Comparison of the Internal Adaptation of Restorations Manufactured with Different Materi-als and Techniques

Purpose: This study aimed to evaluate and compare the internal adaptation of resto-rations produced with different materials and techniques. Material and Method: In the study, tooth 36 was prepared on a dental training mo-del (Kavo Basic study model, KavoGMBH, Germany) by an experienced prosthodontist. Using computer-aided manufacturing methods, 10 feldspathic ceramic crowns (Cerec Blocs, Sirona, Bensheim, Germany), monolithic zirconia crowns (Ceramill ZI CAM, Amann Girr-bach, Germany), zirconia frameworks (Aidite, Superfect Zir, USA), metal frameworks (Bego, Germany) by laser sintering, and metal frameworks (using conventional methods) were fab-ricated. The metal and zirconia frameworks were completed with superstructure ceramics (VITA, Germany) by an experienced technician. The restorations were placed on the prepa-red teeth, and a silicone replica of the cement gap was obtained using the replica technique with additive-type silicone impression material (Heraeus Kulzer, Germany). Sections obtai-ned from replicas were measured at 10 points using a light microscope. Statistical analysis of the data was performed using SPSS (ver. 21.0; SPSS, Inc., Chicago, IL, USA). ANOVA and post hoc Tukey HSD tests were applied to the obtained data. Results: A statistically significant difference was observed only between axio-occlusal measurement points (p<0.05). Conclusion: The internal range values were measured at a clinically acceptable range value of less than 200 micrometers. The highest internal range values were observed in the occlusal region and the lowest values in the axio-gingival region. The mean value of the hig-hest internal range was measured at the occlusal measurement point in the monolithic zir-conium group. The lowest mean value of internal range was measured at the axio-gingival measurement point in the zirconia-supported ceramic group.