Shade guide의 형태가 색상 결정에 미치는 영향

박걸,김동준,이시은,황윤찬,오원만,황인남 大韓齒科保存學會 2005 Restorative Dentistry & Endodontics Vol.30 No.3

This study was conducted in order to assess whether the form of the shade guide affects in deciding the color of the teeth using the shade guide. Eight shade light cured composite resins (Esthet-X, Dentsply, Milford, USA) were used in this study. Shade guides including the model of maxillary central incisors, teeth-form shade guide, doughnut form shade guide, and shade guide with perforated gray shield were prepared with eight shade composite resins and provided the codes randomly. After arranging the models of teeth, 19 dentists working at the clinic of the Dentistry of Chonnam University Hospital and 65 students of college of dentistry, Chonnnam University selected the shade guides corresponding to the color of each tooth on the gray board under the D_(65) standard illuminant. Bl shade showed highest accuracy of about 95% among all shade guides of 3 forms applied to the test and regardless of observer, tooth form shade guide showed the highest accuracy (p < 0.05) , and the doughnut form showed the lowest accuracy (p < 0.05). At the time of deciding on the color of the teeth using the shade guides as a result of above, the forms of the shade guides can affect the accuracy, and it suggests that the development of the diversified forms of shade guides, which may obtain more accurate results, is required. 본 연구에서는 shade guide를 이용하여 치아의 색상을 결정하는데 있어 shade guide의 형태가 미치는 영향을 평가 하기 위해 시행하였다 8가지 서로 다른 색상 code (Al, A2, Bl, B2, B3, C2, C3, D3)를 사용하는 광중합 복합레진 (Esthet-X, Dentsply, USA)을 이용하여 각 색상마다 상악 중절치 모형, 치아형 shade guide, 도넛형 shade guide, 및 회색 shield를 포함하는 shade guide를 제작하고 무작위로 기호를 부여하였다. 제작된 치아 모형을 배열하고 전남 대학교병원 치과 진료처에 근무하는 19명의 수련의와 전남대학교 치과대학 2, 3학년 학생 65명을 대상으로 회색 배경 판과 D_(65) 표준광 하에서 각 치아의 색상과 일치하는 shade guide를 선택하게 하였다. 연구 결과 Bl 색상은 실험에 적용한 3가지 형태의 모든 shade guide에서 약 95%의 가장 높은 정확도를 보였으며 , 색상간 색차가 가장 적은 B2와 C2는 3가지 형태의 모든 shade guide에서 서로 비슷한 정도의 교차 선택율을 보였다. 또한 관찰자에 상관없이 치아 형태의 shade guide는 가장 높은 정확도를 보인 반면 (p < 0.05), 도넛 형태의 shade guide는 가장 낮은 정확도를 보였다 (p <0.05)

치과 종사자간의 색조 식별 능력

김자영,이임기,윤태호,안승근,박찬운,Kim Ja-Yeong,Lee Im-Gi,Yoon Tae-Ho,Ahn Seung-Geun,Park Charn-Woon 대한치과보철학회 2006 대한치과보철학회지 Vol.44 No.4

Statement of problem: Many factors influence shade determination in clinical practice and shade matching is highly affected by the viewing conditions. Purpose : This study investigated the differences in shade perception among distinct groups of dental personnel (10 prosthodontists, 10 general practitioners, 10 last-year dental students and 10 dental technicians) Material and method: Four groups of dental personnel were investigated. They were tested to eliminate color blindness. To compare shade selection ability, they were asked to match four test tabs of shades A3, B2, C2 and D4 (VITAPAN$^{(R)}$ Classical shade guide. The identification codes of the shade tabs were masked to prevent shade memory. ) against another full set of VITA$^{(R)}$ PAN$^{(R)}$ Classical shade guide under similar lighting conditions. Shade selections were randomly repeated five times every week and then the repeatability between dental personnel was evaluated. To compare value perception ability, they were asked to arrange randomly selected five test tabs (Bl, A2, D2, C3, A4) in descending order from the brightest to the darkest. To compare hue determination ability, they were asked to divide selected eight test tabs (n, A3, B2, B3, C2, C3, D2, D3) into four groups by manufacturer as follows : Group A-Reddish brown, Group B-Reddish yellow. Group C-Grey. Group D-Reddish grey. Results and conclusion : The obtained results were as follows : 1. For the value perception ability and hue determination ability. there was no significant difference among 4 groups: prosthodontists, general practitioners, dental students, dental technicians (P>.05). 2. For shade selection ability, the prosthodontists and dental technicians were significantly higher than dental students(P<.05). 3. The repeatability of selected shade in the dental technicians was significantly higher than that of general practitioners and dental students(P<.05). 4. The prosthodontists and dental technicians had significantly higher selection ability than dental students for shade B2 (P<.05).

Proposal for a gingival shade guide based on in vivo spectrophotometric measurements

Cristina Gomez Polo,Javier Montero,Ana Maria Martin Casado 대한치과보철학회 2019 The Journal of Advanced Prosthodontics Vol.11 No.5

PURPOSE. The purpose of this study was to propose and assess a shade guide for pink gingival aesthetics using a Spanish population sample. MATERIALS AND METHODS. The L*, C*, h, a* and b* coordinates of 259 participants were measured using a spectrophotometer in 3 standardized points along the attached gingiva of the maxillary central incisors. A hierarchical clustering analysis was applied to obtain separate solutions regarding the number of shade tabs. For each of the solutions obtained, color differences (ΔE*) were calculated using the CIELab and CIEDE2000 formulas, and the proposed shade guide was selected considering (1) the color differences between tabs and (2) the coverage error of each of the solutions. RESULTS. The proposed shade guide consisted of 8 gingival shade tabs and achieved CIELab and CIEDE2000 coverage errors of less than the respective 50:50% acceptability thresholds (ΔE*=4.6 units and ΔE00=4.1). The coordinates for the various gingival shade tabs were as follows: Tab 1: L*43.3, a*21.9, b*12.3 (1.6); Tab 2: L*42.9, a*34.1, b*19.1; Tab 3: L*46.5, a*25.8, b*10.9; Tab 4: L*46.5, a*27.3, b*15.1; Tab 5: L*49.6, a*23.5, b*16.8; Tab 6: L*51.5, a*19.7, b*13.6; Tab 7: L*55.9, a*22.0, b* 15.0; and Tab 8: L*56.0, a*19.9, b*18.8. CONCLUSION. The CIELab and CIEDE2000 coverage errors for the 8 shade tabs of the proposed gingival shade guide were significantly lower than those of other guides. Therefore, despite the limitations of this study, the proposed guide is more appropriate for matching gingival shade in the Spanish general population.

A Study on Color Differences Between Composite Resins and Shade Guides

Kim, Hee-Sun,Um, Chung-Moon,Kahng, Myong-Whai 大韓齒科保存學會 1996 Restorative Dentistry & Endodontics Vol.21 No.1

복합레진의 광중합 전ㆍ후와shade guide의 색차 비교

엄정문,조성식,전이주 大韓齒科保存學會 1999 Restorative Dentistry & Endodontics Vol.24 No.2

ShadepilotTM을 이용한 색조 선택

신수연 대한턱관절교합학회 2007 구강회복응용과학지 Vol.23 No.2

- ABSTRACT - Clinical Color Match using ShadepilotTM Soo-yeon Shin Department of Prosthodontics, School of Dentistry, Dankook University The ability of a dentist to select and communicate an acceptable shade match to a dental laboratory may be the most important factor in esthetic restorative dentistry. However, shade matching is a very complex situation. In this study, an attempt was made to compare and evaluate the conventional visual assessment and colorimetric analysis in clinical shade matching. 20 patients were selected and their maxillary central incisors shade were measured by Vita classic shade guide, using ShadepilotTM and ShadeEye NCC. The results indicate that there is much variation in the shade selection by visual and instrumental methods.

자연치와 도재관에 대한 색조선택의 동일성

조홍규 대한치과기공학회 2007 대한치과기공학회지 Vol.29 No.1

자가미백술 단독사용시 임상적 효능 및 유지력 평가

신병규,양성은 大韓齒科保存學會 2010 Restorative Dentistry & Endodontics Vol.35 No.5

연구목적; 본 연구는 15% 과산화 요소 (carbamide peroxide)를 포함한 Opalescence F를 이용한 자가 미백숨 (home bleaching) 을 4주간에 걸쳐 시행한 후 12주까지 임상적 미백효과와 구강 환경에서 임상적 미백 효과의 유지 정도를 비색 측정기 (Colorimeter) 와 비타 색 기준 (Vita shade guide)을 이용하여 알아보고자 하였다. 연구 재료 및 방법: 28명의 336개의 전치를 대상으로 실험군은 하루 2시간씩 4주간 자가 미백술을 시행하고 대조군은 미백을 시행하지 않았다. 미백 전, 미백 직후(4주후), 8주, 12주에 색을 측정하여 변화를 기록하였다. 결과: 4주의 미백술 시행 후 치아의 색 변화량 (△E)은 실험군에서 비색 측정기는 7.04 ± 2.85. 비타 색 기준은 7.58 ± 2.28로 모두 뚜렷한 변화를 나타냈으며 (p <0.05).8주와 12주후의 색 변화량 (△E*)은 미백과는 상반되는 방향으로 비색 측정기의 경우에는 8주에 2.71 ± 1.84. 12주에 2.19 ± 2.59로 나타났으며 비타 색 기준의 경우는 8주에 0.41 ± 1.21. 12주에 1.05 ± 1. 3 6으로 나타나, 비록 미백전과의 유의할 만한 차이를 보였지만 (p <0.05) 미백직후와 비교 시 서서히 색이 복원 (shade recover)되 는 경향을 보였다. 이러한 색의 복원은 미백치료 종료 후 초기에 상대적으로 많은 변화를 보인 후 시간이 지남에 따라 변화가 줄어들며 안정되는 양상을 보였고 CIE Lab* 값은 미백 시행 기간동안 밝기 (L*값) 는 증가하였고 적-녹 축 (red-green축 . a*값) 은 감소하여 녹색계통으로 변화되며, 황-청 축 (yellow-blue축. b*값) 도 감소하여 청색계통으로 변화하였고 미백 시행을 종료한 후에는 미백 시행 이전방향으로 색 복원이 발생하였다. 비색 측정기는 비타 색 기준에 비해 보다안정적인 결과를보였으며 육안에 의존하는비타색 기준은큰변화는더 크게, 작은변화는더 작은색 변화량을 보였다. 결론: 자가 미백술 단독 사용시 색복원은 관찰되지만 12주후에 도 미백전과 비교시 통계학 상으로 유의성있게 그 효과가 유지되므로 (p <0.05) 임상적 효능이나 유지력은 인정되며 이를 통해 자가미백술 단독 사용으로도 그 의미는 있다고 생각된다. Objectives: The purpose of this study was to evaluate the whitening efficacy and longevity of home bleaching. Materials andMethods: A total of 28 patients were divided into either experimental group (Opalescence F: 15% carbamide peroxide) or control group randomly. The patients in experimental group were instructed to wear individual trays applied with bleaching gel for 2 hours a day for 4 weeks. Any treatments weren't applied to the patients in control group. The color measurements of central incisors, lateral incisors & canines of upper and lower arch were recorded at base line, immediately after the finishment of treatmemt (4 weeks), 8 weeks and 12 weeks using Colorimeter (Chroma Meter, 2600d Konica Minolta co.) and Vitapan classical shade guide (Vita Zahnfabrik). Results: A significantly stronger color change was observed for overall teeth samples in experimental group immediately after treatment (at 4 weeks) compared to ones in control group (p <0.05). There was also a significant difference between baseline and 8 weeks or 12 weeks separately though color rebouncing phenomenon occurred as time went by (p <0.05). Conclusions: The clinical effecacyand longevity of home bleaching without combined application of in-office bleaching was observed through this experiment.

치과용 Ni-Cr 합금의 조성에 따른 세라믹의 색차 분석

김사임,김태연,김세하,강정규,이정환 대한치과기공학회 2021 대한치과기공학회지 Vol.43 No.4

Purpose: This study was conducted to investigate alloys spectrophotometrically including yttrium of nickel-chromium (Ni-Cr) alloys, which are used as substitutes for the regulation of beryllium and provide helpful improvements in Ni-Cr alloys. Methods: Four groups of specimens (ZN, ZY, SN and EM) were prepared for analysis. Color parameters were measured with a spectrophotometer, and color difference (ΔE*) was calculated. The t-test and one-way analysis of variance test were used to determine significant difference, and the Tukey test was used to identify where the differences were. To measure the spectroscopic reflectivity, the spectroscopic reflectance was measured and converted into CIE L*, a*, b* color system. Results: The ΔE* value of each metal ceramic group after opaque firing of Ni-Cr alloy with and without yttrium was <2, and the total group color difference (ΔE*) was below 1 in the dentin ceramic all experimental group. However, the a* and b* values of the metal ceramic groups were higher than that in the lithium disilicate all ceramic group, and the chroma was higher than the natural tooth. The brightness of all experimental groups was similar to that of the shade guide sample. Conclusion: Yttrium added to Ni-Cr alloys showed similar CIE L*, a*, b* values to Ni-Cr alloys that did not contain yttrium, indicating that yttrium had no effect on color in metallic ceramic systems.

2.6% 및 2.9% 과산화수소를 배합한 치아부착대의 치면색조변화 효과 및 안전성에 관한 실용 실험연구

이병진 ( Byoung Jin Lee ),배광학 ( Kwang Hak Bae ),노정 ( John Noh ),백대일 ( Dai Il Paik ),김종배 ( Jhong Bai Kim ) 대한구강보건학회 2004 大韓口腔保健學會誌 Vol.28 No.1