Ziad N Al-Dwairi1, Kawkab Y Tahboub1, Nadim Z Baba2, Charles J Goodacre2, Mutlu Özcan3. 1. Department of Prosthodontics, Faculty of Dentistry, Jordan University of Science and Technology (JUST), Irbid, Jordan. 2. Advanced Specialty Education Program in Prosthodontics, Loma Linda University, School of Dentistry, Loma Linda, CA. 3. University of Zurich, Head of Dental Materials Unit, Center for Dental and Oral Medicine, Clinic for Fixed and Removable Prosthodontics and Dental Materials Science, Zurich, Switzerland.
Abstract
PURPOSE: To compare surface properties of 2 brands of pre-polymerized resin blocks for complete dentures (CAD/CAM PMMA) to conventional heat-polymerized PMMA. MATERIALS AND METHODS: A total of 45 rectangular specimens (25 × 25 × 3 mm) were fabricated from 3 brands of PMMA (n = 15/group): AvaDent CAD/CAM PMMA, Tizian-Schütz CAD/CAM PMMA, Meliodent conventional PMMA. Specimens were examined for wettability using the sessile drop method, surface roughness using a digital contact profilometer, and microhardness using Vickers hardness number. Statistical analysis was performed using one-way ANOVA and Tukey pairwise multiple comparisons. p-Values of ≤0.05 were considered significant. RESULTS: AvaDent specimens demonstrated the highest mean contact angle (72.87 ± 48°) and the highest mean Vickers hardness number (20.62 ± 0.33). The conventional heat-polymerized specimens showed the highest mean surface roughness (0.22 ± 0.071 μm). Tizian-Schütz specimens showed the lowest mean surface roughness (0.12 ± 0.02 μm). CONCLUSIONS: As CAD/CAM PMMA groups exhibited significantly more favorable surface properties in comparison to the conventional heat-polymerized groups, CAD/CAM dentures are expected to be more durable. Different brands of CAD/CAM PMMA may have inherent variations in surface properties.
PURPOSE: To compare surface properties of 2 brands of pre-polymerized resin blocks for complete dentures (CAD/CAMPMMA) to conventional heat-polymerized PMMA. MATERIALS AND METHODS: A total of 45 rectangular specimens (25 × 25 × 3 mm) were fabricated from 3 brands of PMMA (n = 15/group): AvaDent CAD/CAMPMMA, Tizian-Schütz CAD/CAMPMMA, Meliodent conventional PMMA. Specimens were examined for wettability using the sessile drop method, surface roughness using a digital contact profilometer, and microhardness using Vickers hardness number. Statistical analysis was performed using one-way ANOVA and Tukey pairwise multiple comparisons. p-Values of ≤0.05 were considered significant. RESULTS: AvaDent specimens demonstrated the highest mean contact angle (72.87 ± 48°) and the highest mean Vickers hardness number (20.62 ± 0.33). The conventional heat-polymerized specimens showed the highest mean surface roughness (0.22 ± 0.071 μm). Tizian-Schütz specimens showed the lowest mean surface roughness (0.12 ± 0.02 μm). CONCLUSIONS: As CAD/CAMPMMA groups exhibited significantly more favorable surface properties in comparison to the conventional heat-polymerized groups, CAD/CAM dentures are expected to be more durable. Different brands of CAD/CAMPMMA may have inherent variations in surface properties.
Authors: Mohammed M Gad; Saleh Z Alshehri; Shahad A Alhamid; Alanoud Albarrak; Soban Q Khan; Faris A Alshahrani; Firas K Alqarawi Journal: Dent J (Basel) Date: 2022-03-09