[The study of the monomer release from four kinds of temporary crown material by infrared spectrum].

Purpose: To study the quantity and characteristic of monomer release from four kinds of temporary crown material.

Methods: The experimental animal model was established by temporary prosthesis on dogs' teeth using four kinds of temporary crown materials.The quantity of residual monomer in temporary crown material was measured by infrared spectra at four different periods before and after wearing crowns. The data were analysed with SAS6.12 software package for one-way ANOVA.

Results: During the early period after wearing temporary crowns, the quantity of residual monomer from self-curing resin crowns and heat-curing resin crowns was significantly more than that from DMG-TEMP crown material and Shofu SWIFT-TEMP resin. With the time going on, the difference became less. The residual monomer in DMG-TEMP crown material and Shofu SWIFT-TEMP resin remained steady at a low level all the time, without significant monomer release.

Conclusions: There is significant monomer release from self-curing resin crowns and heat-curing resin crowns early after wearing temporary crowns. DMG-TEMP crowns and Shofu SWIFT-TEMP crowns don't release significant residual monomer.