Effect of hygroscopic expansion of resin filling on interfacial gap and sealing: a confocal microscopy study.
Effect of hygroscopic expansion of resin filling on interfacial gap and sealing: a confocal microscopy study.
复制标题
树脂填充吸湿膨胀对界面间隙和密封的影响：共焦显微镜研究。
DOI：
10.3290/j.jad.a29529
复制
发表时间：
2013
影响因子：
3.3
通讯作者：
M. Cabrerizo
中科院分区：
文献类型：
--
作者：
J. Rosales;Ramón Del Castillo;María A Molino;Humberto González;M. Cabrerizo
目的
测量尺寸变化，由于吸湿膨胀和他们的影响，在四个光固化修复材料的界面间隙和密封使用一个原始的共聚焦显微镜方法。
材料和方法
测试的材料是一种ormocer（Admira [Voco]）、一种复合物（Dyract AP [Dentsply]）、一种混合复合材料（Spectrum [Dentsply]）和一种纳米混合复合材料（Esthet·X [Dentsply]）。通过在浸渍后称重材料盘来评估吸水性。吸湿性膨胀测量从体积变化的材料填充在牙本质切片中的圆柱形腔的界面间隙的大小从相同的腔使用一种新的共聚焦显微镜方法。微渗漏进行了评价，在洞制备提取的第三磨牙。测量分别在水中浸泡24小时、1周、4周和8周。使用因子ANOVA、用于事后比较的Student纽曼Keuls检验、Student t检验和Pearson检验进行统计分析（p < 0.05）。
结果
吸水性、吸湿膨胀性和密封性之间呈正相关。吸湿膨胀减少了聚合后的界面间隙并改善了腔体密封。Dyract AP和Admira表现出最高的吸水性、吸湿膨胀和间隙尺寸减小。
结论
1.所提出的方法是有效的测量吸湿膨胀和界面间隙。2.吸水性和吸湿膨胀正相关，吸湿膨胀、间隙尺寸和密封性也正相关。3.胶粘剂影响界面间隙的大小及其在吸湿膨胀后的变化。4.吸湿膨胀减少了聚合收缩产生的界面间隙，并改善了腔体密封。
PURPOSE
To measure dimensional changes due to hygroscopic expansion and their effect on interface gaps and sealing in four light-cured restorative materials using an original confocal microscopic methodology.
MATERIALS AND METHODS
The materials tested were an ormocer (Admira [Voco]), a compomer (Dyract AP [Dentsply]), a hybrid composite (Spectrum [Dentsply]), and a nanohybrid composite (Esthet·X [Dentsply]). Water sorption was evaluated by weighing material disks after immersion. Hygroscopic expansion was measured from volumetric variations of material fillings in cylindrical cavities in dentin slices; the interfacial gap size was obtained from the same cavities using a novel confocal microscopic method. Microleakage was evaluated in cavities prepared in extracted third molars. Measurements followed water immersion for 24 h, 1 week, 4 weeks, and 8 weeks. A factorial ANOVA, the Student Newman Keuls test for post-hoc comparisons, the Student's t-test, and the Pearson test were used for the statistical analysis (p < 0.05).
RESULTS
Positive correlations were found among water sorption, hygroscopic expansion, and sealing. Hygroscopic expansion reduced post-polymerization interfacial gaps and improved cavity sealing. Dyract AP and Admira showed the highest water sorption, hygroscopic expansion, and gap size reduction.
CONCLUSIONS
1. The proposed methodology is valid to measure hygroscopic expansion and interfacial gap. 2. Water sorption and hygroscopic expansion are positively correlated, and hygroscopic expansion, gap size, and sealing are also positively correlated. 3. The adhesive influences the interfacial gap size and its variation after hygroscopic expansion. 4. Hygroscopic expansion reduces the interfacial gaps generated by polymerization shrinkage and improves cavity sealing.