Abstract
The goal is to compare the strength of a fracture among titanium, fiber and zirconium posts. We have formed three group: titanium, fiber and zirconium,, and each group has 20 samples with 3 different diameters.
 The posts were tested using "Shimadzu Univerzal Testing Mashine" at the same distance, and the force was applied to all at the same place. The fracture strength was registered on a special software system.
 Between posts with the same diameter (1.2 mm) the greatest average fracture force has titanium posts 161.69 N (± 0.07), followed by fiber posts 45.38N (± 0, 01) and zirconium posts 34.81N (± 0.01). between the subgroups of the same diameter (1.35mm), the greatest average fracture strength has the titanium posts 165.26N (± 0.01), followed by the fiber posts 71.57N (± 0.01) and zirconium posts 46.53N (± 0.004). between the subgroups of the same diameter (1.5 mm) the largest average fracture force has titanium posts 202.42N (± 0.01), followed by fiber posts 73.67N (± 0.004) and zirconium posts 67.15N (± 0.004).
 The diameter of the different types of posts gives different mechanical properties that affect differently the resistance of the fracture strength.
Highlights
The need for better aesthetics and biocompatibility of restoration contributed to finding translucent non metallic upgrading systems and their improvement. [1] Prefabricated fiber and zirconium upgrading systems have been examined to meet the aesthetic needs of endodontically treated teeth
Using the t-test for two independent samples, a statistically significant difference was found between the force of a fracture in subgroups with titanium and fiber posts for t = 5131.390N; df = 18 and p = 0.000; statistically significant difference between the force of the fracture in the subgroups of titanium and zirconium posts for t = 5590.716N; df = 18 and p = 0,000 and a statistically significant difference between the force of the fracture in subgroups with fiber and zirconium posts for t = 4149,443N; df = 18 and p = 0.000
Using the t-test for two independent samples, a statistically significant difference was found between the force of a fracture in subgroup s with titanium and fiber posts for t = 5131.390N; df = 18 and p = 0.000; statistically significant difference between the force of the fracture in the subgroups of titanium and zirconium posts for t = 5590.716N; df = 18 and p = 0,000 and a statistically significant difference between the force of the fracture in subgroups with fiber and zirconium posts for t = 4149,443N; df = 18 and p = 0.000
Summary
The need for better aesthetics and biocompatibility of restoration contributed to finding translucent non metallic upgrading systems and their improvement. [1] Prefabricated fiber and zirconium upgrading systems have been examined to meet the aesthetic needs of endodontically treated teeth. To make comparisons: 1)between different posts with the same diameter 2)What is the diameter affection - whether there is a significant difference between the groups and in which groups Materials and Methods To accomplish the given goals of the experimental study we use different types of posts: titanium, fiber and zirconium.
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