J Adv Prosthodont.  2017 Aug;9(4):294-301. 10.4047/jap.2017.9.4.294.

Influence of the material for preformed moulds on the polymerization temperature of resin materials for temporary FPDs

• Pott PC
• Schmitz-Wätjen H
• Stiesch M
• Eisenburger M

• KMID: 2398077
• DOI: http://doi.org/10.4047/jap.2017.9.4.294

Abstract

PURPOSE
Temperature increase of 5.5 ℃ can cause damage or necrosis of the pulp. Increasing temperature can be caused not only by mechanical factors, e.g. grinding, but also by exothermic polymerization reactions of resin materials. The aim of this study was to evaluate influences of the form material on the intrapulpal temperature during the polymerization of different self-curing resin materials for temporary restorations.
MATERIALS AND METHODS
30 provisonal bridges were made of 5 resin materials: Prevision Temp (Pre), Protemp 4 (Pro), Luxatemp Star (Lux), Structure 3 (Str) and an experimental material (Exp). Moulds made of alginate (A) and of silicone (S) and vacuum formed moulds (V) were used to build 10 bridges each on a special experimental setup. The intrapulpal temperatures of three abutment teeth (a canine, a premolar, and a molar,) were measured during the polymerization every second under isothermal conditions. Comparisons of the maximum temperature (T(Max)) and the time until the maximum temperature (t(TMax)) were performed using ANOVA and Tukey Test.
RESULTS
Using alginate as the mould material resulted in a cooling effect for every resin material. Using the vacuum formed mould, T(Max) increased significantly compared to alginate (P<.001) and silicone (P<.001). In groups Lux, Pro, and Pre, t(TMax) increased when the vacuum formed moulds were used. In groups Exp and Str, there was no influence of the mould material on t(TMax).
CONCLUSION
All of the mould materials are suitable for clinical use if the intraoral application time does not exceed the manufacturer's instructions for the resin materials.

Keyword

Temporary restoration; Temperature; Material; Form material; Resin

MeSH Terms

Bicuspid
Necrosis
Polymerization*
Polymers*
Silicon
Silicones
Tooth
Vacuum
Polymers
Silicon
Silicones

Figure

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  Fig. 1 Lab-side prefabricated vacuum-formed mould for temporary restorations in clinical use.

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  Fig. 2 Experimental setup, overview (A), prepared teeth (B) and radiograph of the temperature sensors in the teeth (C).

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  Fig. 3 Wax-up (A), metal bridge (B) and resin model of the bridge positioned onto the measurement arrangement (C).

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  Fig. 4 An example of temperature profiles on measuring point “P” during one measurement each of the experimental material (Exp) in combination with alginate, silicone, and the vacuum formed mould.

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  Fig. 5 Boxplot of the intra-pulpal temperature at the measuring points C, P, Mb, and Mo for all groups. The baseline temperature and the temperature interval of +/- 5.5℃ are also given.

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  Fig. 6 Boxplot of the time until the maximum temperature during polymerization is reached. The manufacturer's instructions for intraoral working time (blue lines) and the time until complete polymerization (red lines) are also given.

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