We are using cookies to implement functions like login, shopping cart or language selection for this website. Furthermore we use Google Analytics to create anonymized statistical reports of the usage which creates Cookies too. You will find more information in our privacy policy.
OK, I agree I do not want Google Analytics-Cookies
Quintessence International



Forgotten password?


Quintessence Int 50 (2019), No. 5     12. Apr. 2019
Quintessence Int 50 (2019), No. 5  (12.04.2019)

Page 378-386, doi:10.3290/j.qi.a42343, PubMed:30957112

Effectiveness of surface texture simulation of fixed dental prostheses by curvature analysis
Chen, Xin / Mao, Bochun / Zhu, Zhuoli / Zhang, Qianqian / Yue, Li / Yu, Haiyang
Objective: The current design methods for the surface texture of prostheses are unsatisfactory: the line-drawing method relies heavily on the subjective experience of technicians, and the powder-coating method requires high costs. A new innovative method is proposed: curvature-analysis with reverse engineering. The objective was to compare operation times and esthetic parameters in generating surface textures among the three methods.
Method and materials: Twenty-seven patients with maxillary central incisor fixed dental prostheses were randomly divided into three groups, and prostheses were built by three technicians using line-drawing, powder-coating, or curvature-analysis methods, respectively. Porcelain grinding times were recorded. The final prostheses were analyzed regarding the three-dimensional deviation from the control group that used the contralateral tooth. A senior technician and clinician made a single-blind evaluation of the prostheses' surface texture.
Results: In the curvature-analysis method, large, medium, and small curvatures effectively showed an intrinsic labial surface, the developmental groove, and other surface morphology structures, respectively. Operation times in the line-drawing, powder-coating, and curvature-analysis methods were 19.51 ± 0.95, 16.87 ± 1.30, and 12.41 ± 0.94 minutes, respectively, with statistically significant differences among the three methods; evaluation scores were statistically significantly different between the line-drawing and curvature-analysis methods. The three-dimensional deviation root mean square values were 0.451 ± 0.083, 0.396 ± 0.029, and 0.295 ± 0.080 mm, respectively, indicating curvature analysis had the smallest three-dimensional deviation.
Conclusions: Curvature analysis helps manufacture the surface texture accurately with enhanced efficiency, improving esthetics and reducing operation time and material waste.

Keywords: curvature, dental technology, fixed dental prosthesis, reverse engineering, surface texture, three-dimensional deviation