Fatigue resistance of monolithic lithium disilicate occlusal veneers: a pilot study
| Autor: | Enrico Onofri, Renata Garcia Fonseca, Carlo Monaco, Leonardo Ciocca, Paolo Baldissara |
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| Přispěvatelé: | Baldissara P., Monaco C., Onofri E., Fonseca R.G., Ciocca L., University of Bologna, Universidade Estadual Paulista (Unesp) |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Dental Stress Analysis
Molar Ceramics Survival rate Materials science Dental ceramic medicine.medical_treatment Dental Stress Analysi Dentistry Pilot Projects 030207 dermatology & venereal diseases 03 medical and health sciences 0302 clinical medicine Stereo microscope Fatigue cycling Materials Testing medicine Humans Pilot Project Ceramic Dental Restoration Failure General Dentistry Ball mill Lithium disilicate Vertical dimension of occlusion business.industry 030206 dentistry Dental Porcelain Dental ceramics Tooth wear Occlusal veneers visual_art visual_art.visual_art_medium Veneer Occlusal veneer business Human |
| Zdroj: | Scopus Repositório Institucional da UNESP Universidade Estadual Paulista (UNESP) instacron:UNESP |
| Popis: | Made available in DSpace on 2019-10-06T16:20:30Z (GMT). No. of bitstreams: 0 Previous issue date: 2019-01-01 The use of thin lithium disilicate (LD) occlusal veneers is an effective method to increase the vertical dimension of occlusion in cases of tooth wear. However, doubt remains regarding the threshold thickness to be used in this restoration class. This study aims to evaluate the effect of ceramic thickness on the survival rate and failure pattern of LD molar veneer restorations using a simplified fatigue testing machine. Sixty sound, freshly extracted human molars were used. Three groups (n = 20) were randomly created with different ceramic thicknesses (0.5, 0.8, and 1.2 mm), and 60 LD IPS e.max Press LT occlusal veneers were fabricated. The ceramic restorations were luted with a resin cement. The stainless-steel rotating drum of the ball mill contained 10 zirconia (Y-TZP) and 10 stainless steel spheres, in 500 mL of distilled water at 37 ± 1 °C. Crack growth in the LD restorations was evaluated under a stereomicroscope following each fatigue testing run (12 60-min runs). Progressive damage was observed as a function of cycling time. Survival was significantly influenced by the restoration thickness (p = 0.002, log-rank test), with thicker restorations exhibiting a higher survival rate. Thinner restorations (0.5 mm) showed significantly lower survival rate than 0.8- and 1.2-mm restorations (p < 0.016); no significant difference was observed between the 0.8- and 1.2-mm restorations. A threshold value of 0.8 mm may represent an acceptable compromise between fatigue resistance and tooth reduction. Department of Biomedical and Neuromotor Science Division of Prosthodontics Alma Mater Studiorum University of Bologna Department of Biomedical and Neuromotor Sciences Division of Prosthodontics Alma Mater Studiorum University of Bologna Dental School Alma Mater Studiorum University of Bologna Department of Dental Materials and Prosthodontics Araraquara Dental School Unesp-Univ Estadual Paulista Araraquara Department of Dental Materials and Prosthodontics Araraquara Dental School Unesp-Univ Estadual Paulista Araraquara |
| Databáze: | OpenAIRE |
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