二氧化锆与钴铬合金修复体精细抛光后对天然牙磨耗的影响

Abstract

Abstract: Objective　To investigate the effect of fine polishing on the abrasion between natural tooth and zirconia, or cobalt-chromium alloy. Methods　The surface roughness value was measured to analyze surface roughness of zirconia, glazed-zirconia and cobalt-chromium alloy before and after fine polishing. The friction coefficient between restoration materials and natural enamel was measured, friction and wear experiment was carried out between natural tooth and three kinds of materials under presupposed condition, which simulated oral chemistry environment by artificial saliva and mechanical property by wear and abrasion test machine. Every sample was weighed pretest-posttest to calculate volume loss. Scanning electron microscopy was used to analyze surface characteristic of post-experiment natural tooth. Results　The roughness value of polished zirconia group(0.933±0.1862)μm was significantly smaller than ziconia group(2.350±0.327)μm without polishing(P=0.000).Polished glazed-zirconia group (2.300±0.8718)μm and glazed-zirconia group(4.200±0.1897)μm, polished cobalt-chromium ally group (0.250±0.083)μm and cobalt-chromium ally group (1.200±0.894)μm had the same result(P=0.000).The volume loss of natural tooth for polished zirconia group(6.067±0.9212)mg was significantly smaller than zirconia group(16.690±2.113)mg without polishing(P=0.001).Polished glazed-zirconia group(5.893±0.838)mg and glazed-zirconia group(14.016±0.063)mg(P=0.000), polished cobalt-chromium ally group(4.573 ±1.954)mg and cobalt-chromium group(11.433±1.087)mg(P=0.008) had the same result. The volume loss of restoration for polished zirconia group(0.300±0.010)mg was significantly smaller than zirconia group(0.800±0.010)mg without polishing(P=0.001).Polished glazed-zirconia group(0.456±0.055)mg and glazed-zirconia group(0.650±0.086)mg(P=0.031), polished cobalt-chromium ally group(10.236 ±0.357)mg and cobalt-chromium group(14.300±0.526)mg(P=0.000) had the same result. The friction coefficient between polished zirconia and natural tooth(0.068) was significantly smaller than that between zirconia and natural tooth(0.096)(P=0.001).Glazed-zirconia and cobalt-chromium ally had the same result(P=0.001). Conclusions　Fine polishing significantly reduce the roughness of restoration surface and the friction coefficient between restoration and natural tooth, so it can avoid severe tooth wear.

Key words: polishing, abrasion and wear, natural tooth, Zirconia, CoCr alloy

CLC Number:

R783.2

References

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Effect of polishing on the abrasion between zirconia or cobalt-chromium alloy restoration and natural tooth

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