교정용 미니스크류의 형상에 따른 식립 토오크의 비교
Comparison of insertion torque regarding changes in shape, diameter, and length of orthodontic miniscrews
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초록
교정용 스크류의 적절한 식립 토오크는 스크류와 골과의 경계에 적절히 작용하여 실패를 최소화 할 수 있는데, 너무 낮은 식립 토오크는 안정성이 없으며 반면에 너무 강한 식립 토오크는 열, 기계적 손상으로 골 괴사를 야기할 수도 있다. 본 연구에는 임상적으로 스크류의 길이와 직경 및 형태 등을 달리하여 식립 토오크를 측정해서 스크류의 각 부분에 대한 세분화된 토오크의 변화를 분석하고자 하였다. 연구결과 1.5 mm 두께의 인공피질골 블록에서 cylindrical type 스크류와 taper type 스크류 두 형태 모두에서 스크류 길이가 길수록 최대 식립 토오크 값도 함께 증가하였다. 특히 cylindrical type 스크류에서 길이에 따른 토오크 변화에 대해 통계적으로 유의한 차이가 관찰되었다 (p < 0.05). 미니스크류의 연속적인 식립 토오크 분석 결과 cylindrical type 스크류는 연속적인 그래프 형태를 보이면서 불완전 나사부에서 식립 토오크가 크게 증가하였으며, taper type 스크류는 나사선의 마지막 경사진 부분에서 식립 토오크가 크게 증가하였다. 외경이 커질수록 최대 식립 토오크 값은 증가하였는데, 통계적으로 유의한 차이를 보였다 (p < 0.05). 형태와 외경, 길이는 모두 토오크 값에 유의한 영향을 미치는데, 식립 토오크에 가장 큰 영향을 미치는 것은 외경, 형태, 길이 순서였다. 본 연구 결과 스크류의 식립 토오크에 가장 큰 영향을 미치는 것은 스크류의 외경이며 각각의 해부학적 구조물에 대한 피질골의 두께를 고려하여 적합한 스크류의 두께 및 나사산의 형태를 선택하는 것이 스크류의 초기 고정력을 얻는데 유리하다고 판단된다. (대치교정지 2007;37(2):89-97) 주요 단어: 미니스크류, 식립 토오크, 외경, 길이
Abstract
Objective: The purpose of this study was to measure the insertion torque of orthodontic miniscrews regarding changes in their shape, diameter, and length. Methods: Torque values were measured during continuous insertion of the miniscrews into solid rigid polyurethane foam, using a torque tester of driving motor type with a regular speed of 3 rpm. Orthodontic miniscrews (Biomaterials Korea, Seoul, Korea) of cylindrical type and taper type were used. Results: Increasing the length and diameter of the miniscrews increased the maximum insertion torque value in both cylindrical and taper type screws. Insertion torque was increased at the incomplete head of the cylindrical type screw, and at the tapered part of the taper type screw. The insertion torque value of miniscrews was influenced most by diameter, then shape and length. As a result, it was shown that the diameter of the screw had the most influence on insertion torque, and the taper type screw had a higher torque value than the cylindrical type screw. Conclusion: Therefore, a large diameter or taper type screw are adequate for areas of thin cortical bone with a large interdental space, and a small diameter or cylindrical type screw are adequate in the mandibular molar area or the midpalatal area having thick cortical bone. (Korean J Orthod 2007;37(2):89-97)
참고문헌 (30)
- "The use of palatal implants for orthodontic anchorage: Design and clinical application of the orthosystem", 7, pp.410~416 (1996)
- "Zygoma ligatures: an alternative form of maxillary anchorage", 32, pp.154~158 (1998)
- "Skeletal anchorage system for open-bite correction", 115, pp.166~174 (1999)
- "Mini-implant for orthodontic anchorage", 31, pp.763~767 (1997)
- "Miniscrews as orthodontic anchorage: a preliminary report", 13, pp.201~209 (1998)
- "A clinical study on intraoral anchorage using titanium miniscrew", 39, pp.684~687 (2001)
- "A clinical and histological evaluation of titanium mini-implants as anchors for orthodontic intrusion in the beagle dog", 119, pp.489~497 (2001)
- "Mechanical performance of standard and cannulated 4.0-mm cancellous bone screws", 18, pp.307~312 (2000)
- "Basic biomechanics of the musculoskeletal system", pp.390~399 (2001), Lippincott Williams & Wilkins, Philadelphia
- "The use of small titanium screws for orthodontic anchorage", 82, pp.377~381 (2003)
- "Load-related implant reaction of mini-implants used for orthodontic anchorage", 16, pp.473~479 (2005)
- "Factors associated with the stability of titanium screws placed in the posterior region for orthodontic anchorage", 124, pp.373~378 (2003)
- "The effect of cutting flute design on bone screw insertion and pull-out properties, In 46th Annual Meeting of the Orthopaedic Research Society, poster session, poster 0875", pp.12~15 (2000)
- "Biomechanical analysis of bone mineral density, insertion technique, screw torque and holding strength of anterior cervical plate screws", 83, pp.325~329 (1995)
- "Loosening of sacral screw fixation under in vitro fatigue loading", 18, pp.808~814 (2000)
- "Effects of hole preparation on screw pullout resistance and insertional torque: a biomechanical study", 94, pp.91~96 (2001)
- "Can insertional torque predict screw loosening and related failures? An in vivo study of pedicle screw fixation augmenting posterior lumbar interbody fusion", 25, pp.858~864 (2000)
- "Direct implant loading in the edentulous maxilla using a bone density-adapted surgical protocol and primary implant stability criteria for inclusion", 1, pp.60~69 (2005)
- "Comparative analysis of deformation of two implant", abutment connection systems during implant insertion, 2005, pp.54, 129~138
- "A comparison of two methods of enhancing implant primary stability", 6, pp.48~57 (2004)
- "Influence of implant taper on the primary and secondary stability of osseointegrated titanium implants", 15, pp.474~480 (2004)
- "Bone mineral density measurement with dental quantitative CT prior to dental implant placement in cadaver mandibles: pilot study", 224, pp.247~252 (2002)
- "Bone's mechanostat: a 2003 update", 275, pp.1081~1101 (2003)
- "Mechanical evaluation of a soft tissue interference screw with a small diameter: significance of graft", bone tunnel cross-sectional area ratio, 2006, pp.14, 330~334
- "Pullout strength of self-tapping screws inserted to different depths", 19, pp.462~465 (2005)
- "Mechanical properties of trabecular bone in the human mandible: implications for dental implant treatment planning and surgical placement", 57, pp.700~706 (1999)
- "Mechanical analysis of the taper shape and length of orthodontic mini-implant for initial stability", 36, pp.55~62 (2006)
- "Three dimensional finite element method for stress distribution on the length and diameter of orthodontic miniscrew and cortical bone thickness", 33, pp.11~20 (2003)
- "Contact non-linear finite element model analysis of immediately-loaded orthodontic mini implant" (2004)
- "Relationship between insertion torque and removal torque analyzed in fresh temporal bone Comparison of insertion torque regarding changes in shape and length of orthodontic miniscrewsSeon-A Lim The purpose of this study was to measure the insertion torque of orthodontic miniscrews regarding changes in their shape Torque values were measured during continuous insertion of th", pp.442~7 (1991)