Intrapulpal temperature increases of 5.5°C may elicit a marked intrapulpal response both immediately and after prolonged intervals (Zach & Cohen, 1965). Objectives: This study compared the maximum intrapulpal temperature increases associated with the exothermic setting reaction of six temporary crown and bridge materials: Luxatemp (LUX), Protemp Garant 3 (PGT), Integrity INT, Temphase (TMP), Temporary Bridge Resin (TBR), Trim (TRM). Methods: The roots of a mandibular molar prepared for a full crown were suspended in a 37.0°C water bath. A peristaltic pump perfused the pulp chamber with 37.0°C water simulating a blood flow of 40-50ml/100g of tissue/min (Kim 1985). Intrapulpal and water bath temperatures were recorded with K-type thermocouples and an Omega PC-TC6 thermocouple card and data-logging software. A matrix formed prior to crown preparation allowed fabrication of temporaries with identical shape and volume of temporary resin for each trial. Five trials per material were recorded for 600s. Maximum temperature increases among groups were compared with a One-way ANOVA and Tukey HSD post hoc test (a=0.05). Results: Mean intrapulpal temperature increases ranged from 3.90 to 5.84°C. Mean intrapulpal temperatures °C, (S.D.), and homogeneous subset (indicated by subscript letter) in ascending order were: LUX 3.90 (0.19)_A, PGT 4.01 (0.41)_A, INT 4.51 (1.51)_A,B, TBR 4.65 (0.72)_A,B, TMP 5.71 (0.40)_B, TRM 5.84 (0.67)_B. Conclusions: TMP & TRM resulted in intrapulpal temperature increases > 5.5°C. While four materials had mean temperature increases <5.5°C only LUX and PGT were within the 95% confidence interval and significantly lower than TMP & TRM.

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