title: Comparison of temperature rise in pulp chamber during polymerization of materials used for direct fabrication of provisional restorations: An in-vitro study.
abstract: OBJECTIVE
  The purpose is to compare temperature rise in the pulp chamber during fabrication of provisional crowns using different materials and on different types of teeth using direct technique.
  
  
  METHODS
  An extracted, sound, caries free maxillary central incisor and a mandibular molar were selected for the study and crown preparations of all ceramic and all metal were done on central incisor and mandibular molar, respectively. Materials tested were DPI tooth molding self-curing material and protemp-4. Addition silicone putty was used as a matrix and 80 provisional crowns were fabricated, of which 40 were on central incisor and 40 on mandibular molar. Depending on the type of material used, they were further divided into two subgroups: Each comprising 20 provisional crowns. Temperature readings were recorded using K type of thermocouple with 0.1°C precision digital thermometer.
  
  
  METHODS
  Analysis of variance, Tukey honest significant difference and Kruskall-Wallis H-test.
  
  
  RESULTS
  Statistically significant difference exists between two materials tested on the basis of peak temperature achieved and time taken by a particular material to reach peak temperature. Peak temperature achieved was highest for provisional crowns with DPI tooth molding self-curing material on maxillary central incisor (40.39 + 0.46), followed by DPI tooth molding self-curing material on mandibular molar (40.03 + 0.32), protemp-4 on maxillary central incisor (39.46 + 0.26) and least with protemp-4 on mandibular molar (39.09 + 0.33). The time taken to reach peak temperature was almost double in DPI tooth molding self-curing material (5 min) than in protemp-4.
  
  
  CONCLUSIONS
  Polymethyl methacrylate resin produced higher intra-pulpal rise when compared to newer generation bis-acrylic composite.
authors.affiliation: Department of Prosthodontics and Dental Materials, I. G. G. D. C, Jammu, Jammu and Kashmir, India.
authors.forename: Rajat R
authors.initials: RR
authors.lastname: Khajuria
authors.affiliation: Department of Prosthodontics and Dental Materials, Kothiwal Dental College, Moradabad, Uttar Pradesh, India.
authors.forename: Ravi
authors.initials: R
authors.lastname: Madan
authors.affiliation: Department of Prosthodontics and Dental Materials, Kothiwal Dental College, Moradabad, Uttar Pradesh, India.
authors.forename: Swatantra
authors.initials: S
authors.lastname: Agarwal
authors.affiliation: Department of Prosthodontics and Dental Materials, I. G. G. D. C, Jammu, Jammu and Kashmir, India.
authors.forename: Reecha
authors.initials: R
authors.lastname: Gupta
authors.affiliation: Department of Prosthodontics and Dental Materials, S. J. M. Dental College, Chitradurga, Karnataka, India.
authors.forename: Sunil V
authors.initials: SV
authors.lastname: Vadavadgi
authors.affiliation: Department of Prosthodontics and Dental Materials, Kothiwal Dental College, Moradabad, Uttar Pradesh, India.
authors.forename: Vikas
authors.initials: V
authors.lastname: Sharma
keywords: Bis-acrylic composite resin; exothermic heat; polymethyl methacrylate resin; provisional restorations