The Distribution of Maxillo-Mandibular Position in Class II,1 and Class II,2 Malocclusions With Deepbite and Different Rotation Types

Abstract

Aim: The aim of this study was to investigate the frequency of maxillo-mandibular position combinations that contributing to the emergence of Class II malocclusion types, according to the mandibular rotation models. Material and Method: The study was consisted of 358 subjects 177 Class II,1 and 181 Class II,2 which were characterized with dento-skeletal Class II malocclusion and increased overbite. Both Class II,1 and Class II,2 subjects were divided into three groups, as Hypodivergent, Normodivergent and Hyperdivergent, based on their mandibular plane angle SN/GoGn . Then six different combinations K.1-K.6 , which referred to maxillo-mandibular relation at sagittal dirrection, were constituted for both malocclusion groups at each rotation types. The frequency of these combinations were determined for all study groups and the inter-group differences were compared by “Z” test.Results: It was determined that, there was no difference in terms of maxillo-mandibular combinations between Class II,1 and Class II,2 malocclusions except Normodivergent group. In all rotation groups the most frequent combinations for both Class II malocclusions were combinations of normal maxilla-retrognathic mandibula K.2 and bimaxillary retrognathia K.1 . In addition it was found that, the combination of prognathic maxilla-normal mandibula is also common in Hypodivergent group. The frequency of bimaxillary retrognathia was increased with mandibular posterior rotation. Conclusion: The type of mandibular rotation is effective on maxillo-mandibulary position in Class II,1 and Clas II,2 malocclusions characterized with deepbite.

Keywords

• Deepbite, Class II,1 malocclusion, Class II,2 malocclusion, Mandibular rotation models, Maxillo-mandibular position

Farklı rotasyon modellerine sahip derin kapanışlı sınıf II ,1 ve sınıf ıı, 2 malokluzyonlu bireylerde maksillo-mandibular konum dağılımları

Abstract

Amaç: Bu çalışmanın amacı, Sınıf II malokluzyon tiplerinin ortaya çıkışında katkısı bulunan maksillo-mandibular konum kombinasyonlarının görülme sıklıklarının, mandibular rotasyon modellerine göre incelenmesidir. Gereç ve Yöntem: Çalışma dental ve iskeletsel Sınıf II malokluzyonun yanısıra, artmış overbite’a da sahip 177’si Sınıf II,1 ve 181’i Sınıf II,2 olmak üzere toplam 358 birey üzerinde yürütülmüştür. Sınıf II malokluzyon grupları ayrıca mandibular plan açıları SN/GoGn dikkate alınarak Hipodiverjan, Normodiverjan ve Hiperdiverjan olmak üzere 3 alt gruba ayrılmıştır. Bunu takiben her bir rotasyon modelindeki Sınıf II,1 ve Sınıf II,2 malokluzyonlar için sagittal yönde maksillo-mandibular ilişkiyi belirten 6 ayrı kombinasyon K.1-K.6 oluşturularak yüzde dağılımları hesaplanmış ve gruplar arası farklılıklar “Z” testi ile karşılaştırılmıştır. Bulgular: Normodiverjan grup haricinde Sınıf II,1 ve Sınıf II,2 malokluzyonlar arasında maksillo-mandibular kombinasyonlar bakımından fark olmadığı belirlenmiştir. Tüm rotasyon modellerinde Sınıf II malokluzyonların her ikisinde de en sık rastlanan kombinasyonların normal maksilla- retrognatik mandibula K.2 kombinasyonu ile bimaksiller retrognati K.1 kombinasyonu olduğu tespit edilmiştir. Buna ilaveten Hipodiverjan rotasyon modelinde prognatik maksilla- normal mandibula kombinasyonun da K.5 sık görüldüğü belirlenmiştir. Mandibula rotasyon modeli posteriora kaydıkça bimaksiller retrognati görülme oranı artmıştır. Sonuç: Mandibular rotasyon modeli, derin kapanışa sahip Sınıf II,1 ve Sınıf II,2 malokluzyonlarda maksillo-mandibular konum üzerinde etkilidir.

Keywords

• Derin kapanış, Sınıf II,1 malokluzyon, Sınıf II,2 malokluzyon, Mandibular rotasyon modelleri, Maksillo-mandibular konum

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