Dentinal fluid flow is rarely taken into account in studies of root caries. Objectives: To investigate the mutual effects of in vitro perfusion and dentin demineralization. Additionally, to analyze the correlation between the remaining dentin thickness and the degree of demineralization. Methods: Dentin windows on the buccal cervical tooth surfaces were subjected to demineralization either with or without perfusion at 3.14 kpA. Throughout the demineralization process, perfusion rate through the dentin was measured using a fluid transport model. The mineral loss and the lesion depth were quantified by transverse microradiography (TMR). The dentin thickness was measured on sections using a computerized image analysis program. Results: Although, the amount of mineral loss from the lesions was reduced by 22% due to dentin perfusion, the lesion depth was reduced only by 8%. The perfusion rate did not change throughout the demineralization process. Lesions formed in closer proximity to the pulp exhibited increased mineral loss and lesion depth. Conclusions: Dentinal fluid flow offers some protection against demineralization. It is concluded that in vitro studies on root (dentin) caries, in order not to deviate from the clinical reality, should consider the effect of the dentinal fluid flow.

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