Effect of different root caries treatments on the sealing ability of conventional glass ionomer cement restorations

Author(s)

Geraldo-Martins, Vinicius R. ^[1] ; Lepri, Cesar P. ^[1] ; Palma-Dibb, Regina G. ^[1]

Affiliation

^[1] Univ Sao Paulo, Ribeirao Preto Sch Dent, Dept Restorat Dent, BR-14040904 Ribeirao Preto, SP - Brazil

• Document type: Journal article
• Source: Lasers in Medical Science; v. 27, n. 1, p. 39-45, JAN 2012.
• Web of Science Citations: 7

Abstract

In this study we compared the microleakage of conventional glass ionomer cement (GIC) restorations following the use of different methods of root caries removal. In vitro root caries were induced in 75 human root dentin samples that were divided in five groups of 15 each according to the method used for caries removal: in group 1 spherical carbide burs at low speed were used, in group 2 a hand-held excavator was used, and in groups 3 to 5 an Er,Cr:YSGG laser was used at 2.25 W, 40.18 J/cm(2) (group 3), 2.50 W, 44.64 J/cm(2) (group 4) and 2.75 W, 49.11 J/cm(2) (group 5). The air/water cooling during irradiation was set to 55%/65% respectively. All cavities were filled with GIC. Five samples from each group were evaluated by scanning electron microscopy (SEM) and the other ten samples were thermocycled and submitted to a microleakage test. The data obtained were compared by ANOVA followed by Fisher's test (pa parts per thousand currency sign0.05). Group 4 showed the lowest microleakage index (56.65 6.30; p < 0.05). There were no significant differences among the other groups. On SEM images samples of groups 1 and 2 showed a more regular interface than the irradiated samples. Demineralized dentin below the restoration was observed, that was probably affected dentin. Group 4 showed the lowest microleakage values compared to the other experimental groups, so under the conditions of the present study the method that provided the lowest microleakage was the Er,Cr:YSGG laser with a power output of 2.5 W yielding an energy density of 44.64 J/cm(2). (AU)

• FAPESP's process: 08/07403-5 - Influence of different root caries removal methods on the dentin substrate and on glass ionomer restorations
• Grantee: Regina Guenka Palma-Dibb
• Support Opportunities: Regular Research Grants
• FAPESP's process: 07/08140-5 - INFLUENCE OF DIFFERENT METHODS OF ROOT CARIES REMOVAL ON DENTAL SUBSTRATE AND ON SEALING ABILITY OF GLASS IONOMER RESTORATIONS
• Grantee: Vinícius Rangel Geraldo Martins
• Support Opportunities: Scholarships in Brazil - Post-Doctoral