Effect of Insertion Angle on Stability of Loaded Titanium Microscrews

doi:10.13701/j.cnki.kqyxyj.2019.02.017

Abstract

Abstract: Objective : To evaluate the effect of insertion angle on stability of loaded titanium microscrews in beagle jaws. Methods: 48 microscrews were inserted at four different angles (30°,50°, 70°, and 90°) into intraradicular zones of the mandibular first molars and third premolars of 12 beagles and immediately loaded with 2 N for 8 weeks. Microcomputed tomography (micro-CT) and biomechanical pull-out tests were used to assess osseointegration of the interface. Results: All micro-CT parameters and maximum pull-out force (F_max) of the microscrews were affected by insertion angles of microscrews. Higher micro-CT parameters and F_max were seen for implants inserted at angles between 50°and 70°(P＜0.05). Excessive oblique and vertical insertion angles resulted in reduced stability (P＜0.05). Conclusion: An insertion angle of 50°to 70°is more favorable than excessive oblique or vertical angles to achieve stability of microscrews.

Key words: Insertion angle, Osseointegration, Microscrews, Microcomputed tomography, Biomechanics

WU Ye-ke,ZHAO Li-xing,GAO Ran-ran.. Effect of Insertion Angle on Stability of Loaded Titanium Microscrews[J]. Journal of Oral Science Research, 2019, 35(2): 172-175.

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