Akademik Veri Yönetim Sistemi
Nigerian Journal of Clinical Practice, cilt.29, sa.5, ss.520-527, 2026 (SCI-Expanded, Scopus)
Background: This study aimed to evaluate the effect of different cement types on the fracture strength of zirconia crowns fabricated at varying occlusal cement gap widths for primary molars using a computer-aided design and manufacturing (CAD/CAM) system under in vitro conditions. Methods: A total of 40 extracted mandibular primary second molars were prepared and randomly divided into four groups (n = 10 per group) in a 2 × 2 factorial designs based on cement type (glass ionomer vs. adhesive resin) and occlusal cement gap width (100 vs. 200 µm). Randomization was performed using a computer-generated random number sequence. After preparation, the teeth were embedded in acrylic blocks. The crowns were fabricated from zirconia blocks using a CAD/CAM system, with occlusal cement gap widths of 100 and 200 µm, and were then cemented using either glass ionomer cement or adhesive resin cement. All specimens were subjected to fracture testing at a crosshead speed of 10 mm/min, and the fracture load for each specimen was measured and recorded in Newtons (N). Data were statistically analyzed using the Shapiro–Wilk normality test and independent t-tests with Bonferroni correction for multiple comparisons. A significance level of P < 0.05 was used for all analyses. Results: The type of cement and the cement gap width had no statistically significant effect on the fracture strength of the zirconia crowns (P > 0.05). The highest mean fracture load was observed in the group with a 100 µm cement gap and adhesive resin cement (3847 ± 984.74 N). Conclusions: Zirconia crowns fabricated using CAD/CAM technology demonstrated fracture load values exceeding typical pediatric bite forces. Different cement types and gap widths yielded comparable fracture resistance, suggesting they may serve as alternatives in pediatric applications. However, in vitro findings should be validated by clinical studies before definitive clinical recommendations can be made.