Effects of three surface roughening treatments on adhesion and flexural strength of zirconia ceramics: which one is better?

doi:10.3969/j.issn.2095-4344.0937

Abstract

Abstract:

BACKGROUND: The surface roughening technology of zirconia ceramics is currently a hot spot in dental restoration research. Commonly used surface roughening methods mainly include mechanical treatment and strong acid corrosion, both of which are highly destructive. Previous studies on surface roughening often ignore its influence on the flexural strength of zirconia that has good mechanical properties.

OBJECTIVE: To investigate the effects of three different surface roughening methods on the flexural strength and shear bond strength of zirconia, thereby seeking a roughening method that effectively increase the shear bond strength but produce little effect on the flexural strength of zirconia.

METHODS: Two classes of zirconia specimens, class I (15 mm×3 mm×1 mm, n=40) and class II (3 mm×3 mm×3 mm, n=40), were prepared. Class I specimens were randomly divided into four groups (n=10 per group): blank control, sandblasting with 110 μm Al₂O₃ particles, Er:YAG laser treatment, and hot-etching. Class I specimens were used for three-point bending test to detect the flexural strength of zirconia. Class II specimens received the same treatments with class I, and then bonded to the isolated teeth (treatment agent: Monobond N; adhesive agent: PULPDENT embrace resin cement). Then, these specimens were stored in distilled water at 37 ^oC for 24 hours, and the shear bond strength was measured.

RESULTS AND CONCLUSION: (1) The mean flexural strength of class I specimens was 939.86 MPa in blank control group, 841.38 MPa in sandblasting group, 739.32 MPa in Er:YAG laser and 746.82 MPa in hot-etching group. There was no statistically significant difference between Er:YAG laser group and hot-etching group (P > 0.05), but the difference between other groups was statistically significant (P < 0.05). (2) The mean shear bond strength of class II specimens was (7.00±0.67) MPa in blank control group, (11.73±1.31) MPa in sandblasting group, (8.75±0.92) MPa in Er:YAG laser group and (12.05±1.05) MPa in hot-etching group. There was no statistically significant difference between Er:YAG laser group and hot-etching group (P > 0.05), but the difference between other groups were statistically significant (P < 0.05). (3) Under the scanning electron microscope, the specimen surface was smooth and flat in the blank control group. Obvious hollows were formed on the surface in the sandblasting group, mostly of which were strip-shaped, and a few of which were round-shaped. Etched lines and dot-like pits formed made the zirconia surface rough and uneven in the Er:YAG laser group. A three-dimensional network structure of the zirconia block with intergranular porosity was observed in the hot-etching group. (4) The volume percent of the monoclinic phase crystal form on the specimen surface was 0.91% in the blank control group, 12.50% in the sandblasting group, 6.64% in the Er:YAG laser group, and 17.81% in the hot-etching group. To conclude, the three kinds of surface roughening treatments could improve the shear bond strength of zirconia to resin cement and reduce the flexural strength. Considering synthetically, 110 μm alumina blasting is an ideal roughening treatment by synthetically considering operating convenience, flexural strength and shear bond strength.

中国组织工程研究杂志出版内容重点：生物材料；骨生物材料; 口腔生物材料; 纳米材料; 缓释材料; 材料相容性；组织工程

Key words: Dental Materials, Zirconium, Shear Strength, Biomechanics, Tissue Engineering

CLC Number:

R318

Wang Ji-de, Deng Jiu-peng, Shen Bao-lian, Ma Li-juan. Effects of three surface roughening treatments on adhesion and flexural strength of zirconia ceramics: which one is better?[J]. Chinese Journal of Tissue Engineering Research, 2018, 22(26): 4196-4201.

Figures/Tables 5

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