The aim of this study was to evaluate the relationship between Endodontic Access Cavity (EAC) types with MB2 canal detection ratio in the upper first molars. A total of 60 roots of extracted human maxillary first molars were selected. All teeth were prepared with Point EAC (PEAC), Conservative EAC (CEAC) and Traditional EAC (TEAC) respectively. After each group were completed, extra canal was searched. Preoperative and postoperative tooth weigh was calculated using precise scale. McNemar’s chi-square test and a paired test significant difference were used for statistical analyses. The EAC types statistically were changed of tooth tissue loss quantity (p = 0.000). MB2 detection rate of CEAC (%53,3) and TEAC (%60) are higher than statistically that of PEAC (%31.6) (p < 0.05). 8 teeth MB2 canal was detected only with the CBCT images. In upper molars, CEAC seems reasonable in terms of detected the MB2 canal and removed hard tissue.

Özkardeş MH, et al. J Adv Prosthodont. 2025 Jun;17(3):158-168. https://doi.org/10.4047/jap.2025.17.3.158

Objective: With the widespread use of CAD/CAM (computer aided design and manufacture) systems in dentistry, many restorative materials have been produced. In our study, we aimed to evaluate the change in optical properties of newly developed translucent monolithic zirconia (TMZ) (Cercon HT Dentsply, Sirona, USA), zirconia-reinforced lithium silicate (ZLS) (Celtra Duo, Dentsply, Germany) and lithium disilicate (LS2) (IPS e.max CAD, Ivoclar Vivadent, Liechtenstein) materials with aging. Methods:10 discs of 12mm diameter and 1.2 mm thickness were produced from high translucent A2 color of each material. The aging process was applied in an autoclave under 134ºC, 0.2MPa pressure. For optical evaluation, L*, a*, b* values of the samples were measured by spectrophotometry before aging, after 3 hours and 6 hours aging. ΔE00 values and translucency parameters (TP) were calculated. The data were evaluated statistically. Results: In the present study, all the materials had undergone color change as a result of aging, but this change was within acceptable limits (ΔE00 0.8). There was a decrease in the translucency of all materials used in the study, but this decrease was not statistically significant. Conclusion: In the light of the findings obtained from this in vitro study, aging did not cause color and translucency changes in TMZ, ZLS, LS2 monolithic CAD/CAM materials.

This study aimed to compare the translucency values of anterior crowns fabricated with ultra-high-translucent (UHT) zirconia, low-translucent (LT) lithium disilicate (LDS), and LT zirconia-reinforced lithium silicate (ZLS) glass-ceramics. In total, 48 central incisor crowns (n = 12) were fabricated from IPS e.max CAD LT (IPS), Celtra Duo LT (CD), and GC Initial UHT zirconia (GC, GC1). A standard of 1.5 mm labial thickness of the crowns was determined for three groups (IPS, CD, GC), and 1 mm labial thickness was determined for GC1. The crowns’ translucency values were assessed in terms of the contrast ratio (CR). One-way ANOVA and Tamhane tests were used for analyzing the data. The mean CRs of GC1, GC, IPS, and CD specimens were 0.13 ± 0.01, 0.22 ± 0.01, 0.22 ± 0.04, and 0.29 ± 0.04, respectively. The CD group had significantly higher CR values than the other groups. The difference between the CR values of GC and IPS groups was not statistically significant. The GC1 group’s CR was significantly lower than the GC group. It is critical to select monolithic materials in order to achieve esthetic restorations, particularly for anterior teeth. The translucency of monolithic restorative materials was influenced by the type and the thickness of the material used.