TY - JOUR ID - 48409 TI - Influence of Sintering Temperature on the Marginal Fit and Compressive Strength of Monolithic Zirconia Crowns JO - Journal of Dentistry JA - DENTJODS LA - en SN - 2345-6485 AU - Mohghegh, Mina AU - Baseri, Sajjad AU - Kalantari, Mohamad Hassan AU - Giti, Rashin AU - Ghoraishian, Seyed Ahmad AD - Dept. of Prosthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran. AD - Postgraduate Student, Dept. of Prosthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran. Y1 - 2022 PY - 2022 VL - 23 IS - 3 SP - 307 EP - 313 KW - Compressive strength KW - experimental study KW - marginal fit KW - monolithic zirconia KW - sintering temperature DO - 10.30476/dentjods.2021.90024.1459 N2 - Statement of the Problem: Increasing the sintering temperature is suggested by some manufacturers as a way to enhance the translucency of monolithic zirconia crowns. Meanwhile, its effect on the marginal fit and compressive strength of the restoration is not fully understood. Purpose: This study aimed to evaluate the effect of sintering temperature on the marginal fit and compressive strength of monolithic zirconia crowns.Materials and Method: In this in vitro study, thirty crowns of pre-sintered monolithic zirconia were milled and sintered in a special furnace at either 1450°C or 1550°C (n=15 per group). The marginal gaps were measured at 18 spots on the dies with a digital microscope. To evaluate the compressive strength, the specimens were cemented on brass dies by using conventional glass ionomer cement. Vertical load was applied by a universal testing machine until fracture. One-way ANOVA test was used to analyze the results (α=0.05).Results: The marginal gap was not significantly different between the two groups (p= 0.062). A significantly higher mean value of compressive strength was observed in crowns sintered at 1550°c (1988.27±635.09 N) than those sintered at 1450 °c (1514.27±455.11 N) (p= 0.026).Conclusion: Although increasing the sintering temperature would not affect the marginal gap of monolithic zirconia crowns, it could significantly improve the compressive strength of zirconia restorations. UR - https://dentjods.sums.ac.ir/article_48409.html L1 - https://dentjods.sums.ac.ir/article_48409_aa8856fc0d06c9f4dd48dda477fabe81.pdf ER -