Journal of Oral Tissue Engineering

Tomographic Evaluation of Bone Regeneration by Photothermal Stimulation in a Rat Calvarial Defect

Minoru KAWAGUCHI1, 3, Koichiro MORI2, 3, Kazuko GOTO4, Ayako ISHII4, and Tetsuro IKEBE2

1Department of Dental Engineering,
2Department of Oral and Maxillofacial Surgery,
3Centre for Regenerative Medicine,
Fukuoka Dental College, Fukuoka, Japan
4Department of Dental Hygiene, Fukuoka College of Health Science,
Fukuoka, Japan

J Oral Tissue Engin 2018; 16(2):57-64.

The effect of controlled photothermal stimulation on new bone formation ability using a calvarial defect model in rats over 40 weeks old was evaluated. Photo-thermal stimulation was carried out using a photothermal device composed of an alginate-gel-containing carbon nanotubes (CNT-Alg gel) and an irradiator supplying near-infrared light. Photothermal stimulation (42°C, 15 min) was repeated every day for up to 3 months to assess the effect of thermal stimulation on bone healing of defects treated with commercially available collagen sponge. Photo-thermal stimulation accelerated bone regeneration with collagen sponge treatment compared with treatment without photothermal stimulation. There were no significant differences in microhardness values between the newly formed bone, with or without photothermal stimulation. Microhardness measurement revealed that the regenerated bones were sufficiently mature. The results of this study suggested that photothermal stimulation enhanced bone regeneration induced by expression of heat shock-related molecules.

Key words: photothermal stimulation, carbon nanotubes, bone regeneration

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