Erosion-inhibiting and enamel rehardening effects of different types of saliva

Author(s)

Boteon, Ana Paula ; dos Santos, Natalia Mello ; Lamana, Larissa Di Bene Kandalaf ; Rosa, Isadora Messias Batista ; Di Leone, Camilla Cristina Lira ; Caracho, Rafaela Aparecida ; Carvalho, Thiago Saads ; Honorio, Heitor Marques ; Rios, Daniela

• Document type: Journal article
• Source: ARCHIVES OF ORAL BIOLOGY; v. 154, p. 6-pg., 2023-07-10.

Abstract

Objectives: The objective of this study was to assess the effects of in situ saliva compared to in vitro human saliva, with or without mucin, on inhibiting erosion and promoting enamel rehardening. Design: Bovine enamel blocks were randomly distributed into groups (n = 23): Gsitu (human saliva in situ), Gvitro (collected human saliva) and GvitroM (collected human saliva with mucin). The enamel blocks underwent a 2hour period for the formation of salivary pellicle, based on the assigned groups. Subsequently, they were subjected to three erosive cycles, each of them consisting of an erosive challenge (immersion in 0.65 % citric acid, pH 3.5, 1 min) and saliva exposure (immersion in situ or in vitro saliva for 2 h). Microhardness measurements were performed at each cycle, after each experimental step (erosive challenge and exposure to saliva). Results: After the first demineralization, in vitro saliva groups presented greater hardness loss, with no statistical difference between GVitroM and GVitro. After the third erosive demineralization the in situ saliva resulted in less hardness loss compared to the first demineralization. In relation to surface hardness recovery, there was no difference among types of saliva but there was a decrease in hardness as the cycles progressed. Conclusion: Saliva groups had different behaviors between the first and third demineralization, being similar after the third cycle in terms of hardness loss. Regarding hardness recovery, all saliva promoted enamel gain, but there was a gradual decrease with the progression of the cycles. (AU)

• FAPESP's process: 16/13631-7 - Comparative study of the effect of human saliva in vitro and in situ and different formulations of artificial saliva on the remineralization of erosive lesions
• Grantee: Isadora Messias Batista Rosa
• Support Opportunities: Scholarships in Brazil - Scientific Initiation