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Gehrke SA, da Silva Neto UT, Rossetti PHO, Watinaga SE, Giro G, Shibli JA. Stability of implants placed in fresh sockets versus healed alveolar sites: Early findings. Clin Oral Implants Res 2015; 27:577-82. [PMID: 26037595 DOI: 10.1111/clr.12624] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/06/2015] [Indexed: 11/28/2022]
Abstract
OBJECTIVES The present study measured implant stability quotient (ISQ) values at three different time points after surgical procedures to compare whether the stability values differed between implants placed in fresh extraction sockets versus healed alveolar sites. MATERIALS AND METHODS To measure implant stability, resonance frequency analysis (RFA) was performed in 77 patients (53 women, 24 men) with a total of 120 dental implants. These implants were divided into two groups: Group 1 included 60 implants in healed alveolar sites (22 in the maxilla, 38 in the mandible), and Group 2 included 60 implants in fresh sockets (41 in the maxilla, 19 in the mandible). Implant stability was measured immediately at implant placement (baseline), 90, and 150 days later. Statistical analysis was made using a multivariate regression linear model at implant level (α = 0.05). RESULTS Overall, the means and standard deviations of the ISQ values were 62.7 ± 7.14 (95% confidence interval [CI], 39-88) at baseline, 70.0 ± 6.22 (95% CI, 46-88) at 90 days, and 73.4 ± 5.84 (95% CI, 58-88) at 150 days. In Group 1, the ISQs ranged between 64.3 ± 6.20 and 75.0 ± 5.69, while in Group 2, presented lower values that ranged between 61.2 ± 8.09 and 71.9 ± 5.99 (P = 0.002). Anatomic location and times periods were the only identified variables with an influence on ISQ values at implant level (P < 0.0001). CONCLUSIONS The stabilities of the implants placed in the fresh sockets and in healed sites exhibited similar evolutions in ISQ values and thus osseointegration; however, the implants in the healed alveolar sites exhibited superior values at all time points.
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Affiliation(s)
- Sergio Alexandre Gehrke
- Biotecnos Research Center, Santa Maria, Brazil.,Catholic University of Uruguay, Montevideo, Uruguay.,Department of Periodontology and Oral Implantology, Dental Research Division, University of Guarulhos, Guarulhos, Brazil
| | | | | | - Sidney Eiji Watinaga
- Department of Periodontology and Oral Implantology, Dental Research Division, University of Guarulhos, Guarulhos, Brazil
| | - Gabriela Giro
- Department of Periodontology and Oral Implantology, Dental Research Division, University of Guarulhos, Guarulhos, Brazil
| | - Jamil Awad Shibli
- Department of Periodontology and Oral Implantology, Dental Research Division, University of Guarulhos, Guarulhos, Brazil
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Anil S, Aldosari AA. Impact of Bone Quality and Implant Type on the Primary Stability: An Experimental Study Using Bovine Bone. J ORAL IMPLANTOL 2015; 41:144-8. [DOI: 10.1563/aaid-joi-d-11-00156] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The purpose of this in vitro study was to compare the primary stability and removal torque of bone level and tissue level implants in different bone qualities. Twenty tissue level and bone level implants (3.3 × 10 mm and 4.1 × 10 mm) were used for assessing the stability in type II and type IV bone. Forty bovine rib blocks were used in this study. The primary stability of the implant was measured by the resonance frequency using an Osstel device. The removal torque values (RTV) of the implants was assessed using a digital torque gauge instrument. The implant stability quotient (ISQ) values and the RTV showed a marginally higher stability with bone level implants as compared to tissue level implants. However, these differences were not statistically significant in both type of bone used (P > 0.05). On the other hand, compared to type IV, type II bone showed significant differences in the ISQ (P < 0.01) and RTV (P < 0.001) of bone level and tissue level implants. The study concluded that bone quality is an important factor in establishing primary stability than the implant dimension. Bone level and tissue level implants of same dimensions can be selected based on the esthetic demands since they showed similar mechanical properties.
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Affiliation(s)
- Sukumaran Anil
- Department of Periodontics and Community Dentistry, College of Dentistry, King Saud University, Riyadh, Saudi Arabia
| | - Abdullah Alfarraj Aldosari
- Department of Prosthetic Science, Dental Implant and Osseointegration Research Chair, College of Dentistry, King Saud University, Riyadh, Saudi Arabia
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Kim DG, Kwon HJ, Jeong YH, Chien HH, Crance S, Agnew AM, Battula S, Lee JW, Wen HB. Associations of Resonance Frequency Analysis with Dynamic Mechanical Analysis of Dental Implant Systems. Clin Implant Dent Relat Res 2015; 18:332-41. [PMID: 25810026 DOI: 10.1111/cid.12319] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
BACKGROUND Resonance frequency analysis (RFA) has been introduced as a noninvasive method to clinically estimate the stability of dental implant systems. PURPOSE The objective of this study was to examine whether implant stability quotient (ISQ) values of RFA can account for mechanical stability of the dental implant system, which is assessed using dynamic mechanical analysis (DMA). MATERIALS AND METHODS Fifty-seven screw-type titanium dental implants were placed in artificial polyurethane foams with seven different thicknesses (3.5 to 12 mm) and eight edentulous mandibles of human cadavers (four men and four women, 79.11 ± 13.48 years). After the ISQ values, insertion torque, and static stiffness of each implant system were measured, the DMA was performed to assess dynamic stiffness and viscoelastic tan δ. RESULTS The ISQ value had strong positive correlations with thickness, insertion torque, static and dynamic stiffness, and a negative correlation with tan δ of implant systems in artificial bone blocks (r = 0.769 to 0.992, p < .043). However, the ISQ value was correlated with only the insertion torque of implant systems in human mandibles (p < .049). CONCLUSION The ISQ values could reflect mechanical stability of the dental implant system under the controlled condition of homogeneous density in simple dimensions.
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Affiliation(s)
- Do-Gyoon Kim
- Division of Orthodontics, College of Dentistry, The Ohio State University, Columbus, OH, USA
| | - Hyun-Jung Kwon
- Division of Orthodontics, College of Dentistry, The Ohio State University, Columbus, OH, USA
| | - Yong-Hoon Jeong
- Division of Orthodontics, College of Dentistry, The Ohio State University, Columbus, OH, USA
| | - Hua-Hong Chien
- Division of Periodontology, College of Dentistry, The Ohio State University, Columbus, OH, USA
| | - Samantha Crance
- Division of Orthodontics, College of Dentistry, The Ohio State University, Columbus, OH, USA
| | - Amanda M Agnew
- Division of Anatomy, College of Medicine, The Ohio State University, Columbus, OH, USA
| | | | - Jin Whan Lee
- Dental Research, Zimmer Dental Inc., Carlsbad, CA, USA
| | - Hai Bo Wen
- Dental Research and Clinical Affairs, Zimmer Dental Inc., Carlsbad, CA, USA
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Howashi M, Tsukiyama Y, Ayukawa Y, Isoda-Akizuki K, Kihara M, Imai Y, Sogo M, Koyano K. Relationship between the CT Value and Cortical Bone Thickness at Implant Recipient Sites and Primary Implant Stability with Comparison of Different Implant Types. Clin Implant Dent Relat Res 2014; 18:107-16. [PMID: 25181581 DOI: 10.1111/cid.12261] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
BACKGROUND Studies have shown that bone quality at the implant recipient site can influence primary stability. PURPOSE The aims of this study were to explore the quantitative estimation of the primary stability of implants preoperatively using CT values and to examine the effect of different implant designs with recommended socket preparation on primary stability. MATERIALS AND METHODS Forty-four fresh porcine femoral heads were prepared. The bone surrounding implant sockets was preoperatively evaluated by helical CT. Forty-four implants (φ 4.3 × 10 mm), 22 straight and 22 tapered, were placed according to the manufacturer's instructions. The insertion torque value (ITV), implant stability quotient (ISQ), and removal torque value (RTV) were recorded as indicators of primary implant stability. RESULTS Significant correlations and linear relationships were found between the CT value and ITV, ISQ, and RTV for both straight and tapered implants (Spearman's correlation coefficient, p < .001; linear regression analysis, p < .01). Tapered implants had a significantly higher ITV than straight implants (analysis of covariance, p < .01). CONCLUSIONS Obtained results suggest that the primary stability of implants could be quantitatively estimated using the CT value preoperatively, indicating the CT value of bone surrounding an implant can contribute considerably to implant planning and design choice in clinical situations.
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Affiliation(s)
- Miori Howashi
- Division of Oral Rehabilitation, Faculty of Dental Science, Kyushu University, Fukuoka, Japan
| | - Yoshihiro Tsukiyama
- Division of Oral Rehabilitation, Faculty of Dental Science, Kyushu University, Fukuoka, Japan
| | - Yasunori Ayukawa
- Division of Oral Rehabilitation, Faculty of Dental Science, Kyushu University, Fukuoka, Japan
| | - Kei Isoda-Akizuki
- Division of Oral Rehabilitation, Faculty of Dental Science, Kyushu University, Fukuoka, Japan
| | - Masafumi Kihara
- Division of Oral Rehabilitation, Faculty of Dental Science, Kyushu University, Fukuoka, Japan
| | - Yu Imai
- Division of Oral Rehabilitation, Faculty of Dental Science, Kyushu University, Fukuoka, Japan
| | - Motofumi Sogo
- Division of Prosthodontics and Oral Rehabilitation, Osaka University Graduate School of Dentistry, Osaka, Japan
| | - Kiyoshi Koyano
- Division of Oral Rehabilitation, Faculty of Dental Science, Kyushu University, Fukuoka, Japan
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Troedhan A, Schlichting I, Kurrek A, Wainwright M. Primary implant stability in augmented sinuslift-sites after completed bone regeneration: a randomized controlled clinical study comparing four subantrally inserted biomaterials. Sci Rep 2014; 4:5877. [PMID: 25073446 PMCID: PMC5376201 DOI: 10.1038/srep05877] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2014] [Accepted: 07/01/2014] [Indexed: 02/07/2023] Open
Abstract
Implant-Insertion-Torque-Value (ITV) proved to be a significant clinical parameter to predict long term implant success-rates and to decide upon immediate loading. The study evaluated ITVs, when four different and commonly used biomaterials were used in sinuslift-procedures compared to natural subantral bone in two-stage-implant-procedures. The tHUCSL-INTRALIFT-method was chosen for sinuslifting in 155 sinuslift-sites for its minimal invasive transcrestal approach and scalable augmentation volume. Four different biomaterials were inserted randomly (easy-graft CRYSTAL n = 38, easy-graft CLASSIC n = 41, NanoBone n = 42, BioOss n = 34), 2 ccm in each case. After a mean healing period of 8,92 months uniform tapered screw Q2-implants were inserted and Drill-Torque-Values (DTV) and ITV were recorded and compared to a group of 36 subantral sites without need of sinuslifting. DTV/ITV were processed for statistics by ANOVA-tests. Mean DTV/ITV obtained in Ncm were: Control Group 10,2/22,2, Bio-Oss 12,7/26,2, NanoBone 17,5/33,3, easy-graft CLASSIC 20,3/45,9, easy-graft CRYSTAL 23,8/56,6 Ncm, significance-level of differences throughout p < 0,05. Within the limits of this study the results suggest self-hardening solid-block-like bone-graft-materials to achieve significantly better DTV/ITV than loose granulate biomaterials for its suspected improvement of vascularization and mineralization of the subantral scaffold by full immobilization of the augmentation site towards pressure changes in the human sinus at normal breathing.
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Affiliation(s)
- Angelo Troedhan
- Head of Maxillofacial Surgery Dep., Center for Facial Esthetics Vienna, Brauhausgasse 12, 1050 Vienna, Austria
| | - Izabela Schlichting
- Head of Oral Surgery &Implantology Dep., Center for Facial Esthetics Vienna, Brauhausgasse 12, 1050 Vienna, Austria
| | - Andreas Kurrek
- Head of Oral Surgery &Implantology Dep., Implantology Clinic Oberkassel, Dominikanerstrasse 10, 40545 Dusseldorf
| | - Marcel Wainwright
- Head of Oral Surgery &Implantology Dep., Implantology Clinic Kaiserswerth, Kaiserswerther Markt 25, 40489 Dusseldorf
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Schreiber JJ, Anderson PA, Hsu WK. Use of computed tomography for assessing bone mineral density. Neurosurg Focus 2014; 37:E4. [PMID: 24981903 DOI: 10.3171/2014.5.focus1483] [Citation(s) in RCA: 147] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Assessing local bone quality on CT scans with Hounsfield unit (HU) quantification is being used with increasing frequency. Correlations between HU and bone mineral density have been established, and normative data have been defined throughout the spine. Recent investigations have explored the utility of HU values in assessing fracture risk, implant stability, and spinal fusion success. The information provided by a simple HU measurement can alert the treating physician to decreased bone quality, which can be useful in both medically and surgically managing these patients.
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Affiliation(s)
- Joseph J. Schreiber
- 1Department of Orthopaedic Surgery, Hospital for Special Surgery, New York, New York
| | - Paul A. Anderson
- 2Department of Orthopedics & Rehabilitation, University of Wisconsin, Madison, Wisconsin; and
| | - Wellington K. Hsu
- 3Department of Orthopaedic Surgery, Northwestern University Feinberg School of Medicine, Chicago, Illinois
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Milenkovic P, Djuric M, Milovanovic P, Djukic K, Zivkovic V, Nikolic S. The role of CT analyses of the sternal end of the clavicle and the first costal cartilage in age estimation. Int J Legal Med 2014; 128:825-39. [DOI: 10.1007/s00414-014-1026-9] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2013] [Accepted: 05/20/2014] [Indexed: 10/25/2022]
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Biologic evaluation of a hollow-type miniscrew implant: an experimental study in beagles. Am J Orthod Dentofacial Orthop 2014; 145:626-37. [PMID: 24785927 DOI: 10.1016/j.ajodo.2013.12.028] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2013] [Revised: 12/01/2013] [Accepted: 12/01/2013] [Indexed: 11/21/2022]
Abstract
INTRODUCTION The aims of this study were to assess the biologic stability of a newly designed hollow (H-type) miniscrew compared with conventional (C-type) miniscrews through histomorphometric and histologic analysis. METHODS Both types of miniscrews were placed into the maxillae and the mandibles of 12 beagles. Maximum insertion torque, Periotest (Siemens AG, Bensheim, Germany) value, bone-implant contact, and bone volume were measured. RESULTS The overall success rates of the H-type were 78.3% in the maxilla and 60.0% in the mandible. Mean maximum insertion torque values of the H-type were 14.2 N-cm in the maxilla and 20.9 N-cm in the mandible. The Periotest values of the H-type were -1.5 in the maxilla and -6.4 in the mandible. Mean maximum insertion torque and Periotest values of the H-type were higher than those of the C-type. In the maxilla, the bone-implant contact values of the H-type were 37.3% and 32.3% at 3 and 12 weeks, respectively. In the mandible, the bone-implant contact values were 31.4% and 18.5% at 3 and 12 weeks, respectively. CONCLUSIONS Considering the lower success rate and the insufficient bone-implant contact and bone volume of the H-type in the mandible, the clinician should choose a suitable combination of miniscrews depending on local bone quality and implantation site, such as an H-type in the maxilla and a C-type in the mandible.
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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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Analysis and comparison of clutch techniques of two dental implants. J Mech Behav Biomed Mater 2014; 34:1-7. [DOI: 10.1016/j.jmbbm.2014.01.017] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2013] [Revised: 01/21/2014] [Accepted: 01/23/2014] [Indexed: 11/19/2022]
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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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Herekar M, Sethi M, Ahmad T, Fernandes AS, Patil V, Kulkarni H. A correlation between bone (B), insertion torque (IT), and implant stability (S): BITS score. J Prosthet Dent 2014; 112:805-10. [PMID: 24726588 DOI: 10.1016/j.prosdent.2014.02.011] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2013] [Revised: 02/27/2014] [Accepted: 02/28/2014] [Indexed: 10/25/2022]
Abstract
STATEMENT OF PROBLEM Although criteria for assessing bone quality have been reported, an overall score that correlates bone quality with the primary stability and secondary stability of implants is not yet available. PURPOSE The purpose of this article was to propose a scoring index that will establish a correlation among the bone density values from computed tomography, maximum insertion torque values, and resonance frequency analysis in different phases of implant treatment. MATERIAL AND METHODS In this study, 60 implant sites were evaluated to assess bone density (Hounsfield units), insertion torque values (Ncm), and primary stability and secondary stability (implant stability quotient values obtained by using resonance frequency analysis). On the basis of computed tomography data, the bone was classified as D1 to D4. The insertion torque was noted and classified into 2 groups, A and B. The implant stability quotient values obtained from resonance frequency analysis depicting primary stability and secondary stability were classified into 5 groups. The primary score noted was a result of the values obtained for the 3 parameters at the time of implant placement. The secondary score was obtained by considering the values of the bone density and resonance frequency analysis recorded at different time intervals. RESULTS Bone densities of D2, D3, and D4 were noted, dividing the bone type into 3 groups. The maximum torque noted in the study was 40 Ncm. The difference between various insertion torque values and bone types was found to be statistically nonsignificant. Higher mean implant stability quotient values were obtained for primary and secondary stability for the D2 bone than for D3 and D4 bone. When analyzed according to the time of insertion, the mean values increased at second stage surgery in all bone types. The difference in mean values among all bone types was found to be statistically significant (P<.001). A comparison of primary and secondary implant stability quotient values in all bone types did not find any statistical significance (P=.780). A score was recorded at the time of implant placement and at the time of second stage surgery, and the prosthetic treatment was planned accordingly. CONCLUSIONS The score highlights the importance of considering the association of bone quality, insertion torque values, and stability as denoted by implant stability quotient throughout treatment. Based on the variation in the score noted at recall visits, alterations in the treatment plan can be made with respect to the healing period and prosthetic design.
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Affiliation(s)
- Manisha Herekar
- Professor and Department Head, Department of Prosthodontics, Maratha Mandal's Nathajirao G. Halgekar Institute of Dental Sciences and Research Centre, Belgaum, Karnataka, India.
| | - Megha Sethi
- Postgraduate student, Department of Prosthodontics, Maratha Mandal's Nathajirao G. Halgekar Institute of Dental Sciences and Research Centre, Belgaum, Karnataka, India
| | - Tousif Ahmad
- Postgraduate student, Department of Prosthodontics, Maratha Mandal's Nathajirao G. Halgekar Institute of Dental Sciences and Research Centre, Belgaum, Karnataka, India
| | | | - Viraj Patil
- Professor, Department of Prosthodontics, Maratha Mandal's Nathajirao G. Halgekar Institute of Dental Sciences and Research Centre, Belgaum, Karnataka, India
| | - Harish Kulkarni
- Dean, Professor, and Head of Department, Department of Oral and Maxillofacial Surgery, Tatyasaheb Kore Dental College and Research Centre, Warnanagar, Maharashtra, India
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Hasan I, Dominiak M, Blaszczyszyn A, Bourauel C, Gedrange T, Heinemann F. Radiographic evaluation of bone density around immediately loaded implants. Ann Anat 2014; 199:52-7. [PMID: 24690291 DOI: 10.1016/j.aanat.2014.02.009] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2013] [Revised: 02/25/2014] [Accepted: 02/28/2014] [Indexed: 10/25/2022]
Abstract
Understanding the changes in bone density after insertion of dental implants and their relation to immediate loading is essential to achieving improvements in their survival rate. Histological investigations of the bone bed in humans are limited, which in turn hampers opportunities to deepen knowledge about the remodelling process around dental implants. The aim of the present study was to follow the change in bone density by measuring the grey values of cone beam computed tomography (CBCT) at different periods subsequent to implant insertion. The CBCTs of 20 individual immediately loaded implants were evaluated at three time points: prior to surgery, one month following, and six months after the operation. The grey values were measured at different regions around the implants. Reduction in the grey values was observed with respect to the reference values after one month and six months from implant insertion in the apical, middle, and cervical regions. No correlation was detected either between the change in grey values and drilling method or with the measured primary and secondary stabilities by Osstell ISQ instrument. Cone beam computed tomography can be used as a qualitative method to support clinical follow up and monitor the changes in bone density around implants in critical cases.
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Affiliation(s)
- Istabrak Hasan
- Endowed Chair of Oral Technology, Rheinische Friedrich-Wilhelms University, Welschnonnenstr. 17, 53111 Bonn, Germany; Department of Prosthetic Dentistry, Preclinical Education and Materials Science, Dental School, Rheinische Friedrich-Wilhelms University, Welschnonnenstr. 17, 53111 Bonn, Germany.
| | - Marzena Dominiak
- Department of Oral Surgery of Silesian Piast Medical University of Wroclaw, Poland, Krakowska 26, 50-425 Wroclaw, Poland
| | - Artur Blaszczyszyn
- Department of Oral Surgery of Silesian Piast Medical University of Wroclaw, Poland, Krakowska 26, 50-425 Wroclaw, Poland
| | - Christoph Bourauel
- Endowed Chair of Oral Technology, Rheinische Friedrich-Wilhelms University, Welschnonnenstr. 17, 53111 Bonn, Germany
| | - Tomasz Gedrange
- Department of Oral Surgery of Silesian Piast Medical University of Wroclaw, Poland, Krakowska 26, 50-425 Wroclaw, Poland; Department of Orthodontics, Preventive and Pediatric Dentistry, University Dresden, Germany
| | - Friedhelm Heinemann
- Department of Prosthodontics, Gerodontology and Biomaterials, University of Greifswald, Rotgerberstr. 8, 17475 Greifswald, Germany; Private Practice, Im Hainsfeld 29, 51597 Morsbach, Germany
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Chang PC, Seol YJ, Goldstein SA, Giannobile WV. Determination of the dynamics of healing at the tissue-implant interface by means of microcomputed tomography and functional apparent moduli. Int J Oral Maxillofac Implants 2014; 28:68-76. [PMID: 23377049 DOI: 10.11607/jomi.2614] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
PURPOSE It is currently a challenge to determine the biomechanical properties of the hard tissue-dental implant interface. Recent advances in intraoral imaging and tomographic methods, such as microcomputed tomography (micro-CT), provide three-dimensional details, offering significant potential to evaluate the bone-implant interface, but yield limited information regarding osseointegration because of physical scattering effects emanating from metallic implant surfaces. In the present study, it was hypothesized that functional apparent moduli (FAM), generated from functional incorporation of the peri-implant structure, would eliminate the radiographic artifact-affected layer and serve as a feasible means to evaluate the biomechanical dynamics of tissue-implant integration in vivo. MATERIALS AND METHODS Cylindric titanium mini-implants were placed in osteotomies and osteotomies with defects in rodent maxillae. The layers affected by radiographic artifacts were identified, and the pattern of tissue-implant integration was evaluated from histology and micro-CT images over a 21-day observation period. Analyses of structural information, FAM, and the relationship between FAM and interfacial stiffness (IS) were done before and after eliminating artifacts. RESULTS Physical artifacts were present within a zone of about 100 to 150 Μm around the implant in both experimental defect situations (osteotomy alone and osteotomy + defect). All correlations were evaluated before and after eliminating the artifact-affected layers, most notably during the maturation period of osseointegration. A strong correlation existed between functional bone apparent modulus and IS within 300 Μm at the osteotomy defects (r > 0.9) and functional composite tissue apparent modulus in the osteotomy defects (r > 0.75). CONCLUSION Micro-CT imaging and FAM were of value in measuring the temporal process of tissue-implant integration in vivo. This approach will be useful to complement imaging technologies for longitudinal monitoring of osseointegration.
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Affiliation(s)
- Po-Chun Chang
- Department of Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, MI, USA.
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Kwak MS, Kim SG. In vitro evaluation of resonance frequency analysis values to different implant contact ratio and stiffness of surrounding material. J Adv Prosthodont 2013; 5:428-33. [PMID: 24353881 PMCID: PMC3865198 DOI: 10.4047/jap.2013.5.4.428] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2013] [Revised: 09/26/2013] [Accepted: 10/18/2013] [Indexed: 11/08/2022] Open
Abstract
PURPOSE The present study was aimed to evaluate the influence of implant contact ratio and stiffness of implant-surrounding materials on the resonance frequency analysis (RFA) values. MATERIALS AND METHODS Seventy resin blocks that had the different amounts (100, 50, 30, 15%) of resin-implant contact (RIC) were fabricated. Ten silicone putty blocks with 100% silicone-implant contact were also made. The implants with Ø5.0 mm × 13.0 mm were placed on eighty specimen blocks. The RFA value was measured on the transducer that was connected to each implant by Osstell Mentor. Kruskal-Wallis and Scheffe's tests (α=.05) were done for statistical analysis. RESULTS The control resin group with 100% RIC had the highest RFA value of 83.9, which was significantly different only from the resin group with 15% RIC among the resin groups. The silicone putty group with 100% contact had the lowest RFA value of 36.6 and showed statistically significant differences from the resin groups. CONCLUSION Within the limitations of this in vitro study, there was no significant difference in the RFA values among the resin groups with different RIC's except when the RIC difference was more than 85%. A significant increase in the RFA value was observed related to the increase in stiffness of material around implant.
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Affiliation(s)
- Mu-Seung Kwak
- Department of Prosthodontics, Graduate School of Clinical Dental Science, The Catholic University of Korea, Seoul, Republic of Korea
| | - Seok-Gyu Kim
- Department of Prosthodontics, Samsung Medical Center, College of Medicine, Sungkyunkwan University, Seoul, Republic of Korea
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Kim SJ, Ribeiro ALVL, Atlas AM, Saleh N, Royal J, Radvar M, Korostoff J. Resonance frequency analysis as a predictor of early implant failure in the partially edentulous posterior maxilla following immediate nonfunctional loading or delayed loading with single unit restorations. Clin Oral Implants Res 2013; 26:183-90. [DOI: 10.1111/clr.12310] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/04/2013] [Indexed: 11/29/2022]
Affiliation(s)
- Steven J. Kim
- Department of Oral Biology; University of North Carolina at Chapel Hill School of Dentistry; Chapel Hill NC USA
| | | | - Alan M. Atlas
- Department of Preventive and Restorative Sciences; University of Pennsylvania School of Dental Medicine; Philadelphia PA USA
| | - Najeed Saleh
- Department of Preventive and Restorative Sciences; University of Pennsylvania School of Dental Medicine; Philadelphia PA USA
| | | | - Mehrdad Radvar
- Department of Periodontics; School of Dentistry; Mashhad Dental Research Center; Mashhad Iran
| | - Jonathan Korostoff
- Department of Periodontics; University of Pennsylvania School of Dental Medicine; Philadelphia PA USA
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Duyck J, Roesems R, Cardoso MV, Ogawa T, De Villa Camargos G, Vandamme K. Effect of insertion torque on titanium implant osseointegration: an animal experimental study. Clin Oral Implants Res 2013; 26:191-6. [PMID: 24325598 DOI: 10.1111/clr.12316] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/09/2013] [Indexed: 01/11/2023]
Abstract
OBJECTIVE To evaluate the effect of implant insertion torque on the peri-implant bone healing and implant osseointegration. MATERIAL AND METHODS Bilaterally in the tibia of five adult New Zealand white rabbits, 20 implants were installed, subdivided into four groups, corresponding to two insertion torque conditions (low, < 10 Ncm vs. high > 50 Ncm) and 2 experimental periods (2 weeks vs. 4 weeks of healing). The implant insertion torque was determined by the surgical drill diameter relative to the implant diameter. Implant osseointegration was evaluated by quantitative histology (bone-to-implant contact with host bone [BIC-host], with neoformed bone [BIC-de novo], with both bone types [BIC-total], and peri-implant bone [BA/TA]). Every response was modelled over time using GEE (general estimation equation) with an unstructured variance-covariance matrix to correct for dependency between the measurements from one animal. The statistical significance level of α = 0.05 was applied. RESULTS Significantly, more BIC-host and BIC-total were recorded for H implants compared with L implants after 2 week of healing (P = 0.010 and P = 0.0001, respectively). However, this result was no longer found for the extended healing period. Furthermore, BIC-total significantly increased over time for L implants (P < 0.00001). In contrast, the significant increase in BA/TA over time was found for H implants (P < 0.01). Finally, H insertion torque led to an increased BA/TA after 4 week of healing (P < 0.02) compared with the L insertion protocol. CONCLUSION L insertion torque implants installed in the rabbit tibial bone osseointegrate with considerable de novo bone formation. This bone neoformation enables L implants to catch up, already during the early osseointegration stage, the initial inferior amount BIC contact compared with that of H implants. A negative impact of the created strain environment accompanying H insertion torque implant installation on the biological process of osseointegration could not be observed, at least not at tissue level.
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Affiliation(s)
- Joke Duyck
- Department of Oral Health Sciences & Dental Clinic, KU Leuven & University Hospitals Leuven, BIOMAT KU Leuven & Prosthetics Unit, Leuven, Belgium
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Miguel-Sánchez A, Vilaplana-Vivo J, Vilaplana-Vivo C, Vilaplana-Gómez JÁ, Camacho-Alonso F. Accuracy of Quantitative Computed Tomography Bone Mineral Density Measurements in Mandibles: A Cadaveric Study. Clin Implant Dent Relat Res 2013; 17:693-9. [PMID: 24219414 DOI: 10.1111/cid.12168] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
PURPOSE The aim was to investigate the accuracy of quantitative computed tomography bone mineral density (BMD) measurements in mandibles, comparing measured BMD with calibrated BMD. MATERIALS AND METHODS Seventy mandibles from adult cadavers were used. Twenty tomographic cuts were made in each mandible. In each tomographic cut, a region of interest was located, and the bone density was measured in Hounsfield unit (HU). A polymethyl methacrylate phantom containing four inserts of different predetermined densities (hydroxyapatite 100, 200, 500, and 700 mg/cm(3) ) was used to calculate calibrated bone density. Correlation between measured and calibrated bone densities was calculated. RESULTS Mean total correlation between measured and calibrated BMD in the 20 sagittal tomography cuts showed almost perfect positive correlation (r = 0.998, p < .001). However, when average BMD measurements in HU were compared, the measured total BMD (in the 20 sagittal tomography cuts studied) was 54.99 ± 421.59, whereas the total calibrated BMD was 49.28 ± 364.95, with statistically significant difference (p = .001). CONCLUSIONS There are discrepancies between measured and calibrated BMD; in this sense, a calibrated bone phantom with a predetermined mineral density should be used to determine the exact BMD before dental implants surgery.
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Ibrahim N, Parsa A, Hassan B, van der Stelt P, Wismeijer D. Diagnostic imaging of trabecular bone microstructure for oral implants: a literature review. Dentomaxillofac Radiol 2013; 42:20120075. [PMID: 23420864 DOI: 10.1259/dmfr.20120075] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
Several dental implant studies have reported that radiographic evaluation of bone quality can aid in reducing implant failure. Bone quality is assessed in terms of its quantity, density, trabecular characteristics and cells. Current imaging modalities vary widely in their efficiency in assessing trabecular structures, especially in a clinical setting. Most are very costly, require an extensive scanning procedure coupled with a high radiation dose and are only partially suitable for patient use. This review examines the current literature regarding diagnostic imaging assessment of trabecular microstructure prior to oral implant placement and suggests cone beam CT as a method of choice for evaluating trabecular bone microstructure.
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Affiliation(s)
- N Ibrahim
- Department of General and Specialized Dentistry, Section of Oral Radiology, Academic Center for Dentistry Amsterdam (ACTA), Gustav Mahlerlaan 3004, 1081 LA Amsterdam, Netherlands.
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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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Pervaiz K, Cabezas A, Downes K, Santoni BG, Frankle MA. Osteoporosis and shoulder osteoarthritis: incidence, risk factors, and surgical implications. J Shoulder Elbow Surg 2013; 22:e1-8. [PMID: 22938788 DOI: 10.1016/j.jse.2012.05.029] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/19/2012] [Revised: 05/08/2012] [Accepted: 05/15/2012] [Indexed: 02/01/2023]
Abstract
BACKGROUND Patients with osteoarthritis undergoing shoulder arthroplasty may suffer from osteoporosis. The purpose of this study was to determine whether computed tomography (CT)-derived Hounsfield unit (HU) measurements correlate with bone mineral density (BMD) and whether these data could predict implant size and fixation choice. MATERIALS AND METHODS The study analyzed preoperative dual energy x-ray absorptiometry and shoulder CT scans for 230 patients who underwent total shoulder arthroplasty. Hip BMD and T scores and HU attenuation in the humerus were correlated. HU cutoff values were developed to aid in differentiating patients whose BMD values were within normal reference ranges from patients with osteopenia or osteoporosis. Risk factors associated with low BMD were correlated, and the effect of BMD on humeral stem size, and fixation method was investigated. RESULTS Significant correlations between HU and hip BMD and T score were identified (P < .001). HU value ranges were identified that may alert the surgeon of metabolic bone disease. Significant correlation (P < 0.05) was found between low BMD and certain osteoporosis risk factors. Age at time of surgery was a predictor of cemented stem fixation (P = .024). Patients with a lower BMD were statistically more likely to receive a larger-diameter humeral stem (P = .016). CONCLUSIONS Orthopedic surgeons may be able to use data obtained from shoulder CT scans to predict the need for larger stem size or cement fixation during shoulder arthroplasty. In combination with the risk factor profile, these data may be useful in predicting the need for an osteoporosis workup and treatment. LEVEL OF EVIDENCE Level III, Study of Nonconsecutive Patients, Diagnostic Study.
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Hsu JT, Huang HL, Tsai MT, Wu AJ, Tu MG, Fuh LJ. Effects of the 3D bone-to-implant contact and bone stiffness on the initial stability of a dental implant: micro-CT and resonance frequency analyses. Int J Oral Maxillofac Surg 2013; 42:276-80. [DOI: 10.1016/j.ijom.2012.07.002] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2011] [Revised: 05/16/2012] [Accepted: 07/10/2012] [Indexed: 10/28/2022]
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75
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Pommer B, Hof M, Fädler A, Gahleitner A, Watzek G, Watzak G. Primary implant stability in the atrophic sinus floor of human cadaver maxillae: impact of residual ridge height, bone density, and implant diameter. Clin Oral Implants Res 2012; 25:e109-13. [PMID: 23167282 DOI: 10.1111/clr.12071] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/01/2012] [Indexed: 11/30/2022]
Abstract
OBJECTIVES Simultaneous implant placement in conjunction with lateral or transcrestal maxillary sinus floor augmentation gives the benefit of reduction in healing times and surgical interventions. Primary implant stability, however, may be significantly reduced in resorbed residual ridges. Aim of the present study was to investigate the impact of residual bone height, bone density, and implant diameter on primary stability of implants in the atrophic sinus floor. MATERIAL AND METHODS A total of 66 NobelActive implants were inserted in the sinus floor of fresh human cadaver maxillae: 22 narrow (3.5 mm), 22 regular (4.3 mm), and 22 wide (5.0 mm) diameter implants in residual ridges of 2-6 mm height. Presurgical computed tomographic scans were acquired to assess bone height and density. Primary implant stability was evaluated by insertion torque values (ITV), Periotest values (PTV), and Osstell implant stability quotients (ISQ). RESULTS Correlations within outcomes (ITV, PTV, ISQ) were highly significant (P < 0.001). Radiographic bone density was found to significantly impact all three outcome measures (P < 0.001), while no influence of residual bone height and implant diameter could be revealed by multifactorial analysis. Consistent results were seen in all subgroups (including residual ridges of 5-6 mm height). CONCLUSIONS Bone density seems to represent the major determinant of primary stability in maxillary sinus augmentation with simultaneous implant placement (as well as 5-6 mm short implants in the maxillary sinus floor). Preoperative bone density assessment may help to avoid stability-related complications in one-stage implant treatment of the atrophic posterior maxilla.
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Affiliation(s)
- Bernhard Pommer
- Department of Oral Surgery, Bernhard Gottlieb School of Dentistry, Vienna Medical University, Vienna, Austria
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76
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Elias CN, Rocha FA, Nascimento AL, Coelho PG. Influence of implant shape, surface morphology, surgical technique and bone quality on the primary stability of dental implants. J Mech Behav Biomed Mater 2012. [PMID: 23182386 DOI: 10.1016/j.jmbbm.2012.10.010] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The primary stability of dental implants has been investigated before, but a study of the influence of implant shape, size and surface morphology (machined, acid etched or anodized), surgical technique (press-fit or undersized) and substrate (natural or simulated bone) on the primary stability of dental implants has not been reported. The present work intends to fill this gap. In this work, six different dental implants were inserted into and removed from synthetic and natural bone while measuring the torque. A total of 255 dental implants with three shapes, four sizes and three surface topographies were inserted into pig rib, PTFE and polyurethane. The implant sites were prepared using straight and tapered drills. The primary stability was estimated from the maximum insertion torque. Comparisons between samples were based on the maximum insertion torque (MIT), the maximum removal torque (MRT) and the torque ratio (TR=MRT/MIT). The insertion torque into pig ribs showed larger dispersion. All parameters (shape, size and surface morphology of the implant, surgical technique and substrate type) were found to have a significant influence on primary stability. The insertion of a tapered implant requires a higher torque than the insertion of a straight implant. Surface treatments improve the primary stability. The influence of the surgical technique is smaller than that of implant size and shape. The highest insertion torque was that of anodized tapered implants inserted into undersized sites. Finally, the primary stability of dental implants is highly dependent on implant design, surgical technique and substrate type.
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Affiliation(s)
- Carlos Nelson Elias
- Biomaterials Laboratory, Instituto Militar de Engenharia, Rio de Janeiro, RJ, Brazil.
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Wu SW, Lee CC, Fu PY, Lin SC. The effects of flute shape and thread profile on the insertion torque and primary stability of dental implants. Med Eng Phys 2012; 34:797-805. [DOI: 10.1016/j.medengphy.2011.09.021] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2011] [Revised: 08/09/2011] [Accepted: 09/22/2011] [Indexed: 11/24/2022]
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Mazzo CR, Reis ACD, Shimano AC, Valente MLDC. In vitro analysis of the influence of surface treatment of dental implants on primary stability. Braz Oral Res 2012; 26:313-7. [DOI: 10.1590/s1806-83242012005000006] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2011] [Accepted: 03/26/2012] [Indexed: 11/22/2022] Open
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Campos FE, Gomes JB, Marin C, Teixeira HS, Suzuki M, Witek L, Zanetta-Barbosa D, Coelho PG. Effect of Drilling Dimension on Implant Placement Torque and Early Osseointegration Stages: An Experimental Study in Dogs. J Oral Maxillofac Surg 2012; 70:e43-50. [DOI: 10.1016/j.joms.2011.08.006] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2011] [Revised: 08/01/2011] [Accepted: 08/04/2011] [Indexed: 10/14/2022]
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PARK KJ, KWON JY, KIM SK, HEO SJ, KOAK JY, LEE JH, LEE SJ, KIM TH, KIM MJ. The relationship between implant stability quotient values and implant insertion variables: a clinical study. J Oral Rehabil 2011; 39:151-9. [DOI: 10.1111/j.1365-2842.2011.02255.x] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Computed tomographic characterization of mini-implant placement pattern and maximum anchorage force in human cadavers. Am J Orthod Dentofacial Orthop 2011; 140:356-65. [DOI: 10.1016/j.ajodo.2010.05.024] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2010] [Revised: 05/01/2010] [Accepted: 05/01/2010] [Indexed: 11/18/2022]
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Hsiao WK, Yew TL, Lai YL, Lee SY, Chen HL. Intramarrow Bone Morphogenetic Protein 4 Gene Delivery Improves Local Bone Quality in Femurs of Ovariectomized Rabbits. J Periodontol 2011; 82:854-62. [DOI: 10.1902/jop.2010.100208] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Schreiber JJ, Anderson PA, Rosas HG, Buchholz AL, Au AG. Hounsfield units for assessing bone mineral density and strength: a tool for osteoporosis management. J Bone Joint Surg Am 2011; 93:1057-63. [PMID: 21655899 DOI: 10.2106/jbjs.j.00160] [Citation(s) in RCA: 524] [Impact Index Per Article: 40.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
BACKGROUND Measurements obtained from clinical computed tomography examinations may yield information leading to the diagnosis of decreased bone mineral density, without added expense to the patient. The purpose of the present study was to determine if Hounsfield units, a standardized computed tomography attenuation coefficient, correlate with bone mineral density and compressive strength. METHODS Twenty-five patients (including eighteen female and seven male patients with a mean age of 71.3 years) undergoing both lumbar spine dual x-ray absorptiometry scans and computed tomography imaging were evaluated to determine if Hounsfield units correlated with bone mineral density and T-scores. Normative data were generated from lumbar spine computed tomography examinations for eighty consecutive trauma patients and were stratified by age and sex. Separately, polyurethane foam blocks of varying densities were imaged with computed tomography and were subjected to mechanical testing to determine compressive strength. Compressive strength values and Hounsfield units were analyzed for correlation. RESULTS Significant correlations were found between Hounsfield units and bone mineral density, age, and T-scores and between Hounsfield units and compressive strength (p < 0.001). CONCLUSIONS Hounsfield units obtained from clinical computed tomography scans that are made for other purposes correlate with dual x-ray absorptiometry scores as well as compressive strengths based on osseous models and potentially provide an alternative method for determining regional bone mineral density at no additional cost to the patient. The information could conceivably be applied toward fracture risk assessment, diagnosis of osteoporosis, and early initiation of needed treatment.
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Affiliation(s)
- Joseph J Schreiber
- Department of Orthopedics and Rehabilitation, University of Wisconsin, Madison, Wisconsin, USA
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Hsu JT, Fuh LJ, Tu MG, Li YF, Chen KT, Huang HL. The effects of cortical bone thickness and trabecular bone strength on noninvasive measures of the implant primary stability using synthetic bone models. Clin Implant Dent Relat Res 2011; 15:251-61. [PMID: 21599830 DOI: 10.1111/j.1708-8208.2011.00349.x] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
PURPOSE This study investigated how the primary stability of a dental implant as measured by the insertion torque value (ITV), Periotest value (PTV), and implant stability quotient (ISQ) is affected by varying thicknesses of cortical bone and strengths of trabecular bone using synthetic bone models. MATERIALS AND METHODS Four synthetic cortical shells (with thicknesses of 0, 1, 2, and 3 mm) were attached to four cellular rigid polyurethane foams (with elastic moduli of 137, 47.5, 23, and 12.4 MPa) and one open-cell rigid polyurethane foam which mimic the osteoporotic bone (with an elastic modulus 6.5 MPa), to represent the jawbones with various cortical bone thicknesses and strengths of trabecular bone. A total of 60 bone specimens accompanied with implants was examined by a torque meter, Osstell resonance frequency analyzer, and Periotest electronic device. All data were statistically analyzed by two-way analysis of variance. In addition, second-order nonlinear regression was utilized to assess the correlations of the primary implant stability with the four cortex thicknesses and five strengths of trabecular bone. RESULTS ITV, ISQ, and PTV differed significantly (p < .05) and were strongly correlated with the thickness of cortical bone (R(2) > 0.9) and the elastic modulus of trabecular bone (R(2) = 0.74-0.99). CONCLUSIONS The initial stability at the time of implant placement is influenced by both the cortical bone thickness and the strength of trabecular bone; however, these factors are mostly nonlinearly correlated with ITV, PTV, and ISQ. Using ITV and PTV seems more suitable for identifying the primary implant stability in osteoporotic bone with a thin cortex.
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Affiliation(s)
- Jui-Ting Hsu
- School of Dentistry, China Medical University, Taiwan
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85
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Dahlin C, Widmark G, Bergkvist G, Fürst B, Widbom T, Kashani H. One-year results of a clinical and radiological prospective multicenter study on NEOSS® dental implants. Clin Implant Dent Relat Res 2011; 15:303-8. [PMID: 21554532 DOI: 10.1111/j.1708-8208.2011.00356.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
BACKGROUND NEOSS® (Neoss Ltd., Harrogate, UK) dental implant system was introduced on the clinical arena in 2003. It is important that novel implant systems are systematically evaluated in a multicenter setting. PURPOSE The aim of this study was to follow a large number of consecutively treated patients, with NEOSS dental implant system, both clinically and radiographically. The current report constitutes the 1-year data of a planned 5-year study. MATERIALS AND METHODS The study included a total of 177 patients treated with 590 NEOSS implants at 13 clinics in Sweden. The material was composed of 72 males and 105 females treated for single, partial, and total edentulism. Clinical, radiographic, and subjective evaluations were performed. RESULTS Out of 590 implants, 13 early failures have been reported, corresponding to a 1-year cumulative survival rate (CSR) of 97.8%. Evaluation of function and esthetics at the 1-year visit resulted in 100% success for function and 98% success for the esthetic outcome. The mean marginal bone loss was 0.6 mm (SD 1.1) after 1 year in clinical function. No adverse effects of the NEOSS dental implants were reported, and complications were few and similar to those reported for implant treatment in general. CONCLUSION The CSR in the present study was 97.8%. No adverse effects of the NEOSS implants were reported, and complications during the study period were few and similar to those reported to for other well-documented implants system. Based on the present data, we conclude that NEOSS dental implant is a safe and predictable implant system. However, the high number of dropouts in the radiological evaluation must be considered when interpreting the data.
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Affiliation(s)
- Christer Dahlin
- Department of Oral & Maxillofacial Surgery, NÄL Medical Centre Hospital, Trollhättan, Sweden.
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86
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Isoda K, Ayukawa Y, Tsukiyama Y, Sogo M, Matsushita Y, Koyano K. Relationship between the bone density estimated by cone-beam computed tomography and the primary stability of dental implants. Clin Oral Implants Res 2011; 23:832-6. [DOI: 10.1111/j.1600-0501.2011.02203.x] [Citation(s) in RCA: 94] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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87
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Freitas Jr AC, Bonfante EA, Giro G, Janal MN, Coelho PG. The effect of implant design on insertion torque and immediate micromotion. Clin Oral Implants Res 2011; 23:113-8. [DOI: 10.1111/j.1600-0501.2010.02142.x] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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88
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Nackaerts O, Maes F, Yan H, Couto Souza P, Pauwels R, Jacobs R. Analysis of intensity variability in multislice and cone beam computed tomography. Clin Oral Implants Res 2011; 22:873-9. [PMID: 21244502 DOI: 10.1111/j.1600-0501.2010.02076.x] [Citation(s) in RCA: 104] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
OBJECTIVES The aim of this study was to evaluate the variability of intensity values in cone beam computed tomography (CBCT) imaging compared with multislice computed tomography Hounsfield units (MSCT HU) in order to assess the reliability of density assessments using CBCT images. MATERIAL AND METHODS A quality control phantom was scanned with an MSCT scanner and five CBCT scanners. In one CBCT scanner, the phantom was scanned repeatedly in the same and in different positions. Images were analyzed using registration to a mathematical model. MSCT images were used as a reference. RESULTS Density profiles of MSCT showed stable HU values, whereas in CBCT imaging the intensity values were variable over the profile. Repositioning of the phantom resulted in large fluctuations in intensity values. CONCLUSIONS The use of intensity values in CBCT images is not reliable, because the values are influenced by device, imaging parameters and positioning.
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89
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Jo KH, Yoon KH, Park KS, Bae JH, You KH, Han JH, Shin JM, Baik JS, Jeon IS, Cheong JK. Thermally induced bone necrosis during implant surgery: 3 case reports. J Korean Assoc Oral Maxillofac Surg 2011. [DOI: 10.5125/jkaoms.2011.37.5.406] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Affiliation(s)
- Kyu-Hong Jo
- Department of Oral and Maxillofacial Surgery, Sanggye Paik Hospital, College of Medicine, Inje University, Seoul, Korea
| | - Kyh-Ho Yoon
- Department of Oral and Maxillofacial Surgery, Sanggye Paik Hospital, College of Medicine, Inje University, Seoul, Korea
| | - Kwan-Soo Park
- Department of Oral and Maxillofacial Surgery, Sanggye Paik Hospital, College of Medicine, Inje University, Seoul, Korea
| | - Jung-Ho Bae
- Department of Oral and Maxillofacial Surgery, Sanggye Paik Hospital, College of Medicine, Inje University, Seoul, Korea
| | - Kyung-Ha You
- Department of Oral and Maxillofacial Surgery, Sanggye Paik Hospital, College of Medicine, Inje University, Seoul, Korea
| | - Ji-Hoon Han
- Department of Oral and Maxillofacial Surgery, Sanggye Paik Hospital, College of Medicine, Inje University, Seoul, Korea
| | - Jae-Myung Shin
- Department of Oral and Maxillofacial Surgery, Ilsan Paik Hospital, College of Medicine, Inje University, Goyang, Korea
| | - Jee-Seon Baik
- Department of Oral and Maxillofacial Surgery, Ilsan Paik Hospital, College of Medicine, Inje University, Goyang, Korea
| | | | - Jeong-Kwon Cheong
- Department of Oral and Maxillofacial Surgery, Sanggye Paik Hospital, College of Medicine, Inje University, Seoul, Korea
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90
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Pagliani L, Motroni A, Nappo A, Sennerby L. Short Communication: Use of a Diagnostic Software to Predict Bone Density and Implant Stability in Preoperative CTs. Clin Implant Dent Relat Res 2010; 14:553-7. [DOI: 10.1111/j.1708-8208.2010.00291.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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91
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Merheb J, Coucke W, Jacobs R, Naert I, Quirynen M. Influence of bony defects on implant stability. Clin Oral Implants Res 2010; 21:919-23. [PMID: 20491838 DOI: 10.1111/j.1600-0501.2010.01932.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
INTRODUCTION The purpose of this study was to analyze the evolution of implant mechanical stability in different types/sizes of bony defects using both Periotest and Osstell devices as "objective tools." MATERIALS AND METHODS Thirty-two implants were randomly allocated to one of the four types of bone defects: marginal bone loss, peri-apical bone defect, constant width dehiscence and constant length dehiscences. Periotest/Osstell measurements were completed before and during staged bone removal (to enlarge defect size). RESULTS Significant differences (P<0.05) with initial values were found after a 2 mm marginal bone removal (Osstell/Periotest); for a peri-apical bone lesion, after removal of 5 mm (Osstell) or 8 mm (Periotest); for a 6-mm-long dehiscence, after removal up to 180 degrees of the implant perimeter (Osstell/Periotest); for a 3-mm-wide dehiscence, after removal of 10 mm (Osstell) or 6 mm (Periotest). CONCLUSION Periotest and Osstell are in general not very sensitive in the identification of peri-implant bone destruction, except for marginal bone loss.
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Affiliation(s)
- Joe Merheb
- Department of Periodontology, Catholic University Leuven, Leuven, Belgium.
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92
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Chang PC, Lang NP, Giannobile WV. Evaluation of functional dynamics during osseointegration and regeneration associated with oral implants. Clin Oral Implants Res 2010; 21:1-12. [PMID: 20070743 DOI: 10.1111/j.1600-0501.2009.01826.x] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
OBJECTIVES The aim of this paper is to review current investigations on functional assessments of osseointegration and assess correlations to the peri-implant structure. MATERIAL AND METHODS The literature was electronically searched for studies of promoting dental implant osseointegration, functional assessments of implant stability, and finite element (FE) analyses in the field of implant dentistry, and any references regarding biological events during osseointegration were also cited as background information. RESULTS Osseointegration involves a cascade of protein and cell apposition, vascular invasion, de novo bone formation and maturation to achieve the primary and secondary dental implant stability. This process may be accelerated by alteration of the implant surface roughness, developing a biomimetric interface, or local delivery of growth-promoting factors. The current available pre-clinical and clinical biomechanical assessments demonstrated a variety of correlations to the peri-implant structural parameters, and functionally integrated peri-implant structure through FE optimization can offer strong correlation to the interfacial biomechanics. CONCLUSIONS The progression of osseointegration may be accelerated by alteration of the implant interface as well as growth factor applications, and functional integration of peri-implant structure may be feasible to predict the implant function during osseointegration. More research in this field is still needed.
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Affiliation(s)
- Po-Chun Chang
- Department of Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, MI, USA
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93
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Rodrigo D, Aracil L, Martin C, Sanz M. Diagnosis of implant stability and its impact on implant survival: a prospective case series study. Clin Oral Implants Res 2010; 21:255-61. [DOI: 10.1111/j.1600-0501.2009.01820.x] [Citation(s) in RCA: 83] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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94
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Sotto-Maior BS, Rocha EP, Almeida EOD, Freitas-Júnior AC, Anchieta RB, Cury AADB. Influence of high insertion torque on implant placement: an anisotropic bone stress analysis. Braz Dent J 2010; 21:508-14. [DOI: 10.1590/s0103-64402010000600005] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The aim of this study was to evaluate the influence of the high values of insertion torques on the stress and strain distribution in cortical and cancellous bones. Based on tomography imaging, a representative mathematical model of a partial maxilla was built using Mimics 11.11 and Solid Works 2010 softwares. Six models were built and each of them received an implant with one of the following insertion torques: 30, 40, 50, 60, 70 or 80 Ncm on the external hexagon. The cortical and cancellous bones were considered anisotropic. The bone/implant interface was considered perfectly bonded. The numerical analysis was carried out using Ansys Workbench 10.0. The convergence of analysis (6%) drove the mesh refinement. Maximum principal stress (σmax) and maximum principal strain (εmax) were obtained for cortical and cancellous bones around to implant. Pearson's correlation test was used to determine the correlation between insertion torque and stress concentration in the periimplant bone tissue, considering the significance level at 5%. The increase in the insertion torque generated an increase in the σmax and εmax values for cortical and cancellous bone. The σmax was smaller for the cancellous bone, with greater stress variation among the insertion torques. The εmax was higher in the cancellous bone in comparison to the cortical bone. According to the methodology used and the limits of this study, it can be concluded that higher insertion torques increased tensile and compressive stress concentrations in the periimplant bone tissue.
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95
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A Technique for Atraumatic Extraction of Teeth Before Immediate Implant Placement Using Implant Drills. IMPLANT DENT 2009; 18:464-72. [DOI: 10.1097/id.0b013e3181bcc6d9] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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96
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Zhou W, Han C, Yunming L, Li D, Song Y, Zhao Y. Is the osseointegration of immediately and delayed loaded implants the same?���comparison of the implant stability during a 3-month healing period in a prospective study. Clin Oral Implants Res 2009; 20:1360-6. [DOI: 10.1111/j.1600-0501.2009.01757.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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