Effects of various clean-up techniques on enamel surface roughness.
- Author:
Sang Wan CHO
1
;
Oh Won KWON
Author Information
1. Department of Orthodontics, College of Dentistry, Kyungpook National University, Korea.
- Publication Type:Original Article
- Keywords:
Enamel;
surface roughness;
round bur;
fissure bur;
pumice
- MeSH:
Bicuspid;
Dental Enamel*;
Rubber
- From:Korean Journal of Orthodontics
1997;27(5):791-800
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
Sixty premolars extracted for orthodontic treatment were divided into four groups, and the residual resin was removed with four different rotary finishing instruments at a fixed speed of 18,500+/-300rpm on the low speed handpiece. The instruments were G1; 169L carbide fissure bur, G2; No.2 round bur, G3; No.4 round bur, G4; No.8 round bur. Then, the enamel received a 5-second polishing with a rubber cup and a pumice. To find the extent of loss on the enamel at this point, prophylaxis was done with the rubber cup and a pumice prior to bonding of the bracket(P1) and removal of residual resin by means of appropriate procedure applicable to each resprctive group(P2) followed. The final polishing was done with the rubber cup and pumice(P3), and the enamel surface roughness was measured each by the surface measuring instrument. The whole process was obesrved under a scanning electron microscope to gain the following results : At P2, the enamel surface roughness in G1 showed most smoothly with 2.60+/-0.55microgram; in G2, 3.24+/-0.80microgram; in G3, 3.44+/-0.94microgram; in G4, 3.89+/-0.54microgram, the rougjest. G2 and G3 showed no statistical significance(P>0.05). At P3, the enamel surface roughness in G1 showed most smoothly with 2.29+/-0.47microgram, in G2, 2.44+/-0.56microgram, in G3, 2.44+/-0.58microgram, in G4, 2.92+/-0.43microgram, the roughwst. G1 vs G2, G3, and G2 vs G3 had no statistical significances(P>0.05). In all groups, P2 and P3 showed rougher in surface roughness than P1, and P2 rougher than P3(P<0.01). In a case of 5-second prophylaxis with the rubber cup and the pumice on a virgin, normal enamel. fine scratches were found under the scanning electron microscope. In all four groups, unremovable gouges remained even agter polishing with the rubber and pumice; residual resin was not observed with naked eye when finished with the rubber and pumice, but the resin debris was observed under the scanning electron microscope.
