교정용 미니스크류의 디자인에 따른 식립 및 제거 토오크
Insertion and removal torques according to orthodontic mini-screw design
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교정용 미니스크류의 원추 형태가 식립 후 시기별 안정성에 미치는 영향을 알아보기 위해, 시기별 제거 토오크 및 동요도와 조직시편분석을 시행하였다. 성견 6마리의 하악 협측골에 원통형과 원추형 교정용 미니스크류 (Biomaterials Korea, Seoul, Korea) 48개를 식립하고, 식립 시 식립 토오크와 동요도를 측정하고 3주, 12주 동안 교정력을 부여한 후, 제거 시 제거 토오크와 동요도를 측정하였다. 식립 토오크는 원통형 미니스크류에서 13.6 Ncm, 원추형 미니스크류에서 22.3 Ncm로 원추형 미니스크류에서 높은 식립 토오크가 측정되었다 (p < 0.001). 식립 3 주째 제거 토오크는 원통형 미니스크류에서 5.7 Ncm, 원추형 미니스크류에서 9.1 Ncm로 유의한 차이가 관찰되었다 (p < 0.05). 식립 12주째 원추형 미니스크류의 제거 토오크는 3.6 Ncm로 유의하게 감소하여(p < 0.05) 원통형 미니스크류의 4.2 Ncm와 유의한 차이를 보이지 않았다. 이상의 결과로 미니스크류의 원추 구조는 식립 토오크를 유의하게 증가시켜 식립 후 3주간 안정성에 도움이 되었으나, 12주 후 안정성에 있어서는 원통형 미니스크류와 유사하였음을 시사한다.
Abstract
Objective: This study was designed to analyze the primary and secondary stability characteristics of orthodontic mini-screws of tapered design when compared with the cylinder mini-screw. Methods: A total of 48 mini-screws were placed into the buccal alveolar bone of the mandible in 6 male beagle dogs. Comparison was made between tapered and cylinder type mini-screws (Biomaterials Korea, Seoul, Korea). Maximum insertion torque (MIT) was measured using a torque sensor (Mark-10, MGT 50, USA) during installation, and maximum removal torque (MRT) was recorded after 3 and 12 weeks of loading. Results: Taper mini-screws showed a higher MIT value of 22.3 Ncm compared with cylinder mini-screw showing 13.6 Ncm (p < 0.001). The MRT of the taper mini-screw showed a significantly higher value of 9.1 Ncm than those of cylinder mini-screw of 5.7 Ncm at 3-weeks after installation (p < 0.05). However, there was no difference in the MRT value between the taper and cylinder mini-screws at 12 weeks of loading. Conclusions: These results showed that the high insertion torque of the taper mini-screw design increases initial stability until 3 weeks of loading, but does not have any effect on the secondary stability at 12 weeks of loading.
참고문헌 (24)
- Chen CH, "The use of microimplants in orthodontic anchorage", J Oral Maxillofac Surg, 64, pp.1209~1213 (2006)
- Buchter A, "Load-related implant reaction of mini-implants used for orthodontic anchorage", Clin Oral Implants, 16, pp.473~479 (2005)
- Joos U, "Strain driven fast osseointegration of implants", Head Face Med, 1, pp.6~ (2005)
- Huja SS, "Pull-out strength of monocortical screws placed in the maxilla and mandibles of dogs", Am J Orthod Dentofacial Orthop, 127, pp.307~313 (2005)
- Brown GA, "Mechanical performance of standard and cannulated 4.0-mm cancellous bone screws", J Orthop Res, 18, pp.307~312 (2000)
- Heidemann W, "Influence of different pilot hole sizes on torque measurements and pullout analysis of osteosynthesis screws", J Craniomaxillofac Surg, 26, pp.50~55 (1998)
- Miyawaki S, "Factors associated with the stability of titanium screws placed in the posterior region for orthodontic anchorage", Am J Orthod Dentofacial Orthop, 124, pp.373~378 (2003)
- Cheng SJ, "A prospective study of the risk factors associated with failure of mini-implants used for orthodontic anchorage", Int J Oral Maxillofac Implants, 19, pp.100~106 (2004)
- Motoyoshi M, "Recommended placement torque when tightening an orthodontic mini-implant", Clin Oral Implants Res, 17, pp.109~114 (2006)
- Meredith N, "Assessment of implant stability as a prognostic determinant", Int J Prosthodont, 11, pp.491~501 (1998)
- Ueda M, "Relationship between insertion torque and removal torque analyzed in fresh temporal bone", Int J Oral Maxillofac Implants, 6, pp.442~447 (1991)
- Frost HM, "Bone's mechanostat: a 2003 update", Anat Rec A Discov Mol Cell Evol Biol, 275, pp.1081~1101 (2003)
- Frost HM, "A brief review for orthopedic surgeons: fatigue damage (microdamage) in bone (its determinants and clinical implications)", J Orthop Sci, 3, pp.272~281 (1998)
- Sowden D, "AO self-drilling and self-tapping screws in rat calvarial bone: An ultrastructural study of the implant interface", J Oral Maxillofac Surg, 60, pp.294~299 (2002)
- Degidi M, "Histologic analysis of clinically retrieved immediately loaded titanium implants: a report of 11 cases", Clin Implant Dent Relat Res, 5, pp.89~93 (2003)
- Degidi M, "Periimplant bone in immediately loaded titanium implants: histologic and histomorphometric evaluation in human", A report of two cases. Clin Implant Dent Relat, 5, pp.170~175 (2003)
- Melsen B, "Biological reactions of alveolar bone to orthodontic loading of oral implants", Clin Oral Implants, 12, pp.144~152
- Oh NH, "Removal torque of sandblasted large grit and acid etched treated mini-implant", Korean J Orthod, 36, pp.324~330 (2006)
- Branemark R, "Biomechanical characterization of osseointegration during healing: an experimental in vivo study in the rat", Biomaterials, 18, pp.969~978 (1997)
- Lee JH, "Biomechanical and histomorphometric study on the bone-screw interface of bioactive ceramic-coated titanium screws", Biomaterials, 26, pp.3249~3257 (2005)
- Park HS, "Histologic and biomechanical characteristics of orthodontic self-drilling and self-tapping microscrew implants", Korean J Orthod, 36, pp.16~29 (2006)
- Chen YJ, "Removal torque of miniscrews used for orthodontic anchorage--a preliminary report", Int J Oral Maxillofac Implants, 21, pp.283~289 (2006)
- Simon H, "Removal torque of immediately loaded transitional endosseous implants in human subjects", Int J Oral Maxillofac Implants, 17, pp.839~845 (2002)
- Schulte W, "The Periotest method", Int Dent J, 42, pp.433~440 (1992)