Title: 0105 - Effect of Prophylactic Pastes on Surface Gloss of Ceramics


Thani Alsharari, Nova Southeastern University
Mehdi Garashi, Kuwait Ministry of Health
Patrick Hardigan, Nova Southeastern University
Sibel Antonson (Presenter)
Nova Southeastern University


Objectives: To evaluate the effect of prophylactic pastes on the surface gloss of two commonly used ceramic materials and human enamel.

Methods: A total of forty specimens, composed of two types of ceramics, were prepared to test the hypothesis. Twenty specimens were assigned to each ceramic group: lithium disilicate (LiSi2) (e.max CAD MT, A2, IvoclarVivadent) and feldspathic ceramic (FP) (VITABLOCKS Mark II, A2C, Vita). They were prepared by sectioning the CAD/CAM blocks into 2-mm-thick slices (12x14 mm), and finished/polished gradually down to 1,200 grit size. They were ultrasonically cleaned, dried, and glazed using their respective glazes according to manufacturers’ instructions. Four intact human enamel surfaces (E) served as a control group. Baseline surface gloss was measured with a Glossometer (Novo-Curve, Rhopoint Instruments, East Sussex, UK) from 3 spots on each specimen. Five specimens from each group were randomly assigned to one of the four groups of the following prophylactic polishing pastes: Proxyt coarse/fine (PC/PF) (IvoclarVivadent), Nupro coarse/fine (NC/NF) (Dentsply). They were applied to the specimens by a calibrated/blind operator using un-impregnated prophylactic cups according to the manufacturers’ instructions for 40s (10 second intervals) under a constant load of 400gr at 3,000rpm. Surface gloss of the specimens were re-measured. A mixed, general linear model was used for statistics, and significance was accepted at p <0.05. Post-hoc comparisons were conducted using Tukey test.

Results: A significant difference was found between ceramic surfaces [F(2, 32) = 17.71, p = 0.041, η2 = 8%] and prophy pastes [F(3, 32) = 76.37, p < 0.001, η2 = 40%], but no difference between the interaction of material by prophylactic pastes [F(6,32) = 1.04, p = 0.416, η2 = 5%]. Reviewing the effect size estimates (eta-squared) indicates that prophylactic paste had the greatest effect on gloss.

Conclusions: Nupro Coarse reduced gloss significantly on all materials, particularly on LiSi2. Proxyt Fine reduced the least amount of gloss on all surfaces, particularly on enamel.


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Substrate Prophylactic Paste Mean Gloss Difference Significance
E PF -0.8 a
FP PF -1.25 a
FP NF -1.39 a
LiSi2 PF -1.74 a
LiSi2 NF -2.08 a
FP PC -2.21 a
E NF -2.63 ab
FP NC -3.29 ab
LiSi2 PC -3.41 ab
E PC -3.83 ab
E NC -4.43 ab
LiSi2 NC -6.23 b

Disclosure Statement:
The submitter must disclose the names of the organizations with which any author have a relationship, the nature of the relationship, and the clinical or research area involved. The following is submitted: NONE