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KMID : 0355820220430010015
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Korean Journal of Oral Anatomy
2022 Volume.43 No. 1 p.15 ~ p.32
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Difference of strain in craniofacial skeleton according to retraction force of TTBA (Tandem Traction Bow Appliance)
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Oh Hyun-Ju
Im Ja-Kyeong
Chun Youn-Sic
Kim Min-Seok
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Abstract
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The purpose of this study was to determine the effects of the Tandem Traction Bow Appliance (TTBA) on the transfer of occlusal force on the nasomaxillary complex, mandible, and cranial base. The experimental model, in which the maxilla and mandible were separate, was built on the basis of a 3-D reconstruction of a computed tomography image obtained from an adult male patient with normal occlusion. TTBA was built after implanting artificial teeth and taking an impression of the maxillary and mandibular tooth arrangement. Eight strain gauges were placed on the nasomaxillary complex; 4, on the mandible; and 5, on the cranial base. Before and after installation of TTBA with 300 g and 500 g of traction force, 100 N of compressive force was applied, and the strain values were measured. The same experiment was repeated under 200 N and 300 N of compressive force. The strain values were measured, and the data were stored and analyzed using dedicated software. TTBA was not affected to the transfer of occlusal force to the cranial base. The strain values decreased in the root apex of the maxillary first molar, root apex of the maxillary second molar, intersection of mylohoid ridge and lingual root apex of the mandibular second molar. These areas were close to the teeth that were strongly affected by the occlusal force, but because of the traction force of the TTBA that caused the mandible to rotate downward and backward and the redistribution of the occlusal force by the TTBA splint a decrease in perpendicular pressure was exhibited. The condylar neck showed an increase in strain after installation of TTBA because it was affected by the orthopedic force of the TTBA.
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KEYWORD
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occlusal force, Tandem Traction Bow Appliance, craniofacial skeleton, strain
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