American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics
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Am J Orthod Dentofacial Orthop · Feb 1989
Comparative StudyA clinical study of maxillary canine retraction with a retraction spring and with sliding mechanics.
The efficiency of maxillary canine retraction by means of sliding mechanics along an 0.018-inch labial arch and an AlastiK chain was compared with that using the canine retraction spring designed by Gjessing. The rate of canine retraction and degree of tipping, and rotation of the canines were studied in 21 subjects by one of these two methods on either side of the dental arch. ⋯ The canine was retracted faster and with less distal tipping with the spring than with the sliding mechanics. The canine retraction spring was not superior to the sliding mechanics in controlling canine rotation during the retraction.
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Am J Orthod Dentofacial Orthop · Feb 1988
Comparative StudyDental and occlusal characteristics of children with neuromuscular disease.
Seventy-nine pediatric patients with neuromuscular diseases were examined for dental and occlusal characteristics. Fifty-six patients suffered from primary muscle disease (myopathies) including 43 with Duchenne's muscular dystrophy. The neuromuscular disorders in 19 patients were of neuropathic origin, while four were caused by a fault in the neuromuscular junction. ⋯ The Duchenne patients exhibited a statistically significant delay in dental emergence (1.06 years), unlike the other myopathies (0.31 years) and the neurogenic disorders groups (-0.03 years). This study emphasizes the influence of muscular environment on dental development in general. The dentition may be more affected in muscular dystrophies stemming from degenerative or inflammatory muscle damage than in those originating from nerve malfunction or disorder of the neuromuscular junction.