Department of Prosthetic Dentistry, University Hospital, Ludwig-Maximilians-University Munich.
Department of Prosthetic Dentistry, University Hospital Regensburg.
Dent Mater J. 2020 Mar 31;39(2):302-308. doi: 10.4012/dmj.2019-045. Epub 2019 Dec 19.
To test the impact of the pressing furnace on flexural strength and facture toughness of the lithium-disilicate-ceramics HS10PC (HS) and IPS e.max Press (IP). Three hundred and sixty specimens (3×4×30 mm) were pressed (n=180/ceramic) using different pressing furnaces, namely Austromat 654 Press-i-dent (AUS), Programat EP5000 (PRO), and Vario Press 300 (VAR). Three-point flexural strength (n=30) and fracture toughness (n=30) were measured. Flexural strength (336-360 MPa) was not affected by pressing furnace or ceramic and showed comparable values between all groups. Fracture toughness (2.65-2.81 MPa√m) provided higher values for HS pressed using AUS compared to specimens pressed in PRO and VAR. For IP, no impact of the pressing furnace on fracture toughness was found. IP presented higher fracture toughness than HS when pressed using PRO. No correlations were found. Both lithium disilicate ceramics showed comparable flexural strength regardless of the pressing furnace. Fracture toughness depended on the ceramic and on the pressing furnace.
为了测试压力炉对锂硅石陶瓷 HS10PC（HS）和 IPS e.max Press（IP）的弯曲强度和断裂韧性的影响。使用不同的压力炉（n=180/陶瓷）压制了 360 个样本（3×4×30mm），分别为 Austromat 654 Press-i-dent（AUS）、Programat EP5000（PRO）和 Vario Press 300（VAR）。测量了三点弯曲强度（n=30）和断裂韧性（n=30）。弯曲强度（336-360MPa）不受压力炉或陶瓷的影响，所有组之间的数值都相当。断裂韧性（2.65-2.81MPa√m）对于使用 AUS 压制的 HS 提供了比在 PRO 和 VAR 中压制的样本更高的值。对于 IP，没有发现压力炉对断裂韧性有影响。当使用 PRO 压制时，IP 的断裂韧性高于 HS。未发现相关性。两种锂硅石陶瓷的弯曲强度都相当，无论压力炉如何。断裂韧性取决于陶瓷和压力炉。
