BACKGROUND The purpose of this study was to elucidate the factors that cause facial asymmetry by comparing the characteristics of the mandibular morphology in patients with mandibular prognathism with or without facial asymmetry using three-dimensional computed tomography (3D-CT). METHODS We studied 28 mandibular prognathism patients whose menton deviated by ≥ 4 mm from the midline (FA group,...

Abstract Introduction: Estimating the appropriate time for orthodontic treatment is a crucial factor. Given the earlier maturation of sinuses rather than maxillomandibular growth, finding the exact relationship between the growth of the jaws and frontal sinuses is considered to be a helpful element in Orthodontic treatment. Materials and Methods: This is a descriptive-analytical study, conduc...

Bilateral sagittal split ramus osteotomy is considered a standard technique in mandibular orthognathic surgeries to reduce unexpected bilateral stress in the temporomandibular joints. Unilateral sagittal split ramus osteotomy (USSO) was recently introduced to correct facial asymmetry caused by asymmetric mandibular prognathism and has shown favorable outcomes. If unilateral surgery could guaran...

In the evaluation of the beauty and functional integrity of the lower face, the oral cavity, teeth, mandible, maxilla, and the size and position of the tongue are important. The tongue locates forward and is larger than normal in prognathism, in which the jaw protrudes from the skull. It is not clear whether an enlarged tongue causes the open bite, protrusion or dental arch misalignment, or is ...

Department of Orthodontics, School of Dentistry, National Taiwan University, Taipei; Department of Orthodontics, School of Dentistry, Kaohsiung Medical University, Kaohsiung; Institute of Biomechanical Engineering, National Cheng Kung University, Tainan. Received: 3 May 2002. Revised: 3 June 2002. Accepted: 9 July 2002. Reprint requests and correspondence to: Dr. Hong-Po Chang, Department of Or...

BACKGROUND Class III malocclusion is a maxillofacial disorder that is characterised by a concave profile and can be attributed to both genetic inheritance and environmental factors. It is a clinical challenge due to our limited understanding of its aetiology. Revealing its prototypical diversity will contribute to our sequential exploration of the underlying aetiological information. The object...

Osteogenesis imperfecta (OI) causes a variety of craniofacial changes of which skull and facial bone deformities can often be clinically observed. One such feature is mandibular prognathism, which is more frequent in OI than in a healthy population. It can result from excessive mandibular growth, surprisingly often from hypoplastic development of the maxilla, or from their combination. In OI, m...

Objective: Mandibular prognathism is inadaptability between skull and mandible and is one phenotype of class III malocculsion. Polydiastema may be present together with class III malocclusion. Skeletal class III malocclusion with mandibular prognathism can be diagnosed by cephalometric parameters. Study Design: A 22-year-old man complaining about difficult mastication and speech was referred to...

The SSRO with rigid fixation (RF) can be best applied for correction of mandibular prognathism after the age of 12 years (after eruption of the mandibular second molars) in symmetric and mild to moderate asymmetric cases. Contraindications for the SSRO include 1) presence of unerupted mandibular second molars: 2) a severely narrow anteroposterior or mediolateral dimension of the ramus with no m...