A Study of the shade of between maxillary and mandibular anterior teeth in the Korean

Purpose: The purpose of this study was to spectrophotometrically evaluate the shade difference between of maxillary and mandibular anterior teeth in the Korean by the standard of vita classical shade guide using $SpectroShade^{TM}$. Material and methods: In this study, the shades of healthy anterior teeth were examined and analyzed using the digital shade analysis of $SpectroShade^{TM}$. This study examined 80 individuals in their twenties, thirties, fourties, fifities ages and 40 males and 40 females, presenting 12 healthy, unrestored maxillary and mandibular anterior teeth. Tooth brushing and oral prophylaxis were performed prior to evaluation. The $SpectroShade^{TM}$ was used to acquire images of the 12 maxillary and mandibular anterior teeth. These images were analyzed using $SpectroShade^{TM}$ Software, and shade maps of each tooth were acquired. The shade difference of upper and lower, and gender differences and ages difference were investigated and analyzed with CIE $L^{*}a^{*}b^{*}$ color order system. One-Way ANOVA test was used to find out if there were significant differences between groups tested and Sheffe multiple comparison was used to identify where the differences were. Results: 1. Shade differences were significant (P < .05) between maxillary and mandibular central incisor, lateral incisor, canine. 2. No significant differences in shade distribution were seen between lateral incisors and central incisors. 3. Canine's shade difference were more significant than central incisor's and lateral incisors's. 4. No significant differences in shade distribution were seen between genders in maxillary and mandibulr central incisor, lateral incisor, canine. 5. No significant differences in shade distribution were seen in order of years in maxillary and mandibulr central incisor, lateral incisor, canine. Conclusions: The results of this study show that 1. Shade difference was founded in maxillary and mandibular anterior teeth and ${\Delta}E^{*}$ value was more than 2.0. 2. Canine's shade difference were more significant than central incisor's and lateral incisors's and between central incisors and lateral incisors shade differences were no significant. 3. No significant differences in shade distribution were seen between genders in maxillary and mandibular anterior teeth. 4. No significant differences in shade distribution were seen in order of years grade in maxillary and mandibular anterior teeth.

한국인의 상하악 전치부 색조에 관한 연구

연구목적: 본 연구에서는 한국인의 상하악 전치부간의 색조차이를 상하악 치아 순면의 정중부의 색조를 분광측색장치 (Spectrophotometer)를 이용하여 CIE $L^{*}a^{*}b^{*}$ 색체계로 비교분석을 하여, 실제 한국인의 상하악 전치부간의 색조차이에 관하여 알아보고 자 하였다. 연구대상 및 방법: 수복물이 없으며 치주적으로 건강한 정상적인 치관부의 형태의 상하악 12전치를 가진 20대, 30대, 40대, 50대 이상 10명씩 남녀 각 40명씩 총80명을 대상으로 색조 측정을 시행하였다. 연구재료: $SpectroShade^{TM}$ MICRO (MHT S.p.A., Italy) 디지털 색조 분석 기구로서 대상 치아의 디지털 영상을 채득하여 이를 기계 내에 포함된 색조 분석시스템을 통해 shade map의 형태로 입력 분석하여 주는 장치이다. 결론: 1. 전치부 상, 하악 치아간 색조차이는 중절치, 측절치, 견치 모두에서 ${\Delta}E^{*}$가 보다 큰 것으로 나타났다. 2. 상, 하악 견치 간 색조차이는 중절치, 측절치 간의 색조차이보다 더 두드러지고 중절치간 측절치간 색조차이 정도는 유사한 것으로 나타났다. 3. 남녀 성별에 따른 상, 하악 치아 간의 색조차이는 그 정도가 유사한 것으로 나타났다. 4. 각 연령대에 따른 상, 하악 치아간 색조차이의 정도는 연령대와 상관없이 유사한 것으로 나타났다.