The biomechanical properties of the healing periodontium of replanted rat mandibular incisors

Dental Traumatology : Official Publication of International Association for Dental Traumatology
Josuke ShinoharaKoichiro Komatsu

Abstract

One of the most important aspects in tooth replantation seems to be restoration of the tooth support function of the healing periodontal ligament (PDL). We examined the support function, as measured by the mechanical properties, of the healing PDL at 7, 14, and 21 days after replantation of the left mandibular incisor in rats. From each dissected left mandible, a transverse section(650 microm in thickness) of the incisor was cut through an axis near the labial alveolar crest. Each section was intrusively loaded at a rate of 5 mm min(-1), and the shear stress-strain curve for the PDL was analyzed. Mechanical measures of the healing PDL showed gradual improvement after replantation. By 21 days, the mechanical strength returned to 53% of the control value; the extensibility, to 85%; the stiffness, to 61%; and the toughness, to 52%. The healing PDL exhibited reattachment of fibers in the middle region of the PDL, and the birefringent collagen fibers appeared to have regained the functional orientation by 14 days. The ratios occupied by the birefringent collagen fibers in the tooth-related, middle, and bone-related areas of the healing PDL gradually improved and returned to 78, 51, and 48% of the respective control values by 21 days...Continue Reading

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Citations

Jul 8, 2015·Dental Traumatology : Official Publication of International Association for Dental Traumatology·Jung Eun YooSung Chul Choi
Jun 26, 2012·Annals of Anatomy = Anatomischer Anzeiger : Official Organ of the Anatomische Gesellschaft·Kouji InoueTetsuji Sato
Feb 28, 2008·Journal of Periodontal Research·K KomatsuA Nifuji
Jun 16, 2010·Journal of Clinical Periodontology·Philippe GaultTilmann Wurtz
Nov 17, 2010·Dental Traumatology : Official Publication of International Association for Dental Traumatology·Sung Chul ChoiGue-Tae Kim
Dec 8, 2017·Clinical Oral Investigations·Luciana Artioli CostaMarcos Rogério de Mendonça

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