Comparative Study of Smile Analysis by Subjective and Computerized Methods

Abstract

SUMMARYPurpose: This study compared: 1) the subjective analyses of a smile done by specialists with advanced training and by general dentists; 2) the subjective analysis of a smile, or that associated with the face, by specialists with advanced training and general dentists; 3) subjective analysis using a computerized analysis of the smile by specialists with advanced training, verifying the midline, labial line, smile line, the line between commissures and the golden proportion. Methods: The sample consisted of 100 adults with natural dentition; 200 photographs were taken (100 of the smile and 100 of the entire face). Computerized analysis using AutoCAD software was performed, together with the subjective analyses of 2 groups of professionals (3 general dentists and 3 specialists with advanced training), using the following assessment factors: the midline, labial line, smile line, line between the commissures and the golden proportion. The smile itself and the smile associated with the entire face were recorded as being agreeable or not agreeable by the professionals. Results: The McNemar test showed a highly significant difference (p=0.0000) among the subjective analyses performed by specialists compared to general dentists. Between the 2 groups of dental professionals, there were highly significant differences (p=0.0000) found between the subjective analyses of the smile and that of the face. The McNemar test showed statistical differences in all factors assessed, with the exception of the midline (p=0.1951), when the computerized analysis and subjective analysis of the specialists were compared. In order to establish harmony of the smile, it was not possible to establish a greater or lesser relevance among the factors analyzed. INTRODUCTIONEsthetic appearance is extremely subjective and relates to beauty and harmony. Esthetic appearance is also subject to social and cultural factors and age, making In order to define the esthetic rehabilitation of the smile, smile analysis must be assessed in association with the face, taking into consideration the following factors: midline of the smile, labial line, smile line, the line between commissures and the golden proportion.

Determination of the golden proportion and its implications in the esthetic setting of prosthetic teeth in African melanoderm subjects

“…Our results are rather in the sense of the conclusions of Ali Fayyad et al [22] in Jordan, Basting et al [23] in Brazil, Hasanreisoglu et al [24] in Turkey, Mashid et al [25] in Iran and Paris et al [20] in France. These authors have shown that there is no relationship between the arrangement of the anterior teeth and concepts of the golden number, the golden percentage or RED proportion.…”

Existence of golden proportion in maxillary anterior teeth of University of Malaya dental students

“…Wolfart et al (18) concluded that a most attractive range can be identified for the width-to-length ratios and tooth-totooth proportions of maxillary incisors. Basting et al (19) have stated that a smile analysis should be performed in relation to facial features to achieve a most aesthetic smile.…”

Study of the morpho-dimensional relationship between the maxillary central incisors and the face

“…24 The real size of the tooth has been evaluated in the literature and has been seen positively in studies of the "Golden Proportion". 3,4,26 In other studies, these references, based on this "Golden Proportion", would be inconsistent, or valid only for a specific population. 6,8,11 In the present study, no relationship could be observed between the width of the tooth and the distance between the zygomas.…”

“…18,26 General characteristics, such as culture, biotype and personality can and must be taken into consideration for a better esthetic result. 10,25 Perhaps the key to understanding this definition of a pleasant smile would be the awareness that dentition is only part of a larger figure, and must be seen within a set of features.…”