title: The effect of dentin desensitizer with different layers on thermal changes on the pulp during fabrication of provisional restoration.
abstract: OBJECTIVE
  This study investigated the effects of different desensitizers and an adhesive material application on pulpal temperature rise during direct provisional restoration polymerization.
  
  
  METHODS
  Two dentin desensitizers (Systemp, Ivoclar; BisBlock, Bisco) and a dentin adhesive (Prime Bond, Dentsply) were applied to the dentin surfaces as single layer or double layer. One autopolymerizing methacrylate (Prevision, Heraeus Kulzer) and one light polymerizing composite (Revotek LC, GC) provisional restoration materials were used in this study. A total of 160 dentin disks were prepared from extracted molars. These dentin disks were placed on an apparatus developed to measure temperature rise. After the desensitizer or dentin adhesive application, provisional materials were polymerized according to the manufacturers' instructions. The temperature increase was measured under the dentin disk with a J-type thermocouple wire that was connected to a data logger. Differences between initial and highest temperature reading were taken, and 10 readings were averaged to determine the mean value in temperature rise. Statistical analysis was performed with three-way analysis of variance followed by Tukey HSD test (alpha = 0.05).
  
  
  RESULTS
  Temperature rise varied according to the provisional restoration material used (composite resin, methacrylate) (p < 0.001), the agent thickness (single, double) (p < 0.001), and the agent (desensitizer, adhesive) (p < 0.001). The composite resin-based provisional material induced higher thermal changes than methacrylate based provisional material (p < 0.01).
  
  
  CONCLUSIONS
  The thickness of desensitizing agents affected the thermal changes; however, the desensitizers did not affect on the intrapulpal temperature although the type of provisional material used may be effective.
authors.affiliation: Department of Prosthodontics, Faculty of Dentistry, Erciyes University, Kayseri, Turkey.
authors.forename: Aysegul G
authors.initials: AG
authors.lastname: Gurbulak
authors.forename: Kerem
authors.initials: K
authors.lastname: Kiliç
authors.forename: Mustafa
authors.initials: M
authors.lastname: Zortuk
authors.forename: Aslihan
authors.initials: A
authors.lastname: Usumez
mesh_terms: D003764:Dental Materials / Q000737:chemistry / Q000494:pharmacology*; D003782:Dental Pulp / Q000187:drug effects*; D003794:Dental Restoration, Temporary; D003804:Dentin / Q000187:drug effects*; D003807:Dentin Sensitivity; D017220:Dentin-Bonding Agents / Q000737:chemistry / Q000494:pharmacology*; D006801:Humans; D013696:Temperature
chemical_list: D003764:Dental Materials; D017220:Dentin-Bonding Agents