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A comprehensive study on the mechanical effects of implant-supported prostheses under multi-directional loading and different occlusal contact points

 Sangmyeong Tak  ;  Yuwon Jeong  ;  Jong-Eun Kim  ;  Jee-Hwan Kim  ;  Hyeonjong Lee 
 BMC ORAL HEALTH, Vol.23(1) : 338, 2023-05 
Journal Title
Issue Date
Crowns OR Dental Implants* OR Dental Prosthesis, Implant-Supported OR Dental Restoration Failure OR Dental Stress Analysis / methods OR Humans
Dental implant ; Implant-supported prosthesis ; Occlusion ; Stress ; Vector analysis
AIMS: To evaluate screw loosening and fracture load and angular deviation of a single implant-supported prosthesis under multi-directional loading condition at three different occlusal contact points. METHODS: A total of 40 metal crowns were cemented to external connection implants and were embedded vertically and obliquely. The occlusal surface of the crown was designed with three flat surfaces, contact a, b, and c, representing outer and inner 20-degree inclination for buccal and lingual cusps. The angular deviations of implant crown under static 50N of loading were measured. And screw removal torque was evaluated before and after 57,600 load cycles. Then, fracture load was measured for each specimen. Data analysis was performed using one-way analysis of variance test of significance followed by Tukey honest significant difference (HSD) test(p < 0.05). RESULTS: Angular deviation results showed statistical significance between all contact points in vertically embedded group compared to obliquely embedded group, which showed similar results between contact A and B compared to C. In the other hand, screw loosening evaluation did not show statistical significance among the tested groups. And for the fracture load evaluation the maximum values reached twice the yield values in all contact areas. CONCLUSIONS: Mechanical effects were different regarding to diverse loading direction and contact points. The results of this study suggest that the stress concentration might increase in unfavorable vector direction. © 2023. The Author(s).
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2. College of Dentistry (치과대학) > Dept. of Prosthodontics (보철과학교실) > 1. Journal Papers
Yonsei Authors
Kim, Jong Eun(김종은) ORCID logo https://orcid.org/0000-0002-7834-2524
Kim, Jee Hwan(김지환) ORCID logo https://orcid.org/0000-0002-0872-4906
Lee, Hyeonjong(이현종) ORCID logo https://orcid.org/0000-0002-1669-2975
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