Comparative Flexural strength of two types of monolithic zirconium oxide long-span fixed partial dentures

Abstract

Objectives:The purpose of this study was to evaluate the flexural strength of two types of monolithic zirconium oxide long-span fixed partial dentures (FPDs). The monolithic materials used in the study were (InCoris TZI C and Bruxzir shaded 16). Readily prepared ivory teeth were used to simulate a 4-unit FPD with 22 mm span length. A total number of 40 FPDs 4 units FBDs were distributed into two main groups based on the construction material type, each counting 20 FPDs. Twenty FPDs were fabricated using InCoris TZI C (group 1) and the other twenty FBDs were fabricated using Bruxzir shaded 16 (group 2). FPDs were manufactured according to CAD/CAM technique. All specimens were stored in water for 24 hours and then subjected to 10,000 thermal cycles then mechanically loaded for 10.000 preloading cycles at loads between minimum 10 N and maximum 89N at 1HZ frequency. and then loaded until failure in a universal testing machine. The 3-point bending test was done to evaluate the flexural strength of the FPDs using Instron testing machine. Results. Bruxzir shaded 16 has recorded the highest mean of values at a level of (928.55 Mpa± 66.13), while those recorded for InCoris TZI C group of specimens were at the level of (845.21 Mpa±83.54). T-test revealed a highly statistical significant difference between both tested monolithic zirconia materials at the value level of P<0.001.

Effect of Connector Designs on Flexural Strength of Gradient Versus Translucent Monolithic Zirconia Fixed Dental prosthesis, An in Vitro Study.

“…Although most papers choose specimens to test the flexural strength of connector design, in this study twenty 3-unit fixed dental prosthesis were constructed according to shakal et al 13 and Bahraini et al 20 Bigeneric copy mode was used for the construction of the fixed dental prosthesis to ensure standardization of the restorations.…”

“…The highest load that caused a bridge to collapse was measured in MPa. Flexural strength values were calculated from the following formula 13 :…”