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Dentin Caries Zones: Mineral, Structure, and Properties

¹ Department of Preventive and Restorative Dental Sciences, University of California, 707 Parnassus Ave. Box 0758, Dentistry 2246, San Francisco, CA 94143-0758, USA;
² Naval School of Health Sciences, 2310 Craven St., Bldg. 3232, San Diego, CA 92136, USA; and
³ Department of Preventive and Restorative Dental Sciences, University of California, 3333 California St., Laurel Heights 495C3 Box 1361, San Francisco, CA 94143-1361, USA

View larger version (32K): [in this window] [in a new window]   Figure 1. Carious morphological features. (a) Representative section through an arrested dentin caries lesion showing each Caries Detector zone, pink (P), light pink (L), transparent (T), and apparently normal (N). AFM height images (n = 61) showing examples of (b) tubule occlusion (TO) (scale bar = 1 µm), 4 = open, 3 = partial, 2 = closed, 1 = covered; (c) peritubular dentin (PT) (scale bar = 1 µm), 4 = complete, 3 = partial, 2 = none, 1 = distorted (images 30 x 30 µm); (d) PT rating means for each CD stain (n = 8) with 95% confidence boundaries indicated; (e) intertubular roughness (Ra) measurement means of CD stain zones (n = 8), with 95% confidence boundaries indicated. (Different letters a, b indicate non-overlapping confidence bounds corresponding to significant differences; error bars show 95% confidence bounds.)

View larger version (24K): [in this window] [in a new window]   Figure 2. Nanomechanical properties of dentin caries lesions—AFM nano-indentation in hydrated and dry conditions. (a) Elastic modulus (E) in GPa of 1 lesion, under hydrated and dry conditions, and control (normal dentin). (b) E for each CD stain (n = 8) (Different letters a, b indicate non-overlapping confidence bounds corresponding to significant differences; error bars show 95% confidence bounds.)

View larger version (31K): [in this window] [in a new window]   Figure 3. Digital transverse microradiography (TMR). (a) Vol% mineral color gradient TMR image showing a representative dentin caries lesion; inset shows corresponding CD-stained lesion. (b) Line profile showing vol% mineral along the line shown in (a), vs. distance in µm along lesion from above pulp to just above DEJ; (c) mineral content vs. E hydrated and dry (n = 8) [correlation (r) significant for E dry, p < 0.05]; and (d) vol% mineral averages by CD stain (n = 8). (Different letters a, b, c, d indicate non-overlapping confidence bounds corresponding to significant differences; error bars show 95% confidence bounds.) could also distinguish

Journal of Dental Research, Vol. 88, No. 1, 71-76 (2009)
DOI: 10.1177/0022034508327552


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