Performance of sealer materials and infiltrants in the enamel white spot lesion under cariogenic challenge - study in vitro: Mechanical and micro-morphological analysis

Author(s)

Kamila Rosamilia Kantovitz

• Document type: Doctoral Thesis
• Press: Piracicaba, SP.
• Institution: Universidade Estadual de Campinas (UNICAMP). Faculdade de Odontologia de Piracicaba
• Defense date: 2010-04-02

Examining board members

Regina Maria Puppin Rontani; Maria Cristina Borsatto; Gisele Maria Correr; Maria Beatriz Duarte Gavião; Roberta Caroline Bruschi Alonso

• Advisor: Cinthia Pereira Machado Tabchoury; Regina Maria Puppin Rontani

Abstract

Pit and fissure dental sealants are recognized as an important adjunct approach for caries prevention in high caries risk patients. The caries-like lesions enamel need special preventive action and accurate diagnosis. The decision whether the sealant must been made on the sound, inicial carious enamel or remineralized enamel may lead to uncertainties. In order to facilitate the accomplishment of this Thesis, it was divided into two chapters, as described on the following descriptions. Chapter 1: to present a literature review on the effects of infiltrants and sealers on the inhibition of enamel demineralization of non-cavitated enamel lesions. Eighteen studies identified were included in the project critical appraisal. Two papers were classified as grade A (in vivo studies), nine as grade B (in vitro studies), and seven as grade C (in vitro studies). Chapter 2: to evaluate the microtensile bond strength (uTBS) of resinous sealant materials (FluroShield e Helioseal Clear Chroma) on different enamel substrates (sound, caries-like lesion, and caries-like lesion + varnish topical fluoride appication) after a cariogenic challenge (pH-cycling). The caries-like lesion + varnish topical fluoride showed the highest values, following sound and caries-like lesion enamel. Additionally, uTBS values were dependent on both materials and pH-cycling. FluroShield presented the highest uTBS values, when the materials were submitted to pH-cycling. Mixed failure was the most frequently observed failure for all groups. It could be concluded that while fissure sealing act as a diffusion barrier on the top of the lesion surface, the infiltration technique creates a barrier inside the lesion, replacing lost mineral with low-viscous light-curing resin. The highest values were found for caries-like lesion + varnish topical fluoride enamel. When sealer materials were submitteted to cariogenico challenge (pH-cycling), FluroShield showed the highest microtensile bond strength values. The sealant/enamel microtensile bond strength (uTBS) was enamel substrate dependent. (AU)