Parotid Gland Function and Dentin Apposition in Rat Molars
J. Leonora1,*,2,
L. Tjäderhane3, and
J.-M. Tieche1
1 Department of Physiology/Pharmacology, Risley Hall, and
2 Department of Internal Medicine, School of Medicine, Loma Linda University, Loma Linda, CA 92350, USA; and
3 Institute of Dentistry, University of Oulu, Oulu, Finland, and Department of Endodontics, Faculty of Dentistry, University of Toronto, Toronto, ON, Canada;
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Figure 1. Representative photomicrographs of sagittal sections of 1st (A,B) and 2nd (C,D) molars of rats that were either sham-operated (A,C) or parotidectomized (B,D) at 22 days of age, and then maintained on a standard rat diet for 5 wks. The dentin formation was measured between the tetracycline label, marking the onset of the experiment (arrows), and the dentin-pulp interface. The dentinal area formed during the experimental period was notably smaller in the parotidectomized animals, especially in the 1st molars.
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Figure 2. Effects of selective desalivation on dentin apposition in 1st and 2nd molars of young rats (A,B) and their terminal salivary gland and body weights (C,D). Twenty-one-day-old rats were surgically treated: sham-operated (sham), parotidectomized (Px), or submandibular/sublingual glands removed (Smx/Slx). They were maintained for 5 wks either on a standard rat diet (Std diet) (A,C) or on a high-sucrose diet (HSD) (B,D). The results for each treatment group are expressed as the mean ± SEM. Statistical difference among treatment groups was assessed by ANOVA, followed by the Bonferroni post hoc test, and group pairs found significantly different are indicated by double-headed arrows.
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Figure 3. Effects of diet texture and composition on dentin apposition in molars of growing rats (A) and their terminal salivary gland and body weight (B). Twenty-one-day-old rats were maintained for 5 wks on standard rat diet (Std diet) or on a high-sucrose diet (HSD), and each diet was presented in the form of either pellet or powder. The results for each treatment group are expressed as the mean ± SEM. Statistical difference between treatment means was assessed by ANOVA, followed by the Bonferroni post hoc test. Significant differences resulting from either the effect of diet texture (pellet vs. powder) or diet composition are indicated by double-headed arrows.
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