Ahmed Mohammed Samiuddin, Reddy Kareti Mahendranadh, Shastry Y Mahadev, Aditya S Venkat, Babu P Jayakrishna
Department of Prosthodontics, Sri Sai College of Dental Surgery, Vikarabad, Telangana, India.
J Indian Prosthodont Soc. 2020 Jul-Sep;20(3):285-289. doi: 10.4103/jips.jips_68_20. Epub 2020 Jul 17.
The aim of this study is to evaluate the flexural strength of zirconia using three different connector designs under vertical and oblique loads.
Invitro - analytical study.
For simulating zirconia fixed partial prosthesis, a specimen with three octagonal cylinders connected with each other was designed. Each face of the octagon was 3.75 mm ± 0.1 mm, and the total width was 9 mm ± 0.1 mm with a standard connector area of 10 mm at cross-section. Three different connector designs, i.e., round, oval, and triangular were milled. Universal testing machine was used to test flexural strength with vertical and oblique forces.
Intergroup comparison of flexural strength was made using Descriptive statistics (1) one-way ANOVA, Bonferroni's test (2) Kruskal-Wallis test. The confidence interval was set at 95%, < 0.05 was considered statistically significant for both the tests.
The highest flexural strength was observed in the triangle connector with vertical forces and lowest with oblique forces.
Triangle connector design proved to be better than round and oval connectors on the application of vertical loads. Round connector design proved to be better than triangle and oval connector on application of oblique loads.
本研究旨在评估氧化锆在垂直和斜向载荷下使用三种不同连接体设计时的抗弯强度。
体外分析研究。
为模拟氧化锆固定局部义齿，设计了一个由三个八角形圆柱体相互连接的试件。八边形的每个面为3.75毫米±0.1毫米，总宽度为9毫米±0.1毫米，横截面标准连接体面积为10毫米。铣削出三种不同的连接体设计，即圆形、椭圆形和三角形。使用万能试验机测试垂直和斜向力作用下的抗弯强度。
采用描述性统计（1）单因素方差分析、邦费罗尼检验（2）克鲁斯卡尔 - 沃利斯检验进行抗弯强度的组间比较。置信区间设定为95%，两种检验中P<0.05被认为具有统计学意义。
垂直力作用下三角形连接体的抗弯强度最高，斜向力作用下最低。
在垂直载荷应用中，三角形连接体设计被证明优于圆形和椭圆形连接体。在斜向载荷应用中，圆形连接体设计被证明优于三角形和椭圆形连接体。
