https://doi.org/10.23805/JO.2022.14.3
Influence of sintering technique on fracture load of monolithic zirconia with different thicknesses
Accepted: 11 October 2021
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Aim This work aims to investigate and measure different fracture loads produced by two different sintering procedures (high-speed and traditional sintering) on different thicknesses of zirconia crowns.
Materials and methods Zirconia blanks (Vita/zahnfabrik diameter 98 mm x 12 mm height, Germany) were used to fabricate 48 molar crowns (N = 48, divided into 2 groups of 24) which were constructed in three different occlusal thicknesses (1.5, 2.0, 2.5 mm) using two methods: conventional sintering (1,450°C) and high-speed sintering (1,550°C). Crowns were bonded to CoCr die. Fracture load was tested after all crowns were underwent 5,000 timesthermocycling test (between 5°C and 55°C).
Result ANOVA analysis has been used to compare the fracture load of different groups, and results showed that high-speed sintering required significantly more force and load than conventional sintering (p-values 0.001).
Conclusion Time and money-saving technology showedencouraging results that with zirconia crowns resulted in high-speed sintering and greater fracture loading values than the control group (conventional technique); also, fracture load increased with increase of thickness of zirconia crown. Therefore, it is recommended to increase occlusal thickness with high-speed sintering to obtain better resistance to chewing force.
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