00000ctm a22000003a 4500 UP-1685523046125456174 Buklod 20080307102846.0 m |o d | cr ||||||||||| 080307s xx d r |||| u| (iLib)UPMNL-00001786218 UPDent eng LG 993.5 1999 D4 M47 Mendoza, Christine Joyce C. Effects of planar and rotary motions on the surface roughness of hybrid composite resins Christine Joyce C. Mendoza. 42 leaves Seminar Paper--Doctor of Dental Medicine--University of the Philippines Manila. Various studies have been undertaken to determine the most effective methods in finishing and polishing composite resin restorations. Even if the sizes of the abrasive grits of the finishing material remain the most important factor in achieving optimal surface smoothness, the motion to which the finishing material is applied is equally critical. The study aimed to determine the finishing motion/s that produce/s the lowest surface roughness value of hybrid composite resins, as compared with a surface that was polymerized in contact with a Mylar strip. An experimental-analytic study was conducted Four motions were compared, namely: rotary, planar, planar-rotary, rotary-planar. Two resin blocks were finished for each type of motion and then viewed under a Scanning Electron Microscope(SEM). Photomicrographs were taken and the surface irregularities over an area of four inches were measured. The data gathered was analyzed by a one-way AN OVA test. Among the four motions, the rotary and rotary-planar motions produced the lowest surface roughness value which is equal to that produced by the control. The difference was statistically significant (p < 0.05). Atienza, Angelina A. (Adviser). UPMNL DENT LG 993.5 1999 D4 M47 Thesis