근심 레스트를 가진 지대치의 연결고정에 따른 응력분석

Abstract

The purpose of this study was to assess how the stress distribution affected to the non-splinted abutment and the splinted abutment with different alveolar bone level when the vertical load was applied to the mesial rest of the abutment using the three dimensional finite element analysis model. The results were as follows: 1. The more unfavorable the alveolar bone was, the greater the stress value in the periodontal ligament was. 2. As the vertical load was applied to the mesial rest of the abutment, the load was distributed to the adjacent tooth, tipping mesially the abutment. 3. As the vertical load applied to the mesial rest of the abutment with the unfavorable alveolar bone, the abutment was tipped much more lingually. 4. When the abutment was splinted with the adjacent tooth, the stress value showed lower to the abutment, higher to the adjacent tooth. 5. When the abutment with the unfavorable alveolar bone and the adjacent tooth with favorable alveolar bone were splinted, the stress value of the abutment showed lower than other groups. 6. When the abutment was splinted with the adjacent tooth, the load of the mesial rest was directed vertically, and the better the periodontal structure was, the better the stress distribution was. 7. The concentration of the stress was showed to the connection area of the splinted crowns. In conclusion, as the periodontal structure of the abutment is unfavorable, the proximal plate is necessary to extend lingually in order to prevent the lateral movement of the tooth, and it is expected to be better that the abutment is splinted to the adjacent tooth, and it is thought that the connection area of the splinted crowns is necessary to strengthen.