Three-dimensional finite element stress study of porcelain-fused-to-metal and telescopic splint for upper anterior tooth with fan-shaped shifting
10.3760/cma.j.issn.1002-0098.2012.s1.040
- VernacularTitle:金属烤瓷联冠和套筒冠修复扇形移位上前牙的三维有限元分析
- Author:
Feng-Lan LI
1
;
Lan MA
;
Jun PEI
;
Yi-Min ZHAO
Author Information
1. 山西省人民医院口腔修复科
- Keywords:
Finite element analysis;
Periodontal splints;
Alveolar bone loss
- From:
Chinese Journal of Stomatology
2012;47(z1):174-177
- CountryChina
- Language:Chinese
-
Abstract:
Objective To study the stress of fan-shaped shifting upper anterior teeth restored with porcelain-fused-to-metal(PFM) combined crown splint and telescopic splint using three-dimensional finite element method.Methods Model of splints was constructed by computer technology.Different loss of periodontal tissues was simulated,and von Mises stress was obtained.Results In all alveolar bone condition,under the vertical load,apex stress of the PFM group [(2.11 ± 0.60),(3.48 ± 0.29),(5.10±1.59),(7.03 ± 1.80) MPa] was higher than that of neck stress [(0.77 ± 0.11),(1.13 ± 0.13),(1.44 ± 0.34),(1.75 ± 0.10) MPa] (P ＜ 0.05) ; under the oblique loads,the result was reverse(P ＜ 0.05).Telescopic splint,under the vertical loads,in all alveolar bone condition,the neck stress was higher than that of apex stress (P ＜ 0.05) ; under the oblique loads,no alveolar bone absorption and alveolar bone absorption 1/3,neck stress was hinger than that of apex stress (P ＜ 0.05),and in alveolar bone absorption 1/2,2/3,the stress of neck and apex was equall.(P ＞ 0.05).Conclusions Different fixed splints should be selected in the clinical application according to different level of alveolar bone resorption.For the teeth with severe looseness and alveolar bone resorption,the restoration treatment effects of the telescopic denture splints are better than that of the PFM splints.
