A Novel Polishing Paste (Mollusk Shells) for Poly (Methylmethacrylate)

Table 1

In vitro evaluation of the surface roughness of the experimental mollusk shell paste versus pumice.

Paste	Initial		24 hours				Mean difference
	Mean ± SD (μm)	Median (μm)	Mean ± SD (μm)	Median (μm)		^‡	Mean ± SD (μm)	Median (μm)	^†
Mollusk shell paste	0.56 ± 0.07	0.54	0.09 ± 0.03	0.08	<0.05	<0.001	0.50 ± 0.07	0.43	0.309
Pumice	0.61 ± 0.11	0.58	0.16 ± 0.06	0.15	<0.05	<0.001	0.45 ± 0.12	0.46

Normality test (Shapiro–Wilk, ). ^‡Paired Wilcoxon test. ^†Mann–Whitney U test. Significance level, .