Abstract
The objective of this study was to determine whether the distribution of compressional and tensional stress around tooth roots is influenced by the position of a temporary anchorage device and the length of the retraction hook during the distalization of the maxillary dentition. A photoelastic orthodontic model was made of photoelastic epoxy resin. Six combinations of three retraction hook lengths and two posterior Temporary skeletal anchorage devices (TAD) positions were established. Stress was applied through an elastic chain for each of the combinations. Digital photoelastic stress analysis measured the compression, tensional stress, and direction around the tooth root. Using this novel photoelastic model, we found that the distribution of compressional and tensional stress during the retraction of the maxillary dentition was significantly influenced by the position of the TAD and the length of the retraction hook.
Highlights
Several intraoral devices have been reported for the distalization of maxillary molars to achieve non-extraction treatment [1,2,3,4,5]
Tensile stress was observed at the apex of the incisor; Center region: Compressive stress was observed in the cervical area of the distal root surface from the lateral incisor to the molars; Cervical region: Tensile stress was observed in the cervical third of the mesial root surface of the second premolars
Upward stress in molars and distal stress at the cervical region in the whole dentition applied with the Temporary skeletal anchorage devices (TAD) in the cervical position, especially with a long hook
Summary
Several intraoral devices have been reported for the distalization of maxillary molars to achieve non-extraction treatment [1,2,3,4,5]. Temporary skeletal anchorage devices (TAD) have made it possible to distalize molars without mesial movement of the anterior teeth. Sugawara et al [6] reported that maxillary molar distalization using the Skeletal Anchorage System (SAS), a plate-type anchor, did not mesialize the anterior teeth. Other reports [7,8,9,10,11,12,13,14] have demonstrated distalization appliances used with TAD This method is not without similar untoward effects, and unexpected molar movements, such as tilting, translation, and other vertical movements, can occur. This system is difficult to study both in vivo and in vitro. Nakamura et al [15]
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