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

BMC Oral Health

Research

Hyeonjong Lee¹  Yuwon Jeong²  Sangmyeong Tak³  Jee-Hwan Kim⁴  Jong-Eun Kim⁴ 

[1]Clinical Associate Professor, Department of Prosthodontics, Yonsei University College of Dentistry, 50-1, Yonsei-Ro, Seodaemun-Gu, 03722, Seoul, South Korea

[2]Doctoral Course Student, Department of Prosthodontics, College of Dentistry, Yonsei University, Seoul, South Korea

[3]Doctoral student, Department of Prosthodontics, School of Dentistry, Pusan National University, Yangsan, Republic of Korea

[4]Professor, Department of Prosthodontics, College of Dentistry, Yonsei University, Seoul, South Korea

关键词: Dental implant;    Implant-supported prosthesis;    Vector analysis;    Stress;    Occlusion;   

DOI  :  10.1186/s12903-023-03016-9

 received in 2023-02-21, accepted in 2023-05-04,  发布年份 2023

来源: Springer

【 摘 要 】

AimsTo 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.MethodsA 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).ResultsAngular 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.ConclusionsMechanical 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.

【 授权许可】

CC BY   
© The Author(s) 2023

【 图 表 】

40517_2023_258_Article_IEq114.gif

41116_2023_36_Article_IEq818.gif

41116_2023_36_Article_IEq816.gif

41116_2023_36_Article_IEq797.gif

41116_2023_36_Article_IEq744.gif

Fig. 2

41116_2023_36_Article_IEq702.gif

41116_2023_36_Article_IEq696.gif

41116_2023_36_Article_IEq692.gif

Fig. 2

41116_2023_36_Article_IEq639.gif