Protective Effects of Base Cements against Intrapulpal Temperature Rise during Curing of Composite Resins An In Vitro Study by Pulpal Blood Microcirculation Model

OpenAlex İngilizce

Aim: Measuring the temperature increases in the pulp chamber during polymerization of resin composites when various base cements were applied on the cavity floor, by using a pulp microcirculation simulation model with physiologic temperature. Materials and methods:Study performed with four groups of 10 experiments each.Class V cavity with 3 x 4 x 2 mm 3 size was prepared on human mandibular premolar tooth with 1 mm pulpal wall thickness.Pulpal microcirculation and temperature regulation of the tooth within physiological limits performed with an experimental mechanism.In groups 1-3, polycarboxylate cement (PC), conventional glass ionomer cement (GIC) and resin-modified glass ionomer cement (RMGIC) were applied as base cements, respectively.No base material was used in group 4. Restorations were completed with the same composite resin and cured for equal time (20 s) using Demi™ Plus Dental-Curing-LED-Light (1200 mW/cm 2 ).Temperature increases (Δt) in the pulp during curing of resins were recorded and statistically analyzed with Mann-Whitney U and Kruskal-Wallis test.Results: The highest Δt values were measured in group 4 (5.76 ± 0.25), group 3 (5.44 ± 0.19), group 1 (4.95 ± 0.32) and group 2 (4.86 ± 0.4), respectively.There were statistically significant differences between group 2 and group 4, and groups 1 and group 4 in Δt values (p = 0.0001).Conclusion: Applying base cements is significantly effective in reducing the temperature increases generated in the pulp tissue.PC and GIC have been found to be more effective than RMGIC in preventing the pulp tissue against thermal stimuli. Clinical significance:This research is important to provide to clinicians critical information about the temperature increases which may occur in the pulp during curing of composite resins and precautions to be taken.