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Resin infiltration is a minimally invasive technique to treat mild hypomineralized lesions. It seals the porosity of the affected enamel, strengthens the enamel defect and improves the aesthetics of the lesion. However, there are disadvantages such as lack of evidence on its long-term durability and microleakage. This article provides an overview on the resin infiltration concept and the procedure for its application.
CPD/Clinical Relevance:
Resin infiltration is a minimally invasive procedure that occludes the pores and inhibits further demineralization. within the lesion body.
Article
Enamel porosity could be due to an enamel defect or an early stage of enamel caries. Regardless of the aetiology, the porosity of the enamel structure leads to an optical phenomenon dependent on the pore volume of the body of the defect. During demineralization of the enamel or an interruption to the mineralization of the enamel by an insult, the pore volume of the affected enamel increases, thus changing the refractive index (RI) of the lesion. The difference in the refractive indices between sound enamel and the lesion affects light scattering, making the lesion visually distinguishable. Such lesions have a range of discolouration, including white, white-creamy, creamy-yellow or yellow-brownish colours.1
For clinical examination of the lesion, it is essential to dry the tooth because the difference in the refractive indices (RI) between sound enamel (1.63) and air (1.0) is greater than that between enamel and water (1.33). If the lesion is only visible on a dry tooth surface, the depth is probably in the outer enamel, whereas a visible lesion on a wet tooth surface will indicate that the lesion has progressed more into the enamel and possibly, into dentine.2,3
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