Abstract
Statement of problem
The increasing demand for esthetic restorations has been required developing new materials for tooth colored restoration. Ceromer (Ceramic Optimized Polymer) has some advantages over porcelain, and has gained increasing popularity in restorative dentistry. However, there is little information on the dimensional changes in a clinical restoration in moist conditions.
Purpose
This study examined the dimensional changes in Ceromer restorations with a clinical crown shape that were fabricated in a clinical manner.
Material and methods
The crowns for the maxillary central incisor were fabricated with two Ceromers (BelleGlass® and Targis®) using a similar clinical restoration manufacturing technique. A total of twenty specimens were prepared and immersed in distilled water at room temperature to allow for water absorption. The weight, height and width were measured at 24, 72 and 168 hours. The accumulated ratios of the changes were calculated and evaluated using a paired t-test and an independent independent t-test.
Results
The dimensions and weight increased with increasing soaking time. Targis® showed significant differences in height and weight between 24 hours and the other times (P < .05). BelleGlass® showed significant differences in width and weight between 24 hours and the other times. The two materials showed different changing patterns of the dimensions but there were no statistically significant differences between them.
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Fig. 1.
Marked reference points. Middle of incisal edge, lowest part of cervical margin and two proximal contact points were selected. Black arrows indicate reference points for mesiodistal width, White arrows indicate reference points for crown height.
![jkap-47-119f1.tif](/upload/SynapseXML/0084jkap/thumb/jkap-47-119f1.gif)
Fig. 2.
Dimension of samples were measured with electrical caliper: A. Measuring height, B. Measuring width.
![jkap-47-119f2.tif](/upload/SynapseXML/0084jkap/thumb/jkap-47-119f2.gif)
Table I.
Mean and standard deviation of accumulated change rate
Material | 0 - 24 h | 0 - 72 h | 0 - 168 h | ||||
---|---|---|---|---|---|---|---|
Mean | SD | Mean | SD | Mean | SD | ||
Targis® | Height (%) | 0.010∗ | 0.069 | 0.065 | 0.063 | 0.065 | 0.063 |
Width (%) | 0.044 | 0.077 | 0.078 | 0.091 | 0.078 | 0.091 | |
Weight (%) | 0.139∗ | 0.139 | 0.316 | 0.162 | 0.351 | 0.169 | |
BelleGlass® | Height (%) | 0.029 | 0.047 | 0.029 | 0.065 | 0.058 | 0.081 |
Width (%) | 0.034∗ | 0.093 | 0.147 | 0.151 | 0.159 | 0.162 | |
Weight (%) | 0.273∗ | 0.296 | 0.542 | 0.367 | 0.589 | 0.365 |