ABSTRACT
BACKGROUND: It has been suggested that bimaxillary protruded anterior teeth may be related to the sella turcica anatomically and embryologically through their common progenitors. AIM: This study assessed the morphological variations and linear dimensions of sella turcica in a Nigerian population with normal and bimaxillary protruded teeth. METHODOLOGY: Lateral cephalometric radiographs of orthodontic patients were assessed. Sixty-five randomly selected radiographs of patients with bimaxillary proclination were compared with 52 radiographs of normal incisor relationship subjects. Cephalometric landmarks and dimensions of sella turcica were identified and traced manually and measured. Data were analyzed using Statistical Package for Social Sciences, (SPSS version 16.0 for windows, SPSS Inc, Chicago). Descriptive and inferential statistics were used and significance level was set at P<0.05. RESULTS: Sella turcica with normal morphology accounted for 61.5% in the population while the least was sella turcica bridge with only 6%. The sella turcica dimensions were consistently larger in young adults than the adolescents, however, no statistically significant difference was reported in its length and diameter (p>0.05) except for the depth (p<0.05). Similarly, there were no statistically significant differences in sella turcica dimensions in relation to gender and incisor relationship. CONCLUSION: The prevalence of normal morphology of sella turcica in the population was 61.5%. There was no statistically significant difference in sella turcica dimensions between normal and bimaxillary protrusion subjects (p>0.05). Similarly, no significant differences in dimensions were observed in gender and age groups (p>0.05) except for the depth of sella turcica that was significantly larger in young adults (p<0.05).
ABSTRACT
BACKGROUND: Hyoid bone though constitute a small proportion of the human skeleton, its importance in relation to other facial structures cannot be overemphasized. Several studies have reported on hyoid bone position in relation to various types of malocclusion, however, to our knowledge, there has been no study on the relationship between the hyoid bone and bimaxillary incisor proclination. AIM: The aim of this study was to assess the relative position of hyoid bone in individuals with and without bimaxillary incisor proclination as well as other related demographic factors. METHODOLOGY: This was a comparative retrospective study of lateral cephalometric radiographs of orthodontic patients aged 12 to 40 years from two study locations (Ile-Ife and Lagos, Nigeria). Thirty randomly selected radiographs of patients with bimaxillary incisor proclination were compared with 30 radiographs of related cases with normal incisor relationship. These radiographs were manually traced using established cephalometric landmarks and analysed using SPSS 16. Independent t-test was used to compare mean values and statistical significant level was set as p<0.05. RESULTS: Most of the linear and angular dental/skeletal measurements in relation to hyoid bone position showed no significant differences within the compared groups. Hyoid bone position (H-TV) was found to be more anteriorly located in male (p=0.02) and in bimaxillary incisor proclination (p=0.004) patients than their female and normal incisor relationship groups respectively. Similarly, there was a highly statistically significant difference in linear measurement of the lower incisor tip to hyoid bone position (H-LIT) between the adolescent and young adult groups (p=0.01). CONCLUSION: The hyoid bone position in male and bimaxillary incisor proclination subjects were more anteriorly located when compared with female and normal incisor relationship groups respectively. Similarly, the distance between the hyoid bone position and the lower incisor tip was longer in young adults than the adolescent group.
ABSTRACT
The response of hard and soft oral tissues to prolonged uninterrupted wearing of a removable partial prosthesis in a Nigerian patient is discussed. To our knowledge only one case has been reported in the literature. In this case additional mucosal changes to the reported caries-free pattern is discussed.
