Abstract: Objective: To evaluate stripping effect of the flat maxillary sinus floor mucosa with homemade modified nickel titanium four kinds of stripping device when stripping maxillary sinus floor mucosa of the goat in vitro. Methods: On the basis of establishing immediate visual model on the flat maxillary sinus floor mucosa of stripping length, we used four kinds of maxillary sinus stripping device to strip the flat bottom of the maxillary sinus mucosa, which were umbrella stripping device, probe modified stripping device, 012 nickel-titanium stripping device, the 014 nickel-titanium stripping device. Stripping length of the four groups was analyzed by ANOVA and then was compared in two groups with SNK (Student-Newman-Keuls). Results: Difference of stripping length between the four groups was statistically significant (P<0.01). Then compared in two groups with SNK, difference of stripping length of the four groups was statistically significant between the two two groups. Conclusion: Compared with the other three stripping device for the flat maxillary sinus floor, nickel titanium instruments for stripping showed obvious advantages. The length of two nickel titanium instruments were greater than umbrella stripping device and the probe modified stripping device. The effect of the maxillary sinus floor with the 014 nickel titanium was better than that of the 012 nickel titanium stripping apparatus.

Key words: Maxillary sinus, Maxillary sinus floor mucosa , Stripping length , Stripping device