Comparative evaluation of optical properties of lithium disilicate crowns fabricated by pressable and CAD CAM methods – An in vitro study

Q1 Medicine

Journal of oral biology and craniofacial research Pub Date : 2025-08-11 DOI:10.1016/j.jobcr.2025.08.001

Shweta A. Gaikwad, Amit K. Jagtap, V.N.V. Madhav

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引用次数: 0

Abstract

Aim

The aim of this study was to compare the optical performance of pressable and milled lithium disilicate crowns, focusing on their shade-matching accuracy against the VITA Classical A1 shade guide.

Material and methods

20 samples each of lithium disilicate crowns were fabricated using pressable and CAD/CAM-milled techniques and VITA A1 shade tab as the control. A spectrophotometer was used to measure the optical properties of the crown, namely, brightness (L∗), red-green (a∗), blue-yellow (b∗), and color difference (ΔE) values. Data obtained was analyzed statistically to assess shade-matching precision and optical differences.

Results

The lightness (L∗) value of the pressable group (92.22 ± 2.67) was significantly higher than that of the milled group (88.10 ± 1.08) and the control group (87.78 ± 0.08). Regarding the red–green axis (a∗), the pressable group had the highest mean value (0.97 ± 0.37), followed by milled (0.85 ± 0.24) and control (0.35 ± 0.11), showed statistically significant differences. In terms of yellow-blue chroma (b), the pressable crowns recorded the highest value (14.89 ± 0.99), followed by the control (14.43 ± 0.07) and milled (13.56 ± 0.25). Milled crowns exhibited a significantly lower ΔE (1.49 ± 0.42) compared to pressable crowns (4.71 ± 2.55).

Conclusion

Milled lithium disilicate crowns showed superior shade-matching accuracy, which exhibited lower color difference (ΔE) values, inferring closer color alignment with the A1 standard. Pressable crowns showed enhanced translucency and esthetic vibrancy as contributed by higher brightness and chromatic intensity, but exhibited greater variability in color matching.

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加压法与CAD - CAM法制备二硅酸锂冠光学性能的比较研究

本研究的目的是比较可压型和研磨型二硅酸锂冠的光学性能，重点关注其与VITA classic A1荫蔽指南的荫蔽匹配精度。材料与方法采用可压加工和CAD/ cam铣削工艺，以VITA A1遮光片为对照，制作了各20个二硅酸锂冠样品。用分光光度计测量冠的光学性质，即亮度（L∗）、红绿（A∗）、蓝黄（b∗）和色差（ΔE）值。对获得的数据进行统计分析，以评估阴影匹配精度和光学差异。结果挤压组的亮度（L∗）值（92.22±2.67）显著高于碾压组（88.10±1.08）和对照组（87.78±0.08）。红绿轴（a∗），可压组平均值最高（0.97±0.37），其次为铣削组（0.85±0.24）和对照组（0.35±0.11），差异有统计学意义。黄蓝色度(b)以压冠最高（14.89±0.99），其次为对照（14.43±0.07）和磨冠（13.56±0.25）。铣冠的ΔE值（1.49±0.42）明显低于压冠（4.71±2.55）。结论研磨后的二硅酸锂冠具有较好的色差匹配精度（ΔE），与A1标准色差更接近。可压冠具有较高的亮度和色彩强度，增强了其半透明性和审美活力，但在颜色匹配上表现出较大的变异性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of oral biology and craniofacial research Medicine-Otorhinolaryngology

CiteScore

4.90

自引率

0.00%

发文量

133

审稿时长

167 days

期刊介绍： Journal of Oral Biology and Craniofacial Research (JOBCR)is the official journal of the Craniofacial Research Foundation (CRF). The journal aims to provide a common platform for both clinical and translational research and to promote interdisciplinary sciences in craniofacial region. JOBCR publishes content that includes diseases, injuries and defects in the head, neck, face, jaws and the hard and soft tissues of the mouth and jaws and face region; diagnosis and medical management of diseases specific to the orofacial tissues and of oral manifestations of systemic diseases; studies on identifying populations at risk of oral disease or in need of specific care, and comparing regional, environmental, social, and access similarities and differences in dental care between populations; diseases of the mouth and related structures like salivary glands, temporomandibular joints, facial muscles and perioral skin; biomedical engineering, tissue engineering and stem cells. The journal publishes reviews, commentaries, peer-reviewed original research articles, short communication, and case reports.