Evaluation of experimental resin infiltrant containing nanohydroxyapatite on color stability and microhardness in demineralized enamel

Author(s)

Zago, Jade Laisa Gordilio ; de Cerqueira, Gabriela Alves ; Ferreira, Robson de Sousa ; Aguiar, Flavio Henrique Baggio ; Tabchoury, Cinthia Pereira Machado ; Marchi, Giselle Maria

• Document type: Journal article
• Source: CLINICAL ORAL INVESTIGATIONS; v. N/A, p. 11-pg., 2023-10-06.

Abstract

ObjectiveThe aim of the study was to evaluate the effect of the addition of 10% nanohydroxyapatite in an experimental resin infiltrant on color stability and mineral loss.Material and methodsBovine enamel blocks were randomized into five groups (n = 27/group): SE (sound enamel); ICL (initial caries lesion); I (Icon (R)); E (experimental infiltrant); EH (experimental infiltrant containing 10% nanohydroxyapatite). Color evaluation (n = 15) was performed and CIEL*a*b* values were obtained at points T0 (baseline), T1 (14 days immersed on coffee solution), and T2 (28 days immersed) and data were calculated increment E00, increment WID, increment L*, increment a*, and increment b*. Cross-sectional microhardness (n = 12) was performed and lesion area ( increment S) was calculated. Images were obtained with polarized light optical microscopy at 40 x magnification (n = 5).ResultsIn color stability results, there was significant difference between time (14 and 28 days); ICL demonstrated significant difference among treated groups in all measures ( increment L*, increment a*, increment b*, increment E00, increment WID) regardless of time; I and E demonstrated similar behavior on those measures and EH differed from I in increment L*. For increment S, ICL group showed a significant difference compared to I and EH groups, but did not differ from E.ConclusionThe nanohydroxyapatite incorporation suggested an effective mineral recovery on initial caries lesion in depth; however, it showed high color variation, such as Icon. In terms of increment S, I and EH had lower mineral loss, suggesting a reinforcement on initial caries lesion.Clinical relevanceCommercial and experimental infiltrants containing nanohydroxyapatite present low color stability and might reinforce mineral in initial caries lesion. (AU)

• FAPESP's process: 21/14881-5 - Avaliação da estabilidade de cor e microdureza seccional em infiltrantes resinosos
• Grantee: Jade Laisa Gordilio Zago
• Support Opportunities: Scholarships in Brazil - Master