Condylar bony change and mandibular deviation in orthodontic patients – using helical CT and MRI
Identifieur interne : 001D72 ( Main/Exploration ); précédent : 001D71; suivant : 001D73Condylar bony change and mandibular deviation in orthodontic patients – using helical CT and MRI
Auteurs : Evelyn Tan Uy O [Philippines] ; Kazuhiro Yamada [Japon] ; Kooji Hanada [Japon] ; Takafumi Hayashi ; Jusuke ItoSource :
- Clinical Orthodontics and Research [ 1397-5927 ] ; 2000-08.
English descriptors
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Abstract
This study was designed to assess the relationship between condylar bony change and mandibular deviation in the orthodontic patient. Seventy‐one patients were examined with helical computed tomography and magnetic resonance imaging to assess the condylar bony change and/or disk displacement prior to acceptance for orthodontic treatment. They were grouped into no condylar bony change (NBC) and unilateral condylar bony change (UBC). Frontal and lateral cephalograms and panoramic radiographs were also utilized to evaluate craniofacial morphology, and condylar and ramal heights. The results revealed that TMJ sounds occurred more in the UBC than the NBC group at all ages; but, TMJ pain and difficulty of mouth opening did not show remarkable differences. Erosion, a characteristic feature in age 9–13 years in UBC, occurred with normal disk position or disk displacement without reduction. Flattening exhibited normal disk position in age 9–13 years but was accompanied with disk displacement in age 14–18 years and 19 years and above. Osteophyte formation was highly associated with disk displacement without reduction in all age groups. Moreover, the UBC group's mandible was deviated to the ipsilateral side with significantly shorter condylar height on the affected side. In all age groups of UBC, the difference of condylar height was highly correlated with anterior maxilla, occlusal and gonial planes and with mandibular deviation. All aforementioned results suggest that unilateral condylar bony change can occur with normal disk position or ahead of disk displacement in the young patients. It seems that unilateral condylar bony changes can cause not only mandibular deviation but can also affect the cant of maxillary basal bone, mandibular plane angle and lower dentition.
Url:
DOI: 10.1034/j.1600-0544.2000.30305.x
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Seventy‐one patients were examined with helical computed tomography and magnetic resonance imaging to assess the condylar bony change and/or disk displacement prior to acceptance for orthodontic treatment. They were grouped into no condylar bony change (NBC) and unilateral condylar bony change (UBC). Frontal and lateral cephalograms and panoramic radiographs were also utilized to evaluate craniofacial morphology, and condylar and ramal heights. The results revealed that TMJ sounds occurred more in the UBC than the NBC group at all ages; but, TMJ pain and difficulty of mouth opening did not show remarkable differences. Erosion, a characteristic feature in age 9–13 years in UBC, occurred with normal disk position or disk displacement without reduction. Flattening exhibited normal disk position in age 9–13 years but was accompanied with disk displacement in age 14–18 years and 19 years and above. Osteophyte formation was highly associated with disk displacement without reduction in all age groups. Moreover, the UBC group's mandible was deviated to the ipsilateral side with significantly shorter condylar height on the affected side. In all age groups of UBC, the difference of condylar height was highly correlated with anterior maxilla, occlusal and gonial planes and with mandibular deviation. All aforementioned results suggest that unilateral condylar bony change can occur with normal disk position or ahead of disk displacement in the young patients. It seems that unilateral condylar bony changes can cause not only mandibular deviation but can also affect the cant of maxillary basal bone, mandibular plane angle and lower dentition.</div></front></TEI><affiliations><list><country><li>Japon</li><li>Philippines</li></country></list><tree><noCountry><name sortKey="Hayashi, Takafumi" sort="Hayashi, Takafumi" uniqKey="Hayashi T" first="Takafumi" last="Hayashi">Takafumi Hayashi</name><name sortKey="Ito, Jusuke" sort="Ito, Jusuke" uniqKey="Ito J" first="Jusuke" last="Ito">Jusuke Ito</name></noCountry><country name="Philippines"><noRegion><name sortKey="Uy O, Evelyn Tan" sort="Uy O, Evelyn Tan" uniqKey="Uy O E" first="Evelyn Tan" last="Uy O">Evelyn Tan Uy O</name></noRegion></country><country name="Japon"><noRegion><name sortKey="Yamada, Kazuhiro" sort="Yamada, Kazuhiro" uniqKey="Yamada K" first="Kazuhiro" last="Yamada">Kazuhiro Yamada</name></noRegion><name sortKey="Hanada, Kooji" sort="Hanada, Kooji" uniqKey="Hanada K" first="Kooji" last="Hanada">Kooji Hanada</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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