[Analysis of retention of 3 different aesthetic Co-Cr-Mo alloy clasps on premolars].
OBJECTIVE
To evaluate the 3-D surface topography of ultrasonically prepared tooth.


METHODS
Ten extracted human maxillary premolars were prepared for crowns. A split-tooth model was used to refine the margins: half of the margin was finished with traditional rotary instruments, the other with ultrasonic instruments. The 3-D profiles of the prepared surface were observed under scanning electron microscopy and Talysurf CCI 3000 non-contact 3D profiler, and a quantitative comparison of 3-D surface roughness average(SA) and the surface of skewness(SSK) was conducted with Talymap Gold software. The data were analyzed by independent sample t test using SPSS13.0 software package.


RESULTS
The surface finished with ultrasonic instruments exhibited a smoother surface. 3-D surface roughness analysis showed that the SA and SSK of surfaces made by ultrasonic instruments were significantly lower, compared with surfaces produced using conventional rotary instruments.


CONCLUSIONS
The ultrasonic instruments produce surface in better condition than the conventional rotary instruments.
Hefei Stomatological Hospital. Hefei 230001, Anhui Province, China. E-mail:hyfedward@163.com.
Yong-Fu
YF
Hou
Hua-Qin
HQ
Bian
Lei
L
Zhang
Zhen
Z
Sun
D000497:Alloys; D001641:Bicuspid; D003442:Crowns; D016734:Dental Clasps; D004954:Esthetics; D006801:Humans; D008855:Microscopy, Electron, Scanning; D013499:Surface Properties; D019246:Tooth Preparation; D014800:Vitallium / Q000737:chemistry*
D000497:Alloys; D014800:Vitallium