加工后不同时间间隔下硬质椅旁和实验室热固化重衬树脂线性尺寸精度的评估。

Evaluation of linear dimensional accuracy of hard chairside and laboratory heat cure reline resins at different time intervals after processing.

作者信息

Tewary Shivsagar, Pawashe Karuna G

机构信息

Department of Prosthodontics, School of Dental Sciences, Krishna Institute of Medical Sciences, Deemed University, Malkapur, Karad, Satara, Maharashtra, India.

出版信息

Indian J Dent Res. 2014 Nov-Dec;25(6):686-91. doi: 10.4103/0970-9290.152162.

DOI:10.4103/0970-9290.152162

PMID:25728097

Abstract

CONTEXT

Relining with heat cure denture base resin is time-consuming and the patient has to remain without dentures within this period. Recently, some autopolymerizing resins marketed as hard chairside reline systems with low exothermic heat allow the dentists to reline prosthesis directly in the mouth. However, the decision to use these materials must be based on physical properties such as dimensional accuracy that directly influences the accuracy of fit of the denture base.

AIM

The aim was to compare the linear dimensional changes of two hard chairside reline resins with two laboratory heat cure resins at 3 times intervals after processing.

SETTINGS AND DESIGN

A stainless steel split mold (International Organization for Standardization 1567) was used for sample fabrication. Five measurements of the reference dimensions (AB and CD) were measured directly from the mold and the samples with a profile projector, and mean difference were calculated.

SUBJECTS AND METHODS

Forty samples were fabricated by incorporating the split mold into first pour of denture flasks and packing each of the chairside reline resins ("Kooliner" and "Ufi Gel Hard") and laboratory heat cure resins ("Dental Products of India Heat Cure" and "Trevalon"). The mean difference in dimensional change at 3 times intervals (0 h, 4 days and 2 months) were calculated and subjected to statistical analysis.

STATISTICAL ANALYSIS USED

One-way ANOVA, RMANOVA and post hoc Tukey's tests.

RESULTS

All resins showed different levels of significant shrinkage (P<0.001) after processing (T0) ranging from -0.128 to -0.310 mm. After 4 days (T1), there was significant shrinkage (P<0.001) ranging from -0.168 to -0.296 mm. After 2 months (T2), there was again significant shrinkage (P<0.001) ranging from -0.018 to -0.216 mm. Chairside reline resins showed less dimensional shrinkage at each time interval than the laboratory heat cure resins.

CONCLUSIONS

Hard chairside resins are dimensionally accurate than the laboratory heat cure resins.

摘要

背景

用热凝义齿基托树脂重衬耗时，且在此期间患者必须不戴义齿。最近，一些作为低放热硬椅旁重衬系统销售的自凝树脂使牙医能够直接在口腔内重衬义齿。然而，决定使用这些材料必须基于诸如尺寸精度等物理特性，尺寸精度直接影响义齿基托的贴合精度。

目的

目的是比较两种硬椅旁重衬树脂与两种实验室热凝树脂在加工后3个时间间隔的线性尺寸变化。

设置与设计

使用不锈钢分体模具（国际标准化组织1567）制作样本。用轮廓投影仪直接从模具和样本上测量参考尺寸（AB和CD）的五次测量值，并计算平均差值。

对象与方法

通过将分体模具放入义齿型盒的第一次灌注中，并填充每种椅旁重衬树脂（“Kooliner”和“Ufi Gel Hard”）以及实验室热凝树脂（“印度牙科产品热凝树脂”和“Trevalon”）制作40个样本。计算3个时间间隔（0小时、4天和2个月）尺寸变化的平均差值，并进行统计分析。

所用统计分析

单因素方差分析、重复测量方差分析和事后Tukey检验。

结果

所有树脂在加工后（T0）均表现出不同程度的显著收缩（P<0.001），收缩范围为-0.128至-0.310毫米。4天后（T1），收缩显著（P<0.001），范围为-0.168至-0.296毫米。2个月后（T2），再次出现显著收缩（P<0.001），范围为-0.018至-0.216毫米。椅旁重衬树脂在每个时间间隔的尺寸收缩均小于实验室热凝树脂。