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Class II malocclusion division 1: a new classification method by cephalometric analysis
Pubblication date: 09/2012
Authors: L. Perillo, G. Padricelli, G. Isola*, F. Femiano, P. Chiodini**, G. Matarese*
Institution: Department of Dentistry, Orthodontics and Surgery,
Second University of Naples, Italy
* Department of Odontostomatology, School of Dentistry, University of Messina, Messina, Italy
** Department of Medicine and Public Health,
Second University of Naples, Naples, Italy
Publication: European Journal of Paediatic Dentistry
Publisher: Ariesdue Srl
Keywords: Mandibular retrusion, Craniofacial growth, Class II Division 1, Cephalometric analysis
Title: Class II malocclusion division 1: a new classification method by cephalometric analysis
Abstract: Aim The purpose of this study was to analyse the craniofacial and dentofacial skeletal characteristics in untreated subjects with Class II, division 1 malocclusion by mandibular retrusion and to identify different types and their prevalence.
Materials and methods In 152 subjects with Class II, division 1 malocclusion by mandibular retrusion, the differences were determined by lateral cephalograms analysis of variance and chi-square test, respectively. P<0.05 was considered significant. Seven types of mandibular retrusion were identified: three pure, dimensional, rotational and positional, and four mixed.
Results All patients showed significant inter-group differences with P between 0.005 and 0.001. The dimensional type was the most common (28.9%) and the rotational-positional type was the rarest (5.9%). The pure dimensional type had the shortest mandibular body; the pure rotational type had larger SN/GoMe and the lowest AOBO; the pure positional type presented the flattest cranial base, high AOBO. In the mixed types, dento-skeletal features changed depending on how the main types assorted.
Conclusions Identifying the type of mandibular retrusion is important for differential diagnosis in clinical practice and research.