Influence of microstructure on metal-ceramic bonding in SLM-manufactured titanium alloy crowns and bridges.

Abstract

Objectives: This study focuses on the effect of microstructural surface characteristics on metal-ceramic bond strength for SLM-fabricated titanium alloy. This research seeks to improve metal-ceramic adhesion in SLM-produced parts.

Methods: Inspired by the hydrophilic structure of Calathea zebrina, bioinspired microstructures were designed on titanium alloy surfaces. Samples were categorized into two groups: those with microstructured surfaces and those with smooth surfaces. Various microstructural parameters were implemented. Bending tests were conducted on all samples, which were subjected to the same porcelain-fused-to-metal sintering process. Scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) were employed to examine the bonding and separation surfaces of titanium alloy and porcelain.

Results: Metal-porcelain bonding strength is strongly influenced by the spacing and height of the bionic microstructure. Surfaces with the microstructure showed significantly higher bonding strength and distinctly different residue characteristics after peeling compared to surfaces without the microstructure.

Conclusions: Microstructured surfaces on titanium alloy substrates facilitate robust chemical and mechanical bonding between metal and porcelain, markedly enhancing the performance of SLM-produced metal-ceramic restorations.