The effect of diameter of the screw-access hole on the implant prosthodontic system and surrounding cortical bone-A 3D finite element analysis
10.3969/j.issn.1001-3733.2018.02.008
- VernacularTitle:牙合面开孔直径对种植修复系统及周围皮质骨影响的有限元分析
- Author:
Zhe LI
1
;
Bowen QIN
;
Xiaofeng CHANG
;
Zhaoli MENG
;
Feng PAN
;
Miao WANG
;
Liangzhi DU
Author Information
1. 陕西省颅颌面精准医学研究重点实验室
- Keywords:
Screw-access hole;
Cement-retaintion;
Implant prosthodontic system;
Finite element analysis (FEA);
Maximum equivalent stress
- From:
Journal of Practical Stomatology
2018;34(2):182-187
- CountryChina
- Language:Chinese
-
Abstract:
Objective: To investigate the stress and stress distribution generated on each component of implant prosthodontic system and surrounding cortical bone when different diameters of screw-access hole (SAH) were prepared on molar crown. Methods: A fimite element(FE) model of partial mandible without first molar was set up, and an Bego implant was insert into it. A total of 5 models of the crown were computer-simulated by varying the diameter (Φ = 0-4 mm) of the SAH. The loading forces were 200 N axially (0°) and 100 N obliquely (45°) respectively on occlusive surface. The FE analysis was performed by computer. Results: Φ ≤3 mm: stress on occlusal surface of crown was almost unchanged and mainly distributed in the loading area. Φ = 4 mm, stress appeared an obvious rise and reached the maximum, the stress concentration under vertical load was changed to the hole margin. In vertical loading, screw could remain at a relatively low stress level when diameter did not exceed 1 mm. No changes on other components was observed. Conclusion: SAH diameter of 1 mm is recommended when a cement-and screw-retained crown is used in posterior region.
