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Association between Craniofacial Growth and Urinary Bone Metabolic Markers (Pyridinoline, Deoxypyridinoline) in Growing Rats

Department of Orthodontics and Craniofacial Developmental Biology, Hiroshima University Graduate School of Biomedical Sciences, 1–2–3 Kasumi, Minami-ku, Hiroshima 734-8553, Japan;

View larger version (29K): [in a new window]   Figure 1. Landmarks and measurement items for cephalometric analysis (A) The illustration of landmarks on the lateral cephalogram for morphometric analysis. (B) Definitions of the landmarks and measurement items for cephalometric analysis.

View larger version (14K): [in a new window]   Figure 2. Changes in the body weights of rats. Upper line and left-side scale indicate the cumulative growth in the body weight of rats weekly from 4 to 20 wks (n = 7). Lower line and right-side scale denote the growth velocity. Significant difference by Student’s t test is indicated by one asterisk (p < 0.05) or two asterisks (p < 0.01).

View larger version (24K): [in a new window]   Figure 3. Changes in the size of the craniofacial skeleton and the incremental changes for every 2 wks. Upper lines and left-side scales indicate the cumulative growth in the size of the craniofacial skeleton of rats twice weekly from 5 to 20 wks (n = 7). Lower lines and right-side scales indicate their growth velocity. Significant difference by Student’s t test is indicated by one asterisk (p < 0.05) or two asterisks (p < 0.01). (A) Size of anterior cranial base (S-E). (B) Size of posterior cranial base (S-Ba). (C) Total skull length (Po-A). (D) Nasal bone length (N-A). (E) Viscerocranial height at the first molar (U1-U1'). (F) Maxillary bone length (Mu-Bu). (G) Mandibular corpus length (Go-Pg). (H) Ramus height (Co-Co'). (I) Mandibular effective length (Co-Pg).

View larger version (15K): [in a new window]   Figure 4. Changes in urinary levels of pyridinium cross-links. The amounts of pyridinoline (Pyr) and deoxypyridinoline (Dpyr) in 24-hour urine collections from rats were measured weekly from 5 to 20 wks by use of high-performance liquid chromatography (n = 7). The Pyr/Dpyr ratio was calculated from the results. Significant difference by Student’s t test is indicated by one asterisk (p < 0.05) or two asterisks (p < 0.01). (A) Pyr, (B) Dpyr, (C) Pyr/Dpyr ratio.