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The impact of bimaxilly correction of mandibular prognathismus on the position of condylar processus of lower jaw

Authors :
Miković, Nikola
Vukadinović, Miroslav
Konstantinović, Vitomir
Petrović, Milan
Krasić, Dragan
Miković, Nikola
Miković, Nikola
Vukadinović, Miroslav
Konstantinović, Vitomir
Petrović, Milan
Krasić, Dragan
Miković, Nikola
Publication Year :
2016

Abstract

Mandibular prognathism is a deformity of the face and jaw which combines various forms of skeletal deviation in relations of jaws and facial proportions that are so pronounced that draw the attention of the environment and represent a handicap for the patient. The essence of this anomaly consists in a difference in the size of the upper and lower jaw. According to etiologic classification, mandibular prognathism is primarily skeletal abnormality that is manifested by inadequate size, shape and position of the lower and often the upper jaw. In the majority of patients with mandibular prognathism, optimal functional and aesthetic result can only be provided with a combined orthodontic-surgical therapy, where in some cases, bimaxillary surgical correction is indicated. It is believed that orthognathic surgery can change the position of the condyle, and this may be one of the factors contributing to early skeletal relapse and occurrence of temporomandibular dysfunction. For these reasons, we did the original analysis of cephalograms and conducted an interview with the patients, as shown in the results of this research. On the radiograms of 21 patients with mandibular prognathism, angular and linear parameters were measured to describe the changes in position of the condyle, before orthodontic preparation and six months after the surgical correction of mandibular prognathism. The purose of this study was to assess changes in condylar position and to correlate changes in condylar position with angular skeletal changes after bimaxillary surgery. There were statistically significant differences in values between the groups. Point DI - the most distal point of the condyle head, moved back to 1.38 mm (p = 0.02), a DC point - a point that marks the center collum mandible, moved back to 1.52 mm (p = 0.007 ). DI point moved upward for 1.62 mm (p = 0.04). There was a decrease in the value of the angle ArGoMe which indirectly shows the front of the rotation of the condyle...<br />Mandibularni prognatizam je deformitet lica i vilica koji objedinjuje različite oblike skeletnih devijacija u odnosima vilica i proporcijama lica koje su toliko izrazite da skreću pažnju okoline i predstavljaju hendikep za dotičnu osobu. Suština ove anomalije se sastoji u izrazitoj razlici u veličini gornje i donje vilice. Shodno etiološkoj klasifikaciji, mandibularni prognatizam je primarno skeletna nepravilnost koja se manifestuje neadekvatnom veličinom, oblikom i položajem donje a često i gornje vilice. Kod najvećeg broja pacijenata sa mandibularnim prognatizmom optimalan funkcionalni i estetski rezultat može pružiti samo kombinovana ortodontsko-hirurška terapija, pri čemu je u pojedinim slučajevima indikovana bimaksilarna hirurška korekcija. Smatra se da ortognatska hirurgija može da promeni poziciju kondila, a to može biti jedan od faktora koji doprinosi ranom skeletnom recidivu i pojavi temporomandibularnih disfunkcija. Iz tih razloga, uradili smo originalnu analizu profilnih telerentgenskih snimaka i sproveli interviju sa pacijentima u okviru istraživackog kartona koji su prikazani u rezultatima ovog istraživanja. Na telerendgenskim snimcima 21 ispitanika sa mandibularnim prognatizmom mereni su angularni i linearni parametri koji opisuju promene u položaju kondila, pre ortodontske pripreme i šest meseci nakon hirurške korekcije mandibularnog prognatizma. Takođe, cilj ove studije je bio da proceni promene pozicije kondila kao i da ne korelišu promene pozicije kondila sa angularnim skeletnim promenama nakon bimaksilarne hirurgije. Ustanovljena je statistička značajnost razlika u vrednosti parametara između grupa. Tačka DI – najdistalnija tačka na glavi kondila, pomerila se unazad 1,38 mm (p = 0,02), a tačka DC – tačka koja označava centar collum mandibulae, pomerila se, takođe, unazad za 1,52 mm (p = 0,007). Vrednost pomeranja tačke DI naviše bila je 1,62 mm (p = 0,04). Došlo je do smanjenja vrednosti ugla ArGoMe što indirektno ukazuje na prednju rotaciju kondi

Details

Database :
OAIster
Publication Type :
Electronic Resource
Accession number :
edsoai.on1228099667
Document Type :
Electronic Resource