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[Monitoring of tooth displacement using eddy-current type sensor--concerning orthodontic treatment for patients with cleft lip and palate].

We frequently experienced a relapse tendency after the upper dental arch expansion in a patient with cleft lip and palate. The purpose of this study was to detect the tooth displacement right after removing the orthodontic appliance. Time-lapse monitoring of the displacement was performed on the maxillary canine in the minor segment using a non-contact eddy-current type sensor. Clinical application was tested in 9 patients with clefts, and the following results were obtained: 1) The relationship between the displacement and the output voltage of the sensor showed a good linearity with a +/- 3% standard error. 2) In 3 subjects with oronasal fistula after orthodontic treatment and in a subject with discontinuity of the maxillary dental arch, displacements toward the palatal side were recorded. 3) In 2 subjects with arch continuity in the maxilla, no significant displacement was observed. 4) The viscoelastic property of the surrounding tissue of the tested tooth could have induced the displacement monitored by this method.