Restorative Dentistry and Endodontics

The Korean Academy of Conservative Dentistry (대한치과보존학회)
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INFLUENCE OF THE LABIAL SURFACE IRREGULARITY ON THE MEASUREMENT OF THE TOOTH COLOR BY SPECTROMETER

치아 순면 형태가 측색 기기를 이용한 치아 색상 측정 결과에 미치는 영향

  • Choi, Yong-Jin (Dept. of Conservative Dentistry, School of Dentistry, DSRI, Chonnam National University) ;
  • Park, Su-Jung (Dept. of Conservative Dentistry, School of Dentistry, DSRI, Chonnam National University) ;
  • Cho, Hyun-Gu (Dept. of Conservative Dentistry, School of Dentistry, DSRI, Chonnam National University) ;
  • Hwang, Yun-Chan (Dept. of Conservative Dentistry, School of Dentistry, DSRI, Chonnam National University) ;
  • Oh, Won-Mann (Dept. of Conservative Dentistry, School of Dentistry, DSRI, Chonnam National University) ;
  • Park, Byung-Ju (Dept. of Oral Biochemistry, School of Dentistry, DSRI, Chonnam National University) ;
  • Hwang, In-Nam (Dept. of Conservative Dentistry, School of Dentistry, DSRI, Chonnam National University)
  • 최용진 (전남대학교 치과대학 보존학교실, 치의학연구소) ;
  • 박수정 (전남대학교 치과대학 보존학교실, 치의학연구소) ;
  • 조현구 (전남대학교 치과대학 보존학교실, 치의학연구소) ;
  • 황윤찬 (전남대학교 치과대학 보존학교실, 치의학연구소) ;
  • 오원만 (전남대학교 치과대학 보존학교실, 치의학연구소) ;
  • 박병주 (전남대학교 치과대학 구강생화학교실, 치의학연구소) ;
  • 황인남 (전남대학교 치과대학 보존학교실, 치의학연구소)
  • Published : 2007.09.29
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Abstract

The most scientific and reliable method for deciding the tooth color is the instrumental measurement. However, such color measuring instrument shows the difference of the measuring value according to the diversified measuring condition. This study was conducted to evaluate what effect of the labial surface irregularity of the tooth to the result of the color measured by spectrometer. 11 models of the teeth were made by injecting the A2 shade Luxatemp Automix Plus (DMG, Germany) into the impression acquired from 11 adults. Standard disk samples (15 mm diameter, 7 mm thickness) were made with same material. CIE $L^*a^*b^*$ value was measured at the incisal, central, and gingival area of the central incisor, lateral incisor, canine and first premolar using Specbos 2100 (JETI, Germany) spectrometer. Color difference was calculated between labial surface and standard samples. Among all models of the teeth, $L^*\;and\;b^*$ value showed the reducing tendency as they go toward the gingival area, but $a^*$ value showed the increasing tendency. Color difference between model teeth and standard samples showed the most difference at the incisal area, but the gingival area showed the least difference. And the canine showed the least color difference from the comparison of standard sample, and the central incisor showed the highest difference (p < 0.01). Although the visually detectable difference of the measuring value showed notably depending on the type and measured area (p < 0.05), $L^*\;and\;a^*$ value showed notable differences depending more on the measured areas than on the type of the teeth.

본 연구는 치아 순면의 굴곡 정도가 측색기를 이용한 치아 측색 결과에 어떠한 영향을 미치는지 확인하고자 시행하였다. 고른 치열을 가진 20대 성인 11명으로부터 채득한 인상에 A2색상의 임시 금관 제작용 레진 (Luxatemp Automix Plus, DMG, Germany)을 충전하여 치아 모형을 제작하고, 중절치, 측절치, 견치, 그리고 제1소구치의 절단부, 중앙부, 치경부의 색상을 1 mm 직경의 측정구를 가진 Specbos 2100 (JETI, Germany) spectrometer를 사용해 측정하고, 디스크 형태로 제작된 대조군과의 색차를 환산하여 다음의 결과를 얻었다. 모든 치아 모형에서 $L^*$값과 $b^*$값은 절단부에서 치경부로 갈수록 낮아지는 경향을 보이나 $a^*$값은 증가하는 경향을 보였다. 디스크 형태의 대조군과의 색차는 모든 치아의 절단부가 가장 큰 값을 보였으며, 치경부가 가장 작은 값을 보였으며, 견치가 다른 치아들에 비해 디스크 형태의 대조군과 작은 색차를 보인 반면, 중절치가 가장 큰 색차를 보였다 (p < 0.01). 이상의 결과는 본 실험에 적용한 optic-fiber를 통해 색을 측정하는 기기를 치아 측색에 적용하기 위해서는 먼저 일정한 측색 조건의 표준화와 치아와 접촉하는 측정부의 치아 표면의 굴곡을 극복할 수 있는 형태의 개발이 필요함을 시사한다.

Keywords

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