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Accuracy of two orthodontic mini-implant templates in the infrazygomatic crest zone: a prospective cohort study. BMC Oral Health 2022; 22:252. [PMID: 35739518 PMCID: PMC9229478 DOI: 10.1186/s12903-022-02285-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2022] [Accepted: 06/08/2022] [Indexed: 11/19/2022] Open
Abstract
Background In the clinic, most computer-aided design and manufacturing orthodontic mini-implant guides are suitable for the position between the tooth roots, and few templates are designed and used for the infrazygomatic crest zone. In this study, we took into account the structure of the infrazygomatic crest and 3D printing technology, developed two kinds of templates, and evaluated their clinical effects. Methods Seventeen patients who accepted 30 mini-implant insertions in the infrazygomatic crest were selected. According to different implantation methods, three groups were divided. In Groups A and B, the mini-implants were positioned with an A-type or B-type template designed by EXOCAD software. In Group C, the mini-implants were inserted by an experienced orthodontist without any guides. We simulate the bucco-palatal, mesio-distal, and vertical head positions in the Segma implant guide software and measure the deviation from the virtual design position of the mini-implant. The linear deviation of the mini-implant tip and cap and the angular deviation of the long axis of the mini-implant in the bucco-palatal direction, mesio-distal direction, and vertical direction were also measured. The results were statistically analysed by SPSS software. Results The deviations of Group A and Group C’s miniscrew cap in the bucco-palatal direction, Group A and Group B, Group A and Group C’s miniscrew tip in the mesio-distal direction, and Group B and Group C’s miniscrew tip and cap in the vertical direction were statistically significant (P < 0.05). There was a significant difference in the deviations of Group A and Group C’s miniscrew tip and cap in the vertical direction (P < 0.01). Conclusions In the vertical direction, the accuracy of implantation with the template is higher than that of the traditional method without the template to avoid piercing the maxillary sinus mucosa in the infrazygomatic crest zone.
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Hamdoon Z, Talaat W, Aziz A, Abdul Sattar A, Kheder W, Jerjes W. The consequences and outcomes associated with dental implants encroaching on adjacent teeth. Clin Implant Dent Relat Res 2021; 23:851-856. [PMID: 34622556 DOI: 10.1111/cid.13047] [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: 08/10/2020] [Revised: 09/17/2021] [Accepted: 09/21/2021] [Indexed: 12/01/2022]
Abstract
BACKGROUND Dental implant placement carries a risk of iatrogenic damage to adjacent root surfaces. PURPOSE To classify and understand different types of trauma to the tooth root body by dental implants. MATERIALS AND METHODS This prospective case series included 43 implants placed between February 2017 and June 2020 that had primary stability and were in a position that accidentally invaded the adjacent teeth. The type and degree of the injury were evaluated clinically and radiographically. Tenderness, mobility, and sensitivity tests of the injured teeth were conducted at different visits. Implant failure was confirmed by the presence of implant mobility during the healing period. RESULTS Overall, 43 patients had root injuries due to dental implant surgeries. Regarding the 43 injured roots, 32 developed transient tenderness to percussion, 16 developed variable degrees of resorption in the cementum, three lost pulp sensitivity and one had persistent tenderness to percussion. No injured teeth were lost. In three patients, implant periapical lesions were confirmed radiographically as radiolucency near the apex of the involved implants. Out of the 43 implants, 11 failed and were removed within 6 months, with an implant failure rate of (25%). CONCLUSIONS Root damage after implant surgery varies depending on the type and severity of injury. Periodic clinical and radiographical examination is necessary to monitor root resorption and implant integration and to rule out pulp necrosis.
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Affiliation(s)
- Zaid Hamdoon
- Department of Oral and Craniofacial Health Sciences, College of Dental Medicine, University of Sharjah, Sharjah, UAE.,University of Mosul, College of Dentistry, Mosul, Iraq.,Department of Oral and Maxillofacial Surgery, Yarmouk Dental University College, Baghdad, Iraq
| | - Wael Talaat
- Department of Oral and Craniofacial Health Sciences, College of Dental Medicine, University of Sharjah, Sharjah, UAE.,Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Suez Canal University, Ismailia, Egypt
| | - Ahmed Aziz
- Department of Oral and Craniofacial Health Sciences, College of Dental Medicine, University of Sharjah, Sharjah, UAE
| | - Abier Abdul Sattar
- Department of Oral and Craniofacial Health Sciences, College of Dental Medicine, University of Sharjah, Sharjah, UAE
| | - Waad Kheder
- Department of Oral and Craniofacial Health Sciences, College of Dental Medicine, University of Sharjah, Sharjah, UAE
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Long term clinical result of implant induced injury on the adjacent tooth. Sci Rep 2021; 11:7913. [PMID: 33846470 PMCID: PMC8041840 DOI: 10.1038/s41598-021-87062-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2020] [Accepted: 03/23/2021] [Indexed: 11/08/2022] Open
Abstract
The purpose of the retrospective study was to investigate the long-term result of implant-induced injury on the adjacent tooth. The subjects of this retrospective study were patients who had received implants and had tooth injury; direct invasion of root (group I), root surface contact (group II), or < 1 mm distance of the implant from the root (group III). Clinical and pathological changes were periodically examined using radiographs and intra-oral examinations. Paired t-tests and chi-square tests were used to evaluate the implant stability quotient (ISQ) of implant and tooth complications, respectively (α = 0.05). A total of 32 implants and teeth in 28 patients were observed for average 122.7 (± 31.7, minimum 86) months. Seven teeth, three of which were subsequently extracted, needed root canal treatment. Finally, 90.6% of the injured teeth remained functional. Complications were significant and varied according to the group, with group I showing higher events than the others. The ISQs increased significantly. One implant in group I resulted in osseointegration failure. The implant survival rate was 96.9%. In conclusion, it was found even when a tooth is injured by an implant, immediate extraction is unnecessary, and the osseointegration of the invading implant is also predictable.
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Srinivasan S, Tee BC, Wang A, Gohel A, Kim DG, Deguchi T, Sun Z. Reliability and accuracy of assessing temporary anchorage device-tooth root contact with cone-beam computed tomography. Am J Orthod Dentofacial Orthop 2021; 159:271-280. [PMID: 33485718 DOI: 10.1016/j.ajodo.2020.01.020] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2019] [Revised: 12/01/2019] [Accepted: 01/01/2020] [Indexed: 11/18/2022]
Abstract
INTRODUCTION This study was aimed at investigating the reliability and accuracy of cone-beam computed tomography (CBCT) diagnosis of contact between a temporary anchorage device (TAD) and tooth root and assessing any effect produced by metal brackets, imaging software program, and image segmentation or color enhancement tools. METHODS Eighteen fresh pig mandibles were used. TADs (Vector, 1.4 × 8 mm) were placed at the buccal intermolar alveolar bone on both sides of the mandibles. With soft tissue kept intact, each mandible underwent CBCT scans (voxel size, 400 μm) before and after placing TADs, and after placing metal brackets on involved molars. Alveolar bone specimens containing the TADs were then exposed to microcomputed tomography (microCT) scans (voxel size, 27 μm) after TAD removal. Two independent raters, blinded of image identity, diagnosed TAD-root contact using ImageJ (National Institutes of Health and the Laboratory for Optical and Computational Instrumentation, University of Wisconsin, Madison, Wis) for microCT; Dolphin (Dolphin Imaging and Management Solutions, Chatsworth, Calif) and Anatomage software programs (Anatomage, Santa Clara, Calif) for CBCT images. Intrarater and interrater reliability and diagnostic accuracy were statistically assessed using Cohen kappa and McNemar tests. RESULTS Intrarater and interrater reliability of TAD-root contact diagnoses were perfect for microCT diagnoses (κ = 1), generally moderate to good (κ >0.5) for CBCT diagnoses except for the use of color enhancement tools (κ <0.25). For diagnostic accuracy, there was generally a low agreement (κ <0.45) between CBCT and microCT (gold standard). The percent accuracy ranged from 68.1% to 79.2% and was not different among raters, bracket presence/absence, or software choices (chi-square tests, P >0.05). Overall, diagnostic sensitivity was above 80%, whereas specificity was below 55%. CONCLUSIONS Despite good reliability, diagnoses of TAD-root contact using 400 μm voxel size CBCT imaging tend to be inaccurate, with a likelihood of high false-positive diagnoses.
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Affiliation(s)
- Soorya Srinivasan
- Division of Orthodontics, College of Dentistry, Ohio State University, Columbus, Ohio
| | - Boon Ching Tee
- Division of Biosciences, College of Dentistry, Ohio State University, Columbus, Ohio
| | - Amy Wang
- Division of Biology, College of Arts and Sciences, Ohio State University, Columbus, Ohio
| | - Anita Gohel
- Division of Oral and Maxillofacial Radiology, College of Dentistry, Ohio State University, Columbus, Ohio
| | - Do-Gyoon Kim
- Division of Orthodontics, College of Dentistry, Ohio State University, Columbus, Ohio
| | - Toru Deguchi
- Division of Orthodontics, College of Dentistry, Ohio State University, Columbus, Ohio
| | - Zongyang Sun
- Division of Orthodontics, College of Dentistry, Ohio State University, Columbus, Ohio.
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Ten years of miniscrew use in a U.S. orthodontic residency program. Am J Orthod Dentofacial Orthop 2020; 158:834-839. [DOI: 10.1016/j.ajodo.2019.11.015] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Revised: 11/01/2019] [Accepted: 11/01/2019] [Indexed: 11/22/2022]
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Dharmadeep G, Naik MK, Reddy YM, Cheruluri S, Praveen Raj K, Reddy BR. Three-dimensional Evaluation of Interradicular Areas and Cortical Bone Thickness for Orthodontic Miniscrew Implant Placement Using Cone-beam Computed Tomography. JOURNAL OF PHARMACY AND BIOALLIED SCIENCES 2020; 12:S99-S104. [PMID: 33149438 PMCID: PMC7595513 DOI: 10.4103/jpbs.jpbs_36_20] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2020] [Revised: 02/24/2020] [Accepted: 03/13/2020] [Indexed: 11/04/2022] Open
Abstract
Background Factors that influence anchorage of the orthodontic miniscrew implants are interradicular areas and cortical bone thickness. Aims and Objectives The aim of this study was to evaluate the three-dimensional interradicular areas and the buccal cortical bone thickness in Indian patients using cone beam computed tomography (CBCT) images, and to find the suitable and safe sites for orthodontic miniscrew implant placement. Materials and Methods CBCT images of 20 patients were divided into three planes as axial, coronal, and sagittal. Measurements, that is, mesiodistal distance and buccal cortical bone thickness were taken at five different heights from the cementoenamel junction (CEJ) toward apical region. Results In the maxilla, the safe sites for placing miniscrew implant were between the second premolar and first molar at 10-mm height, whereas in the mandible, the safe sites for placing miniscrew implant were between the first and second premolar at 6-, 8-, and 10-mm height, between the second premolar and first molar at 10-mm height, and between the first and second molar at 8- and 10-mm height. Conclusion CBCT can be effectively used to evaluate interradicular areas and cortical bone thickness in predicting the safe and suitable sites for placing orthodontic miniscrew implants.
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Affiliation(s)
- Garadappagari Dharmadeep
- Department of Orthodontics and Dentofacial Orthopedics, G. Pulla Reddy Dental College and Hospital, Kurnool, Andhra Pradesh, India
| | - Moode Kaladhar Naik
- Department of Orthodontics and Dentofacial Orthopedics, Government Dental College and Hospital, Kadapa, Andhra Pradesh, India
| | - Yellampalli Muralidhar Reddy
- Department of Orthodontics and Dentofacial Orthopedics, G. Pulla Reddy Dental College and Hospital, Kurnool, Andhra Pradesh, India
| | - Sreekanth Cheruluri
- Department of Orthodontics and Dentofacial Orthopedics, G. Pulla Reddy Dental College and Hospital, Kurnool, Andhra Pradesh, India
| | - Kranthi Praveen Raj
- Department of Orthodontics and Dentofacial Orthopedics, G. Pulla Reddy Dental College and Hospital, Kurnool, Andhra Pradesh, India
| | - Badepalli Reddeppa Reddy
- Department of Orthodontics and Dentofacial Orthopedics, G. Pulla Reddy Dental College and Hospital, Kurnool, Andhra Pradesh, India
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Cornelis MA, Tepedino M, Cattaneo PM, Nyssen-Behets C. Root repair after damage due to screw insertion for orthodontic miniplate placement. J Clin Exp Dent 2019; 11:e1133-e1138. [PMID: 31824593 PMCID: PMC6894909 DOI: 10.4317/jced.56472] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2019] [Accepted: 11/04/2019] [Indexed: 11/05/2022] Open
Abstract
Background The aim of this investigation was to describe the healing reactions following root damage caused by placement of a miniplate anchorage system. Material and Methods In 4 beagle dogs, 4 titanium miniplates (2 self-tapping screws per miniplate) were placed in each maxilla, after drilling of pilot-holes. Six fixation screws were unintentionally inserted damaging the root of maxillary canines. Two weeks later, half of the miniplates were loaded with a coil spring. Two dogs were euthanized 7 weeks after placement of the miniplates, while the remaining two after 29 weeks. Histological sections were prepared, microradiographed, observed under U.V. light, then stained and analysed under ordinary light. Results Four screws caused direct root damage; one was damaged during the drilling process; one caused damage to the periodontal ligament only. Among these 6 screws, 2 were mobile and 4 were stable at sacrifice. Limited root damage showed some repair after 29 weeks, consisting in a thick layer of mineralized cementum including anchoring periodontal fibres. Tissue repair was not related to screw stability or loading status. Conclusions Limited root damage has shown potential to heal, while extensive root damage has not. Precise position of insertion of the miniplates is thus of utmost importance. Key words:Temporary anchorage devices, animal studies, root resorption.
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Affiliation(s)
- Marie A Cornelis
- Associate Professor,Section of Orthodontics, Department of Dentistry and Oral Health, Aarhus University, Faculty of HEALTH, Vennelyst Boulevard 9, 8000 Aarhus, Denmark
| | - Michele Tepedino
- Associate lecturer, Department of Biotechnological and Applied Clinical Sciences, University of L'Aquila, Via Vetoio 2, 67100 L'Aquila, Italy
| | - Paolo M Cattaneo
- Associate Professor, Section of Orthodontics, Department of Dentistry and Oral Health, Aarhus University, Faculty of HEALTH, Vennelyst Boulevard 9, 8000 Aarhus, Denmark
| | - Catherine Nyssen-Behets
- Professor, Pôle de Morphologie, Institut de Recherche expérimentale et clinique, Université catholique de Louvain, Avenue Mounier 52 bte B1.52.04, 1200 Brussels, Belgium
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BAHIA MS, LOPES ALS, CAETANO PL, VITRAL RWF, CAMPOS MJDS. Análise do processo de corrosão na falha clínica de mini-implantes ortodônticos. REVISTA DE ODONTOLOGIA DA UNESP 2018. [DOI: 10.1590/1807-2577.14518] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Resumo Introdução Mini-implantes ortodônticos são dispositivos de ancoragem confeccionados à base de titânio, possuindo uma camada de óxido de titânio, que desempenha função importante na resistência à corrosão. Objetivo O objetivo deste estudo foi avaliar a resistência à corrosão e a microestrutura superficial de mini-implantes novos, utilizados que foram perdidos precocemente e os que obtiveram sucesso de estabilidade, analisando se o processo de corrosão influencia a falha ou a perda de estabilidade, a fim de se comparar com as principais causas de sucesso e insucesso clínico. Material e método A amostra foi composta por 3 grupos de 7 mini-implantes divididos da seguinte maneira: Grupo C: mini-implantes na sua forma original, como são recebidos do fabricante (controle); Grupo PE: mini-implantes utilizados em pacientes e que apresentaram perda de estabilidade precoce em até 2 meses (média de 33,5 dias); Grupo E: mini-implantes utilizados em pacientes com sucesso de estabilidade (média de 230 dias). A análise visual da superfície da rosca dos mini-implantes foi feita através de microscópio eletrônico de varredura e todos foram submetidos a ensaio de polarização cíclica potenciodinâmica em potenciostato. Resultado A microestrutura superficial não foi significativamente alterada pela permanência e perda precoce de estabilidade em seus sítios ósseos. Conclusão Os dados sugeriram que a corrosão não foi fator associado à falha do dispositivo ou perda de sua estabilidade, sendo outros fatores, como o tipo do mini-implante, o seu comprimento e o local de implantação, considerados mais preponderantes com influência no seu insucesso.
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Oh HJ, Cha JY, Yu HS, Hwang CJ. Histomorphometric evaluation of the bone surrounding orthodontic miniscrews according to their adjacent root proximity. Korean J Orthod 2018; 48:283-291. [PMID: 30206527 PMCID: PMC6123080 DOI: 10.4041/kjod.2018.48.5.283] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2017] [Revised: 02/01/2018] [Accepted: 02/07/2018] [Indexed: 11/14/2022] Open
Abstract
Objective This study was conducted to perform histomorphometric evaluations of the bone surrounding orthodontic miniscrews according to their proximity to the adjacent tooth roots in the posterior mandible of beagle dogs. Methods Four male beagle dogs were used for this study. Six orthodontic miniscrews were placed in the interradicular spaces in the posterior mandible of each dog (n = 24). The implanted miniscrews were classified into no loading, immediate loading, and delayed loading groups according to the loading time. At 6 weeks after screw placement, the animals were sacrificed, and tissue blocks including the miniscrews were harvested for histological examinations. After analysis of the histological sections, the miniscrews were categorized into three additional groups according to the root proximity: high root proximity, low root proximity, and safe distance groups. Differences in the bone–implant contact (BIC, %) among the root proximity groups and loading time groups were determined using statistical analyses. Results No BIC was observed within the bundle bone invaded by the miniscrew threads. Narrowing of the periodontal ligament space was observed in cases where the miniscrew threads touched the bundle bone. BIC (%) was significantly lower in the high root proximity group than in the low root proximity and safe distance groups. However, BIC (%) showed no significant differences among the loading time groups. Conclusions Regardless of the loading time, the stability of an orthodontic miniscrew is decreased if it is in contact with the bundle bone as well as the adjacent tooth root.
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Affiliation(s)
| | - Jung-Yul Cha
- Department of Orthodontics, The Institute of Cranio-Facial Deformity, College of Dentistry, Yonsei University, Seoul, Korea
| | - Hyung-Seog Yu
- Department of Orthodontics, The Institute of Cranio-Facial Deformity, College of Dentistry, Yonsei University, Seoul, Korea
| | - Chung-Ju Hwang
- Department of Orthodontics, The Institute of Cranio-Facial Deformity, College of Dentistry, Yonsei University, Seoul, Korea
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Oba MK, Marañón-Vásquez GA, Romano FL, Oliveira-Santos C. Additional intraoral radiographs may change the judgment regarding the final position of orthodontic mini-implants. Dental Press J Orthod 2018; 23:54-61. [PMID: 29898158 PMCID: PMC6018447 DOI: 10.1590/2177-6709.23.2.054-061.oar] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2017] [Accepted: 12/13/2017] [Indexed: 11/24/2022] Open
Abstract
Objective: This study aimed to assess if additional vertical bitewing (VBW) and/or occlusal (OC) radiographs may change initial judgment based only on periapical radiograph (PAR) about the final position of orthodontic mini-implants (OMI). Methods: Subjective and objective analyses were performed. Radiographic images of 26 OMI were divided into four groups: PAR, PAR+VBW, PAR+OC and ALL (PAR+VBW+OC). For subjective analysis, five observers were asked to assess if the position of OMI was favorable to its success, using questionnaires with a four-point scale for responses: 1= definitely not favorable, 2= probably not favorable, 3= probably favorable, or 4= definitely favorable. Each group containing sets of images was presented to them in four different viewing sessions. Objective evaluation compared horizontal distances between OMI tip and the root nearest to the device in PAR and VBW. Results: Most of observers (3 out of 5) changed their initial judgment based on PAR about OMI position when additional radiographs were analyzed. Differences between groups (i.e. PAR vs. PAR+VBW; PAR vs. PAR+OC; and, PARvs.ALL) were statistically significant for these observers. For those that changed their judgment about OMI position, confidence level could significantly increase, decrease or even be maintained, not indicating a pattern. There was no agreement for distances between OMI tip and the root nearest to the device in PAR and VBW. Conclusion: Considering the limitations of the study, it is concluded that additional radiographic images may change the judgement about OMI final position without necessarily increasing the degree of certainty of such judgment.
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Affiliation(s)
- Marina K Oba
- Universidade de São Paulo, Hospital das Clínicas, Faculdade de Medicina de Ribeirão Preto, Residência em Atenção Multiprofissional ao Câncer (Ribeirão Preto/SP, Brazil)
| | - Guido A Marañón-Vásquez
- Universidade de São Paulo, Faculdade de Odontologia de Ribeirão Preto, Departamento de Clínica Infantil, Ortodontia (Ribeirão Preto/SP, Brazil)
| | - Fábio L Romano
- Universidade de São Paulo, Faculdade de Odontologia de Ribeirão Preto, Departamento de Clínica Infantil, Ortodontia (Ribeirão Preto/SP, Brazil)
| | - Christiano Oliveira-Santos
- Universidade de São Paulo, Faculdade de Odontologia de Ribeirão Preto, Departamento de Estomatologia, Saúde Coletiva e Odontologia Legal, Radiologia (Ribeirão Preto/SP, Brazil)
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Gandedkar NH, Koo CS, Sharan J, Chng CK, Vaid N. The temporary anchorage devices research terrain: Current perspectives and future forecasts! Semin Orthod 2018. [DOI: 10.1053/j.sodo.2018.01.014] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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On the stability efficiency of anchorage self-tapping screws: Ex vivo experiments on miniscrew implants used in orthodontics. J Mech Behav Biomed Mater 2018; 81:46-51. [PMID: 29482179 DOI: 10.1016/j.jmbbm.2018.02.019] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2017] [Revised: 02/15/2018] [Accepted: 02/17/2018] [Indexed: 11/20/2022]
Abstract
BACKGROUND The clinical success of orthodontic miniscrews is strictly related to primary stability, which depends on bone viscoelastic properties too. In this study, we evaluated the short time mechanical response of native bone to miniscrews, by a laboratory test based on dynamic loading. METHODS Thirty-six segments of porcine ribs were first scanned by cone-beam computerized tomography to obtain insertion-site cortical thickness, cortical and marrow bone density. Twelve different types of miniscrews were implanted in the bone samples to evaluate the elastic compliance of the implants in response to a point force applied at the screw head normally to the screw axis. The compliance was measured dynamically in a Dynamic Mechanical Analysis apparatus as the Fourier Response Function between the signals of displacement and force. The measurements were repeated in five days successive to the insertion of the miniscrew. FINDINGS The elastic compliance was positively related to observation timepoints, but it was not related neither to the screw type nor to the value of the insertion torque. INTERPRETATION Stability behavior is significantly related to the short time response of native bone rather than to the screw design or the insertion torque values.
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Baumgaertel S, Jones CL, Unal M. Miniscrew biomechanics: Guidelines for the use of rigid indirect anchorage mechanics. Am J Orthod Dentofacial Orthop 2017; 152:413-419. [PMID: 28863922 DOI: 10.1016/j.ajodo.2017.04.020] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2016] [Revised: 04/01/2017] [Accepted: 04/01/2017] [Indexed: 10/19/2022]
Abstract
Indirect anchorage is an established form of anchorage provided by orthodontic miniscrews. Although there are different ways to set up the mechanics, rigid indirect anchorage offers the greatest biomechanical versatility but is more difficult to install than conventional, nonrigid indirect anchorage or direct anchorage. The purpose of this article was to introduce readers to the concept of rigid indirect anchorage and provide guidelines as to its use.
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Affiliation(s)
- Sebastian Baumgaertel
- Department of Orthodontics, School of Dental Medicine, Case Western Reserve University, Cleveland, Ohio.
| | | | - Mustafa Unal
- Orthopaedic Bioengineering Laboratory, Department of Mechanical and Aerospace Engineering, Case Western Reserve University, Cleveland, Ohio
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Nguyen MV, Codrington J, Fletcher L, Dreyer CW, Sampson WJ. Influence of cortical bone thickness on miniscrew microcrack formation. Am J Orthod Dentofacial Orthop 2017; 152:301-311. [DOI: 10.1016/j.ajodo.2016.12.028] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2016] [Revised: 12/01/2016] [Accepted: 12/01/2016] [Indexed: 11/17/2022]
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Prognosis of primary and secondary insertions of orthodontic miniscrews: What we have learned from 500 implants. Am J Orthod Dentofacial Orthop 2017; 152:224-231. [PMID: 28760284 DOI: 10.1016/j.ajodo.2016.12.021] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2016] [Revised: 12/01/2016] [Accepted: 12/01/2016] [Indexed: 12/17/2022]
Abstract
INTRODUCTION Although the success of using orthodontic miniscrews for primary insertion has been reported in the literature, few studies have followed up on secondary insertions after failure of the first insertion. In this study, we investigated not only the primary but also secondary success rates of miniscrews and considered the risk factors influencing their stability. METHODS Five hundred miniscrews were inserted for orthodontic anchorage in 240 patients. Ninety-eight miniscrews lacked stability; thus, 77 of these were removed and reinserted. We calculated and compared the primary and secondary success rates of insertion. Moreover, we investigated which clinical parameters affected the stability of miniscrews. RESULTS The success rate of secondary insertion (44.2%) was significantly lower than that of primary insertion (80.4%). The screw length and jaw receiving the insertion were significantly associated with the stability of miniscrews. The 8.0-mm miniscrews were significantly more stable than the 6.0-mm miniscrews, and the success rate for insertions into the maxilla was significantly higher than that for the mandible. CONCLUSIONS Secondary insertions lack stability; therefore, clinicians should be aware of the reduced success rate of reinsertion and know the risk factors to avoid failure of secondary insertions.
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Abstract
INTRODUCTION We aimed to evaluate the associations between the craniofacial growth pattern with interradicular distances (IRDs), cortical widths (CWs), and jaw heights (JHs). Also, we mapped safe zones for miniscrew implantation. METHODS Cone-beam computerized tomography data pertaining to 60 Class-I patients were divided into 3 growth groups: normal, horizontal, and vertical. IRDs and CWs were measured for bimaxillary canines to second molars, on buccal and lingual sides, at 3 transverse planes (1, 3, and 5 mm apically to the alveolar crest). JHs were measured in both jaws, between canines and second molars. The role of growth patterns and other variables were analyzed; also, safe zones were mapped with statistical substantiation. RESULTS IRDs were greater in the mandible, males, at points more distant from the ridge crest, and on the lingual side. Cortexes were thicker in the horizontal growth pattern, mandible, males, older patients, and lingual sides. JHs were greater in vertical growth pattern, mandible, and males. CONCLUSIONS The cortex might be thicker in patients with a horizontal growth pattern. The height might be greater in vertical growth pattern. IRDs might not be affected by growth pattern.
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Finite Element Analysis of Bone Stress for Miniscrew Implant Proximal to Root Under Occlusal Force and Implant Loading. J Craniofac Surg 2015. [PMID: 26207429 DOI: 10.1097/scs.0000000000001969] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
Because of the narrow interradicular spaces and varying oral anatomies of individual patients, there is a very high risk of root proximity during the mini implants inserting. The authors hypothesized that normal occlusal loading and implant loading affected the stability of miniscrew implants placed in proximity or contact with the adjacent root. The authors implemented finite element analysis (FEA) to examine the effectiveness of root proximity and root contact. Stress distribution in the bone was assessed at different degrees of root proximity by generating 4 finite element models: the implant touches the root surface, the implant was embedded in the periodontal membrane, the implant touches the periodontal surface, and the implant touches nothing. Finite element analysis was then carried out with simulations of 2 loading conditions for each model: condition A, involving only tooth loading and condition B, involving both tooth and implant loading. Under loading condition A, the maximum stress on the bone for the implant touching the root was the distinctly higher than that for the other models. For loading condition B, peak stress areas for the implant touching the root were the area around the neck of the mini implant and the point of the mini implant touches the root. The results of this study suggest that normal occlusal loading and implant loading contribute to the instability of the mini implant when the mini implant touches the root.
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Abstract
Various factors influence where orthodontic mini-implants will be placed. This article highlights the pertinent variables that should find consideration when planning the placement of orthodontic mini-implants.
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Affiliation(s)
- Sebastian Baumgaertel
- Department of Orthodontics, School of Dental Medicine, Case Western Reserve University, Cleveland, OH, USA
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Bremen JV, Ludwig B, Ruf S. Anchorage loss due to Herbst mechanics—preventable through miniscrews? Eur J Orthod 2014; 37:462-6. [DOI: 10.1093/ejo/cju058] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Kuroda S, Tanaka E. Risks and complications of miniscrew anchorage in clinical orthodontics. JAPANESE DENTAL SCIENCE REVIEW 2014. [DOI: 10.1016/j.jdsr.2014.05.001] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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Yoo SH, Park YC, Hwang CJ, Kim JY, Choi EH, Cha JY. A comparison of tapered and cylindrical miniscrew stability. Eur J Orthod 2013; 36:557-62. [PMID: 24355870 DOI: 10.1093/ejo/cjt092] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
OBJECTIVES This study compared the stability of tapered miniscrews with cylindrical miniscrews. MATERIALS/METHODS One hundred and five tapered and 122 cylindrical self-drilling miniscrews were placed into the maxillary and mandibular buccal alveolar areas of 132 patients (43 males and 89 females). The insertion torque and removal torque were measured and Periotest values (PTVs) were recorded at implantation. RESULTS The success rates of the tapered and cylindrical miniscrews examined were similar. In the maxilla, the insertion torque of the tapered miniscrews (8.3 Ncm) was significantly higher than that of the cylindrical miniscrews (6.3 Ncm) (P < 0.05). The PTVs of the tapered miniscrews were statistically significantly lower in the maxilla (P < 0.05). The removal torque values showed no significant difference between the tapered and cylindrical miniscrews in the upper and lower buccal areas (P > 0.05). CONCLUSIONS Tapered miniscrews had higher initial stability when compared to cylindrical miniscrews, whereas the clinical success rates and removal torques were similar between the two designs. The long-term stability is not directly affected by the miniscrew design.
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Affiliation(s)
- Seong-Hun Yoo
- *Department of Orthodontics, College of Dentistry and Institute of Craniofacial Deformity, Yonsei University, Seoul, and
| | - Young-Chel Park
- *Department of Orthodontics, College of Dentistry and Institute of Craniofacial Deformity, Yonsei University, Seoul, and
| | - Chung-Ju Hwang
- *Department of Orthodontics, College of Dentistry and Institute of Craniofacial Deformity, Yonsei University, Seoul, and
| | - Ji-Young Kim
- *Department of Orthodontics, College of Dentistry and Institute of Craniofacial Deformity, Yonsei University, Seoul, and
| | - Eun-Hee Choi
- **Institute of Lifestyle Medicine, Wonju College of Medicine, Yonsei University, South Korea
| | - Jung-Yul Cha
- *Department of Orthodontics, College of Dentistry and Institute of Craniofacial Deformity, Yonsei University, Seoul, and,
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Pan F, Kau CH, Zhou H, Souccar N. The anatomical evaluation of the dental arches using cone beam computed tomography--an investigation of the availability of bone for placement of mini-screws. Head Face Med 2013; 9:13. [PMID: 23601073 PMCID: PMC3662167 DOI: 10.1186/1746-160x-9-13] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2012] [Accepted: 03/11/2013] [Indexed: 11/11/2022] Open
Abstract
Objective To assess the amount of maxillary and mandibular inter-radicular bone mass and determine the most reliable mini-screw placement sites. Materials and methods Retrospective Cone Beam Computed Tomography (CBCT) images of 40 Angle Class I subjects (20 females, 20 males, aged 16 to 32) were obtained. Measurements on the buccal (BI), medial (MI) and lingual (LI) sides of the inter-radicular spaces were taken at 0, 1, 2, 3, 4, 5 mm from the cemento-enamel junction (CEJ) in an apical direction. Results The male and female BI scores ranged from 2.99±0.73 mm to 6.18±1.03 mm and 2.69±0.84 mm to 6.21±1.22 mm respectively. The male and female MI scores ranged from 1.36±0.38 mm to 4.50±0.99 and 1.53±0.66 to 4.77±1.99 mm respectively. LI scores ranged from 2.37±0.70 to 6.47±1.0 mm and 2.45±0.56 mm and 6.66±1.33 mm respectively. In both maxillary and mandibular arch, the inter-radicular space increased in the apical direction except for the buccal and medial inter-radicular spaces between the maxillary first and second molars. Conclusion The medial inter-radicular spaces are the decisive parameter for mini-screw placement. In the maxillary arch, regions between central and lateral incisors, lateral incisor and canine, first and second molars are not viable for mini-screw insertion. The residual inter-radicular regions are proper for implantation at 3 mm above the CEJ. In the mandible, the regions between incisors and canines are too narrow for mini-screw insertion and the reliable sites for mini-screws are regions between premolars, molars or first molar and second premolar at 2 mm below the CEJ.
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Cho IS, Kim TW, Ahn SJ, Yang IH, Baek SH. Effects of insertion angle and implant thread type on the fracture properties of orthodontic mini-implants during insertion. Angle Orthod 2012; 83:698-704. [DOI: 10.2319/082812-689.1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
ABSTRACT
Objective:
To determine the effects of insertion angle (IA) and thread type on the fracture properties of orthodontic mini-implants (OMIs) during insertion.
Materials and Methods:
A total of 100 OMIs (self-drilling cylindrical; 11 mm in length) were allocated into 10 groups according to thread type (dual or single) and IA (0°, 8°, 13°, 18°, and 23°) (n = 10 per group). The OMIs were placed into artificial materials simulating human tissues: two-layer bone blocks (Sawbones), root (polymethylmethacrylate stick), and periodontal ligament (Imprint-II Garant light-body). Maximum insertion torque (MIT), total insertion energy (TIE), and peak time (PT) were measured and analyzed statistically.
Results:
There were significant differences in MIT, TIE, and PT among the different IAs and threads (all P < .001). When IA increased, MIT increased in both thread groups. However, TIE and PT did not show significant differences among 0°, 8°, and 13° IAs in the dual-thread group or 8°, 13°, and 18° IAs in the single-thread group. The dual-thread groups showed higher MIT at all IAs, higher TIE at 0° and 23° IAs, and longer PT at a 23° IA than the single-thread groups. In the 0°, 8°, and 13° IA groups, none of the OMIs fractured or became deformed. However, in the 18° IA group, all the OMIs were fractured or deformed. Dual-thread OMIs showed more fracturing than deformation compared to single-thread OMIs (P < .01). In the 23° IA group, all OMIs penetrated the artificial root without fracturing and deformation.
Conclusions:
When OMIs contact artificial root at a critical contact angle, the deformation or fracture of OMIs can occur at lower MIT values than those of penetration.
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Affiliation(s)
- Il-Sik Cho
- Graduate Student (PhD), Department of Orthodontics, School of Dentistry, Seoul National University; Clinical Instructor, Department of Dentistry, Korea University Guro Hospital, Seoul, South Korea
| | - Tae-Woo Kim
- Professor, Department of Orthodontics, School of Dentistry, Dental Research Institute, Seoul National University, Seoul, South Korea
| | - Sug-Joon Ahn
- Associate Professor, Department of Orthodontics, School of Dentistry, Dental Research Institute, Seoul National University, Seoul, South Korea
| | - Il-Hyung Yang
- Assistant Professor, Department of Orthodontics, School of Dentistry, Dental Research Institute, Seoul National University, Seoul, South Korea
| | - Seung-Hak Baek
- Professor, Department of Orthodontics, School of Dentistry, Dental Research Institute, Seoul National University, Seoul, South Korea
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Alves M, Baratieri C, Araújo M, Souza M, Maia L. Root damage associated with intermaxillary screws: a systematic review. Int J Oral Maxillofac Surg 2012; 41:1445-50. [DOI: 10.1016/j.ijom.2012.05.019] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2011] [Revised: 03/13/2012] [Accepted: 05/16/2012] [Indexed: 11/26/2022]
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Ahn HW, Chung KR, Kang SM, Lin L, Nelson G, Kim SH. Correction of dental Class III with posterior open bite by simple biomechanics using an anterior C-tube miniplate. Korean J Orthod 2012; 42:270-8. [PMID: 23173121 PMCID: PMC3495259 DOI: 10.4041/kjod.2012.42.5.270] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2012] [Revised: 07/30/2012] [Accepted: 08/22/2012] [Indexed: 11/29/2022] Open
Abstract
In the correction of dental Class III molar relationship in skeletal Class II patients, uprighting of the mandibular posterior segments without opening the mandible is an important treatment objective. In the case reported herein, a C-tube miniplate fixed to the lower labial symphysis and connected with a nickel-titanium reverse-curved archwire provided effective uprighting of the lower molars, without the need of orthodontic appliances on the mandibular anteriors. Using this approach, an appropriate magnitude of force is exerted on the molars while avoiding any negative effect on the mandibular anteriors.
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Affiliation(s)
- Hyo-Won Ahn
- Department of Orthodontics, School of Dentistry, Kyung Hee University, Seoul, Korea
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Janson G, Gigliotti MP, Estelita S, Chiqueto K. Influence of miniscrew dental root proximity on its degree of late stability. Int J Oral Maxillofac Surg 2012; 42:527-34. [PMID: 23062958 DOI: 10.1016/j.ijom.2012.09.010] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2011] [Revised: 06/06/2012] [Accepted: 09/18/2012] [Indexed: 11/27/2022]
Abstract
Purpose of this study was to evaluate the influence of miniscrew dental root proximity on its late stability degree. 40 miniscrews were inserted between maxillary second premolars and first molars for anterior retraction. Post-surgical radiographs were used to measure the septum width in the insertion site, insertion height, distal and mesial distance from miniscrew to dental root, and the smallest distance between miniscrew and dental root. The miniscrews were divided in two groups according to septum width: ≤3 mm (20 miniscrews) and >3 mm (20 miniscrews). The soft tissue in the insertion site, sensitivity during load, plaque around the miniscrew, and evaluation period were also considered. The results showed no significant difference in miniscrew mobility degree and success rate between groups. Miniscrew dental root proximity did not influence the stability and success rate when the distance between the miniscrew and dental root indicated no periodontal ligament invasion. The overall success rate was 90% and no variable was associated with miniscrew failure. Nevertheless, patient sensitivity was frequently associated with some degree of mini-implant mobility. The septum width did not influence the stability and success rate of this anchorage system, but the extreme root proximity did.
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Affiliation(s)
- G Janson
- Department of Orthodontics, Bauru Dental School, University of São Paulo, Brazil
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Schulte-Geers M, Kater W, Seeberger R. Root trauma and tooth loss through the application of pre-drilled transgingival fixation screws. J Craniomaxillofac Surg 2012; 40:e214-7. [DOI: 10.1016/j.jcms.2011.10.022] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2011] [Revised: 10/07/2011] [Accepted: 10/10/2011] [Indexed: 10/15/2022] Open
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Sebbar M, Bourzgui F, Lazrak L, Aazzab B, El Quars F. [Microscopic comparison of the miniscrew's surface used in orthodontics: before and after use]. ACTA ACUST UNITED AC 2012; 113:365-9. [PMID: 22695247 DOI: 10.1016/j.stomax.2012.04.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2011] [Revised: 12/20/2011] [Accepted: 04/30/2012] [Indexed: 10/28/2022]
Abstract
INTRODUCTION The aim of our work is to study the modifications affecting the surface condition of miniscrews retrieved from patients following an orthodontic treatment and comparing these miniscrews to unused ones. MATERIAL AND METHODS This study involved ten miniscrews placed in seven patients after orthodontic treatment for various indications. These miniscrews of the same manufacturer (Dual Top Anchor System® [Jeil Medical Corporation, Seoul, Korea]) were observed under optical microscope (Leica DM2500M) in order to examine their surface. Four new Miniscrews of different manufacturers, including the manufacturer of Miniscrews trademarks patients (Abso Anchor [Dentos, Daegu, South Korea] Infiniti [DB Orthodontics, Silsden, West Yorkshire, UK], Dual Top(®) [Jeil Medical Corporation, Seoul, Korea], IMTEC(®) [Ardmore, Okla]) were examined under the same microscope to compare with the used miniscrews. RESULTS The study of the new miniscrews showed an irregular surface with machining and polishing defects, in the form of stripes that could constitute election's point for electrochemical attacks. Compared with the new one, the miniscrew used showed pitting corrosion attacks and cracks, mainly in the machining defects. These attacks were localized over the whole of miniscrews. DISCUSSION It is suggested that improving the surface finish can increase the corrosion resistance of these miniscrews.
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Affiliation(s)
- M Sebbar
- Département d'Orthopédie Dentofaciale, Faculté de Médecine Dentaire, Université Hassan II Ain Chok, Casablanca, Maroc.
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Alves M, Baratieri C, Mattos CT, Araujo MTDS, Maia LC. Root repair after contact with mini-implants: systematic review of the literature. Eur J Orthod 2012; 35:491-9. [DOI: 10.1093/ejo/cjs025] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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30
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Widar F, Kashani H, Kanagaraja S, Dahlin C, Rasmusson L. A retrospective evaluation of iatrogenic dental root damage with predrilled vs drill-free bone anchor screws for intermaxillary fixation. Dent Traumatol 2011; 28:127-31. [DOI: 10.1111/j.1600-9657.2011.01051.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Kim H, Kim TW. Histologic evaluation of root-surface healing after root contact or approximation during placement of mini-implants. Am J Orthod Dentofacial Orthop 2011; 139:752-60. [PMID: 21640881 DOI: 10.1016/j.ajodo.2009.06.042] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2009] [Revised: 06/01/2009] [Accepted: 06/01/2009] [Indexed: 10/18/2022]
Abstract
INTRODUCTION Placement of mini-implants carries with it the risk of iatrogenic damage to the adjacent root surfaces. The aims of this study were to assess the type of trauma incurred on tooth roots after contact or approximation with mini-implants during placement, and to observe and analyze the healing responses via histologic analysis. METHODS Four male minipigs were used as experimental subjects. Twenty mini-implants (1.6 × 8 mm) were implanted in each minipig into the buccal sides of all 4 quadrants between the roots of teeth so that contact or approximation between the mini-implant and root surface occurred, with the aid of dental fluoroscopy. All mini-implants on the left side of the mouth were left in situ, and all mini-implants on the right side were removed immediately after placement. The minipigs were killed at 4-week intervals up to week 16, and histologic sections were made. RESULTS When mini-implants were left in situ, the root surface was mostly resorbed away from the mini-implant thread. Partial repair started at 8 weeks. When the mini-implant thread was left touching the root, there was no normal healing response. If the mini-implant was placed less than 1 mm from the periodontal ligament, resorption was evident on the root surface. Abnormal healing responses were seen when the pulp tissue was ruptured, mostly through osteodentin formation. In all instances after mini-implant removal immediately after placement, varying degrees of cementum repair was observed. CONCLUSIONS Immediate removal of the mini-implant leads to cementum repair, whereas leaving the mini-implant in place will cause either a delay in repair or no repair. Placing mini-implants less than 1 mm from the root surface causes root-surface resorption.
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Affiliation(s)
- Hyewon Kim
- Department of Orthodontics, School of Dentistry and Dental Research Institute, Seoul National University, Seoul, Korea
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Gigliotti MP, Janson G, Barros SEC, Chiqueto K, Freitas MRD. Influência da largura do septo inter-radicular sobre a estabilidade dos mini-implantes. Dental Press J Orthod 2011. [DOI: 10.1590/s2176-94512011000200005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
OBJETIVO: este estudo teve como objetivo avaliar a influência da largura do septo inter-radicular no local de inserção de mini-implantes autoperfurantes sobre o grau de estabilidade desses dispositivos de ancoragem. MÉTODOS: a amostra consistiu de 40 mini-implantes inseridos entre as raízes do primeiro molar e segundo pré-molar superiores de 21 pacientes, com o intuito de fornecer ancoragem para retração anterior. A largura do septo no local de inserção (LSI) foi mensurada nas radiografias pós-cirúrgicas e, sob esse aspecto, os mini-implantes foram divididos em dois grupos: grupo 1 (áreas críticas, LSI<3mm) e grupo 2 (áreas não críticas, LSI>3mm). A estabilidade dos mini-implantes foi avaliada mensalmente pela quantificação do grau de mobilidade e a partir dessa variável foi calculada a proporção de sucesso. Avaliou-se também: a quantidade de placa, altura de inserção, grau de sensibilidade e período de observação. RESULTADOS: os resultados obtidos demonstraram que não houve diferença estatisticamente significativa para o grau de mobilidade e proporção de sucesso entre os mini-implantes inseridos em septos de largura mesiodistal crítica e não crítica. A proporção de sucesso total encontrada foi de 90% e nenhuma variável demonstrou estar relacionada ao insucesso dos mini-implantes. No entanto, observou-se maior sensibilidade nos pacientes cujos mini-implantes apresentavam mobilidade, e que a falha desses dispositivos de ancoragem ocorria logo após sua inserção. CONCLUSÃO: a largura do septo inter-radicular no local de inserção não interferiu na estabilidade dos mini-implantes autoperfurantes avaliados neste estudo.
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Yu WJ, Kim MR, Park HS, Kyung HM, Kwon OW. Finite element analysis of peri-implant bone stresses induced by root contact of orthodontic microimplant. ACTA ACUST UNITED AC 2011. [DOI: 10.4041/kjod.2011.41.1.6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Won-Jae Yu
- Associate Professor, Department of Orthodontics, School of Dentistry, Kyungpook National University, Korea
| | - Mi-Ryoung Kim
- Graduate Student, Department of Orthodontics, School of Dentistry, Kyungpook National University, Korea
| | - Hyo-Sang Park
- Professor, Department of Orthodontics, School of Dentistry, Kyungpook National University, Korea
| | - Hee-Moon Kyung
- Professor, Department of Orthodontics, School of Dentistry, Kyungpook National University, Korea
| | - Oh-Won Kwon
- Professor, Department of Orthodontics, School of Dentistry, Kyungpook National University, Korea
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Two-dimensional radiographic and clinical references of the tooth crown for orthodontic mini-implant insertion: A guide-free technique. ACTA ACUST UNITED AC 2010; 110:e8-16. [DOI: 10.1016/j.tripleo.2010.05.063] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2010] [Revised: 05/24/2010] [Accepted: 05/24/2010] [Indexed: 11/20/2022]
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36
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Manni A, Cozzani M, Tamborrino F, De Rinaldis S, Menini A. Factors influencing the stability of miniscrews. A retrospective study on 300 miniscrews. Eur J Orthod 2010; 33:388-95. [PMID: 20926556 DOI: 10.1093/ejo/cjq090] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The aim of this study was to investigate, over a period of approximately 3 years, the reactions to orthodontic loading of a type V titanium miniscrew. In this retrospective study, conducted in a private practice, the records of 300 miniscrews inserted in 132 consecutive patients (80 females, 60.6 percent) by the same surgeon were evaluated. The mean age of the patients was 23.2 years. Three types of miniscrews (type A: diameter 1.5 mm, length 9 mm; type B: diameter 1.5 mm, length 11 mm; and type C: diameter 1.3 mm, length 11 mm) were used. The clinical variables evaluated included the loading time and location of the miniscrew in relation to the gingiva and root. The success rates with different variables were compared using chi-square or Fisher's exact test where appropriate. A cumulative survival rate of 81 percent (243/300) was found using Kaplan-Meier analysis, with an optimum success rate for the 1.3 mm wide miniscrew inserted in the attached gingiva, with immediate loading applied. Cox proportional hazard regression showed significant differences between success rate and the following parameters: gender, loading time, gingival or bone localization, and diameter of the miniscrews. Considering the clinically controllable parameters, and within the limits of this retrospective study, 1.3 mm diameter miniscrews inserted in attached gingiva and immediately loaded had the most favourable prognosis.
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Park J, Cho HJ. Three-dimensional evaluation of interradicular spaces and cortical bone thickness for the placement and initial stability of microimplants in adults. Am J Orthod Dentofacial Orthop 2009; 136:314.e1-12; discussion 314-5. [DOI: 10.1016/j.ajodo.2009.01.023] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2008] [Revised: 01/01/2009] [Accepted: 01/01/2009] [Indexed: 10/20/2022]
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Zhao L, Xu Z, Yang Z, Wang J, Wei X, Tang T, Zhao Z. Quantitative research using computed tomographic scanning of beagle jaws for determination of safe zones for micro-screw implantation. Ann Anat 2009; 191:379-88. [DOI: 10.1016/j.aanat.2009.03.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2008] [Revised: 03/31/2009] [Accepted: 03/31/2009] [Indexed: 10/20/2022]
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