Effect of different surface treatments of human occlusal sclerotic dentin on micro-tensile bond strength to resin composite core material Kwansirikul A, Sae-Lee D, Angwaravong O, Angwarawong T. Effect of different surface treatments of human occlusal sclerotic dentin on micro-tensile bond strength to resin composite core material. Eur J Oral Sci 2020; 128: 263-272. © 2020 Eur J Oral SciThe objectives of this study were to evaluate the micro-tensile bond strength (lTBS) of composite bonded to human occlusal sclerotic dentin following different surface treatments to determine the sclerotic dentin morphology. Human molars without (normal dentin; group 1) or with occlusal wear (sclerotic dentin; groups 2-5) were divided and subjected to different surface treatments, including the normal protocol for the Contax self-etch bonding system (group 1 and 2); doubled etch-prime time (group 3); pre-conditioning with 37% phosphoric acid before normal protocol (group 4); or pre-conditioning with 37% phosphoric acid before doubling the selfetching time (group 5). All teeth were restored with composite (Luxacore Z dual), sectioned into stick specimens and stored for 24 h in water before specimens were subjected to the lTBS test (n = 50 per group). The lTBS of normal dentin was not statistically significantly different from that of the sclerotic dentin groups, except for the doubled etch-prime time group which showed lower lTBS. Sclerotic dentin pre-treated with phosphoric acid resulted in less sclerotic casts and wider dentinal tubules, while doubled etch-prime time did not alter the morphology, as shown by scanning electron microscopy. In conclusion, the use of 37% phosphoric acid before applying self-etch bonding resulted in more tubule openings and a significantly higher lTBS when compared with the doubled etch-prime time group.
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