Comparative in vitro evaluation of CAD/CAM vs conventional provisional crowns

• Published in: Journal of applied oral science Vol. 24; no. 3; pp. 258 - 263
• Main Authors: ABDULLAH, Adil Othman, TSITROU, Effrosyni A, POLLINGTON, Sarah
• Format: Journal Article
• Language: English
• Published: Brazil Faculdade De Odontologia De Bauru - USP 01.05.2016; University of São Paulo
• Subjects: Acrylic Resins; Analysis of Variance; CAD-CAM; Composite Resins; Computer-Aided Design; Crowns; Dental crowns; Dental impression technique; Dental Marginal Adaptation; Dental prosthesis; Dental Prosthesis Design - methods; Dental Restoration Failure; DENTISTRY, ORAL SURGERY & MEDICINE; Ketones; Materials Testing; Original; Polyethylene Glycols; Reference Values; Reproducibility of Results; Statistics, Nonparametric; Temporary dental restoration; Tooth Fractures; CAD-CAM; Dental marginal adaptation; Dental impression technique; Dental crowns; Dental prosthesis; Temporary dental restoration
• ISSN: 1678-7757; 1678-7765; 1678-7757; 1678-7765
• DOI: 10.1590/1678-775720150451

This study compared the marginal gap, internal fit, fracture strength, and mode of fracture of CAD/CAM provisional crowns with that of direct provisional crowns. An upper right first premolar phantom tooth was prepared for full ceramic crown following tooth preparation guidelines. The materials tested were: VITA CAD-Temp®, Polyetheretherketone "PEEK", Telio CAD-Temp, and Protemp™4 (control group). The crowns were divided into four groups (n=10), Group1: VITA CAD-Temp®, Group 2: PEEK, Group 3: Telio CAD-Temp, and Group 4: Protemp™4. Each crown was investigated for marginal and internal fit, fracture strength, and mode of fracture. Statistical analysis was performed using GraphPad Prism software version 6.0. The average marginal gap was: VITA CAD-Temp® 60.61 (±9.99) µm, PEEK 46.75 (±8.26) µm, Telio CAD-Temp 56.10 (±5.65) µm, and Protemp™4 193.07(±35.96) µm (P<0.001). The average internal fit was: VITA CAD-Temp® 124.94 (±22.96) µm, PEEK 113.14 (±23.55) µm, Telio CAD-Temp 110.95 (±11.64) µm, and Protemp™4 143.48(±26.74) µm. The average fracture strength was: VITA CAD-Temp® 361.01 (±21.61) N, PEEK 802.23 (±111.29) N, Telio CAD-Temp 719.24 (±95.17) N, and Protemp™4 416.40 (±69.14) N. One-way ANOVA test showed a statistically significant difference for marginal gap, internal gap, and fracture strength between all groups (p<0.001). However, the mode of fracture showed no differences between the groups (p>0.05). CAD/CAM fabricated provisional crowns demonstrated superior fit and better strength than direct provisional crowns.