Influence of late removal after treatment on the removal torque of microimplants
2
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
Objective: To compare the removal torque of microimplants upon post-use removal and post-retention removal and to assess the influencing factors. Methods: The sample group included 241 patients (age, 30.25 ± 12.2 years) with 568 microimplants. They were divided into the post-use (microimplants removed immediately after use or treatment) and post-retention (microimplants removed during the retention period) removal groups. The removal torque in both groups was assessed according to sex, age, placement site and method, and microimplant size. Pearson correlation and multiple linear regression analyses were performed for evaluating variables influencing the removal torque. Results: The mean period of total in-bone stay of microimplants in the post-retention removal group (1,237 days) was approximately two times longer than that in the post-use removal group (656.28 days). The removal torques in the post-retention removal group (range, 4–5 N cm) were also higher than those in the post-use removal group. The mandible and pre-drilling groups demonstrated higher placement and removal torques than did the maxilla and no-drilling groups, respectively. In the no-drilling post-use removal group, the placement torque and microimplant length positively correlated with the removal torque. In the post-retention removal group, unloading in-bone stay period and microimplant diameter positively correlated with the removal torque in the no-drilling and pre-drilling methods, respectively. Conclusions: The removal torques differed according to the orthodontic loading and removal time of microimplants. With prolonged retention of microimplants inserted using the no-drilling method, the removal torque was clinically acceptable and positively correlated with the unloading in-bone stay period.
Abstract
Objective: To compare the removal torque of microimplants upon post-use removal and post-retention removal and to assess the influencing factors. Methods: The sample group included 241 patients (age, 30.25 ± 12.2 years) with 568 microimplants. They were divided into the post-use (microimplants removed immediately after use or treatment) and post-retention (microimplants removed during the retention period) removal groups. The removal torque in both groups was assessed according to sex, age, placement site and method, and microimplant size. Pearson correlation and multiple linear regression analyses were performed for evaluating variables influencing the removal torque. Results: The mean period of total in-bone stay of microimplants in the post-retention removal group (1,237 days) was approximately two times longer than that in the post-use removal group (656.28 days). The removal torques in the post-retention removal group (range, 4–5 N cm) were also higher than those in the post-use removal group. The mandible and pre-drilling groups demonstrated higher placement and removal torques than did the maxilla and no-drilling groups, respectively. In the no-drilling post-use removal group, the placement torque and microimplant length positively correlated with the removal torque. In the post-retention removal group, unloading in-bone stay period and microimplant diameter positively correlated with the removal torque in the no-drilling and pre-drilling methods, respectively. Conclusions: The removal torques differed according to the orthodontic loading and removal time of microimplants. With prolonged retention of microimplants inserted using the no-drilling method, the removal torque was clinically acceptable and positively correlated with the unloading in-bone stay period.
참고문헌 (20)
- Huja SS, "Pull-out strength of monocortical screws placed in the maxillae and mandibles of dogs", Am J Orthod Dentofacial Orthop, 127, pp.307~313 (2005)
- Motoyoshi M, "Recommended placement torque when tightening an orthodontic mini-implant", Clin Oral Implants Res, 17, pp.109~114 (2006)
- Suzuki EY, "Placement and removal torque values of orthodontic miniscrew implants", Am J Orthod Dentofacial Orthop, 139, pp.669~678 (2011)
- Guler AU, "Resonance frequency analysis of 208 Straumann dental implants during the healing period", J Oral Implantol, 39, pp.161~167 (2013)
- Watanabe T, "Insertion torque and Periotest values are important factors predicting outcome after orthodontic miniscrew placement", Am J Orthod Dentofacial Orthop, 152, pp.483~488 (2017)
- Büchter A, "Load-related bone modelling at the interface of orthodontic microimplants", Clin Oral Implants Res, 17, pp.714~722 (2006)
- Motoyoshi M, "Factors affecting the long-term stability of orthodontic mini-implants", Am J Orthod Dentofacial Orthop, 137, pp.588~ (2010)
- 박효상, "Self drilling과 Self-tapping microscrew implants의 조직학적 및 생역학적인 비교", 대한치과교정학회지, 36(4), pp.295~307 (2006), 대한치과교정학회
- Ure DS, "Stability changes of miniscrew implants over time", Angle Orthod, 81, pp.994~1000 (2011)
- Park HS, "Microimplants as temporary orthodontic anchorage", pp.111~114 (2008), The University of Michigan
- Yadav S, "Microdamage of the cortical bone during mini-implant insertion with self-drilling and selftapping techniques : a randomized controlled trial", Am J Orthod Dentofacial Orthop, 141, pp.538~546 (2012)
- Roberts WE, "Orthodontics: current principles and techniques", pp.99~153 (2017), Elsevier
- Lakshmikantha HT, "3-Dimensional characterization of cortical bone microdamage following placement of orthodontic microimplants using Optical Coherence Tomography", Sci Rep, 9, pp.3242~ (2019)
- Park HS, "Density of the alveolar and basal bones of the maxilla and the mandible", Am J Orthod Dentofacial Orthop, 133, pp.30~37 (2008)
- Park HS, "Factors affecting the clinical success of screw implants used as orthodontic anchorage", Am J Orthod Dentofacial Orthop, 130, pp.18~25 (2006)
- Frost HM, "Bone's mechanostat : a 2003 update", Anat Rec A Discov Mol Cell Evol Biol, 275, pp.1081~1101 (2003)
- Degidi M, "Bone remodeling in immediately loaded and unloaded titanium dental implants : a histologic and histomorphometric study in humans", J Oral Implantol, 31, pp.18~24 (2005)
- Misch CE, "A bioengineered implant for a predetermined bone cellular response to loading forces. A literature review and case report", J Periodontol, 72, pp.1276~1286 (2001)
- Ozdemir F, "Cortical bone thickness of the alveolar process measured with cone-beam computed tomography in patients with different facial types", Am J Orthod Dentofacial Orthop, 143, pp.190~196 (2013)
- 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)