微创后牙贴面预备设计对疲劳后破坏载荷及模式的影响（体外研究）

Effect of minimally invasive posterior veneer Preparation designs on failure load and mode after fatigue (in-vitro study).

作者信息

Mohamed Mady Islam, Safwat El Kady Ahmed, Nabil Aboushelib Moustafa, Hussein A Hussein Mohamed

机构信息

Conservative Dentistry Department, Department of Conservative Dentistry Department, Faculty of Dentistry, Alexandria University, Champolion St., Azarita, Alexandria, 21527, Egypt.

Biomaterials Department Faculty, Faculty of Dentistry, Alexandria University, Alexandria, 21527, Egypt.

出版信息

BMC Oral Health. 2025 Jul 26;25(1):1241. doi: 10.1186/s12903-025-06457-6.

DOI:10.1186/s12903-025-06457-6

PMID:40713625

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC12297664/

Abstract

BACKGROUND

Ceramic veneers are a common option for enhancing dental aesthetics by improving tooth form, shade, and function. Preparation design is considered a critical factor in the success of dental veneers, as it influences the failure load and fatigue survival of posterior minimally invasive ceramic veneer restorations. The purpose of the study is to compare the failure load and mode after fatigue among three types of veneer preparation designs for restoring premolars.

METHODS

64 human premolars were equally divided into four groups. Group 1 had a buccal preparation depth of 0.7 mm; Group 2 had an additional reduction of the buccal cusp; Group 3 had a mesio-occluso-distal box with dimensions of 2 mm wide and 3 mm deep. The remaining sound teeth served as the control group. Monolithic lithium disilicate restorations were cemented onto the prepared teeth with adhesive cement and then exposed to dynamic fatigue and thermocycling. Each specimen underwent a single load-to-failure test, and the discrepancy in failure load before and after fatigue was computed.

RESULTS

No significant differences in initial failure load were observed among the four groups evaluated (p <.075). A significant drop in failure load was observed in all groups after fatigue (P = 0.012). The failure loads of Groups I and II were significantly lower than those of Group III and the control (P < 0.05)." Nevertheless, after fatigue, statistically significant differences were detected (p <.013) as fatigue caused a substantial drop in failure load among all groups.

CONCLUSIONS

Within the limitations of this study, fatigue significantly reduced failure load in all groups. Veneer preparation design influenced post-fatigue strength, with more conservative designs showing better resistance. These findings underscore the impact of fatigue on structural integrity and the importance of tooth preparation design on fatigue resilience.

摘要

背景

陶瓷贴面是通过改善牙齿形态、色泽和功能来提升牙齿美观度的常见选择。预备设计被认为是牙贴面成功的关键因素，因为它会影响后牙微创陶瓷贴面修复体的破坏载荷和疲劳寿命。本研究的目的是比较三种用于修复前磨牙的贴面预备设计的破坏载荷和疲劳后的破坏模式。

方法

64颗人前磨牙平均分为四组。第1组颊面预备深度为0.7毫米；第2组额外降低颊尖高度；第3组制备近中-咬合-远中箱形洞，宽2毫米，深3毫米。其余完好牙齿作为对照组。将整块二硅酸锂修复体用粘结剂粘结到预备好的牙齿上，然后进行动态疲劳和热循环处理。每个标本进行单次破坏载荷测试，并计算疲劳前后破坏载荷的差异。