Pott Philipp-Cornelius, Schmitz-Wätjen Hans, Stiesch Meike, Eisenburger Michael
Department of Prosthetic Dentistry and Biomedical Materials Research, Hannover Medical School, Hannover, Germany.
J Adv Prosthodont. 2017 Aug;9(4):294-301. doi: 10.4047/jap.2017.9.4.294. Epub 2017 Aug 16.
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.
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) and the time until the maximum temperature (t) were performed using ANOVA and Tukey Test.
Using alginate as the mould material resulted in a cooling effect for every resin material. Using the vacuum formed mould, T increased significantly compared to alginate (<.001) and silicone (<.001). In groups Lux, Pro, and Pre, t increased when the vacuum formed moulds were used. In groups Exp and Str, there was no influence of the mould material on t.
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.
温度升高5.5℃可导致牙髓损伤或坏死。温度升高不仅可由机械因素引起，如研磨，还可由树脂材料的放热聚合反应引起。本研究的目的是评估不同自凝树脂材料用于临时修复体聚合过程中，成型材料对牙髓腔内温度的影响。
用5种树脂材料制作30个临时桥：Prevision Temp（Pre）、Protemp 4（Pro）、Luxatemp Star（Lux）、Structure 3（Str）和一种实验材料（Exp）。使用藻酸盐（A）和硅橡胶（S）制成的模具以及真空成型模具（V），在一个特殊的实验装置上分别制作10个临时桥。在等温条件下，每隔一秒测量三个基牙（一颗尖牙、一颗前磨牙和一颗磨牙）在聚合过程中的牙髓腔内温度。使用方差分析和Tukey检验对最高温度（T）和达到最高温度所需时间（t）进行比较。
使用藻酸盐作为模具材料时，每种树脂材料都有冷却效果。与藻酸盐（<.001）和硅橡胶（<.001）相比，使用真空成型模具时T显著升高。在Lux、Pro和Pre组中，使用真空成型模具时t增加。在Exp和Str组中，模具材料对t没有影响。
如果口腔内应用时间不超过树脂材料制造商的说明，所有模具材料都适用于临床。
