کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
3121922 1583395 2007 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Nanomechanical and chemical characterization of incipient in vitro carious lesions in human dental enamel
موضوعات مرتبط
علوم پزشکی و سلامت پزشکی و دندانپزشکی دندانپزشکی، جراحی دهان و پزشکی
پیش نمایش صفحه اول مقاله
Nanomechanical and chemical characterization of incipient in vitro carious lesions in human dental enamel
چکیده انگلیسی

ObjectiveThe research was designed to examine the growth of in vitro carious lesions in dental enamel using nanoindentation and time-of-flight secondary ion mass spectroscopy (TOF-SIMS). This was intended to give maps of mechanical properties and chemistry over the cross-section of the lesions.MethodsIncipient carious lesions were grown on the buccal faces of 20 human premolars by exposure to acid for 3, 5, 7 or 14 days. The lesions were then cut in cross-section normal to the exposed surface. The lesions’ cross-sections were then examined using nanoindentation and TOF-SIMS.ResultsThe earliest lesions (3 days of acid exposure) showed little evidence of lesion growth, but the 5, 7 and 14 days of exposure all gave lesions with a weak, demineralized interior, but a stronger, less demineralized surface zone. The thickness of the surface zone was found to diminish with the length of exposure to acid, but it was still present even after 14 days of exposure.ConclusionThe results indicate that carious lesions develop subsurface and that the surface zone forms by a coupled diffusion process. Mechanically the lesion has a strong surface layer, but a very weak interior which makes the lesion vulnerable to mechanical loading. However, the presence of a surface zone that retains a high mineral content and is mechanically strong suggests that lesion development can be arrested and possibly reversed even when the lesions are relatively mature.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Archives of Oral Biology - Volume 52, Issue 8, August 2007, Pages 753–760
نویسندگان
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