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  Year : 2012 | Vol. 4 | Issue 5 : Page : 23-27
Evaluation Of Temperature Changes In Pulp Chamber During Direct Temporization Using Different Combinations Of Provisional Crown & Impression Materials - An In Vitro Study

Amarjit Singh Chadda 1 , P.R. Verma 2 , Archana Nagpal 3 , Rupandeep Kaur Samra 4 , Ramit Verma 5 , Vishal Katna 6

Address For Correspondence
Dr. Amarjit Singh Chadda
P.G. Student
Deptt Of Prosthodontics
Himachal Dental College Sundernagar
Himachal Pradesh

Objective of the study: Fabrication of provisional restoration is must after crown preparation. In clinical practice, the provisional crowns are made mostly by direct method. A study was thus planned to compare the temperature changes in the pulpal chamber during fabrication of provisional restorations by direct method using different matrices. Materials and method: A total of 80 provisional restorations were fabricated on a study model and divided into two main groups according to the material used for the fabrication of matrix. Group 1 - Irreversible hydrocolloid (Marieflex) impression index group, Group 2 - Polyvinylsiloxane putty (ExpressTM XT Putty) system group. The groups were further divided into four subgroups on the basis of provisional crown material used. Each subgroup had ten samples. Subgroup-A: Acry-lux (polymethylmethacrylate) as provisional crown material. Subgroup-B: DPI tooth moulding (polymethylmethacrylate) as provisional crown material Subgroup-C: ProtempTM4 (Bis-Acryl composite resin) as provisional crown material. Subgroup-D: Cooltemp (Bis-Acryl composite resin) as provisional crown material. A thermocouple probe (connected to a digital microprocessor thermometer) was inserted into the pulp chamber of an extracted mandibular second molar mounted on a study model. The intrapulpal temperature changes were observed during the fabrication of provisional restorations by direct method. ANOVA and student 't' test was used to find significant temperature difference. Results: The mean temperature rise observed between the subgroups in Group A - 1A, 1B, 1Cand1D was 2.09 0.11, 2.29 0.11, 1.13 0.08and1.25 0.11 respectively. The subgroups mean temperature rise observed in Group B-2A, 2B, 2Cand 2D was 4.22 0.18, 4.63 0.11, 2.02 0.07 and 2.19 0.07 respectively. The observations were statistically significant. Minimum rise in temperature was seen in the group with alginate as matrix and ProtempTM4 as the provisional crown material. Maximum rise in temperature was seen in the group with ExpressTM XT Putty system as the matrix and DPI tooth moulding as the provisional crown material. Conclusion: The intrapulpal temperature rise during fabrication of a provisional restoration depended both on the type of provisional restorative material and the type of matrix used. The clinician should be careful when selecting the resin and the matrix material combination while fabricating provisional restorations with direct method for better results.

Provisional restoration, Matrix, Thermocouple probe.

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