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A Journal on Dentistry and Maxillofacial Surgery

Official Journal of the Italian Society of Odontostomatology and Maxillofacial Surgery
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Minerva Stomatologica 2005 January-February;54(1-2):35-42

language: English, Italian

Reaction exothermia of 2 relining resins for temporary crowns

Bevilacqua L., Biasotto M., Cadenaro M., Di Lenarda R., Dorigo E.


Aim. The aim of the study was to evaluate the reaction exothermia of 2 relining resins for temporary crowns. The resins used were Duralay, a methacrylate-based resin, and Protemp II, a bisacrylic resin.
Methods. The coronal parts of an adult molar and of an impacted one were used. Abutments were ob-tained from the crowns, while the radicular part was sectioned in order to insert a thermocouple into the pulpal chamber. During the experiment the tooth with the polymerising resin was put into an oral cav-ity simulator to keep a constant temperature . The thermal increase during polymerisation of the 2 resins was recorded for 6 minutes at 5 seconds intervals and with 1 and 2.5 mm dentin thickness (n=10). Data were statistically analysed by variance analysis with Scheffé test.
Results. The intrapulpal thermal increase was significantly higher in relation to the type of resin (Duralay p<0.0001), thickness (1mm p<0.0001) and type of dentin (young dentin p<00001).
Conclusion. In order to protect the pulp, during the direct relining of a temporary crown, it is recommendable to choose the best combination among resin, type of dentin and its residual thickness, besides adequate cooling techniques.

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