Fatigue cyclic and static load tests of pressable ceramic fused to metal custom implant abutment with different metal height
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The purpose of this study is to evaluate the mechanical properties of pressed ceramic to metal implant abutments under cyclic and static loading with three different metal substructures. An average dimension central incisor was selected with mesial-distal width of 9mm, and length of 10mm. Press on metal ceramic (IPS InLine PoM ® press) was selected for the abutment pressable ceramic, Lodestar ® for the metal substructure of the custom implant abutments. IPS e-max ® press was selected for the crowns that comprised the test specimens and the crowns were bonded to the pressable ceramic abutments with Multilink ® auto mix luting cement. The test groups consisted of fourteen samples, which were divided into two groups with metal substructure heights of 6mm and 4mm. The control group in this study was seven metal ceramic abutments with full length of metal substructure of 8mm. All specimens were subjected to thermo-cycling of 2000 cycles before the fatigue test. Each cycle consisted of five seconds dwell time in two baths of 5°C and 55°C, with transport time of 15 seconds each between the baths. The crown-abutment test specimens were fixed to titanium implant analogues and placed in a test stand at a 30° angle in a cyclic load testing machine with an axial load of 100 N at a crosshead speed of 0.1 mm/second for 500,000 cycles with a soft tip indentor. One test specimen that was damaged during preparation for testing was excluded from the test sample. There was no damage to the remaining 20 specimens under the cyclic load, and they were subsequently subjected to static load to failure with a soft tip indentor. The mean (SD) static to load failure for the 8mm control group was 1691.83N (419.35N). The mean load to failure for the 6mm group was 1579.28 N (586.29N). The mean load to failure for the 4mm group was 1971.14N (451.90N). Analysis of variance (ANOVA) demonstrated no statistical difference in load to failure between pressable ceramic fused to metal abutment with different metal support heights. According to the findings of the study, a metal ceramic abutment with 4 or 6 mm metal substructure height could be used successfully even in heavy functional clinical situations. The load to failure was significantly higher than the parafunctional threshold of the human bite force.