IADR Abstract Archives

Effect of Prophylactic Pastes on Surface Gloss of Ceramics

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.
IADR/PER General Session
2018 IADR/PER General Session (London, England)
London, England
2018
0105
Dental Materials 7: Color and Appearance (Esthetics)
  • Alsharari, Thani  ( Nova Southeastern University , Ft. Lauderdale , Florida , United States )
  • Garashi, Mehdi  ( Kuwait Ministry of Health , Hollywood , Florida , United States )
  • Hardigan, Patrick  ( Nova Southeastern University , Ft. Lauderdale , Florida , United States )
  • Antonson, Sibel  ( Nova Southeastern University , Ft. Lauderdale , Florida , United States )
  • NONE
    Oral Session
    Color and Appearance (Esthetics) I
    Wednesday, 07/25/2018 , 09:30AM - 11:00AM
    Table 1
    SubstrateProphylactic PasteMean Gloss DifferenceSignificance
    EPF-0.8a
    FPPF-1.25a
    FPNF-1.39a
    LiSi2PF-1.74a
    LiSi2NF-2.08a
    FPPC-2.21a
    ENF-2.63ab
    FPNC-3.29ab
    LiSi2PC-3.41ab
    EPC-3.83ab
    ENC-4.43ab
    LiSi2NC-6.23b
    Groups not connected by the same letter are significantly different