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Shade analysis of anterior teeth using digital shade analysis system Digital Shade Analysis System을 이용한 전치부의 색조 특성에 관한 연구
Hee-Eun Kim, In-Ho Cho, Ju-Hwan Lim, Hun-Song Lim
김희은, 조인호, 임주환, 임헌송

Statement of problem : A scientific examination and understanding of overall aspects of the
natural dentition is the first step involved in making a satisfactory selection in the shade of an
aesthetic prosthesis. Proper natural shade selection of the prosthetic restoration that is in har-
mony with the remaining dentition is as important aesthetically, as harmony of form and func-
tion in the anterior dentition. Clinically, the most commonly applied method of shade selection
has been visual, but because of the subjective nature inherent to this method, shade selection results
are variable and can be influenced by such factors as the technician, the type of shade guide used,
and the type and intensity of the lighting.
Purpose : The purpose of this study was to develop a more objective and scientific approach
to examining and understanding the shade of teeth, which has in turn lead to the development
of a number of shade analysis devices that present a more objective method of shade analysis.
Material and Method : In this study, the shades of healthy anterior teeth were examined
and analyzed using the recently developed digital shade analysis of the ShadeScanTM System. The
study  examined  80  individuals  in  their  twenties,  40 males  and  40  females,  presenting  6
healthy, unrestored maxillary anterior teeth. Tooth brushing and oral prophylaxis were performed
prior to evaluation. The ShadeScan handpiece was used to acquire images of the 6 maxillary ante-
rior teeth. These images were analyzed using the Vita/Classical mode of the ShadeScanTM Software,
and shade maps of each tooth were acquired and divided into cervical, middle, and incisal thirds.
The shade distribution of each third, left and right symmetry, and gender differences were inves-
tigated and analyzed.
Results : The results of the study are as follows:
1. An overwhelming majority of the examined teeth were found to possess shades belong to Group
A, with the greatest variations occurring at the middle and cervical thirds of the maxillary
central and lateral incisors, in both male and female subjects.
2. Canines of both male and female subjects showed left and right symmetry with uniform shade
distribution of A4 and C4, while the lateral and central incisors showed left-right symmetry
of the incisal 1/3 with a uniform shade distribution of A2 and A3 shades.
3. No significant differences in shade distribution were seen between genders in maxillary canines,
whereas maxillary central and lateral incisors showed differences at the middle and cervical
thirds between male and female subjects.
The results of this study show that with the exception of maxillary canines, maxillary anteri-
or teeth display a diverse shade distribution as well as gender differences.
Conclusion : Clinically, when making a shade selection using the existing shade guide, one
must consider the fact that even a single tooth consists of a variety of shades. The results of this
study show that when selecting a shade from a number of groups is difficult, shades from A group
are the most consistent with the natural shade of maxillary anterior teeth.

* Keywords: Shade selection, ShadeScan™ system, Shade distribution, Satisfactory selection, Digital shade analysis

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