[The histologic study on chronological changes of bone trabeclae in human postnatal mandible].
The histologic study on chronological changes of human mandible was performed using 35 postnatal cases. The changes of bone density were divided into following 2 stages. In cases of a 11 hours new born to 2 months (No. 13) baby, the bone density consisted of rather moderate parts that low. In cases of 2 months (No. 14) baby to 66 years adult, it consisted of rather low parts than moderate parts. The changes of bone maturation were divided into next 2 stages. In cases of a 11 hours new born to 3 months baby, the mandible consisted of woven-lamellar or lamellar bone. In cases of after 7 months baby to 66 years adult, it only consisted of lamellar bone. And then, the mandibular bone were exhibited manifold arrangements. The reticular arrangements were appeared locally in cases of a 11 hours new born to 2 months baby but after 3 months, these were disappeared. The oblique and horizontal arrangements were appeared mainly in cases of a 11 hours new born to 7 months baby, and after 1 years old, not only these arrangements but also islet-like and vertical arrangements were appeared partially. After 40 years old, islet like arrangements were appeared remarkably. The bone resorption was noted at the whole mandible in a case of 3 months, and it extended larger in a case of 7 months. And after 1.1 years old, it was noted as same as 7 months.
Oya
Y
Y
Department of Oral Pathology, Faculty of Dentistry, Kyuslut University, Fulatoka.
Kobayashi
I
I
D000293:Adolescent; D000328:Adult; D000368:Aged; D000375:Aging / Q000502:physiology*; D015519:Bone Density; D001862:Bone Resorption; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D008334:Mandible / Q000033:anatomy & histology* / Q000254:growth & development* / Q000502:physiology; D008875:Middle Aged