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Journal of Dental Research
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Diurnal Variation in the Response of the Mandible to Orthopedic Force

S. Yamada1,*, S. Saeki1, I. Takahashi1, K. Igarashi1, H. Shinoda2 and H. Mitani1

1 Division of Orthodontics, Department of Life-Long Oral Health Science, and
2 Division of Pharmacology, Department of Oral Biology, Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi, Aoba-ku, Sendai 980-8575, Japan;


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  		Figure 1. Reference points for linear and angular measurements. Da: antero-superior edge of the mandibular alveolar bone. Cd: most posterior point on the condyle. In: root apex of the mandibular incisor. Go: posterior tip of the angular process. aGo: deepest point on the antegonial notch. The length of the mandibular process (Cd-aGo), length of the condylar process (Cd-In), mandibular length (Da-Cd and Da-Go), and height of the mandibular ramus (Cd-Go) were measured. Angular measurements used in the present study were Da-Cd-aGo and Cd-Go-Da, which reflect the form of the ramus process.

 

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  		Figure 2. Histological specimens stained with H-E of central area of the mandibular condylar cartilage (A1 to D1) and photomicrographs of immunoreactivity for type II (A2 to D2) and type X collagen (A3 to D3) antibody in the central area of the mandibular condylar cartilage. (A) Control group, (B) Whole-day group, (C) Light-period group, and (D) Dark-period group. F, fibrous layer; P, proliferative cell layer; T, transitional layer; M, mature cell layer; H, hypertrophic cell layer. Scale bar = 200 µm.

 

Journal of Dental Research, Vol. 81, No. 10, 711-715 (2002)
DOI: 10.1177/154405910208101011
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