondary stability of dental implants by resonance frequency analysis method in mandible. Int J Dent 2013; 2013:506968. [PMID: 23737790 PMCID: PMC3666244 DOI: 10.1155/2013/506968] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2012] [Revised: 04/15/2013] [Accepted: 04/15/2013] [Indexed: 11/17/2022] Open
Abstract
Background. There is no doubt that the success of the dental implants depends on the stability. The aim of this work was to measure the stability of dental implants prior to loading the implants, using a resonance frequency analysis (RFA) by Osstell mentor device. Methods. Ten healthy and nonsmoker patients over 40 years of age with at least six months of complete or partial edentulous mouth received screw-type dental implants by a 1-stage procedure. RFA measurements were obtained at surgery and 1, 2, 3, 4, 5, 7, and 11 weeks after the implant surgery. Results. Among fifteen implants, the lowest mean stability measurement was for the 4th week after surgery in all bone types. At placement, the mean ISQ obtained with the magnetic device was 77.2 with 95% confidence interval (CI) = 2.49, and then it decreased until the 4th week to 72.13 (95% CI = 2.88), and at the last measurement, the mean implant stability significantly (P value <0.05) increased and recorded higher values to 75.6 (95% CI = 1.88), at the 11th week. Conclusions. The results may be indicative of a period of time when loading might be disadvantageous prior to the 4th week following implant placement. These suggestions need to be further assessed through future studies.
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40
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Monje A, Monje F, Suarez F, González-García R, Villanueva-Alcojol L, Garcia-Nogales A, Galindo-Moreno P, Wang HL. Comparison of implant primary stability between maxillary edentulous ridges receiving intramembranous origin block grafts. Med Oral Patol Oral Cir Bucal 2013; 18:e449-54. [PMID: 23385512 PMCID: PMC3668872 DOI: 10.4317/medoral.18732] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2012] [Accepted: 11/19/2012] [Indexed: 11/17/2022] Open
Abstract
Purpose: The purposes of the present study were: to compare the resonance frequency analysis (RFA) values of implant placed in either ramus or calvaria block grafts; and to determine if implant diameter influences RFA implant stability quotient (ISQ) value.
Material and Methods: This was a retrospective study that included 16 consecutives healthy patients treated with autogenous onlay block grafts for horizontal bone reconstruction in maxilla. Ten ramus and ten calvaria block graft treated patients were selected and compared.
Results: Totally, 59 implants were placed, 35 (59.3%) were placed on the calvaria bone grafts and the remaining 24 (40.7%) were on the ramus bone graft. Of all the implants studied, 13 (22%), 35 (59.3%), and 11 (18.6%) were 10 mm, 11.5 mm and 13 mm in length respectively. Regarding the diameter, 4 (7%) were 3.3 mm, 3 (5%) were 3.5 mm, 20 (34%) were 3.7 mm and 32 (54%) were 4 mm. Mean ISQ value obtained by RFA was 73.06 ± 6.08, being 72.19 ± 6 and 74.47 ± 6.06 for the calvaria and ramus treated group respectively. No significant differences were noted between the two groups (p= 0.154). Implants were pooled and divided by their diameter. Mean ISQ value obtained for 3.3 mm was 80 ± 5.09, while for 4.0 mm was 72.5 ± 7.19. Again, no significant differences were found among the groups (p= 0.138).
Conclusion: For RFA ISQ value, the bone graft origins (calvaria or ramus) or implant diameters did not influence the outcome.
Key words:Bone augmentation, dental implant, resonance frequency analysis, implant stability.
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Affiliation(s)
- Alberto Monje
- Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, MI, USA.
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Oh JS, Kim SG. Clinical study of the relationship between implant stability measurements using Periotest and Osstell mentor and bone quality assessment. Oral Surg Oral Med Oral Pathol Oral Radiol 2013; 113:e35-40. [PMID: 22669155 DOI: 10.1016/j.tripleo.2011.07.003] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2011] [Revised: 06/03/2011] [Accepted: 07/05/2011] [Indexed: 11/24/2022]
Abstract
OBJECTIVES The purpose of this study was to evaluate the relationship between subjective bone quality assessments and objective implant stability values using Periotest and Osstell Mentor, which are widely used clinically, to assess the correlation between these 2 measurements. STUDY DESIGN A total of 211 dental implants (114 in the maxilla and 97 in the mandible) were placed in 162 patients (89 males and 73 females). Bone quality type was classified according to the Lekholm and Zarb classification. After implant placement, implant stability was measured using Periotest and Osstell Mentor. Implant stability was represented by the implant stability quotient (ISQ) values and periotest values (PTVs). All of the procedures were performed by 1 operator to reduce potential errors. RESULTS The ISQ values were higher in the mandible (72.77 ± 8.77) than in the maxilla (65.72 ± 8.65), whereas PTVs were lower in the mandible (-3.02 ± 2.63) than in the maxilla (-0.17 ± 2.82). A statistically significant correlation was found between bone quality type and both ISQ values and PTVs. A significant negative correlation was found between the ISQ values and PTVs (P < .01). CONCLUSION Both measurements seem to be useful in predicting implant placement prognosis and in determining loading protocols.
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Affiliation(s)
- Ji-Su Oh
- Department of Oral & Maxillofacial Surgery, School of Dentistry, Chosun University, Gwangju, Republic of Korea
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Monje A, Monje F, Galindo-Moreno P, Montanero-Fernandez J, Suarez F, Wang HL. Microstructural and densiometric analysis of extra oral bone block grafts for maxillary horizontal bone augmentation: a comparison between calvarial bone and iliac crest. Clin Oral Implants Res 2013; 25:659-64. [DOI: 10.1111/clr.12159] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/07/2013] [Indexed: 11/29/2022]
Affiliation(s)
- Alberto Monje
- Department of Periodontics and Oral Medicine; University of Michigan School of Dentistry; Ann Arbor MI USA
| | - Florencio Monje
- Oral and Maxillofacial Surgeon; CICOM; Center of Implantology; Oral and Maxillofacial Surgery; Badajoz Spain
| | - Pablo Galindo-Moreno
- Department of Oral Surgery and Implantology; University of Granada; Granada Spain
| | | | - Fernando Suarez
- Department of Periodontics and Oral Medicine; University of Michigan School of Dentistry; Ann Arbor MI USA
| | - Hom-Lay Wang
- Department of Periodontics and Oral Medicine; University of Michigan School of Dentistry; Ann Arbor MI USA
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Guler AU, Sumer M, Duran I, Sandikci EO, Telcioglu NT. Resonance Frequency Analysis of 208 Straumann Dental Implants During the Healing Period. J ORAL IMPLANTOL 2013; 39:161-7. [DOI: 10.1563/aaid-joi-d-11-00060] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The most important prerequisite for the success of an osseointegrated dental implant is achievement and maintenance of implant stability. The aim of the study was to measure the 208 Straumann dental implant stability quotient (ISQ) values during the osseointegration period and determine the factors that affect implant stability. A total of 164 of the implants inserted were standard surface, and 44 of them were SLActive surface. To determine implant stability as ISQ values, measurements were performed at the stage of implant placement and healing periods by the Osstell mentor. The ISQ value ranges showed a significant increase during the healing period. Except for the initial measurement, the posterior maxilla had the lowest ISQ values, and there was no significant difference among anterior mandible, posterior mandible, and anterior maxilla (P < .05). Implant length did not have a significant influence on ISQ value (P > .05). The second measurement was significantly higher in men compared with women (P < .05). The second measurement was significantly higher than the others at 4.8 mm, and for the final measurement, there were no significant differences between 4.8 and 4.1 mm, which were higher than 3.3 mm (P < .05). When comparing sandblasted, large-grit, acid-etched (SLA) and SLActive surface implants, there were no significant differences for insertion measurements, but for second measurements, SLActive was significantly higher (P = 0), and for the final measurement, there was no significant difference. It appears that repeated ISQ measurements of a specific implant have some diagnostic benefit, and the factors that affect implant stability during the healing period are presented.
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Affiliation(s)
- Ahmet Umut Guler
- Department of Prosthodontics, Faculty of Dentistry, Istanbul Aydın University, Istanbul, Turkey
| | - Mahmut Sumer
- Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Ondokuz Mayıs University, Samsun, Turkey
| | - Ibrahim Duran
- Department of Prosthodontics, Faculty of Dentistry, Ondokuz Mayıs University, Samsun, Turkey
| | - Elif Ozen Sandikci
- Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Ondokuz Mayıs University, Samsun, Turkey
| | - Nazife Tuba Telcioglu
- Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Ondokuz Mayıs University, Samsun, Turkey
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Bayarchimeg D, Namgoong H, Kim BK, Kim MD, Kim S, Kim TI, Seol YJ, Lee YM, Ku Y, Rhyu IC, Lee EH, Koo KT. Evaluation of the correlation between insertion torque and primary stability of dental implants using a block bone test. J Periodontal Implant Sci 2013; 43:30-6. [PMID: 23508040 PMCID: PMC3596632 DOI: 10.5051/jpis.2013.43.1.30] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2012] [Accepted: 01/18/2013] [Indexed: 11/08/2022] Open
Abstract
PURPOSE Implant stability at the time of surgery is crucial for the long-term success of dental implants. Primary stability is considered of paramount importance to achieve osseointegration. The purpose of the present study was to investigate the correlation between the insertion torque and primary stability of dental implants using artificial bone blocks with different bone densities and compositions to mimic different circumstances that are encountered in routine daily clinical settings. METHODS In order to validate the objectives, various sized holes were made in bone blocks with different bone densities (#10, #20, #30, #40, and #50) using a surgical drill and insertion torque together with implant stability quotient (ISQ) values that were measured using the Osstell Mentor. The experimental groups under evaluation were subdivided into 5 subgroups according to the circumstances. RESULTS In group 1, the mean insertion torque and ISQ values increased as the density of the bone blocks increased. For group 2, the mean insertion torque values decreased as the final drill size expanded, but this was not the case for the ISQ values. The mean insertion torque values in group 3 increased with the thickness of the cortical bone, and the same was true for the ISQ values. For group 4, the mean insertion torque values increased as the cancellous bone density increased, but the correlation with the ISQ values was weak. Finally, in group 5, the mean insertion torque decreased as the final drill size increased, but the correlation with the ISQ value was weak. CONCLUSIONS Within the limitations of the study, it was concluded that primary stability does not simply depend on the insertion torque, but also on the bone quality.
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Affiliation(s)
- Dorjpalam Bayarchimeg
- Department of Periodontology, Dental Research Institute, Seoul National University School of Dentistry, Seoul, Korea
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Abstract
Osseointegration, defined as a direct structural and functional connection between ordered, living bone and the surface of a load-carrying implant, is critical for implant stability, and is considered a prerequisite for implant loading and long-term clinical success of end osseous dental implants. The implant-tissue interface is an extremely dynamic region of interaction. This complex interaction involves not only biomaterial and biocompatibility issues but also alteration of mechanical environment. The processes of osseointegration involve an initial interlocking between alveolar bone and the implant body, and later, biological fixation through continuous bone apposition and remodeling toward the implant. The process itself is quite complex and there are many factors that influence the formation and maintenance of bone at the implant surface. The aim of this present review is to analysis the current understanding of clinical assessments and factors that determine the success & failure of osseointegrated dental implants.
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Ribeiro-Rotta RF, de Oliveira RCG, Dias DR, Lindh C, Leles CR. Bone tissue microarchitectural characteristics at dental implant sites part 2: correlation with bone classification and primary stability. Clin Oral Implants Res 2012; 25:e47-53. [DOI: 10.1111/clr.12046] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/08/2012] [Indexed: 11/30/2022]
Affiliation(s)
| | | | - Danilo Rocha Dias
- Department of Oral Medicine; School of Dentistry; Federal University of Goias; Goiania Goias Brazil
| | - Christina Lindh
- Department of Oral and Maxillofacial Radiology; Faculty of Odontology; Malmö University; Malmö Sweden
| | - Cláudio Rodrigues Leles
- Department of Prevention and Oral Rehabilitation; School of Dentistry; Federal University of Goias; Goiania Goias Brazil
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Cano J, Campo J. Bone implant sockets made using three different procedures: a stability study in dogs. J Clin Exp Dent 2012; 4:e217-20. [PMID: 24558558 PMCID: PMC3917627 DOI: 10.4317/jced.50803] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2012] [Accepted: 04/08/2012] [Indexed: 12/03/2022] Open
Abstract
Objective: This study compared the effects of three different methods of preparing bone implant sockets (drilling, osteotomes, and piezoelectric device) on osseointegration using resonance frequency analysis (RFA).
Study Design: An experimental prospective study was designed.
Material and Methods: Ten adult beagle dogs were studied. After 5 weeks, 23 out of 28 initially placed implants in the iliac crest were evaluated, comparing these three different procedures of bone implant socket. Student’s t-test (paired, two-tailed) was used to reveal differences among the three groups at each time point (SPSS 16.0, IL, USA).
Results: After a 5-week healing period, the implants placed in sockets that were made using an osteotome or piezoelectric device were slightly more stable than those made by drilling. Reduced mechanical and heat injury to the bone is beneficial for maintaining and improving stability during the critical early healing period.
Conclusion: Using RFA, there was evidence of a slight increase in implant stability in the iliac crest after 5 weeks of healing when the implant socket was made using a piezoelectric device or expansion procedure as compare with the drilling method.
Key words:Bone implant sockets, drilling, osteotomes, piezoelectric, resonance frequency analysis, stability.
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Affiliation(s)
- Jorge Cano
- DDS, MSc, PhD, Lecturer. Department of Buccofacial Medicine and Surgery. School of Dentistry, Complutense University of Madrid. Spain
| | - Julián Campo
- DDS, PhD, Lecturer. Department of Buccofacial Medicine and Surgery. School of Dentistry, Complutense University of Madrid. Spain
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Pan CY, Chou ST, Tseng YC, Yang YH, Wu CY, Lan TH, Liu PH, Chang HP. Influence of different implant materials on the primary stability of orthodontic mini-implants. Kaohsiung J Med Sci 2012; 28:673-8. [PMID: 23217360 DOI: 10.1016/j.kjms.2012.04.037] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2011] [Accepted: 12/21/2011] [Indexed: 10/28/2022] Open
Abstract
This study evaluates the influence of different implant materials on the primary stability of orthodontic mini-implants by measuring the resonance frequency. Twenty-five orthodontic mini-implants with a diameter of 2 mm were used. The first group contained stainless steel mini-implants with two different lengths (10 and 12 mm). The second group included titanium alloy mini-implants with two different lengths (10 and 12 mm) and stainless steel mini-implants 10 mm in length. The mini-implants were inserted into artificial bones with a 2-mm-thick cortical layer and 40 or 20 lb/ft(3) trabecular bone density at insertion depths of 2, 4, and 6 mm. The resonance frequency of the mini-implants in the artificial bone was detected with the Implomates(®) device. Data were analyzed by two-way analysis of variance followed by the Tukey honestly significant difference test (α = 0.05). Greater insertion depth resulted in higher resonance frequency, whereas longer mini-implants showed lower resonance frequency values. However, resonance frequency was not influenced by the implant materials titanium alloy or stainless steel. Therefore, the primary stability of a mini-implant is influenced by insertion depth and not by implant material. Insertion depth is extremely important for primary implant stability and is critical for treatment success.
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Affiliation(s)
- Chin-Yun Pan
- Department of Orthodontics, Dental Clinics, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan
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Kunnekel AT, Nair KC, Naidu EM, Sivagami G. Validation of Resonance Frequency Analysis by Comparing Implant Stability Quotient Values With Histomorphometric Data. J ORAL IMPLANTOL 2011; 37:301-8. [DOI: 10.1563/aaid-joi-d-09-00137] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Abstract
The study was designed to determine the relationship between implant stability quotient (ISQ) values measured using resonance frequency analysis (RFA) and implant-bone distance measured histomorphometrically. Ten identical implants were equally divided into 2 groups based on primary stability at placement. Osteotomies were prepared in harvested goat femurs. ISQ values were measured and compared with implant-bone distance determined by micrometry. Based on the results, it was concluded that RFA can be used to measure implant stability reliably.
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Affiliation(s)
- Ashish Thomas Kunnekel
- Department of Prosthodontics, Maulana Azad Institute of Dental Sciences, New Delhi, India
| | - K. Chandrasekharan Nair
- Department of Prosthodontics, AECS Maaruti College of Dental Sciences and Research Centre, Bangalore, India
| | - E. Munirathnam Naidu
- Meenakshi Ammal Dental College, Meenakshi University, Chennai, Tamil Nadu, India
| | - Gomathinayagam Sivagami
- Department of Prosthodontics and Implantology, Meenakshi Ammal Dental College, Chennai, India
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Yoon HG, Heo SJ, Koak JY, Kim SK, Lee SY. Effect of bone quality and implant surgical technique on implant stability quotient (ISQ) value. J Adv Prosthodont 2011; 3:10-5. [PMID: 21503187 PMCID: PMC3076567 DOI: 10.4047/jap.2011.3.1.10] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2011] [Revised: 01/25/2011] [Accepted: 02/17/2011] [Indexed: 11/12/2022] Open
Abstract
PURPOSE This study investigated the influence of bone quality and surgical technique on the implant stability quotient (ISQ) value. In addition, the influence of interfacial bone quality, directly surrounding the implant fixture, on the resonance frequency of the structure was also evaluated by the finite element analysis. MATERIALS AND METHODS Two different types of bone (type 1 and type 2) were extracted and trimmed from pig rib bone. In each type of bone, the same implants were installed in three different ways: (1) Compaction, (2) Self-tapping, and (3) Tapping. The ISQ value was measured and analyzed to evaluate the influence of bone quality and surgical technique on the implant primary stability. For finite element analysis, a three dimensional implant fixture-bone structure was designed and the fundamental resonance frequency of the structure was measured with three different density of interfacial bone surrounding the implant fixture. RESULTS In each group, the ISQ values were higher in type 1 bone than those in type 2 bone. Among three different insertion methods, the Tapping group showed the lowest ISQ value in both type 1 and type 2 bones. In both bone types, the Compaction groups showed slightly higher mean ISQ values than the Self-tapping groups, but the differences were not statistically significant. Increased interfacial bone density raised the resonance frequency value in the finite element analysis. CONCLUSION Both bone quality and surgical technique have influence on the implant primary stability, and resonance frequency has a positive relation with the density of implant fixture-surrounding bone.
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Affiliation(s)
- Hong-Gi Yoon
- Department of Dentistry, School of Dentistry, Seoul National University, Seoul, Korea
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