Biomechanical stress and microgap analysis of bone-level and tissue-level implant abutment structure according to the five different directions of occlusal loads
김재훈, 노건우, 홍성진, 이현종,
소속 상세정보
김재훈 ( Kim Jae-Hoon ) - Pusan National University School of Dentistry Department of Dental Education
노건우 ( Noh Gun-Woo ) - Kyungpook National University School of Mechanical Engineering
홍성진 ( Hong Seoung-Jin ) - Kyung Hee University Dental Hospital Department of Prosthodontics
이현종 ( Lee Hyun-Jong ) - Pusan National University School of Dentistry Department of Prosthodontics
Abstract
PURPOSE: The stress distribution and microgap formation on an implant abutment structure was evaluated to determine the relationship between the direction of the load and the stress value.
MATERIALS AND METHODS: Two types of three-dimensional models for the mandibular first molar were designed: bone-level implant and tissue-level implant. Each group consisted of an implant, surrounding bone, abutment, screw, and crown. Static finite element analysis was simulated through 200 N of occlusal load and preload at five different load directions: 0, 15, 30, 45, and 60°. The von Mises stress of the abutment and implant was evaluated. Microgap formation on the implant-abutment interface was also analyzed.
RESULTS: The stress values in the implant were as follows: 525, 322, 561, 778, and 1150 MPa in a bone level implant, and 254, 182, 259, 364, and 436 MPa in a tissue level implant at a load direction of 0, 15, 30, 45, and 60°, respectively. For microgap formation between the implant and abutment interface, three to seven-micron gaps were observed in the bone level implant under a load at 45 and 60°. In contrast, a three-micron gap was observed in the tissue level implant under a load at only 60°.
CONCLUSION: The mean stress of bone-level implant showed 2.2 times higher than that of tissue-level implant. When considering the loading point of occlusal surface and the direction of load, higher stress was noted when the vector was from the center of rotation in the implant prostheses.
키워드
Finite element analysis; Torque; Dental stress analysis; Dental implant-abutment design; Weight-bearing
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