Eduardo Kazuo Sannomiya

Influence of Low-Level Laser on the Speed of Orthodontic Movement

INTRODUCTION This study evaluated the effect of low-level laser irradiation on the speed of orthodontic tooth movement of canines submitted to initial retraction. METHODS Twenty-six canines were retracted by using NiTi spring (force of 150 g/side). Thirteen of those were irradiated with diode laser (780 nm, 20 mW, 10 sec, 5 J/cm(2)) for 3 days, and the other 13 were not irradiated and thus were considered the control group. Patients were followed up for 4 months, and nine laser applications were performed (three each month). The movement of the canines was evaluated through 3D casts, and the statistical analysis was performed with ANOVA and Tukey tests (p < 0.05). Periapical radiographs of the studied teeth were submitted to Levander, Malmgreen, and alveolar bone ridge analyses to evaluate tissue integrity and were compared with the Wilcoxon test (p < 0.05). RESULTS A statistically significant increase in the movement speed of irradiated canines was observed in comparison with nonirradiated canines in all evaluation periods. No statistically significant difference was observed in bone and root resorption of canines, whether irradiated or not. CONCLUSION The diode laser used within the protocol guidelines increased the speed of tooth movement. This might reduce orthodontic treatment time.

DNA damage and cellular death in oral mucosa cells of children who have undergone panoramic dental radiography

BackgroundDespite wide use as a diagnostic tool in medical and dental practice, radiography can induce cytotoxic effects and genetic damage.ObjectiveTo evaluate DNA damage (micronucleus) and cellular death (pyknosis, karyolysis and karyorrhexis) in exfoliated buccal mucosa cells taken from healthy children following exposure to radiation during dental radiography.Materials and methodsA total of 17 children who had undergone panoramic dental radiography were included.ResultsWe found no statistically significant differences (P > 0.05) between micronucleated oral mucosa cells in children before and after exposure to radiation. On the other hand, radiation did cause other nuclear alterations closely related to cytotoxicity including karyorrhexis, pyknosis and karyolysis.ConclusionTaken together, these results indicate that panoramic dental radiography might not induce chromosomal damage, but may be cytotoxic. Overall, the results reinforce the importance of evaluating the health side effects of radiography and contribute to the micronucleus database, which will improve our understanding and practice of this methodology in children.

Surgical planning for resection of an ameloblastoma and reconstruction of the mandible using a selective laser sintering 3D biomodel

Ameloblastoma is a benign locally aggressive infiltrative odontogenic lesion. It is characterized by slow growth and painless swelling. The treatment for ameloblastoma varies from curettage to en bloc resection, and the reported recurrence rates after treatment are high; the safety margin of resection is important to avoid recurrence. Advances in technology brought about great benefits in dentistry; a new generation of computed tomography scanners and 3-dimensional images enhance the surgical planning and management of maxillofacial tumors. The development of new prototyping systems provides accurate 3D biomodels on which surgery can be simulated, especially in cases of ameloblastoma, in which the safety margin is important for treatment success. A case of mandibular follicular ameloblastoma is reported where a 3D biomodel was used before and during surgery.

Avaliação qualitativa entre as radiografias cefalométricas laterais digital e convencional

AbstractAim: This study aimed to evaluate, by cephalometric tracing and measurements, the difficulty in the localization of structures and points on both conventional and digital lateral cephalograms. Methods: The sample comprised 30 lateral cephalograms, being 15 conventional and 15 digital. These radiographs were taken from 15 Brazilian adult subjects, with achievement of one conventional and one digital cephalogram for each subject. Results: The obtained data revealed no statistically significant difference between the two study methods. Conclusion: Thus, it was concluded that, regardless of the utilized method, the professional performing the cephalometric tracing, either manually or with a computer software, should be well trained and calibrated for that. Keywords: Cephalometric radiography. Conventional radiography. Digital radiography. 8. HOUSTON, W. J. B. The analysis of errors in orthodontic measure-ments. Am. J. Orthod. , St. Louis, v. 83, no. 5, p. 382-390, 1983.9. MILES, D. A.; LANGLAIS, R. P.; PARKS, E. T. Digital X-rays are here. Why aren´t you using them?