Influential factors of esthetic evaluation of axial dental midline angulation / 中华医学美学美容杂志

Objective To explore the related factors that might had effect on orthodontic patients' esthetic evaluation of axial dental midline angulation from three aspects which are ideal value,detectable value and tolerable value.Methods Photographs of a smiling woman was digitally manipulated to produce models with left or right maxillary axial dental midline angulations in 2° increments.These digital photographs models were used to develop an electronic questionnaire in combination with corresponding guidance for each question.The electronic questionnaire was applied to investigate the esthetic evaluation of axial dental midline angulation from 222 orthodontic patients who complied with the inclusion criteria.Esthetic evaluation included three aspects,the ideal value,the detectable value and the tolerable value,which represented the degrees of maxillary axial dental midline angulations the patients considered to be ideal,detectable and tolerable,respectively.The patients' personal information and clinical orthodontic examination results were collected as well.Results The mean detectable value and tolerable value were 4.9° and 9.7°,the median of detectable value and tolerable value were 5°and 9.5°.Logistic regression analysis was applied to explore the influence of seven factors on each evaluator's ideal value,detectable value and tolerable value.The seven factors were gender,marriage condition,education level,orthodontic treatment condition,malocclusion index,dental esthetic rating from others and from themselves.The statistical analysis indicated education level and orthodontic treatment condition were the influential factors of detectable values,while the tolerable values were influenced by the education level and gender.The ideal value converged to 0° and none of the factors had effect on it.Conclusions The education level,orthodontic treatment condition and gender are considered to be the influential factors of the esthetic evaluation of axial dental midline angulation.

Correlation of Facial to Dental Midline And Maxillary to Mandibular Midline In Karnataka Population.

The coincidence of dental midline between the maxillary and the mandibular teeth, and the coincidence of dental midline with the facial midline is an important factor governing esthetics. AIM -The present study was planned to evaluate the relation between facial midline and dental midline and the relation between maxillary and mandibular midline in Karnataka population. METHODOLOGY -The present study was conducted on 400 Indian male and female individuals of 18-40 years of age group. Trubyte indicator was used to co-relate the midlines. RESULTS- The maxillary midline was coinciding with facial midline in 290 subjects (72.5%). The mandibular midline was coinciding with the facial midline in 169 subjects (42.2%). The mandibular midline was coinciding with maxillary midline in 127 subjects (31.7%). CONCLUSION- From the present study and various literature available it is assumed that there is not much difference between Western, European or Asian population in relation to facial midline and dental midline coincidence and in relation to sex.

Comparação do método clínico e radiográfico para determinar o posicionamento da linha média dentária / Comparison of clinical and radiographic methods to determine the dental midline position

Objetivo: Este estudo comparou as medidas referentes às linhas médias dentárias superior e inferior em relação à linha média facial através de dois métodos: exame clínico e exame radiográfico cefalométrico pôstero-anterior. Metodologia: Foram examinados 60 sujeitos leucodermas em fase inicial de tratamento ortodôntico, com idade entre 22 e 30 anos, de ambos os gêneros. Na análise clínica as medidas foram realizadas na linha média dentária superior (LM1) e na linha média dentária inferior (LM2); na análise radiográfica (PA), as medidas foram realizadas entre os incisivos centrais superiores (LM3) e entre os incisivos centrais inferiores (LM4). Os pontos cefalométricos utilizados na radiografia pôstero-anterior foram: Cg, ENA e Pog e na análise clínica foram utilizados como referência os pontos tegumentares da Glabela, centro do filtro do lábio superior e mento. Os dados foram analisados por ANOVA e teste de Tukey. Resultados: As medidas LM1, LM2, LM3 e LM4 não mostraram diferença estatisticamente significante entre si (P>0,05). Conclusão: Pode-se concluir que os dois métodos foram satisfatórios para o diagnóstico do posicionamento das linhas médias dentária superior ou inferior. O método clínico é mais prático e objetivo pela facilidade de mensuração.

Purpose: The present study compared the measurements of the dental midline to the facial median line evaluated by two methods: clinical exam and postero-anterior cephalometric examination. Methods: The sample comprised 60 Caucasian subjects aged between 22 and 30 year-old, males and females, at the beginning of their orthodontic treatment. The dental midline position of the maxillary and mandibular central incisors was assessed according to routine protocols of the Orthodontics clinics. The radiographic measurements ML1 and ML2 were recorded for the maxillary and mandibular teeth, respectively, in relation to the facial median line, and the corresponding measurements ML3 and ML4 were obtained from the clinical evaluation. The cephalometric points used for the postero-anterior radiography were Cg, ENA, and Pog. Clinical exams used glabella, midpoint of philtrum, and mentons. Data were analyzed by analysis of variance and Tukey?s test. Results: The results showed no statistically significant difference among the measurements ML1, ML2, ML3, and ML4 (P > 0.05). Conclusion: Both methods were found to be useful for diagnosing the position of dental midline in relation to facial median line, but the clinical method was more practical and objective.

Quanto de desvio da linha média dentária superior ortodontistas e leigos conseguem perceber? / How much upper midline deviation orthodontist and lay people can note?

OBJETIVOS: avaliar o grau de percepção do desvio de linha média superior e da angulação incisal do arco superior entre ortodontistas e leigos, assim como a influência da visualização clínica do filtro labial como referência morfológica para esse diagnóstico. MÉTODOS: foi utilizada a fotografia do sorriso de um indivíduo do gênero feminino, na qual foram produzidas alterações na linha média dentária, de 1 em 1 milímetro, até 4mm, e na angulação incisal, de 5 em 5 graus, até 15 graus, ambas para o lado esquerdo, com o auxílio de um programa de manipulação de imagens (Adobe Photoshop 7.0®).As imagens obtidas foram recortadas,formando um grupo com e outro sem a visualização do filtro labial e,em seguida,foram organizadas aleatoriamente e avaliadas por 24 ortodontistas e 24 indivíduos leigos com nível superior. RESULTADOS: os resultados obtidos revelaram que os ortodontistas foram capazes de detectar desvios da linha média a partir de 2mm (p < 0,05) e da angulação incisal a partir de 5 graus (p < 0,05), enquanto leigos só detectaram como inaceitáveis desvios a partir de 3 ou 4mm (dependendo da presença do filtro labial na imagem analisada) e 10 graus de alteração angular dos incisivos. A visualização do filtro labial na fotografia influenciou, embora suavemente, somente a avaliação dos examinadores leigos. CONCLUSÕES: conclui-se, portanto, que ortodontistas são mais críticos a pequenas variações da linha média superior e da angulação incisal do que indivíduos leigos,e que a visualização do filtro labial superior tem importância secundária como elemento de diagnóstico do desvio da linha média superior para leigos.

AIM: The present study evaluated the perception degree of the upper midline deviation and crown incisor angulation among orthodontists and lay people, as well as the influence of the labial philtrum visualization as a morphological reference of the facial midline during smile examination. METHODS: in a smile picture taken from a 23 year old female, 10 year after orthodontic retention, changes were made in the upper midline, from 1mm to 4mm, and in the crown incisor angulation, from 5º to 15º, both for left side, using a image manipulation software (Adobe Photoshop 7.0). The pictures were cut out forming a group with and another without the visualization of the labial philtrum. The images obtained were examined by 24 orthodontists and 24 graduated lay people. RESULTS: Results showed that orthodontists were less tolerant to discrepancies of midline than lay people, as well as to changes in the crown incisor angulation. The orthodontists were able to observe midline deviations of 2mm and crown incisor angulation deviations starting from 5º. The lay people examiners considered as unacceptable only midline deviations starting from 3 or 4mm, depending on the labial philtrum visualization, and angulation deviations of the incisor crown starting from 10º. Labial philtrum visualization had influenced only to lay people examiners. CONCLUSIONS: It can be concluded that orthodontists are more critic when examining midline deviations and crown angulation changes than lay people examiners. The visualization of the philtrum has no influence for the orthodontist group, but had slight influence on the lay people examiners.