Cephalometric evaluation of the predictability of bimaxillary surgical-orthodontic treatment outcomes in long face pattern patients: a retrospective study

OBJECTIVE: The aim of this study was to compare by means of McNamara as well as Legan and Burstone's cephalometric analyses, both manual and digitized (by Dentofacial Planner Plus and Dolphin Image software) prediction tracings to post-surgical results. METHODS: Pre and post-surgical teleradiographs (6 months) of 25 long face patients subjected to combined orthognathic surgery were selected. Manual and computerized prediction tracings of each patient were performed and cephalometrically compared to post-surgical outcomes. This protocol was repeated in order to evaluate the method error and statistical evaluation was conducted by means of analysis of variance and Tukey's test. RESULTS: A higher frequency of cephalometric variables, which were not statistically different from the actual post-surgical results for the manual method, was observed. It was followed by DFPlus and Dolphin software; in which similar cephalometric values for most variables were observed. CONCLUSION: It was concluded that the manual method seemed more reliable, although the predictability of the evaluated methods (computerized and manual) proved to be reasonably satisfactory and similar.

OBJETIVOS: a proposta desse trabalho foi comparar, por meio das análises cefalométricas de McNamara, Legan e Burstone, os traçados de previsão manuais e os digitalizados pelos programas Dentofacial Planner Plus e Dolphin Imaging, com os resultados pós-cirúrgicos. MÉTODOS: foram selecionadas as telerradiografias pré- e pós-cirúrgicas (seis meses) de 25 pacientes face longa submetidos a cirurgia ortognática combinada. Foram realizados os traçados de previsão manual e computadorizados de cada paciente, comparando-os, cefalometricamente, com os resultados pós-cirúrgicos. Esse protocolo foi repetido para avaliação do erro do método e realizou-se a avaliação estatística por meio da análise de variância e sobreteste de Tukey. RESULTADOS: observou-se uma maior frequência de variáveis cefalométricas que não diferiram estatisticamente do resultado pós-cirúrgico real para o método manual, seguido dos programas DFPLus e Dolphin; observando-se valores cefalométricos similares para a maioria das variáveis. CONCLUSÃO: concluiu-se que o método manual pareceu mais fidedigno, embora a previsibilidade dos métodos avaliados (computadorizados e manual) tenha se mostrado razoavelmente satisfatória e similar.

Vantagens e limitações da técnica de frenulectomia à laser Er: Yag / Advantages and limitations of the technique of frenulectomy to laser Er: Yag

Os frênulos labiais são inserções de tecido conjuntivo fibroso e têm como função limitar os movimentos do lábio, promovendo sua estabilização e impedindo a excessiva exposição da mucosa gengival na área de sua inserção. Entretanto, os frênulos podem exercer funções adversas, sendo indicada sua remoção cirúrgica por motivos periodontais, ortodônticos, protéticos e estéticos. Este trabalho tem como objetivo discutir a frenulectomia com uso do laser Er: Yag, comparando suas vantagens e limitações em relação às técnicas de frenulectomias convencionais.

The labial frenulum are insertions of fibrous conjunctive tissue and have function of a labial frenulum is to limit movements of the lip, promoting stabilization and to impede the excessive exhibition of the gingival mucosa in the area attachment. However, the frenulum can exercise adverse functions, being indicated its surgical removal by periodontal, orthodontics, prosthetic and aesthetic reasons. This paper aim objective to discuss the frenulectomy with use of the laser Er:Yag, comparing its advantages and limitations in relation to the conventional frenulectomy techniques.

Avaliação cefalométrica do perfil mole de pacientes face longa submetidos à cirurgia ortognática: estudo retrospectivo / Cephalometric evaluation of the soft tissue profile in vertical face treated by orthognathic surgery: a retrospective study

OBJETIVO: o presente trabalho propôs-se a comparar o perfil tegumentar pós-operatório de pacientes Classe II, Padrão Face Longa, submetidos ao tratamento ortodôntico-cirúrgico, com os parâmetros descritos na análise cefalométrica de Legan e Burstone. METODOLOGIA: 32 telerradiografias pós-cirúrgicas, com um mínimo de 6 meses de acompanhamento, foram submetidas a traçado manual (repetido 4 vezes) e digitalização (também repetida 4 vezes) no programa DFPlus para análise cefalométrica. RESULTADOS: os resultados permitiram verificar que 9 das 11 medidas avaliadas encontravam-se estatisticamente diferentes da norma avaliada; contudo, ao se verificar o desvio padrão permitido na norma, os achados deste trabalho situam-se dentro da mesma, com exceção do ângulo mentocervical. CONCLUSÃO: as condições experimentais deste estudo permitiram concluir que, embora a população estudada tenha obtido resultados estéticos-funcionais satisfatórios, não se enquadrou nas normas da análise de Legan e Burstone, o que indica que a avaliação após a cirurgia ortognática deve ser principalmente clínica e que a estética facial não está totalmente relacionada com as medidas préestabelecidas na análise cefalométrica.

AIM: to compare the postoperative tegumentar profile of vertical facial growth pattern Class II patients treated by orthognathic surgery approach, in relation with the norms describes in literature on the Legan & Burstone cephalometric analysis. METHODS: thirty two post operatives lateral cephalograms, with a accompaniment minimum of six months was submitted to manual tracing, digitalization on DFplus program and cephalometric analysis. RESULTS: the results indicated that 9 of the 11 available references was statistically different of the norm, although if examine the admitted pattern deviation on the norm, the basis was placed into the same, exception the chin throat angle. CONCLUSIONS: the experimental conditions of this study permit to conclude that although the studied population had obtained satisfactory aesthetic-functional results, the cephalometric values doesn't coincided with that of Legan & Burstone analysis. Therefore, the postoperative results' assessment must be mainly clinical; and the facial esthetic is not whole relationated with preestablished measurements on cephalometrics analysis.

Histologic study of use of microfibrillar collagen hemostat in rat dental sockets

The aim of this paper was to evaluate if the placement of microfibrillar collagen hemostat (MCH) into a dental socket interfered with healing. General anesthesia was administered to 30 adult male Albinus Wistar rats and the maxillary right central incisor was extracted. In the control group after each tooth was extracted, the socket was sutured. In the MCH group after each tooth was extracted, MCH was placed into the socket before suturing. Postoperatively, 5 animals were sacrificed from each group at 7, 21 and 28 days. The right maxilla was removed from each animal and histologic slides were stained with Masson's trichromic and hematoxylin and eosin. Quantitative and qualitative analyses were done. The percentage of bone area in the dental socket was quantified using the Image Lab 98 image analysis system. The bone area formation for the control and MCH groups was: 8.1 percent and 3.3 percent at 7 days, 34.4 percent and 33 percent at 21 days and 41 percent and 41.3 percent at 28 days, respectively. We concluded that MCH interferes with the beginning of dental socket healing but does not interfere with the final healing of the dental socket