교정치료 시 브라켓 부착 및 제거에 따른 치아색 변화

김석필,황인남,조진형,황현식 대한치과교정학회 2006 대한치과교정학회지 Vol.36 No.2

본 연구는 교정용 브라켓 부착을 위한 레진 접착부위 및 그 인접부위 즉, primer만 도포된 부위의 색변화를 알아보기 위하여 시행되었다. 교정치료를 위해 발치된 60개의 건전한 소구치를 재료로 사용하여 분광측정기로 색을 측정한 후 CIE L*a*b* 색표계로 기록하였다. 20개의 소구치에 광중합형 접착레진으로 브라켓을 부착한 후 부착 전과 제거 후의 색을 측정하였으며 다른 20개의 소구치에는 primer만 도포하고 도포 전과 도포 후의 색을 측정한 후, L* 값을 이용하여 명암 변화를 살펴본 결과 브라켓 부착 및 primer 도포 모두의 경우 명도가 감소하는 경향을 보였으며, a* 값과 b* 값을 이용하여 색상 변화를 살펴본 결과 황색이 증가하는 양상을 나타내었다. 또한 측정된 L*a*b* 값을 이용하여 색변화를 산출하고 임상적으로 인지할 수 있는 색변화 값 3.7을 기준치로 하여 비교 및 분석을 시행한 결과 브라켓 부착 전과 제거 후의 색변화는 기준치보다 큰 것으로 나타났으며 primer 도포에 따른 색변화는 기준치보다 크지 않은 것으로 나타났다. 한편 primer만 도포한 경우 칫솔질에 따른 색변화를 알아보고자 나머지 20개의 소구치를 대조로 하여 칫솔질을 시행한 결과 칫솔질 시행 후 색변화는 기준치보다 큰 것으로 나타났다. 브라켓 제거 후 자연광 노출의 영향을 알아보기 위하여 모든 경우에 추가적으로 photoaging을 시행한 결과 부기적인 색변화는 기준치보다 작은 것으로 나타났다. 이상의 결과는 교정치료를 위한 브라켓 부착으로 인해 브라켓 부착 및 인접부위의 치아색 변화가 있음을 의미하며 임상과정에서 이에 대한 고려가 필요함을 시사하였다. The purpose of this study was to evaluate the tooth color changes of resin bonding sites and their adjacent sites on orthodontic bracket bonding. Sixty extracted sound premolars were used and the tooth color was recorded according to the CIE L*a*b* color system using a spectrophotometer. The tooth colors of the twenty premolars were measured and compared before bracket bonding and after removal. On a further twenty premolars, the tooth color was measured before and after only primer application. In the change of L* values, according to the bracket bonding and primer application, the lightness was decreased, and in the change of a* and b* values, the color was changed into a more yellowish color. The color differences (ΔE*) were calculated from the L*a*b* values and compared with the standard value of clinical detection (ΔE*=3.7). The color differences between before the bracket bonding and after removal noted exceeded the standard value and those of between before and after the primer application were not larger than the standard value. Tooth brushing was performed after application of the primer to evaluate the color changes according to the primer abrasion. As a control, toothbrushing was performed on the last twenty premolars. The color differences noted were larger than the standard value after toothbrushing. Also, to evaluate the color changes of the tooth which is exposed to sun irradiation after bracket removal, additional photoaging was performed and the color was measured for all teeth. The additional color differences after photoaging were smaller than the standard value. The above results suggest that the tooth color changes after fixed orthodontic treatment.

자연치와 복합레진의 색 분포에 관한 연구

김희선,이인복,엄정문 대한치과보존학회 2001 Restorative Dentistry & Endodontics Vol.26 No.2

The structure of current guides is largely illogical and without any rational use of color ordering. The shade guides are generally made of plastic (rather than the actual composite material) and do not accurately depict the true shade, translucency, or opacity of the composite resin after polymerization. To solve this problem, information based on evaluations of natural teeth and material that use the same method and experimental conditions is necessary. The present investigation measured the color of natural maxillary anterior teeth in vivo and compared the results with those of composite resins. 269 Korean subjects were selected for this study. Intact central incisor, lateral incisor, and canine were selected. The clinical crowns were free of caries or restorations. The middle site of the coronal portion on the labial surface of the tooth was measured by Chroma Meter. The five light activated, resin-based materials(Amelogen, Denfil, Elitefil, Spectrum, Z100) were used in this study. Resin composite was condensed into plastic mold with a diameter of 8mm and a thickness of 4mm, pressed between glass plates to flatten the surfaces, and polymerized using a Visilux II visible light-activation unit, The surfaces were polished sequentially on wet sandpaper. Color measurements of each specimen were accomplished by Chroms Meter. A compute program that compares each tooth color with each composite resin color was written and the minimum CIELAB color difference(ΔE*) between tooth and each material was calculated. Under the conditions of this study: 1.Teeth tend to become darker with advancing age. 2.Canines were darker, more yellow, and less green than incisors. 3.The teeth from the women were lighter, more green, and less yellow than the male teeth. 4.In general, composite resins were lighter, more green, and less yellow than teeth. Deficiencies were noted in Hues in YR range. 5.Mean color differences between the five composite resin products and teeth were detectable to the naked eye(ΔE*>1.0). 6.In comparing the mean ΔE* values of materials, Spectrum showed the least followed by Z100, Elitefil, Amelogen, Denfil in increasing order.

치아미백술에 대한 기대도에 관한 연구

구효진,이명주,박정희 대한치과위생학회 2015 대한치과위생학회지 Vol.17 No.2

In this study, in order to investigate the expectation on the tooth bleaching according to oral health behavior, factors associated with tooth bleaching and colorable-food consumption and to improve individual satisfaction after one who had the tooth bleached, Survey had been conducted on the 139 target female Dental Hygiene Students in Masan university on September, 2013. 1. Expectation on the tooth bleaching according to health behavior of Group tooth-brushing less than or equal to twice a day has is higher than that on group tooth-brushing thrice a day. Differences between them is statistically significant (p=0.047), Psychological expectation according to regular check-up and Scaling within 1 year has statistical significance (p<0.05). 2. Expectation on the tooth bleaching according to subjective expectation on the tooth color has statistical significance satisfaction on psychological expectation, social expectation and total expectation (p<0.05), Expectation on the tooth bleaching according to interest in the tooth bleaching has social expectation, side effect and total expectation (p<0.05). Experience of the tooth bleaching has statistical significance according to experience one who heard whose tooth is dark and harm on social community attitudes (p<0.05). 3. Expectation on the tooth bleaching according to colorable-drink consumption has statistical significance on aesthetic expectation and side effect (p<0.05), side effect has according statistical significance to colorable-food consumption (p=0.039). Result of study is that expectation on the tooth bleaching is influenced by not only expectation on the tooth color, experience of the tooth bleaching and interest in the tooth bleaching, but also consumption of colorable food. But utilizing by the result of study, it is believed to be further studied methods that improving individual satisfaction according to the tooth bleaching.

Color comparison between non-vital and vital teeth

Delia Cristina Greta,Horațiu Alexandru Colosi,Cristina Gasparik,Diana Dudea 대한치과보철학회 2018 The Journal of Advanced Prosthodontics Vol.10 No.3

PURPOSE. The aim of this study was to define a color space of non-vital teeth and to compare it with the color space of matched vital teeth, recorded in the same patients. MATERIALS AND METHODS. In a group of 218 patients, with the age range from 17 to 70, the middle third of the buccal surface of 359 devitalized teeth was measured using a clinical spectrophotometer (Vita Easyshade Advance). Lightness (L*), chromatic parameters (a*, b*), chroma (C*), hue angle (h) and the closest Vita shade in Classical and 3D Master codifications were recorded. For each patient, the same data were recorded in a vital reference tooth. The measurements were performed by the same operator with the same spectrophotometer, using a standardized protocol for color evaluation. RESULTS. The color coordinates of non-vital teeth varied as follows: lightness L*: 52.83–92.93, C*: 8.23–58.90, h: 51.20–101.53, a*: -2.53–24.80, b*: 8.10–53.43. For the reference vital teeth, the ranges of color parameters were: L*: 60.90–97.16, C*: 8.43–39.23, h: 75.30–101.13, a*: -2.36–9.60, b*: 8.36–39.23. The color differences between vital and non-vital teeth depended on tooth group, but not on patient age. CONCLUSION. Non-vital teeth had a wider color space than vital ones. Non-vital teeth were darker (decreased lightness), more saturated (increased chroma), and with an increased range of the hue interval. An increased tendency towards positive values on the a* and b* axes suggested redder and yellower non-vital teeth compared to vital ones.

치아 미백술 후 기호 음료 섭취가 색조 환원에 미치는 영향: 1년 추적조사

구효진 ( Hyo Jin Goo ),조민정 ( Min Jeong Cho ),정윤숙 ( Yun Sook Jung ),김지혜 ( Ji Hye Kim ),동판 ( Fan Dong ),송근배 ( Keun Bae Song ) 대한예방치과·구강보건학회 2016 大韓口腔保健學會誌 Vol.40 No.1

Objectives: This study aimed to observe the decrease in tooth color after home and office bleaching due to consumption of juice, soda, and coffee over a period of one year. Methods: We obtained written consent from 30 subjects, who were divided into two groups i.e., home bleaching and office bleaching groups. They were treated with opalessence® and Zoom2 whitening gel, and the color of their teeth was assessed using shade Eye-NCC over a one-year period. A self-describing questionnaire was used to determine the frequency of juice, soda, and coffee consumption. Results: The changes in color were measured before and after 1 day, 1 month, 3 months, 6 months, and 12 months. Although the tooth color slightly changed after 12 months, the teeth were brighter than the original color. Consumption of juices, sodas, and coffee is thought to be associated with decrease in tooth color, although the change was not statistically significant. Conclusions: The ΔE* values showed that the tooth bleaching effect remained for 12 months. Consuming a normal amount of juice, sodas, and coffee does not significantly reduce tooth color after tooth bleaching.

An Evaluation of the Repetitive Tooth Bleaching with Nonthermal Atmospheric Pressure Plasma

Seoul Hee Nam,Gyoo Cheon Kim,Jin Woo Hong 대한구강생물학회 2016 International Journal of Oral Biology Vol.41 No.4

This study was undertaken to achieve a high bleaching efficacy with plasma, through longer application and reparative bleaching processes, by different shade evaluation methods. Extracted human teeth were divided into 6 groups (n=10). All teeth were treated in pairs. Low concentration of 15% carbamide peroxide (CP) was applied, with and without plasma, for 10, 20, and 30-min tooth bleaching, respectively. The bleaching procedure was repeated once daily for four days. The teeth were maintained in a moist environment provided by artificial saliva. The Vitapan Classical shade guide and Commission Internationale de L’Eclairage (CIELAB) color system were collectively used to measure the bleaching efficacy. Color evaluation was statistically analyzed using Student t-test and one-way analysis of variance (ANOVA) complemented by Tukey’s test. Combining the plasma with 15% CP showed significantly greater color changes compared to bleaching without plasma (p<0.05). A high bleaching efficacy with plasma is proportional to the repetitive application and the treatment time. A 30-min application with plasma provided the best bleaching. Repetitive bleaching showed lower probability of color relapse of the bleached tooth. The color change by shade guide correlated with the changes in CIELAB color system. A value of 1 color change units (CCU) conversion factor for overall color change (ΔE) values comparisons was 3.724 values. The two measuring methods provide a more accurate correspondence of color change. The repetitive and longer application for tooth bleaching, combined with plasma, has a strong bleaching effect and produces whiter teeth

치과용 디지털 색상 분석용 기기의 정확성과 재현 능력에 대한 평가

정중재,박수정,조현구,황윤찬,오원만,황인남 大韓齒科保存學會 2008 Restorative Dentistry & Endodontics Vol.33 No.4

본 연구에서는 치과용 디지털 색상 분석기기 중 하나인 ShadeScan (CYNOVAD, Montreal, Canada)의 색상 분석의 정확성과 재현 능력을 평가하였다. 균일한 치아 배열을 가진 20대 성인 남자 8명과 여자 8명의 상악 인상을 고무인 상제 (Exaflex, GC, Japan)를 이용하여 채득하고, 인상에 A2 색상의 임시 크라운 제작용 자가중합형 레진을 주입하여 치아 모델을 완성하고, ShadeScan을 이용해 각 치아의 영상을 얻어 컴퓨터의 ShadeScan 프로그램으로 분석하였다. 그리고 측정 결과의 재현 능력를 평가하기 위해 2개의 치아 모델을 임의로 선택하여 각 치아마다 10회의 색상 측정을 시행하여 분석 결과를 비교하였다. 또한 분석된 영상의 동일 shade 간의 색차를 확인하기 위해 광중합 복합레진인 Gradia Direct (GC, Tokyo, Japan)와 shade guide의 CIE L^(*)a^(*)b^(*) 값을 백색과 흑색 배경판 상에서 spectrophotometer (Spectrolino, GretagMacbeth, USA)로 측정하고, ShadeScan에 의해 동일한 shade로 분석된 shade guide간의 색차를 계산하여 다음의 결과를 얻었다. 모든 치아에서 모델 제작 재료와 동일한 A2 색상므로 분석된 경우는 없었으며, 개개의 치아에서 전체 순면이 동일한 색상으로 분석된 예는 없었다. 또한 동일한 치아군에서 치아의 크기 , 형태 , 순면의 굴곡 등에 따라 서로 다른 색상 분포를 보였다. 재현성 평가에서 각 치아의 중앙부는 비교적 일정한 재현성출 보였으나, 절단부와 주변 부위는 재현성이 낮았으며, 동일한 shade로 분석된 shade guide 간에는 3 이상의 색차 (ΔE^(*))를 보였다. 이상의 결과는 치과용 디지털 색상 분석기기는 비록 높은 재현 능력은 가지고 있지만 정확성에 오류가 있음을 시사하며 , 따라서 이러한 기기를 이용한 색상 분석 시 좀 더 세밀한 주의와 다른 방법의 추가 사용이 필요하리라 사료된다. This study was done to evaluate the reliability of the digital color analysis system (ShadeScan, CYNOVAD, Montreal, Canada) for dentistry. Sixteen tooth models were made by injecting the A2 shade chemical cured resin for temporary crown into the impression acquired from 16 adults. Surfaces of the model teeth were polished with resin polishing cloth. The window of the ShadeScan handpiece was placed on the labial surface of tooth and tooth images were captured, and each tooth shade was analyzed with the ShadeScan software. Captured images were selected in groups, and compared one another. Two models were selected to evaluate repeatability of ShadeScan, and shade analysis was performed 10 times for each tooth. And, to ascertain the color difference of same shade code analyzed by ShadeScan, CIE L^(*)a^(*)b^(*)values of shade guide of Gradia Direct (GC, Tokyo, Japan) were measured on the white and black background using the Spectrolino (GretagMacbeth, USA), and Shade map of each shade guide was captured using the ShadeScan. There were no teeth that were analyzed as A2 shade and unique shade. And shade mapping analyses of the same tooth revealed similar shade and distribution except incisal third. Color difference (ΔE^(*)) among the Shade map which analyzed as same shade by ShadeScan were above 3. Within the limits of this study, digital color analysis instrument for dentistry has relatively high repeatability, but has controversial in accuracy.

Can We Prevent Coffee Stains on Teeth?

Tugce Odabas,Rufat Hajiyev,Ahmet Gultekin,Ozge Ozer Atakoglu,Osman Tolga Harorli 한국식품영양과학회 2021 Journal of medicinal food Vol.24 No.12

This study evaluates whether some common beverages treated before coffee could protect or increase tooth staining caused by coffee. Initial color of 50 incisor teeth were measured with a spectrophotometer and recorded according to CIELAB color system. Teeth were randomly divided into five groups, water (control), milk, green tea, orange juice, and cola (n = 10) and were kept in selected beverage for 10 min. Immediately afterward, they were immersed in coffee and allowed to stand for 24 h. The treatment was repeated for 5 days. At the end of the fifth day, L*a*b* color measurements of the teeth were repeated. Calcium, phosphorus, potassium, and magnesium changes on representative teeth surfaces were also investigated with X-ray fluorescence spectroscopy. Color differences were calculated with both CIEab and CIE00 formulas. Groups were compared with Kruskal–Wallis test complemented by the Bonferroni correction and Mann–Whitney U test for pairwise comparisons (P = .05). The teeth submitted to coffee challenges after distillated water or beverages showed a perceptible color change. Soaking in cola or orange juice before coffee immersion caused severe tooth discoloration. All the beverages tested here were not able to protect the tooth from coffee staining. People should be informed that some acidic beverages consumed before a coffee can worsen the coffee-based tooth discolorations.

pH 순환 모형을 이용하여 15% 과산화요소를 함유한 치아미 백제가 심미수복재의 색, 미세경도 및 거칠기에 미치는 영향

박소영 ( So Young Park ),송민지 ( Min Ji Sond ),전수영 ( Su Young Jeon ),김선영 ( Sun Young Kim ),심연수 ( Youn Su Shim ) 한국치위생학회(구 한국치위생교육학회) 2013 한국치위생학회지 Vol.13 No.2

Objectives: The purpose of this study was to evaluate the effects of tooth bleaching agent contained 15% carbamide peroxide on the color, microhardness and surface roughness of tooth-colored restorative materials by using pH cycling model. Methods: Four types of tooth-colored restorative materials, including a composite resin(Filtek Z350; Z350), a flowable composite resin(Filtek P60: P60), a compomer(Dyract® AP; DY), and a glass-ionomer cement(KetacTM Molar Easymix ; KM). were used in the study. Eighty-eight specimens of each material were fabricated, randomly divided into two groups(n=44): experimental group(15% carbamide peroxide) and control group(distilled water). These groups were then divided into four subgroups(n=11). All groups were bleached 4 hours per day for 14 days using pH cycling model. The authors measured the color, microhardness, and roughness of the specimens before and after bleaching. The data were analyzed with ANOVA and T-test. Results: Z350 and P60 showed a slight color change(△E*), whereas DY and KM showed significantly color change(p<0.05). Among them, the greatest color change was observed in DY. Percentage microhardness loss(PML) of the distilled water group was 1.8 to 5.1%, and 15% peroxide peroxide group was 5.0 to 25.2%. Microhardness of DY and KM showed a statistically significant decrease(p<0.05). Roughness was increased in all groups after bleaching. Z350 and P60 does not have a significant difference(p>0.05), however DY and KM significantly increased more than the 0.2 ㎛(p<0.05). Conclusions: The effects of bleaching on restorative materials were material dependent. It is necessary to consider the type of the material before starting the treatment.

수 종의 칼슘-실리케이트 치수복조제의 치관 색조 변화

전지윤,최남기,김선미,Jeon, Jiyoon,Choi, Namki,Kim, Seonmi 대한소아치과학회 2021 大韓小兒齒科學會誌 Vol.48 No.3

치수복조제는 치관부에 위치하기 때문에 색 안정성이 최종적인 심미성에 영향을 미치는 중요한 요소로 간주된다. 이 연구는 시간에 따른 치관의 색조 변화를 분석하여 치수복조제의 색조 안정성을 비교해보고자 하였다. 발거된 소구치의 치관에 와동을 형성하고 4가지 종류의 치수복조제를 충전하였다. 색상 변화는 분광광도계를 사용하여 재료를 넣기 전, 재료를 넣은 즉시, 재료를 넣고 1일 후, 1주 후, 2주 후, 4주 후, 8주 후, 12주 후, 16주 후에 측정을 시행하였다. Proroot white MTA^®와 TheraCal LC^®는 시간이 지남에 따라 지속적인 L^* 값의 감소와 ∆E^* 값의 증가를 보였다. 반면 Biodentine^®과 Well-root^TM PT는 유의한 L^* 값의 변화가 없었고 일정한 ∆E^* 값을 유지하였다. 방사선 불투과성 물질로 산화 비스무트가 포함된 치수복조제의 적용 시 치아의 색조 변화가 나타날 수 있으며, 법랑질의 두께가 얇은 유치의 수복이나 전치부의 심미 수복 시 치수복조제의 장기적인 색 안정성을 고려해야 한다. Color stability of pulp-capping material is considered vital to the final aesthetic result since the material is placed in the coronal area. The purpose of this study was to compare the color stability of various pulp-capping materials by analyzing color change of tooth over time. A cavity was formed in the crown of the extracted premolar, and 4 types of pulp-capping materials were filled. Color assessment was performed with a spectrophotometer at different intervals: before placement; immediately after material placement; 1 day, 1 week, 2 weeks, 4 weeks, 8 weeks, 12 weeks, and 16 weeks after placement. Proroot white MTA^® and TheraCal LC^® showed a significant decrease in the L^* value and an increase in the ∆E^* value over time. In contrast, Biodentine^® and Well-Root^TM PT showed no significant change in the L^* value and maintained a steady ∆E^* value. The application of pulp-capping materials containing bismuth oxide as a radiopacifier may result in a color change of teeth. Long-term color stability of pulp-capping materials should be considered when treating teeth with thin enamel thickness or in aesthetically important area.