[Strength of bi-layer dental ceramic evaluated by MSP testing]

Area of Science:

• Materials Science
• Biomaterials Engineering
• Dental Ceramics

Context:

• Dental ceramics are crucial for restorative dentistry, requiring robust mechanical properties.
• Evaluating the strength of layered ceramic structures, like alumina/Y-TZP, is essential for clinical success.
• Traditional mechanical testing methods may not fully represent clinical conditions for dental ceramics.

Purpose:

• To compare the strength of bi-layer alumina/Y-TZP dental ceramics using multi-surface polish (MSP) testing against the 3-point bending test.
• To assess the reliability and feasibility of MSP testing for evaluating mechanical properties of dental ceramics.
• To investigate the failure modes and interface integrity of bi-layer alumina and Y-TZP specimens.

Summary:

• Bi-layer alumina/Y-TZP specimens were tested using MSP and 3-point bending. MSP testing consistently yielded lower strength values than 3-point bending.
• Single-layer Y-TZP exhibited the highest strength, while bi-layer specimens showed reduced strength compared to single-layer Y-TZP.
• Bi-layer alumina specimens displayed delamination and interface destruction, whereas bi-layer Y-TZP specimens maintained interface integrity.

Impact:

• MSP testing is validated as a convenient and feasible method for evaluating the mechanical properties of dental ceramics.
• The findings highlight the superior strength and interface stability of Y-TZP over alumina in bi-layer dental ceramic structures.
• This research informs the selection and design of dental ceramics for improved long-term clinical performance and reliability.