Int J Prosthodont. 2020 May/Jun;33(3):307-314. doi: 10.11607/ijp.6669.
To analyze the impact of different veneering techniques on the fracture load of telescopic secondary crowns made of a high-performance polymer (Ultaire aryl ketone polymer [UAKP]).
Zirconia primary crown models (taper of 0 degrees) were prepared (N = 48), polished, scanned, and divided into four veneering groups (n = 12 each): premanufactured, digital, full anatomical, and vestibular. For all groups except vestibular, a standardized telescopic secondary crown (thickness: 0.6 mm, circular margin: 1 mm) was constructed, adapted to the corresponding primary crown, milled from UAKP, and veneered. The veneered master crown was developed based on the premanufactured group. After surface polishing, all specimens were artificially aged in a chewing simulator (1.2 million cycles, 50 N, 1.1 Hz, between 5°C and 55°C). Fracture load was tested in a universal testing machine with a piston (Ø = 6 mm, 1 mm/minute). Fracture patterns were analyzed. For statistical analysis, Kolmogorov-Smirnov test and descriptive statistics followed by one-way ANOVA with post hoc Scheffé test were conducted (P < .05).
Significant differences in fracture load were found between different veneering techniques (P < .001), with the highest values for the vestibular and digital groups, followed by the premanufactured group. Full anatomical veneering showed the significantly lowest fracture load (1,885 ± 397 N). For all specimens, cohesive brittle fractures with similar fracture patterns occurred, irrespective of the veneering technique.
The veneering technique of telescopic secondary crowns made of high-performance polymer affects overall stability. All veneering techniques provided sufficient fracture load values for telescopic secondary crowns made of UAKP. Digital veneers seem the most recommendable.
分析不同贴面技术对高性能聚合物（Ultaire 芳基酮聚合物[UAKP]）制成的伸缩式二次冠的断裂负荷的影响。
制备氧化锆基牙冠模型（锥度为 0 度）（N = 48），抛光，扫描，并分为四个贴面组（每组 n = 12）：预制、数字、全解剖和颊面。除颊面组外，所有组均构建了标准化的伸缩式二次冠（厚度：0.6 毫米，圆形边缘：1 毫米），适配相应的基牙，由 UAKP 铣削而成，并进行贴面。贴面母冠是基于预制组开发的。表面抛光后，所有样本均在咀嚼模拟器中进行人工老化（120 万次循环，50 N，1.1 Hz，5°C 至 55°C 之间）。在万能试验机上用活塞（Ø = 6 毫米，1 毫米/分钟）测试断裂负荷。分析断裂模式。统计分析采用 Kolmogorov-Smirnov 检验和描述性统计，然后进行单向方差分析，并用事后 Scheffé 检验（P <.05）。
不同贴面技术的断裂负荷存在显著差异（P <.001），颊面组和数字组的数值最高，其次是预制组。全解剖贴面的断裂负荷明显最低（1885 ± 397 N）。所有样本的断裂模式相似，均发生脆性整体断裂，与贴面技术无关。
高性能聚合物制成的伸缩式二次冠的贴面技术会影响整体稳定性。所有贴面技术均为 UAKP 制成的伸缩式二次冠提供了足够的断裂负荷值。数字贴面似乎最值得推荐。
