Effect of Air-Particle-Abrasion Protocols on Surface Roughness and Early Biofilm Formation of Zirconia

Author(s)

Macedo, Vanessa Cruz ^[1] ; Pereira, Priscilla Cristoforides ^[2] ; Cavalvanti de Queiroz, Jose Renato ^[3] ; de Oliveira Dal Piva, Amanda Maria ^[2] ; Duarte Moura, Dayanne Monielle ^[4] ; Tango, Rubens Nisie ^[2] ; Bottino, Marco Antonio ^[2] ; de Assuncao e Souza, Rodrigo Othavio ^[5]

Affiliation

^[1] Univ Braz Cubas, Dept Dent, Mogi Das Cruzes, SP - Brazil

^[2] Sao Paulo State Univ, Inst Sci & Technol, Dept Dent Mat & Prosthodont, UNESP, Sao Jose Dos Campos, SP - Brazil

^[3] UnP Laureate Univ, Dept Biotechnol, Natal, RN - Brazil

^[4] Fed Univ Rio Grande Norte UFRN, Dept Dent, Natal, RN - Brazil

^[5] Fed Univ Rio Grande Norte UFRN, Dept Dent, Prosthodont Div, Natal, RN - Brazil

• Document type: Journal article
• Source: ORAL HEALTH & PREVENTIVE DENTISTRY; v. 18, n. 2, p. 153-159, MAR-APR 2020.
• Web of Science Citations: 0

Abstract

Purpose: The air-particle-abrasion on zirconia in the gingival area of connectors and pontics in fixed partial dentures appears to increase fracture resistance. This study evaluated `in situ' biofilm formation on the zirconia surface after different air-particle-abrasion protocols. Materials and Methods: Ninety sintered blocks (5 x 5 x 2 mm) of yttrium partially stabilised zirconia (Y-TZP) were obtained and randomised among nine groups according to the factors `type of particle' (Alumina 50 and 110 mu m; Cojet and Rocatec) and `pressure' (2.5 and 3.5 bar) used for sandblasting for 10 s. The surface roughness (Ra/ Rz) was measured before and after sandblasting. For the in-situ analyses, custom-made removable intraoral devices n = 10 with one sample of each group attached to the buccal area were used by volunteers for 8 h at night. The specimens were analysed under confocal microscopy to quantify both biovolume and thickness of the initial biofilm formed. One-way analysis of variance (ANOVA) and Dunnett's tests were performed (5%). Results: The roughness values ranged from 0.05 to 0.39 mu m for Ra and from 0.35 to 2.11 mu m for Rz, p = 0.00. Mean biofilm thickness ranged from 0.06 and 0.54 mu m (p = 0.005), while the biovolume values were between 0.02 and 0.61 mu m(3)/mu m(2) (p = 0.002). Values statistically significant for biofilm thickness and biovolume were found in groups sandblasted with Rocatec using 3.5 bar. Conclusion: In order to increase the fracture resistance of zirconia fixed partial dentures (FPDs), the air particle abrasion of zirconia with SiO2 (110 mu m/3.5 bar), in the gingival area of connectors and pontics, should be avoided. (AU)