Effect of Selective Laser Melting Pure Titanium on Bond Strength of Titanium to Composite Resin by Different Surface Treatments

doi:10.13701/j.cnki.kqyxyj.2023.05.010

Abstract

Abstract: Objective: To study the effectiveness of different surface treatments such as sandblasting and/or acid etching on the bond strength of selective laser melting pure titanium to composite resin. Methods: According to the ISO10477 standard, ninety-six selective laser melting pure titanium specimens were randomly divided into 4 groups and treated as follows: Group A1: grinding; Group B1: Sandblasting; Group C1: 4% hydrofluoric acid etching (HF); Group D1: 4% HF acid etching after sandblasting (n=24). Ninety-six forged titanium specimens from different processing technique were taken as the control groups, and the same surface treatments were done and recorded as A2, B2, C2, and D2 (n=24). After the surface treatments, a laser scanning confocal microscope was used to observe the surface morphology and roughness, the bond strength tests were carried out before and after the thermal cycles, and the mode of failures were observed by a stereo microscope. Results: The grinding group has the lowest roughness and the roughness of 4% HF acid etching after sandblasting was lower than that of sandblasting group (P<0.05). The bond strength of 4% HF acid etching after sandblasting group was about 4 times higher than that of grinding group (P<0.05), and the bond strength of the selective laser melting pure titanium specimens were (19.68±2.87) mPa and forged titanium specimens were (17.20±2.60) mPa. The bond strength between titanium and composite resin did not decrease significantly before and after the thermal cycling (P>0.05), and the durability was good. The fracture mode was mainly mixed fracture. Conclusion: Acid etching after sandblasting can effectively improve the strength of titanium to composite resin, which is one of the ideal methods for surface modification of selective laser melting titanium. It can significantly improve the bonding strength with composite resin and have good durability and can prolong the service life of the restoration to a certain extent at the same time. Selective laser melting titanium is a promising processing technology that can replace the traditional production of titanium for clinical applications.

Key words: selective laser melting, titanium, surface treatment, composite resin, bond strength, durability

REN Canxia, HU Dandan, SAIMI·Ayiseng, QIN Yao, LUO Xiaoping. Effect of Selective Laser Melting Pure Titanium on Bond Strength of Titanium to Composite Resin by Different Surface Treatments[J]. Journal of Oral Science Research, 2023, 39(5): 429-434.

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