European Journal of Prosthodontics and Restorative Dentistry

Accuracy of Intraoral Scanners: A Systematic Review of Influencing Factors


To evaluate fracture resistance of occlusal veneers made of glass-ceramic and zirconia with and without fatigue. Occlusal overlays (N=80; n=10 per group) were milled out of CAD/CAM materials, namely: a)LD:Lithium disilicate glass ceramic, b)LDS:Lithium-disilicate-strengthened aluminosilicate glass ceramic, c)ZLT:Zirconium dioxide ceramic and d)ZMT:Zirconium dioxide ceramic. The overlays were cemented on polymeric duplicates, randomly distributed to aging or non-aging conditions and loaded until fracture. Ultimate catastrophic failure strength(Fmax) and Initial crack formation load(Finitial) values were analysed using two-way ANOVA. For Finitial, material type and aging and their interaction resulted in significant values (p =<0.001). Finitial mean±SD values ranged from ZMTa (593 N ±205 N) to LDSb (118 N ±42 N). As for Fmax, the material type significantly affected the outcome (p<0.001), while aging type did not show an influence (p=0.795). The non-aged Fmax specimens values presented were: LDSa (877 N ±253 N)<LDa (2029 N ±412 N)<ZLTa (2049 N ±379 N)<ZMTa (2144 N ±333 N), LDSa being significantly lower (p<0.001). The aged Fmax values were: LDSb (1313 N ±599 N)< ZLTb (1715 N ±453 N)<ZMTb (2018 N ±300 N)<LDb (2134 N ±289 N). LDS yielded significantly lower Fmax values without and non-significant less favourable results with aging. The mechanical properties following aging and lack of additional firing makes LDS an interesting restorative material for clinical application.
Lithium Disilicate
Fracture Resistance
Mechanical Loading
Occlusal Veneers


Dr. Jaafar Abduo, Dr. Mohamed Elseyoufi

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