Dimensional Changes of Ceromer Crown by Water Absorption

Jong-Hyuk Lee

doi:10.4047/jkap.2009.47.2.119

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Lee: Dimensional Changes of Ceromer Crown by Water Absorption

ORIGINAL ARTICLE

J Korean Acad Prosthodont 2009;47(2):119-124.

Published online: 18 December 2009

DOI: https://doi.org/10.4047/jkap.2009.47.2.119

Dimensional Changes of Ceromer Crown by Water Absorption

Jong-Hyuk Lee, MSD, DDS, PhD^∗

Assistant professor, Department of Prosthodontics, College of Dentistry, Dankook University

Corresponding Author: Jong-Hyuk Lee Department of Prosthodontics, College of Dentistry, Dankook University, San 7-1, Shinboo-Dong, Cheonan, Choongnam, 330-716, Korea +82 41 550 1971: e-mail, hyuk928@dankook.ac.kr

Received 8 October 200823 October 2008 Accepted 1 October 2008

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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.

Conclusion

The dimensions and weight of the Ceromer restorations were changed by water absorption. The clinical crown shaped specimen showed more complicated dimensional changes than the simplified specimens.

Keywords: ceromer, water absorption, dimensional change, Targis^®, BelleGlass^®

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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.

Fig. 2.

Dimension of samples were measured with electrical caliper: A. Measuring height, B. Measuring width.

Fig. 3.

Weight of sample was measured with electrical balance.

Fig. 4.

Cumulated rate of dimensional changes depending on time. T: Targis^®, B: BelleGlass^®.

Table I.

Mean and standard deviation of accumulated change rate

Material		0 - 24 h		0 - 72 h		0 - 168 h
Material		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

^∗ : denotes significantly different with the others (P < .05).

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