| Autor: |
Ibrahim, Eman Assem, Khamis, Mohamed Moataz, Ezzelarab, Salah, Abdelhamid, Ahmed M. |
| Předmět: |
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| Zdroj: |
BMC Oral Health; 7/7/2023, Vol. 23 Issue 1, p1-8, 8p |
| Abstrakt: |
Background: The aim of this study was to assess the impact of abutments with angled screw access channel on the retention of zirconia crowns. Methods: Seven implant replicas were inserted in epoxy resin blocks. Fourteen zirconia crowns for central incisor tooth were digitally fabricated and cemented to titanium bases (Ti-bases) with resin cement. Titanium bases were categorized into 2 groups (n = 7). Control group (Group STA) included straight screw access channel abutments. Study group (Group ASC) included angled screw access channel abutments. Following aging (5 °C-55 °C, 60 s; 250,000 cycles, 100 N, 1.67 Hz), the pull-off forces (N) were recorded by using retention test (1 mm/min). Types of failure were defined as (Type 1; Adhesive failure when luting agent predominantly remained on the Ti-base surface (> 90%); Type 2; Cohesive failure when luting agent remained on both Ti-base and crown surfaces; and Type 3; Adhesive failure when luting agent predominantly remained on the crown (> 90%). Statistical analysis was conducted by using (IBM SPSS version 28). Normality was checked by using Shapiro Wilk test and Q-Q plots. Independent t-test was then used to analogize the groups. Results: Mean ± standard deviation of retention force records ranged from 1731.57 (63.68) N (group STA) to 1032.29 (89.82) N (group ASC), and there was a statistically significant variation between the 2 groups (P <.05). Failure modes were Type 2 for group STA and Type 3 for group ASC. Conclusions: The retention of zirconia crowns to abutments with a straight screw access channel is significantly higher than abutments with angled screw access channel. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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