The mandibular third molar (3M) is the tooth that is most often impacted, with lack of space being one of the reasons. In some orthodontic treatments, premolars are extracted in order to create space. The aims of our study are: firstly, to assess the changes in the angulation and position of the 3M in cases treated either with or without extraction of the first or second premolars; secondly, to...

3 Penrose (7) has independently proposed a similar scheme. The present data have been tabulated in the "fourfold table" form employed by Penrose, but the treatment of data has varied from his, and from our earlier treatment, in a number of respects. 4 The teeth most frequently reported as missing were the permanent upper lateral incisors, though lower incisors and upper or lower pre-molars were...

In the last few years, forced and unregistered child marriage has widely increased into Turkey. The aim of this study was to test the accuracy of cut-off value of 0.08 by measurement of third molar index (I3M) in assessing legal adult age of 18 years. Digital panoramic images of 293 Turkish children and young adults (165 girls and 128 boys), aged between 14 and 22 years, were analysed. Age dist...

OBJECTIVE To investigate the prevalence of impaction of permanent mandibular second molars and associated dental and radiographic characteristics of Chinese children in Hong Kong. MATERIALS AND METHODS Dental and radiographic records of a group of Chinese schoolchildren were studied retrospectively. Cases of impaction of 1 or both permanent mandibular second molars were selected. Demographic ...

During postnatal development the female is more advanced than the male in calcification and eruption of all permanent teeth, except for the third molar. In deciduous teeth the direction is reversed; males are slightly more advanced (H. V. MEREDITH, J Dent Res 25:4366, 1946). The direction and the magnitude of prenatal dental dimorphism is of interest, but has not been systematically explored. W...

Retention, that is, a permanent tooth which is unerupted more than a year after the normal age of eruption, is a relatively rare event, except in the case of the third molars and the upper canines. Transmigration is defined as the phenomenon of more than half an unerupted impacted tooth crossing the midline. We report the clinical case of a twenty-year-old patient presenting transmigration of t...

Hypodontia is the congenital absence of one or more teeth because of agenesis. The most commonly missing teeth are the third molars, the maxillary lateral incisors and the second premolars. Cases are presented of three patients with a missing mandibular incisor.

The frequency of carriers of X linked hypohidrotic ectodermal dysplasia among females with hypodontia of the permanent dentition (excluding third molars) could be as high as 1 in 500, and among females with deciduous hypodontia could be as high as 1 in 50. Since it may be possible to identify carriers form among female hypodontia cases in general by virtue of a reduced sweat pore count, the pot...