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Journal of Dental Research
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Biomaterials & Bioengineering

Resin Infiltration of Natural Caries Lesions

S. Paris, H. Meyer-Lueckel* and A.M. Kielbassa

Dept. of Operative Dentistry and Periodontology, University School of Dental Medicine, Campus Benjamin Franklin, Charité-Universitätsmedizin Berlin, Assmannshauserstr. 4-6, 14197 Berlin, Germany

Correspondence: * corresponding author, hendrik.meyer-lueckel{at}charite.de

Infiltration of non-cavitated caries lesions with light-curing resins could lead to an arrest of lesion progression. The aim of this study was to evaluate the penetration of a conventional adhesive into natural enamel caries after pre-treatment with two different etching gels in vitro. Extracted human molars and premolars showing proximal white-spot lesions were cut across the lesions perpendicular to the surface. Corresponding lesion halves were etched for 120 sec with either 37% phosphoric acid gel (H3PO4) or 15% hydrochloric acid gel (HCl), and subsequently infiltrated with an adhesive. Specimens were observed by confocal microscopy. Mean penetration depths (SD) in the HCl group [58 (37) µm] were significantly increased compared with those of the H3PO4 group [18 (11) µm] (p < 0.001; Wilcoxon). It can be concluded that etching with 15% hydrochloric acid gel is more suitable than 37% phosphoric acid gel as a pre-treatment for caries lesions intended to be infiltrated.

Key Words: caries • resin infiltration • etching • acid gel

Journal of Dental Research, Vol. 86, No. 7, 662-666 (2007)
DOI: 10.1177/154405910708600715
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