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EFFECT OF SURFACE ROUGHNESS ON BOND STRENGTH IN TITANIUM-PORCELAIN SYSTEM  

Kim, Sang-Hun (Department of Prosthodontics, College of Dentistry, Chonnam University)
Vang, Mong-Sook (Department of Prosthodontics, College of Dentistry, Chonnam University)
Yang, Hong-So (Department of Prosthodontics, College of Dentistry, Chonnam University)
Park, Sang-Won (Department of Prosthodontics, College of Dentistry, Chonnam University)
Park, Ha-Ok (Department of Prosthodontics, College of Dentistry, Chonnam University)
Lim, Hyun-Pil (Department of Prosthodontics, College of Dentistry, Chonnam University)
Oh, Gye-Jeong (Department of Prosthodontics, College of Dentistry, Chonnam University)
Publication Information
The Journal of Korean Academy of Prosthodontics / v.45, no.2, 2007 , pp. 182-190 More about this Journal
Abstract
Statement of problem: Titanium has many advantages of high biocompatibility, physical properties, low-weight, low price and radiolucency, but it is incompatible with conventional dental porcelain due to titanium's oxidative nature. Many previous studies have shown that they used the method of sandblast for surface treatment prior to porcelain application, the researches are processing about the method of acid etching or surface coating. Purpose: The purpose of this research is to study the effect on bond strength of surface roughness between titanium and porcelain with the same surface topography. Material and method: In this study, we evaluated the bond strength by using 3-point bending test based on ISO 9693 after classified 8 groups - group P : polished with #1200 grit SiC paper, group S10 : $1.0{\mu}m$ surface roughness with sandblasting, group S15 : $1.5{\mu}m$ surface roughness with sandblasting, group S20 : $2.0{\mu}m$ surface roughness with sandblasting, group S25 : $2.5{\mu}m$ surface roughness with sandblasting, group S30 : $3.0{\mu}m$ surface roughness with sandblasting, group S35 : $3.5{\mu}m$ surface roughness with sandblasting, group E : $1.0{\mu}m$ surface roughness with HCl etching. Results: Within the confines of our research, the following results can be deduced. 1. In the results of 3-point bending test, the bond strength of sandblasting group showed significant differences from one of polishing group, acid etching group(P<.05). 2. The bond strength of sandblasting groups did not show significant differences. 3. After surface treatments, the group treated with sandblasting showed irregular aspect formed many undercuts, in the SEM photographs. The bond strength of sandblasting group was higher than 25 MPa, the requirement of ISO 9693. Conclusion: In above results, bond strength of titanium and low-fusing porcelain is influenced more to surface aspect than surface roughness. And titanium has clinically acceptable bond strength below surface roughness of $3.5{\mu}m$.
Keywords
Titanium-Porcelain System; Surface Roughness; Bond Strength;
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