Daneshpooy Mehdi, Kimyai Soodabeh, Allahyari Sani Romina
Department of Operative Dentistry, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran.
J Dent Res Dent Clin Dent Prospects. 2024 Spring;18(2):110-114. doi: 10.34172/joddd.41167. Epub 2024 Jun 24.
This study assessed the effect of repeated preheating of three types of composite resins and a giomer on their color stability.
In this in vitro study, 128 composite resin and giomer specimens with a 10-mm diameter and a 2-mm height were evaluated in eight groups (n=16) of Heliomolar microfilled, Brilliant Enamel microhybrid, and Tetric N-Ceram nanohybrid composite resins, and Beautifil II giomer used at room temperature and also after preheating of the tube in a water bath at 55‒60 °C for 40 times. After preparing the specimens, their color parameters were measured by a spectrophotometer. The specimens were immersed in a tea solution for 3 hours/day for 40 days and underwent spectrophotometric color assessment again. The color change (∆E) was calculated and analyzed by two-way ANOVA (α=0.05).
The effects of composite resin type (<0.001) and preheating (<0.001) and their interaction effect (<0.001) were significant on ∆E. Immersion in a tea solution caused a significantly greater color change in giomer (<0.05). The ∆E of the microfilled composite resin was significantly higher than that of nanohybrid (=0.003) and microhybrid composite resin (=0.004).
Repeated preheating of giomer, microhybrid, and nanohybrid composite resin specimens to 55‒60 °C for 40 times adversely affected their color stability in the tea solution. The color change was significantly greater for giomer.
本研究评估了三种复合树脂和一种聚酸改性复合树脂反复预热对其颜色稳定性的影响。
在这项体外研究中，对128个直径10毫米、高2毫米的复合树脂和聚酸改性复合树脂标本进行评估，分为八组（n = 16），分别为Heliomolar微填料复合树脂、Brilliant Enamel微混合复合树脂、Tetric N-Ceram纳米混合复合树脂，以及Beautifil II聚酸改性复合树脂，分别在室温下以及将根管在55‒60 °C水浴中预热40次后使用。制备标本后，用分光光度计测量其颜色参数。将标本每天浸泡在茶溶液中3小时，持续40天，然后再次进行分光光度颜色评估。计算颜色变化（∆E），并通过双向方差分析进行分析（α = 0.05）。
复合树脂类型（<0.001）、预热（<0.001）及其交互作用（<0.001）对∆E有显著影响。浸泡在茶溶液中导致聚酸改性复合树脂的颜色变化显著更大（<0.05）。微填料复合树脂的∆E显著高于纳米混合复合树脂（=0.003）和微混合复合树脂（=0.004）。
将聚酸改性复合树脂、微混合复合树脂和纳米混合复合树脂标本反复预热至55‒60 °C 40次会对其在茶溶液中的颜色稳定性产生不利影响。聚酸改性复合树脂的颜色变化显著更大。
