title: Intrapulpal thermal changes during direct provisionalization using various autopolymerizing resins: Ex-vivo study.
abstract: BACKGROUND
  Resin materials used in the fabrication of direct provisional restoration exhibit an exothermic reaction and the extent of damage may also depend on the remaining dentine thickness. An ex-vivo study was envisaged to compare the time related temperature changes in the pulp chamber during the fabrication of fixed partial denture provisional restorations using direct technique. The effect of differently prepared teeth (with varying remaining dentine thickness) on the above mentioned temperature changes were also evaluated.
  
  
  METHODS
  Thermal changes were calculated in pulp chamber of three differently prepared tooth having different amount of remaining dentinal thickness (45 samples) and control with no tooth media (15 samples), using three different types of autopolymerizing provisional restorative materials using Cr/Al thermocouple connected to digital thermometer.
  
  
  RESULTS
  The data for the mean peak temperature rise was subjected to one way ANOVA analysis for relative comparison among subgroups within each main group and across the main groups. The results showed a statistically significant difference across both the subgroups and the main groups (p < 0.001). Then Turkey HSD test was applied to determine the significance of statistical difference between the means, within the groups. The differences in temperature rise were statistically significant for the three resins (p < 0.001).
  
  
  CONCLUSIONS
  Polymethylmethacrylate (DPI) showed the highest temperature rise value followed by polyethyl methacrylate (Tempron) and Bis-acrylate composite (CoolTemp). The maximum temperature rise was found on molar full veneer preparation followed by molar three quarter preparation and premolar three quarter preparation. Data and results from current study may assist clinicians to select an autopolymerizing provisional restorative resin when employing direct technique of fabricating provisional restorations for a specific tooth preparation which would cause minimal thermal trauma to pulpal tissue.
authors: Dental Officer (Prosthodontics), 33 Corps Dental Unit, C/o 99 APO, India.
authors: Ronauk
authors: R
authors: Singh
authors: Professor & Head, Dept of Prosthodontics, Saraswati Dental College, Lucknow, India.
authors: Arvind
authors: A
authors: Tripathi
authors: Associate Professor, Dept of Dental Surgery, Armed Forces Medical College, Pune 40, India.
authors: R K
authors: RK
authors: Dhiman
authors: Associate Professor, Dept of Dental Surgery, Armed Forces Medical College, Pune 40, India.
authors: Dinesh
authors: D
authors: Kumar
keywords: Abutment preparations; Autopolymerizing resins; Provisionalization; Pulp chamber; Remaining dentine thickness; Thermal Changes