Influence of Thermo-mechanical Aging on Straight versus Angled Multi-Unit Abutments Screw Joint Stability | ||||
| Egyptian Dental Journal | ||||
| Article 5, Volume 69, Issue 1 - Serial Number 4, January 2023, Page 487-495 PDF (796.38 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/edj.2022.167394.2286 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
Aya Salama   1; Mohamed Radwan 2; Sherif Bushra 1
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| 1Lecturer, Fixed Prosthodontics Department, Faculty of Dentistry, MSA University, Egypt. | ||||
| 2Lecturer, Fixed Prosthodontics Department, Faculty of Dentistry, Beni Suef University, Egypt. | ||||
| Abstract | ||||
| Purpose: Evaluate the screw joint stability of the straight versus angled Multi-Unit (MU) abutment following dynamic cyclic loading and thermo-cycling aging. Methods: This study compared abutment screws reverse torque values (RTVs) using three different angles (0°, 17°, and 30°) after cyclic loading and thermocycling. The samples comprised 21 full crowns supported by internal hex implant fixtures and multi-unit abutments divided into three groups (A, B & C), representing abutment different angulations. For data analyses, the significance level was set at p> 0.05 (CI 95%). Results: Paired t-test showed that the mean RTV was significantly lower following aging for each angle (P-value = 0.000). The three angulation groups' abutment screw RTVs differed significantly, with the lowest RTV detected at the 17-degree angulation MU Abutment. Conclusions: The performance of angled abutments in regards to removal torque values were less than that of straight abutments, yet, have generally been satisfactory. Dynamic cyclic loading and thermocycling had a significant effect on RTV of implant abutments. | ||||
| Keywords | ||||
| Screw loosening; Multi-unit abutment; Joint stability; All-on-Four; Angled Abutment | ||||
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