Isil Gürdal1, Ayse Atay2, Marlis Eichberger3, Ebru Cal4, Aslihan Üsümez5, Bogna Stawarczyk6. 1. Postgraduate student, Department of Prosthodontics, Faculty of Dentistry, Bezmialem Vakif University, Istanbul, Turkey. Electronic address: isilgurdal@gmail.com. 2. Assistant Professor, Department of Prosthodontics, Faculty of Dentistry, Altinbas University, Istanbul, Turkey. 3. Dental Technician, Department of Prosthodontics, Dental School, Ludwig Maximilian University, Munich, Germany. 4. Professor, Department of Prosthodontics, Dental School, Ege University, Izmir, Turkey. 5. Professor, Dental Plus Clinic, Istanbul, Turkey. 6. Head, Dental Materials Unit, Department of Prosthodontics, Dental School, Ludwig Maximilian University, Munich, Germany.
Abstract
STATEMENT OF PROBLEM: The color of resin cements and computer-aided-design and computer-aided-manufacturing (CAD-CAM) restorations may change with aging. PURPOSE: The purpose of this in vitro study was to analyze the influence of thermocycling on the color of CAD-CAM materials with underlying resin cement. MATERIAL AND METHODS: Seven different CAD-CAM materials, composite resins and glass-ceramics were cut into 0.7-mm and 1.2-mm thicknesses (n=10) and cemented with a dual-polymerizing resin cement, a light-polymerizing resin cement, and a preheated composite resin (N=420). Color values were measured by using spectrophotometry. Specimens were subjected to thermocycling (5°C and 55°C; 5000 cycles). The measured color difference (ΔE) data were analyzed by using descriptive statistics. Normality of data distribution was tested by using the Kolmogorov-Smirnov test. Three-way and 1-way ANOVA followed by the Scheffé post hoc test and unpaired 2-sample Student t test were computed to determine the significant differences among the tested parameters (α=.05). RESULTS: ΔE values were significantly influenced by the CAD-CAM material (ηp2=0.85, P<.001) and the resin composite cement (ηP2=0.03, P=.003) but were not influenced by thickness (P=.179). Significant interactions were present among thickness, cement, and CAD-CAM materials (P<.001). Vita Suprinity and GC Cerasmart showed significantly the lowest ΔE values (P<.001). The highest ΔE values were observed for IPS Empress CAD. The dual-polymerizing resin cement showed significantly lower ΔE values than the preheated composite resin (P=.003). CONCLUSIONS: Restoration materials and composite resin cement types used for cementation influence the amount of color change due to aging.
STATEMENT OF PROBLEM: The color of resin cements and computer-aided-design and computer-aided-manufacturing (CAD-CAM) restorations may change with aging. PURPOSE: The purpose of this in vitro study was to analyze the influence of thermocycling on the color of CAD-CAM materials with underlying resin cement. MATERIAL AND METHODS: Seven different CAD-CAM materials, composite resins and glass-ceramics were cut into 0.7-mm and 1.2-mm thicknesses (n=10) and cemented with a dual-polymerizing resin cement, a light-polymerizing resin cement, and a preheated composite resin (N=420). Color values were measured by using spectrophotometry. Specimens were subjected to thermocycling (5°C and 55°C; 5000 cycles). The measured color difference (ΔE) data were analyzed by using descriptive statistics. Normality of data distribution was tested by using the Kolmogorov-Smirnov test. Three-way and 1-way ANOVA followed by the Scheffé post hoc test and unpaired 2-sample Student t test were computed to determine the significant differences among the tested parameters (α=.05). RESULTS: ΔE values were significantly influenced by the CAD-CAM material (ηp2=0.85, P<.001) and the resin composite cement (ηP2=0.03, P=.003) but were not influenced by thickness (P=.179). Significant interactions were present among thickness, cement, and CAD-CAM materials (P<.001). Vita Suprinity and GC Cerasmart showed significantly the lowest ΔE values (P<.001). The highest ΔE values were observed for IPS Empress CAD. The dual-polymerizing resin cement showed significantly lower ΔE values than the preheated composite resin (P=.003). CONCLUSIONS: Restoration materials and composite resin cement types used for cementation influence the amount of color change due to aging.
Authors: Ahmad M Al-Thobity; Abdulkareem M AlOtaibi; Abdulrahman E Alhumaidan; Ahmed A Aldossary; Intisar Ahmad Siddiqui; Mohamed Ahmed Helal; Abdulmohsen Alsalman Journal: Saudi Dent J Date: 2022-08-11