Effect of inserted angle on the stability of loaded microscrews
10.3760/cma.j.issn.1002-0098.2017.01.008
- VernacularTitle: 不同植入角度对犬正畸支抗种植体稳定性的影响
- Author:
Pei SHAO
1
;
Zhenrui XU
2
;
Lixing ZHAO
3
;
Zhihe ZHAO
3
Author Information
1. State Key Laboratory of Oral Diseases, Sichuan University, Chengdu 610041, China (Present address: Department of Stomatology, 363 Hospital of China Aviation Industry, Chengdu 610041, China)
2. Department of Orthodontics, Jinqin International Dental Clinic-Shuangnan Branch, Chengdu 610041, China
3. State Key Laboratory of Oral Diseases, Sichuan University, Chengdu 610041, China
- Publication Type:Journal Article
- Keywords:
Biomechanics;
Osseointegration;
Orthodontic anchorage procedures;
Mini-screw
- From:
Chinese Journal of Stomatology
2017;52(1):39-43
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To evaluate the effect of different insertion angles on the osseointegration of loaded microscrews in beagle jaws.
Methods:Forty-eight microscrews were inserted at four different angles (30°, 50°, 70° and 90°) into the interradicular zones between the mandibular first molar and third premolar in twelve beagles and the microscrews had been loaded with a force of 2 N immediately for 8 weeks. After microscrew-bone specimens fixed, the maximum output value (Fmax) of pull-out test was recorded and the histomorphological changes of hard tissue were observed. The bone-implant contact (BIC%) was quantitatively analyzed and the osseointegration of microscrew-bone interface was comprehensively evaluated.
Results:Both Fmax and BIC% values of microscrews were influenced by the insertion angles. The maximum value of Fmax was (385±23) N in the group with 50° angle, and the minimum value was (198±16) N in the group with 30° angle(P <0.05). The maximum value of BIC% was (59.1±6.0)% in the group with 70° angle, and the minimum value was (30.2±3.2)% in the group with 30° angle (P <0.05). Histomorphology observation revealed that in peri-screws region, the various degree of bone remodeling was found in different angle samples.
Conclusions:The insertion angles (50°and 70°) were favorable to the stability of the microscrew.
