A multiparametric analysis of occlusal and periodontal jaw reflex characteristics in adult skeletal mandibular protrusion before and after orthognathic surgery.
Periodontal jaw reflex, duration of percussion sounds, tooth mobility, and time-moment analysis of occlusal contacts by the T-scan system were recorded in seven pre-orthognathic surgery patients and six post-orthognathic surgery patients over a 2-year period. The results showed that: (i) reflex response to the pressure applied to the upper right central incisor in the lingolabial direction varied, depending on the background jaw-clenching force (BCF) of the same-sided first molar. The BCF level required to elicit excitatory reflexes was only 0 kgf, and inhibitory reflexes were clearly elicited with a BCF of 1 kgf and beyond before orthognathic surgery. After orthognathic surgery BCF levels required to elicit excitatory reflexes were 0-4 kgf, and inhibitory reflexes were elicited with a BCF of 6 kgf and above; (ii) duration of percussion sounds determined via an occlusal sound analyser decreased in both the upper right central incisor and upper right first molar while tooth mobility measured by 'Periotest(R)' increased in the upper right central incisor, but did not change in the same-sided first molar after orthognathic surgery; (iii) the time moments of occlusal contacts were symmetrical toward the midsagittal axis of the occlusal plane after orthognathic surgery. The centre of the anterioposterior occlusal contacts did not differ between pre- and post-orthognathic surgery groups.
Suda
S
S
Department of Periodontology, Niigata University School of Dentistry, Niigata, Japan.
MacHida
N
N
Momose
M
M
Yamaki
M
M
Seki
Y
Y
Yoshie
H
H
Hanada
K
K
Hara
K
K
D000293:Adolescent; D000328:Adult; D001732:Bite Force; D003766:Dental Occlusion; D005500:Follow-Up Studies; D006801:Humans; D007180:Incisor / Q000503:physiopathology; D008310:Malocclusion / Q000503:physiopathology / Q000601:surgery; D008334:Mandible / Q000502:physiology*; D008963:Molar / Q000503:physiopathology; D009119:Muscle Contraction / Q000502:physiology; D010474:Percussion; D010519:Periodontium / Q000502:physiology*; D011312:Pressure; D011378:Prognathism / Q000503:physiopathology* / Q000601:surgery; D012018:Reflex / Q000502:physiology*; D013016:Sound; D013997:Time Factors; D014086:Tooth Mobility / Q000503:physiopathology