2 research outputs found

    Comparison of canine and premolar root lengths between group function and canine guided occlusions

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    A research report submitted to the Postgraduate committee in partial fulfilment of the requirements for the degree of Master of Dentistry in the branch of Orthodontics Parktown, Johannesburg, South Africa 2016Background: During orthodontic treatment, the maxillary canines are commonly extruded to give a patient canine disocclusion, without the clinician having previously checked as to whether the presenting function was canine guided occlusion or group function occlusion. There is a general belief that the roots of canines are longer than premolars and therefore are able to better withstand occlusal forces than the other teeth. Aim: The aim of this research was to compare the root lengths of the canines and premolars between and within subjects with canine guidance (CG) and group function (GF). Methods: Root lengths of canines and premolars were measured on periapical radiographs and compared between and within subjects with CG and GF. Results: The canine roots were generally longer than those of the premolars in both groups. However, this difference was much greater in the CG group compared with GF. Premolar roots in GF were significantly longer than in CG. Conclusion: Canine and premolar root lengths are fairly similar in GF but not in CG, where the canine roots are much longer than premolars. The roots of premolars in GF occlusion are longer than those in CG occlusion. There is no difference in root lengths of the canines between CG and GF occlusions.MT201

    Incidental Pathologic Findings from Orthodontic Pretreatment Panoramic Radiographs

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    Panoramic radiography is frequently performed for new patients, follow-ups and treatment in progress. This enables dental clinicians to detect pathology, view important structures, and assess developing teeth. The objective of the study was to determine prevalence of incidental pathologic findings (IPFs) from orthodontic pretreatment panoramic radiographs at a university dental hospital. A retrospective cross-sectional review was conducted of pretreatment panoramic radiographs, using data collection sheets with predefined criteria. Demographic data and abnormalities (impacted teeth, widening of periodontal ligament, pulp stones, rotated teeth, missing teeth, unerupted teeth, crowding, spacing, supernumerary teeth, and retained deciduous teeth) were reviewed. SPSS 28.0 was used to analyze data with statistical tests set at a 5% significance level. Results: One hundred panoramic radiographs were analyzed with an age range of 7 to 57 years. The prevalence of IPFs was 38%. A total of 47 IPFs were detected with altered tooth morphology predominantly (n = 17). Most IPFs occurred in males (55.3%), with 44.7% in females. A total of 49.2% were in the maxilla and 50.8% in the mandible. This difference was statistically significant (p < 0.0475). Other abnormalities were detected in 76% of panoramic radiographs; 33 with IPFs and 43 without. A total of 134 other abnormalities detected showed predominantly impacted teeth (n = 49). Most of these abnormalities were in females (n = 77). Conclusions: The prevalence of IPFs was 38%, predominated by altered tooth morphology, idiopathic osteosclerosis, and periapical inflammatory lesions. Detection of IPFs from panoramic radiographs underscored the importance for clinicians to examine them for comprehensive diagnosis and treatment planning, especially in orthodontics