Does the maxillary anterior ratio in Korean adults follow the Golden Proportion?

Abstract

PURPOSEThe purpose of this study was to determine the effect of changes in the horizontal plane angle on the mesiodistal width ratios of the maxillary anterior teeth during the acquisition of frontal view photographs, derive these ratios for Korean adults on the basis of the data obtained, and analyze them using the Golden Proportion as a reference.MATERIALS AND METHODSIn experiment I, 30 plaster casts were mounted on an articulator and positioned on the angle-measuring device with a center setting of 0°. The device was rotated to 10° in 1° increments in a counterclockwise direction. At each angle, photographs were obtained and analyzed. Experiment II was based on 60 patients who visited the Department of Prosthodontics at Kyungpook National University Dental Hospital from February 2012 to February 2015. The patients were divided into three groups [Male (M), Female (F), Total (M + F)]. Frontal views were obtained for all groups and analyzed.RESULTSFrom 1° to 10°, the relative mesiodistal width ratios for the maxillary anterior teeth showed no significant differences from those at 0°. In all three groups, the relative width ratio of the maxillary central incisor was smaller than that specified in the Golden Proportion; the opposite was true for the canine.CONCLUSIONOur results suggest that the mesiodistal width ratios of the maxillary anterior teeth do not follow the Golden Proportion in Korean adults, and that a change in the horizontal plane angle from 1° to 10° during frontal photography does not affect these ratios.

Natural upper anterior teeth display an increasing proportion in mesio-distal direction

“…In addition, it was first used for calculating the relationship of successive width of the anterior teeth and a corresponding smile (6,7). However, earlier studies have shown that the width of anterior natural teeth does not correspond to the golden proportion (8)(9)(10)(11)(12)(13)). Preston's proportion and RED were thus introduced as alternates for the golden proportion, despite the difference of their reported values (6,10).…”

Evaluation of “Golden Proportion” in Saudi individuals with natural smiles

“…The GP has been investigated and mentioned extensively in the dental literature (Levin, 1978, Preston, 1993, Qualtrough and Burke, 1994, Snow, 1999, Rosenstiel et al, 2000, Ward, 2001, Javaheri and Shahnavaz, 2002, Mahshid and Khoshvaghti, 2004, Simon, 2004, Hasanreisoglu et al, 2005, Ali Fayyad et al, 2006, Murthy and Ramani, 2008, Petricevic et al, 2008, Nikgoo et al, 2009, Chander et al, 2012, Pini et al, 2012, Meshramkar et al, 2013, Rossetti et al, 2013, Forster et al, 2013, Al-Marzok et al, 2013, Calçada et al, 2014, Sandeep et al, 2015, Jin et al, 2016, Bragatto et al, 2016, Kanaparthy et al, 2016, Koidou et al, 2018, Parciak et al, 2017, Al-Kaisy and Garib, 2017). It has been considered by many researchers as the most harmonious recurrent tooth-to-tooth ratio that occurs more consistently in aesthetically pleasing smiles (Richardson and Malhotra, 1975, Levin, 1978, Ward, 2001, Marquardt, 2002) and has long been proposed as an aesthetic guideline for restoring and replacing maxillary anterior teeth (Richer, 1971, Rosenstiel et al, 2001, Levin, 2011).…”

Analysis of the width ratio and wear rate of maxillary anterior teeth in the Korean population

“…Richetts5 reported that the golden ratio was useful for aesthetic restoration of the maxillary anterior teeth. However, previous reports have stated that the golden ratio was not readily observed in maxillary anterior teeth 67891011121314. In 1993, Preston6 reported that only 17% of maxillary anterior teeth met the golden ratio.…”