Cracking of Porcelain Surfaces Arising from Abrasive Grinding with a Dental Air Turbine

摘要: Purpose: The purpose of this in vitro study was to evaluate porcelain cracking induced by abrasive grinding with a conventional dental air turbine and diamond burs. Materials Methods: Four commercially available porcelains were examined—Wieland ALLUX, Wieland ZIROX, IPS e.max Ceram, Empress Esthetic Veneering porcelain. Sixty discs each type fabricated according manufacturer instructions, followed an auto-glaze cycle. Abrasive using fine, extra-fine, ultra-fine burs carried out, turbine. parameters standardized regard the magnitude force applied, rotational speed bur, flow rate water coolant. A testing apparatus used control applied during procedure. ground surfaces then examined under scanning electron microscope. Results: Cracking seen for all types when fine bur. not specimens extra-fine or bur. Conclusion: Wet grit has potential cause four tested. Similar smaller size particles does similar observable cracking.