Mamidi Deepika, Vasa Aron Arun Kumar, Sahana Suzan, Done Vasanthi, Pavanilakshmi Siragam
Department of Pedodontics and Preventive Dentistry, St. Joseph Dental College, Eluru, Andhra Pradesh, India.
Contemp Clin Dent. 2020 Jan-Mar;11(1):34-38. doi: 10.4103/ccd.ccd_320_18. Epub 2020 Jul 13.
Golden proportion is a constant ratio that exists in nature, responsible for the esthetic appeal of parts in the human body. The study was aimed to assess the existence of golden proportion in primary dentition by evaluating the average width and height ratio of maxillary anterior teeth.
A total of 200 children comprising equal number of males and females aged 3-7 years with all deciduous teeth present were randomly selected. Each participant was photographed with head upright and occlusal plane parallel to floor. Distance between the participant and camera was fixed at a working distance of 60 cm. The digital images were analyzed using imaging software (Adobe V7), the perceived widths of maxillary laterals were divided by widths of central incisor and that of canines were divided by perceived widths of lateral incisor. Maxillary arch impressions were made and casts prepared. Measurement of each anterior tooth was done using digital calipers. The measured width of lateral incisor was divided by width of central incisor and that of canine was divided by measured width of lateral incisor. Perceived and measured widths were tabulated separately.
The mean measured lateral incisor-to-central incisor ratio was 0.80. The mean measured canine-to-lateral incisor ratio was 1.32. The mean perceived lateral incisor-to-central incisor ratio was 0.75. The mean perceived canine-to-lateral incisor ratio was 0.90. The mean measured width-to-height ratio of central incisors was 1.14. The mean perceived width-to-height of central incisors ratio was 1.08. No significant statistical difference was observed between measured widths, perceived widths, measured width-to-height ratio, and perceived width-to-height ratios for both the sexes. There was strong correlation between these ratios and golden ratio (0.62).
The study revealed that the golden proportion was inconsistent in terms of relative tooth width in primary dentition.
黄金比例是自然界中存在的一个恒定比例，它赋予人体各部分美学吸引力。本研究旨在通过评估上颌前牙的平均宽度与高度比，来评估乳牙列中黄金比例的存在情况。
随机选取200名3至7岁的儿童，男女数量相等，且乳牙全部萌出。每位参与者头部直立，咬合平面与地面平行时进行拍照。参与者与相机之间的距离固定为60厘米的工作距离。使用成像软件（Adobe V7）对数字图像进行分析，将上颌侧切牙的感知宽度除以上颌中切牙的宽度，将尖牙的宽度除以上颌侧切牙的感知宽度。制取上颌牙弓印模并制作模型。使用数字卡尺测量每颗前牙。将测量得到的侧切牙宽度除以上颌中切牙的宽度，将尖牙的宽度除以上颌侧切牙的测量宽度。分别将感知宽度和测量宽度制成表格。
测量得到的侧切牙与中切牙平均宽度比为0.80。测量得到的尖牙与侧切牙平均宽度比为1.32。感知到的侧切牙与中切牙平均宽度比为0.75。感知到的尖牙与侧切牙平均宽度比为0.90。测量得到的中切牙宽度与高度平均比为1.14。感知到的中切牙宽度与高度平均比为1.08。男女在测量宽度、感知宽度、测量宽度与高度比以及感知宽度与高度比方面均未观察到显著的统计学差异。这些比例与黄金比例之间存在强相关性（0.62）。
该研究表明，在乳牙列的相对牙宽度方面，黄金比例并不一致。
