Objectives: the use of titanium alloy for removable partial dentures is an increasingly application. Polishing titanium is essential to reduce plaque accumulation. The purpose of this in vitro study was to evaluate the surface roughness of commercially pure titanium grade I (RI) and grade IV (RIV) Rematitan (Dentaurum), commercially pure titanium grade I (TI) Tritan (Dentaurum), Co-Cr alloy (RGM) Remanium GM800 (Dentaurum) and gold alloy (GN) Ney cb (Dentaurum). Methods: sixteen specimens of each material were treated with sandblasting, mechanical polishing and magnetic finishing method (Ecoclean, Schutz-Dental) and surface roughness (Ra) was quantitatively measured using a profilometer (Hommer-tester T2000, Hommelwerke). Results: Means and standard deviations of Ra are listed. ANOVA and Newman-Keuls tests showed significant differences (p<0.05) for comparisons between TI>RIV>RI and RGM>GN for mechanical polishing; however, after magnetic finishing method only TI (p<0.05) showed significant difference between tested materials.

	No treated	Sand-blasted	Mechanical	Magnetic
RI	5,5 (1,12)	2,83 (0,32)	0,5 (0,07)	0,32 (0,12)
RIV	5,3 (0,58)	2,01 (0,33)	0,58 (0,29)	0,37 (0,10)
TI	6,13 (1,37)	2,52 (0,36)	0,73 (0,27)	0,62 (0,24)
RGM	7,67 (1,02)	1,6 (0,26)	0,36 (0,07)	0,3 (0,05)
GN	3,76 (1,41)	2,85 (0,50)	0,35 (0,09)	0,3 (0,10)

Conclusion: Surface roughness of Co-Cr and gold alloys is better than titanium in mechanical finishing, whereas all materials have similar behavior with magnetic finishing method. Results suggest that magnetic finishing sequence is suitable for titanium removable partial dentures. Supported in part by Dentaurum, Italy.

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