Thermal cracks of implant-based zirconia four-unit restorations: A fractographic analysis of two restorations fractured during production
Available online 5 April 2018
Clinical Report
Abstract
Two
zirconia-based 4-unit restorations intended for the same patient
fractured during the veneering process even though the prolonged cooling
protocol recommended by the manufacturers was used. Fractographic
analyses revealed that both restorations fractured as a result of
thermal shock, but at different times during production. Further
investigation is necessary to optimize the firing protocols for large
zirconia-based restorations and avoid fracture due to thermal shock.
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