Condylar bone change and sagittal incisal and condylar paths during mandibular protrusive excursion.
This study showed significant differences in sagittal condylar and incisal path angles during mandibular protrusive excursion, as well as flattening of the condylar path related to the existence and type of condylar bone change. Twenty-eight (28) patients with signs and symptoms of TMJ disorders were studied, using a six-degrees-of-freedom measuring device and helical CT. Sagittal incisal and condylar path angles at two mm and three mm condylar path lengths (CPL) were significantly shorter in the bilateral condylar bone change (BBC), compared to the no bone change (NBC) group. Also, NBC incremental sagittal condylar path angles from three to five mm CPL and NBC condylar path curvature at five mm CPL were both significantly larger than in BBC. Comparing types of bone change, incremental sagittal condylar path angles from three to five mm CPL was significantly less in osteophyte than in NBC or erosion groups. Condylar path curvature at five mm CPL was also significantly less in osteophyte than in NBC.
Yamada
Kazuhiro
K
Div. of Orthodontics, Dept. of Oral Biological Science, Section for Oral Life Science, Niigata University Graduate School of Medical and Dental Sciences, 2-5274 Gakkocho-dori, Niigata, 951-8514, Japan. kazuhiro@dent.niigata-u.ac.jp
Tsuruta
Akemi
A
Hosogai
Akiko
A
Kohno
Shoji
S
Hayashi
Takafumi
T
Hanada
Kooji
K
D003766:Dental Occlusion; D005260:Female; D006801:Humans; D007180:Incisor; D007574:Jaw Relation Record / Q000295:instrumentation / Q000379:methods; D004204:Joint Dislocations / Q000473:pathology / Q000503:physiopathology; D008334:Mandible / Q000503:physiopathology*; D008335:Mandibular Condyle / Q000473:pathology* / Q000503:physiopathology; D008336:Mandibular Diseases / Q000473:pathology / Q000503:physiopathology; D009068:Movement; D016059:Range of Motion, Articular / Q000502:physiology*; D012815:Signal Processing, Computer-Assisted; D019224:Temporomandibular Joint Disc / Q000473:pathology / Q000503:physiopathology; D013705:Temporomandibular Joint Disorders / Q000473:pathology / Q000503:physiopathology*; D036542:Tomography, Spiral Computed