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Article

Effect of Finish Line Design on the Fit Accuracy of CAD/CAM Monolithic Polymer-Infiltrated Ceramic-Network Fixed Dental Prostheses: An In Vitro Study

1
Department of Restorative Sciences (Prosthodontics), Faculty of Dentistry, Kuwait University, Kuwait 13110, Kuwait
2
Department of General Dental Practice, Faculty of Dentistry, Kuwait University, Kuwait 13110, Kuwait
3
Dental Department, Ministry of Health, Kuwait 13110, Kuwait
*
Author to whom correspondence should be addressed.
Academic Editors: Márk Fráter, Edina Lempel and Zsolt Tóth
Polymers 2021, 13(24), 4311; https://doi.org/10.3390/polym13244311
Received: 16 November 2021 / Revised: 5 December 2021 / Accepted: 6 December 2021 / Published: 9 December 2021
(This article belongs to the Special Issue Advanced Polymeric Materials for Dental Applications)
A polymer-infiltrated ceramic network (PICN) material has recently been introduced for dental use and evidence is developing regarding the fit accuracy of such crowns with different preparation designs. The aim of this in vitro study was to evaluate the precision of fit of machined monolithic PICN single crowns in comparison to lithium disilicate crowns in terms of marginal gap, internal gap, and absolute marginal discrepancies. A secondary aim was to assess the effect of finish line configuration on the fit accuracy of crowns made from the two materials. Two master metal dies were used to create forty stone dies, with twenty each for the two finish lines, shoulder and chamfer. The stone dies were scanned to produce virtual models, on which ceramic crowns were designed and milled, with ten each for the four material–finish line combinations (n = 10). Marginal gaps and absolute marginal discrepancies were evaluated at six pre-determined margin locations, and the internal gap was measured at 60 designated points using a stereomicroscope-based digital image analysis system. The influence of the material and finish line on the marginal and internal adaptation of crowns was assessed by analyzing the data using two-way analysis of variance (ANOVA), non-parametric, and Bonferroni multiple comparison post-hoc tests (α = 0.05). ANOVA revealed that the differences in the marginal gaps and the absolute marginal discrepancies between the two materials were significant (p < 0.05), but that those the finish line effect and the interaction were not significant (p > 0.05). Using the Mann–Whitney U test, the differences in IG for ‘material’ and ‘finish line’ were not found to be significant (p > 0.05). In conclusion, the finish line configuration did not seem to affect the marginal and internal adaptation of PICN and lithium disilicate crowns. The marginal gap of PICN crowns was below the clinically acceptable threshold of 120 µm. View Full-Text
Keywords: polymer/ceramic composites; biomaterials; marginal fit; internal gap; crown; computer-aided design and computer-aided manufacturing; resin; hybrid; urethane dimethacrylate; triethylene glycol dimethacrylate polymer/ceramic composites; biomaterials; marginal fit; internal gap; crown; computer-aided design and computer-aided manufacturing; resin; hybrid; urethane dimethacrylate; triethylene glycol dimethacrylate
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MDPI and ACS Style

Baig, M.R.; Akbar, A.A.; Embaireeg, M. Effect of Finish Line Design on the Fit Accuracy of CAD/CAM Monolithic Polymer-Infiltrated Ceramic-Network Fixed Dental Prostheses: An In Vitro Study. Polymers 2021, 13, 4311. https://doi.org/10.3390/polym13244311

AMA Style

Baig MR, Akbar AA, Embaireeg M. Effect of Finish Line Design on the Fit Accuracy of CAD/CAM Monolithic Polymer-Infiltrated Ceramic-Network Fixed Dental Prostheses: An In Vitro Study. Polymers. 2021; 13(24):4311. https://doi.org/10.3390/polym13244311

Chicago/Turabian Style

Baig, Mirza R., Aqdar A. Akbar, and Munira Embaireeg. 2021. "Effect of Finish Line Design on the Fit Accuracy of CAD/CAM Monolithic Polymer-Infiltrated Ceramic-Network Fixed Dental Prostheses: An In Vitro Study" Polymers 13, no. 24: 4311. https://doi.org/10.3390/polym13244311

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