Dental health of junior dental students.
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Four cases of tooth fusion are presented. Three of the patients were female and one male. Radiographic examination revealed union of calcified tissues with discrete root canals and a common pulp chamber in Case 3 and the converse in Case 4. The finding of fused mandibular incisors and canines in both the deciduous and permanent dentitions is described in Case 1, while in two others unilateral fused tooth masses are described which are not repeated in the permanent dentition. The dentist should be aware of the possibility of finding fused teeth on routine dental inspection and once diagnosed the patient should be informed of the potential hazards as regards plaque accumulation and varied root canal morphology.
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A single injection of 75 mg/kg cyclophosphamide caused gross dental abnormalities in rats. Broken, malformed, overgrown, and "extra" incisors developed several weeks after drug treatment. Radioautographic investigations show no unusual features in the morphology or labeling with H3-thymidine in the odontogenic cells. The results suggest that the cytotoxic effect of the drug is a temporary one which induces a residual alteration of tooth growth.
The presence of a mucopolysaccharidase in resorbing deciduous teeth was investigated using histochemical techniques. The loss of toluidine blue metachromasia within glycosaminoglycan film substrates indicated the presence of enzyme activity, and was related to physiologic resorption. Such activity was localized to the periodontal ligament of these teeth.
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Extraction of an embedded supranumerary incisor tooth and surgical exposure of the crown of an impacted left mandibular canine tooth were performed in a 5 month-old Doberman Pinscher dog. Six months following surgery, the canine tooth was fully erupted and in normal occlusion. A review of tooth eruption in the dog is provided.
This report describes the unusual appearance seen on a panoramic radiograph of an orthodontic patient which the authors argue may represent ectopia or concomitant hypohyperdontia of the mandibular premolar teeth. A literature review describes the frequency of such anomalies in this area from previous studies. The presenting features of the patient and the differential diagnoses are explored. Treatment planning is discussed and treatment carried out in this particular case is detailed. The unusual symmetrical bilateral anomalies in this patient may point to a genetic determinant of tooth germ position and/or movement.
The case of a patient presenting with bilateral supplemental lateral incisors is reported. The upper lateral and supplemental on one side of the arch had a questionable prognosis due to extensive caries and at their removal the supplemental from the other side was successfully transplanted across the arch.
A 17-year-old male presented with bilateral double teeth in the 2 2 region and upper arch crowding. These were surgically sectioned and orthodontic treatment carried out to align 321 123. The sectioned teeth remained vital.
A case of supplemental maxillary deciduous canines is described in a ten-year-old Saudi boy. Supplemental teeth usually occur in the maxilla and occasionally in the mandible, generally involving the permanent lateral incisors. The prevalence of supplemental deciduous teeth is discussed.
A case is presented of misdiagnosis of a large mandibular cyst as a result of relying solely on orthopantomography. This demonstrates a pitfall in diagnostic radiology and illustrates the importance of clinical examination and intra-oral radiography.
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