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Abstract(s)
Introdução: A tentativa de estabelecer um padrão geométrico do sector anterior maxilar é algo que já é feito há muito tempo. A Proporção Dourada, a Proporção de Preston, a Percentagem Dourada, a Proporção “Recurring Esthetic Dental” (RED), e mais recentemente a “Proportion Gauge” são teorias que tentam aplicar relações matemáticas e geométricas procurando estabelecer um padrão de normalização de canino a canino. O objectivo desta investigação é avaliar se alguma destas teorias pode ser considerada como referência na reabilitação do sector anterior maxilar, numa amostra populacional portuguesa.
Material e métodos: De um total de 294 pacientes observados, foram seleccionados 50 pacientes de acordo com os critérios de inclusão definidos, aos quais foi efectuada uma recolha fotográfica do sector anterior maxilar superior. A partir destas imagens e recorrendo ao programa Adobe Photoshop CS5.1, foi feita uma análise antropométrica dos seis dentes anteriores maxilares e os dados recolhidos foram analisados estatisticamente através do software IBM SPSS Statistics, v.20.
Resultados: As variáveis largura e altura são concordantes com os valores médios descritos pela literatura e por consequência inserem-se na “Proportion Gauge” mas, contudo, ultrapassam o valor recomendado de 78% para a relação largura/altura que Stephen Chu preconiza. No que diz respeito à proporção entre as larguras dos seis dentes anteriores maxilares, verificou-se que não se mantém constante nem vai de encontro com os valores propostos na Proporção Dourada e na Proporção RED. Relativamente à Proporção de Preston esta verificou-se na amostra populacional estudada e, no que diz respeito à Percentagem Dourada, os valores observados neste grupo estão próximos dos defendidos pela teoria.
Conclusão: Na amostra populacional estudada é possível concluir que os valores médios da largura e da altura obtidos vão de encontro com a literatura e deste modo com os valores sugeridos na Proportion Gauge. A diferença entre estes valores nos dois géneros é estatisticamente significativa e deverá ser considerada na reabilitação oral. Relativamente às proporções da dentição natural estudadas, apenas se verificou a Proporção de Preston.
Palavras-chave: estética dentária, dentisteria cosmética, proporção dourada, proporção de preston, percentagem dourada, proporção red, informática dentária, fotografia dentária
Summary: The attempt to establish a geometrical pattern of the anterior maxillary sector has been done for a long time. The Golden Proportion, Preston's Percentage, Golden Percentage, Recurring Esthetic Dental (RED) Proportion and, most recently, Gauge Proportion are theories that try to apply mathematical and geometrical relations, searching for a normalization pattern from canine to canine. The objective of this investigation is to evaluate if any of this theories can be considered as reference in rehabilitation the anterior maxillary sector, in a portuguese populational sample. Materials and Methods: From a total of 294 observed patients, 50 were selected, according to defined inclusion criteria, which were subjected to a photographic collection of their anterior sector of the superior maxilla. Through these images and Adobe Photoshop CS5.1 software, the six anterior maxillary teeth were subjected to an anthropometric analysis, and the data obtained were statistically analysed through IBM SPSS Statistic v.20 software. Results: The width and height variables are concordant with the medium values described by literature and, consequentely, are inserted in the Gauge Proportion, however, they are above the recommended value of 78% for the width/height relation that Stephen Chu advocates. Considering the proportion between the width of the six anterior maxillary teeth, it is not stable nor does it go accordingly to the figures proposed by the Golden Proportion and RED Proportion. Regarding the Preston Proportion, it was confirmed in the studied population and, regarding the Golden Proportion, the values observed in this group are close to those defended by this theory. Conclusion: In the studied population sample, the medium width and height results are coincident with literature, and are hence according to the figures suggested in Gauge Proportion. The difference between these figures in the two genres is statistically significative, and should be considered during oral rehabilitation. Regarding the studied proportions in natural dentition, only Preston Proportion was verified. Key-words: dental esthetics, cosmetic dentistry, golden proportion, golden percentage, recurring esthetic dental proportions, dental informatics, dental photograp
Summary: The attempt to establish a geometrical pattern of the anterior maxillary sector has been done for a long time. The Golden Proportion, Preston's Percentage, Golden Percentage, Recurring Esthetic Dental (RED) Proportion and, most recently, Gauge Proportion are theories that try to apply mathematical and geometrical relations, searching for a normalization pattern from canine to canine. The objective of this investigation is to evaluate if any of this theories can be considered as reference in rehabilitation the anterior maxillary sector, in a portuguese populational sample. Materials and Methods: From a total of 294 observed patients, 50 were selected, according to defined inclusion criteria, which were subjected to a photographic collection of their anterior sector of the superior maxilla. Through these images and Adobe Photoshop CS5.1 software, the six anterior maxillary teeth were subjected to an anthropometric analysis, and the data obtained were statistically analysed through IBM SPSS Statistic v.20 software. Results: The width and height variables are concordant with the medium values described by literature and, consequentely, are inserted in the Gauge Proportion, however, they are above the recommended value of 78% for the width/height relation that Stephen Chu advocates. Considering the proportion between the width of the six anterior maxillary teeth, it is not stable nor does it go accordingly to the figures proposed by the Golden Proportion and RED Proportion. Regarding the Preston Proportion, it was confirmed in the studied population and, regarding the Golden Proportion, the values observed in this group are close to those defended by this theory. Conclusion: In the studied population sample, the medium width and height results are coincident with literature, and are hence according to the figures suggested in Gauge Proportion. The difference between these figures in the two genres is statistically significative, and should be considered during oral rehabilitation. Regarding the studied proportions in natural dentition, only Preston Proportion was verified. Key-words: dental esthetics, cosmetic dentistry, golden proportion, golden percentage, recurring esthetic dental proportions, dental informatics, dental photograp