| Summary: | 碩士 === 高雄醫學大學 === 牙醫學研究所 === 98 === According to the research evidence, splinting prosthetic crowns had biomechanical advantages because occlusal force could be shared through splinted crowns. But there is no evidence to support that stress distributions on different implant inclinations with splinted crowns are the same as straight implants with splinted crowns. The purpose of this study was to analyze if different implant inclinations with splinted or non-splinted crowns affect stress distribution in the implants and the cortical bone around implants, and to investigate if the use of splinted crowns is biomechanically superior to the use of non-splinted crowns.
A 3-D model for finite element analysis was constructed containing different implant inclinations (0°, 15°, 30°) with splinted or non-splinted crowns in the posterior mandible. A simulated load (400N) was applied to the crowns with vertical and oblique forces. The data from simulated results were analyzed using the analysis of variance (ANOVA) test.
The results indicated that loading type, implant inclination, and splinting situation significantly (P<0.05) determined the magnitude of the stress values. But loading type was the major factor affecting stress values in the implants and the cortical bone around implants, followed by implant inclination, and splinting situation.
In conclusion, within the limitations of this 3-D finite element analysis, tilted implant (≦30°) with splinted or non-splinted crowns affect stress distribution in the cortical bone around implants, but the degree of influence is very small (0.09%). So, if the patient can’t maintain good oral hygiene, we suggest that the implant prosthetic crowns can be fabricated separately in order to avoid implant failure due to periodontal problems.
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