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DO MANUFACTURING TECHNIQUES AND MATERIALS AFFECT INTERNAL FIT?
Purpose: This study aims to evaluate and compare the internal compliance of restorations produced with different materials and techniques. Materials and methods: Tooth 36 was prepared by an experienced prosthodontist on the dentistry preparation training model (KavoBasicstudymodel, KavoGMBH, Germany). 10 feldspathic ceramics (CerecBlocs, Sirona, Germany), 10 monolithic zirconia (CeramillZICAM, AmannGirrbach, Germany), 10 Zirconia supported ceramics (Aidite, SuperfectZir, USA) using IMES550I device with digital workflow , 10 metal substructures obtained by laser sintering method and also 10 metal supported ceramic crowns were obtained by conventional method. The restorations were placed on the prepared tooth and the internal gap was determined using the replica technique with the addition type silicone impression material. Sections were taken from the obtained silicon layer and the amount of internal spacing was measured from 10 different points to be examined under a light microscope with 1X magnification. Statistical analysis of the obtained data was performed using SPSS (ver.21.0; SPSS, Inc., Chicago, IL, USA) package program. Results: It was observed that there was a statistically significant difference between the measurements of 5 different groups of restorations produced with different materials and techniques from the determined points, only between the axioocclusal measurement points. (p<0.05). Conclusions: The internal gap values of all samples produced with digital and conventional measurement methods were measured less than 200 micrometers and were measured at the clinically acceptable range value. The internal gap values of all samples were observed the highest in the occlusal region, while the lowest was observed in the axiogingival region. A statistically significant difference was observed only between the measured axioocclusal measurement points. The highest internal gap mean value was measured at the occlusal measurement point in the monolithic zirconia group. The lowest internal gap mean value was measured at the axiogingival measurement point in the zirconia supported ceramic group.