Influence of Fabrication Settings on the In Vitro Performance of Subtractively Manufactured Resin-Based Molar Crowns.

Martin Rosentritt, Laura Haas, Angelika Rauch, Michael Schmid
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Abstract

Purpose: To investigate the influence of milling parameters on the durability and fracture force of resinbased composite crowns during in vitro aging simulation.

Materials and methods: Identical molar crowns (n = 8 per group) were milled from resin-based composite crowns (Grandio, VOCO Dental) with different processing speeds (soft, normal, fast) or levels of detail (very high, high, low) from 98-mm disks. One group was milled wet to investigate the influence of cooling. The influence of polishing was tested in two groups. All crowns were adhesively bonded on standardized resin-based composite molars. Aging was performed with thermal cycling and mechanical loading (2 × 3,000 × 5°C/55°C, 2 minutes, H20 dist., 1.2 × 106 force at 50 N). Fracture forces were determined (v = 1 mm/minute, Z010, Zwick Roell).

Results: For statistical analysis, Pearson correlation, one-way ANOVA, and Bonferroni post hoc tests were used (α = .05). All crowns survived thermal cycling and mechanical loading (TCML) without any failures. The fracture values varied between 1,237.3 ± 326.7 N and 3,308.6 ± 655.8 N. Significant (P < .001) differences between the individual manufacturing approaches were detected. Failure was categorized as a fracture of the crown and partial loosening of the crown. No different failure pattern was observed between the tested systems.

Conclusions: A medium level of detail seems to be ideal to achieve the highest fracture forces. No relationship existed between machine speed and fracture force. Fracture force was not affected by wet grinding. In individual cases, polishing reduced crown fracture values due to reduced wall thickness.

制备设置对减法制备树脂基磨牙冠体外性能的影响。
目的:研究铣削参数对树脂基复合冠体外模拟老化耐久性和断裂力的影响。材料和方法:用树脂基复合牙冠(Grandio, VOCO, Germany)以不同的加工速度(软、普通、快速)或细节水平(非常高、高、低)从98mm圆盘上铣制相同的磨牙冠(每组n=8)。为了研究冷却的影响,一组被磨湿。在两组中测试抛光的影响。所有冠均粘接在标准树脂基复合磨牙上。通过热循环和机械加载(2x3000x5°C/55°C, 2min, H20距离,1.2x106力50N)进行老化。测定断裂力(v=1mm/min, Z010, Zwick,德国)。统计学:人相关、单因素方差分析、Bonferroni事后检验(α=0.05)。结果:所有冠体均存活,无损伤。断裂值在1237.3±326.7N ~ 3308.6±655.8N之间变化。结论:中等水平的细节似乎是获得最高骨折力的理想选择。加工速度与断裂力之间不存在相关关系。湿式磨削对断裂力没有影响。在个别情况下,由于壁厚减少,抛光降低了冠断裂值。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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