Abstract
Objectives: To investigate the effect of the thermal treatment on the bending strength of ceramic bars (VM7) treated by the cementation protocol. Material and Methods: Forty ceramic bars (20 x 4 x 1.2 mm) were constructed and randomly distributed into 2 groups (n=20): NT - without treatment/control and T – with treatment (50°C above the glass transition temperature, for 15 min). All specimens underwent the cementation process in which one surface of the ceramic bar was etched (20 s) with 10% hydrofluoridric acid, followed by air-water jet washing (60 s), drying (30 s), silane agent application and resin cementation. After storage (distilled water/seven days at 37 ºC), the specimens were submitted to 3-point flexure test at 100% humidity/37 ºC (v=1 mm/min, load cell of 10 kgf). Results: The bending strength values and standard deviations (MPa) were: NT: 19.98 (3.17)a; T: 20.45 (4.67)a (one-way ANOVA and Tukey test, ?=0.05). Conclusions: The thermal treatment did not influence on the bending strength mean values of the ceramics studied.
Highlights
Dental ceramics show as main advantages the friable behavior and the low fracture strength [1]
Considering the hypotheses that the thermal treatment would or would not exhibit statistical differences, the aim of this study was to investigate its effect on the bending strength of double-layer bars of ceramic/resin cement
All specimens were submitted to finishing procedure with the aid of 1200-grit sandpapes [4] followed by sonic cleaning (Vitasonic, VITA Zahnfabrik, Bad Säckingen, Germany) with deionized water for 5 minutes
Summary
Dental ceramics show as main advantages the friable behavior and the low fracture strength [1]. One alternative that has been suggested to increase the ceramic resistance is the thermal treatment (annealing). There is a lack of information on the effect of the thermal treatment on the resistance of dental ceramics.
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