Abstract
BackgroundCalcification between the anterior and posterior clinoid processes, also the so-called sella turcica bridging, has been associated in some studies with skeletal anomalies as well as with dental and eruption disturbances. It was hypothesized that sella turcica bridging was associated with an altered direction of dental eruption. The aim of the study was to assess whether there was a relationship between the degree of calcification and the presence or absence of an alteration in the tooth eruption direction.Material and MethodsA case-control multicenter study was conducted. The study population consisted of 150 subjects (age 10-50 years), 30 of which presented some type of alteration of the direction canine eruption (impactation or transposition) (cases) and 120 selected at random who did not present altered direction of dental eruption (controls). Cases and controls were matched by age, sex, and approximate date of starting orthodontic treatment. Lateral cephalometric radiographies were obtained and the extent of the sella turcica bridging was measured using a Vernier caliper and scored as no calcification, partially calcified, and completely calcified.ResultsThe frequency of a partially or completely calcified sella turcica bridge was significantly higher among cases with altered direction of dental eruption as compared with controls. There was a trend towards a shorter length of sella turcica in subjects with two or more canine eruption alterations. Sella turcica bridging was unrelated to sex, but it was significantly influenced by age.ConclusionsSella turcica bridging is frequently detected in subjects with altered direction of dental eruption of canines. Key words:Dental eruption, sella turcica bridging, anterior clinoid process calcification, posterior clinoid process calcification, cephalometric radiographs.
Highlights
Cephalometric measurements are mainly used to assess skeletal and dental patterns for predicting facial growth
Rational of the study was supported in findings of previous studies published in the literature showing a higher prevalence of altered direction of dental eruption in association with sella turcica bridging [5,6,20,21,22,23]
The diagnosis of sella turcica bridging should be establish with caution since radiographic overlapping of the anterior and posterior clinoid processes may be confused with actual bone fusion [3,5]
Summary
Cephalometric measurements are mainly used to assess skeletal and dental patterns for predicting facial growth. Transposition of teeth has been defined as a form of ectopic eruption which involves a change in the position of two adjacent teeth or the development and eruption of a tooth in a position normally occupied by a non-adjacent tooth [13,15] The etiology of this anomaly remains unclear, it has been suggested that genetic and environmental factors play a role in this multifactorial condition [16,17]. Calcification between the anterior and posterior clinoid processes, the so-called sella turcica bridging, has been associated in some studies with skeletal anomalies as well as with dental and eruption disturbances. Conclusions: Sella turcica bridging is frequently detected in subjects with altered direction of dental eruption of canines
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