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Journal of Dental Research
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Biological

Root Resorption Related to Hypofunctional Periodontium in Experimental Tooth Movement

S. Sringkarnboriboon, Y. Matsumoto* and K. Soma

Orthodontic Science, Department of Orofacial Development and Function, Division of Oral Health Science, Graduate School, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan;

Correspondence: *corresponding author, y.matsumoto.orts{at}tmd.ac.jp

Orthodontic movement of non-occluding teeth may result in undesirable apical root resorption. These teeth present with a histologically altered periodontium and are considered to be hypofunctional. The purpose of this study was to compare the amount of root resorption associated with a normal and a hypofunctional periodontium in rats during experimental tooth movement caused by heavy continuous force. The mandibular first molar was induced into a non-occluding condition in the hypofunctional periodontium group. Mesial orthodontic force was applied by means of 50-gram-force closed-coil springs for 15 days in both groups. The active root-resorption lacunae from histological sections, identified by tartrate-resistant acid phosphatase, were measured in terms of length, depth, and area. The results showed that the amount of root resorption was significantly greater in teeth with a hypofunctional periodontium than in those with a normal periodontium (p < 0.05). These results suggest that orthodontic movement of non-occluding teeth should be performed with caution.

Key Words: root resorption • periodontium • hypofunction • tooth movement

Journal of Dental Research, Vol. 82, No. 6, 486-490 (2003)
DOI: 10.1177/154405910308200616
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