Effect of microabrasion and dental bleaching on the enamel roughness and microhardness. Longitudinal study in "situ"

• Grant number: 12/06271-3
• Support Opportunities: Scholarships in Brazil - Master
• Start date: June 01, 2012
• End date: February 28, 2014
• Field of knowledge: Health Sciences - Dentistry - Dental Materials
• Principal Investigator: Renato Herman Sundfeld
• Grantee: Laura Molinar Franco
• Host Institution: Faculdade de Odontologia (FOA). Universidade Estadual Paulista (UNESP). Campus de Araçatuba. Araçatuba , SP, Brazil

Abstract

The aim of this in situ study was to evaluate if the association of microabrasion enamel with dental bleaching causes damage to microabrasioned enamel properties, through the surface roughness, hardness of dental enamel and scanning electron microscopy tests. The factors under study were: procedure on 5 levels: control, microabrasion (Opalustre - Ultradent Products Inc. Utah, USA), dental bleaching (Opalescence Boost PF 38 % - Ultradent Prodcuts Inc. Utah, USA) and the association of the two procedures (immediate and late), as well as the maintenance time of the specimens in situ: 0, 1, 3, 7 days. The response variables were microhardness and surface roughness. Fifty healthy bovine teeth were used, sectioned into discs of enamel/dentin with 5.7 mm diameter. The selected specimens were randomly divided into 5 groups (n=10): control group + 0 , 1 , 3 , 7 days in situ; GI dental bleaching + 0, 1, 3, 7 days in situ; GII Microabrasion + 0, 1, 3, 7 days in situ; GIII Microabrasion + dental bleaching + 0, 1, 3, 7 days in situ and GIV Microabrasion + 0, 1, 3, 7 days in situ + dental bleaching. The results were subjected to two way repeated measures ANOVA for followed by the Tukey test at 5 %. It was observed that the enamel roughness surface was not altered by dental bleaching, with/without in situ period, but was significantly influenced by microabrasion, associated or not with dental bleaching, with/without in situ period; whereas the enamel microhardness, in a comparison between groups, was significantly decreased in the groups where enamel microabrasion was performed, regardless of association with dental bleaching; after the in situ period, there was satisfactory reestablishment of enamel microhardness. It can be conclude that the association of enamel microabrasion with dental bleaching does not cause damage on microabrasioned enamel properties.

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

FRANCO, LAURA MOLINAR; MACHADO, LUCAS SILVEIRA; SALOMAO, FABIO MARTINS; DOS SANTOS, PAULO HENRIQUE; FRAGA BRISO, ANDRE LUIZ; SUNDFELD, RENATO HERMAN. Surface effects after a combination of dental bleaching and enamel microabrasion: An in vitro and in situ study. DENTAL MATERIALS JOURNAL, v. 35, n. 1, p. 13-20, FEB 2016. (12/06271-3)

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

FRANCO, Laura Molinar. Efeito da microabrasão e do clareamento dental na rugosidade superficial e microdureza do esmalte dental: estudo longitudinal ‘in situ’. 2014. Master's Dissertation - Universidade Estadual Paulista (Unesp). Faculdade de Odontologia. Araçatuba Araçatuba.