IntroductionTechnological advances in Dentistry have emerged primarily in the area of diagnostic tools. One example is the 3D scanner, which can transform plaster models into three-dimensional digital models.ObjectiveThis study aimed to assess the reliability of tooth size-arch length discrepancy analysis measurements performed on three-dimensional digital models, and compare these measurements with those obtained from plaster models.Material and MethodsTo this end, plaster models of lower dental arches and their corresponding three-dimensional digital models acquired with a 3Shape R700T scanner were used. All of them had lower permanent dentition. Four different tooth size-arch length discrepancy calculations were performed on each model, two of which by manual methods using calipers and brass wire, and two by digital methods using linear measurements and parabolas.ResultsData were statistically assessed using Friedman test and no statistically significant differences were found between the two methods (P > 0.05), except for values found by the linear digital method which revealed a slight, non-significant statistical difference.ConclusionsBased on the results, it is reasonable to assert that any of these resources used by orthodontists to clinically assess tooth size-arch length discrepancy can be considered reliable.
LPT caused significant histological changes in the alveolar bone during induced tooth movement, including alterations in the number of both osteoclasts and osteoblasts and in collagen deposition in both pressure and tension areas.
Objectives: The aim of this research was to investigate the influence of low-power laser on tooth movement in rats. Background: Tooth movement is closely related to the process of bone remodeling. The biologic result, with the application of a force to the tooth, is bone absorption on the pressure side and neoformation on the traction side of the alveolar bone. The laser photobiomodulation is capable of providing an increase in cellular metabolism, blood flow, and lymphatic drainage. Methods: Thirty young-adult male Wistar rats weighing between 250 and 300 g were divided into two groups, control and experimental, containing 15 animals each. The animals received orthodontic devices calibrated to release a force of 40 g/F, with the purpose of moving the first upper molar mesially. Low-intensity laser, wavelength 790 nm, was used in the experimental group; the dose was 4.5 J/ cm 2 per point, mesial and distal, on the palatal side, 11 J/cm 2 on the buccal side, and this procedure was repeated every 48 h, totaling nine applications. The active movement was clinically evaluated after 7, 13, and 19 days. Results and conclusion: The results showed no statistically significant difference, p ¼ 0.079 (T0-T7), p ¼ 0.597 (T7-T13), and p ¼ 0.550 (T13-T19) between the laser and control groups on the amount of tooth movement in the different times evaluated. It may be concluded that laser phototherapy, with the parameters in the present study, did not significantly increase the amount of tooth displacement during induced orthodontic movement in rodents.
INTRODUÇÃO: a realização de um diagnóstico acurado, assim como a correta seleção de materiais, especificamente dos braquetes, são requisitos importantes para o êxito da terapia ortodôntica. OBJETIVOS: investigar a influência de variados tipos de desenho da base de braquetes na força de adesão. METODOLOGIA: seis modelos foram avaliados mediante ensaio de cisalhamento - Discovery (Dentaurum) - metálico com retenções por laser e 13,12mm² de área da base; Monobloc (Morelli) - metálico em corpo único com protuberâncias e 10,22mm² de área; Edgewise Standard (Ortho Organizers) - metálico com base MIM (Metal Injection Molding) e 12,02mm² de área; Illusion Plus (Ortho Organizers) - porcelana com sulcos de retenção e 13,49mm² de área; Composite (Morelli) - policarbonato com protuberâncias para retenção mecânica e 14,68mm² de área; e Edgewise Standard (Morelli) - metálico com tela de retenção e 14,31mm² de área. Os braquetes foram colados em dentes bovinos (incisivos) com o sistema adesivo Fill Magic Ortodôntico (Vigodent), para a realização do teste. O ensaio foi executado em uma máquina de ensaios universal (EMIC), e a força de adesão foi computada, no momento da cisão, pelo software TESC, versão 3.01, medida em Newtons (N) e em Megapascal (Mpa). RESULTADOS E CONCLUSÕES: não houve diferença estatística entre os braquetes testados, sendo que o grupo que apresentou a maior média de força de adesão foi o Discovery com 10,12Mpa.
The aim of this study was to analyze the effect of laser or LED phototherapy on the acceleration of bone formation at the midpalatal suture after rapid maxilla expansion. Forty-five rats were divided into groups at 7 days (control, expansion, expansion and laser irradiation, and expansion and LED irradiation) and into 14 days (expansion, expansion and laser in the 1st week, expansion and LED in the 1st week, expansion and laser in the 1st and 2nd weeks, expansion and LED in the 1st and 2nd weeks). Laser/LED irradiation occurred every 48 h. Expansion was accomplished with a spatula and maintained with a triple helicoid of 0.020-in stainless steel orthodontic wire. A diode laser (λ780 nm, 70 mW, spot of 0.04 cm, t = 257 s, SAEF of 18 J/cm) or a LED (λ850 ± 10 nm, 150 ± 10 mW, spot of 0.5 cm, t = 120 s, SAEF of 18 J/cm) was applied in one point in the midpalatal suture immediately behind the upper incisors. Raman spectroscopy and histological analyses of the suture region were carried and data was submitted to statistical analyses (p ≤ 0.05). Raman spectrum analysis demonstrated that irradiation increases hydroxyapatite in the midpalatal suture after expansion. In the histological analysis of various inflammation, there was a higher production of collagen and osteoblastic activity and less osteoclastic activity. The results showed that LED irradiation associated to rapid maxillary expansion improves bone repair and could be an alternative to the use of laser in accelerating bone formation in the midpalatal suture.
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