title: Influence of air abrasion preparation on microleakage in glass ionomer cement restorations.
abstract: The aim of this study was to assess microleakage in class V cavities prepared by air abrasion or high-speed dental bur and restored with different glass ionomer cements. Sixty bovine incisors were equally divided into 6 groups: I, II and III (preparation by high-speed) and IV, V and VI (preparation by air abrasion). Groups I and IV were restored with Fuji IX; groups II and V with Ketac Molar; and groups III and VI with Vitremer. After 24 h (37 degrees C), specimens were thermocycled, isolated with nail varnish, immersed in a 0.2% Rhodamine B solution for 24 hours, sectioned longitudinally and analyzed for microleakage using an optical microscope connected to a digital camera and a computer. The images were digitized and a software allowed the quantitative evaluation of microleakage in millimeters. Data were analyzed by Wilcoxon and Kruskal-Wallis tests. It was observed that there were significant differences (p < 0.05) between incisal (enamel) and cervical (dentine/cementum) margins, mainly for Ketac Molar; there was no difference (p > 0.05) between preparation methods, except for group II (high-speed/Ketac Molar) that showed higher infiltration; regarding the materials, Ketac Molar demonstrated the highest microleakage values (p < 0.05), and only Vitremer sealed completely both margins of restorations. It was concluded that air abrasion preparation did not influence microleakage in class V restorations with the employed glass ionomer cements.
authors.affiliation: Ribeirão Preto School of Dentistry, University of São Paulo, Brazil.
authors.forename: Lucia da Silva
authors.initials: Lda S
authors.lastname: Reis
authors.forename: Michelle A
authors.initials: MA
authors.lastname: Chinelatti
authors.forename: Silmara A M
authors.initials: SA
authors.lastname: Corona
authors.forename: Regina G
authors.initials: RG
authors.lastname: Palma-Dibb
authors.forename: Maria Cristina
authors.initials: MC
authors.lastname: Borsatto
mesh_terms: D020906:Air Abrasion, Dental / Q000009:adverse effects* / Q000379:methods*; D000818:Animals; D002417:Cattle; D002484:Cementation / Q000009:adverse effects / Q000379:methods*; D003763:Dental Leakage / Q000209:etiology / Q000503:physiopathology* / Q000517:prevention & control; D003794:Dental Restoration, Temporary / Q000009:adverse effects / Q000379:methods*; D004058:Diffusion; D005899:Glass Ionomer Cements / Q000009:adverse effects / Q000737:chemistry*; D066298:In Vitro Techniques; D007180:Incisor / Q000737:chemistry* / Q000503:physiopathology*; D016062:Porosity; D016896:Treatment Outcome
chemical_list: D005899:Glass Ionomer Cements