Comparative Evaluation of Transmittance Between Zirconium Di-Oxide Crown and Human Natural Tooth Crown: An In-Vitro Study
Abstract
Background: The transmittance/translucency of a dental crown is a crucial property that affects the color of a dental crown. The characteristics of the crown material and background contrast affect the transmittance of the value of the crown material.
Objective: This study was aimed to evaluate and compare the transmittance between zirconium dioxide crown and natural human tooth crown.
Methods: An in-vitro study was conducted at Department of Prosthodontics, Bangabandhu Sheikh Mujib Medical University. A total of 20 specimens/crowns prepared with zirconium di-oxide and 20 specimens/crowns of natural human tooth crown. A total of 40 crowns/specimens were included for testing transmittance/ translucency individually. The thickness of outer layer of these specimens was uniform in accordance with the American Dental Association (ADA) specifications. The zirconia crown preparation on model was done. The outer layer of both group of crown specimens was 2 mm in thickness. Fourier-transform infrared spectroscopy (FTIR) test was used to evaluate the transmittance/ translucency value of samples. This test was carried out using the FTIR test at Chemical Engineering Department of Bangladesh University of Engineering and Technology. A FTIR test was used to measure the contrast ratio, which is indicative of transmittance level. The transmittance of the specimens was recorded with the help check list. The transmittance values were analyzed by One Sample T Test to determine the mean value with its standard deviation for each group. To compare between two groups, P≤0.05 was considered.
Results: The mean transmittance value (409.4±.7) cm-1 wavelength of natural tooth crown is less than zirconium di-oxide crown (467.2±.8) cm-1 wave length when intact form of sample was tested and it was significant (P 0.001). In addition, the mean of transmittance value (560.6±) cm-1 wavelength of natural tooth crown was lower than zirconium di-oxide crown (596.18) cm-1 wavelength when grinded form of sample was tested and it was also significant (P 0.001).
Conclusion: To conclude, the zirconia crown in both intact and grinded form showed more transmittance/ translucency when compared with the natural human tooth crown or enamel. So, it is expected that this study will help the dental professional to choose the zirconia as crown material to fulfill the patient’s satisfaction.
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