• 제목/요약/키워드: Artificial tooth

검색결과 178건 처리시간 0.022초

유효성분들을 배합한 치약제의 실험실적 및 임상적 치아미백유지 효과 (Tooth whitening maintenance efficacy of dentifrices containing several active ingredients in vitro and in vivo)

  • 안재현;김지혜;김종훈
    • 한국치위생학회지
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    • 제15권2호
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    • pp.325-332
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    • 2015
  • Objectives: The purpose of this study was to investigate tooth whitening maintenance efficacy of several dentifrices containing effective ingredients for tooth whitening. Methods: Hydroxyapatite specimens(HAPs) staining was done by using modified Stookey's methods. HAPs were treated with 2.9% hydrogen peroxide containing strip for whitening, and were shaken with several dentifrice slurry(dentifrice 1 : artificial saliva 2) for 30 minutes. The HAPs were finally dipped in staining solution for an hour. Shaking and dipping were repeated 4 times and lightness values were measured by colorimeter at each step. In clinical test, test 4 dentifrice and control dentifrice were evaluated by 21 subjects for 2 months after receiving institutional review board(IRB) approval. Organoleptic(vita shade guide) and instrumental(SHADEEYE-NCC) evaluation were performed for whiteness change of teeth. Statistical analysis was performed using repeated measures ANOVA, Tukey's post hoc test and ${\chi}^2$-test(p<0.05). Results: All dentifrices showed statistical significance in comparison with control dentifrice containing sodium fluoride and test 4 dentifrice containing sodium pyrophosphate, sodium metaphosphate, candelilla wax, and sodium fluoride showed statistical significance in comparison with other dentifrices by inhibiting staining in vitro(p<0.05). In clinical test, test 4 dentifrice showed better effects than control dentifrice in organoleptic and instrumental evaluation in tooth whitening maintenance efficacy(p<0.05). The awareness toward tooth whitening maintenance efficacy for 2 months use showed that test 4 dentifrice was much better than control dentifrice, but did not show statistically significant(p>0.05). Conclusions: Dentifrice containing sodium pyrophosphate, sodium metaphosphate, candelilla wax and sodium fluoride was more effective in keeping teeth white.

디지털 복제로 만든 맞춤형 인공치로 제작한 임시의치와 임플란트 수술용 템플릿을 통한 임플란트 지지형 고정성 보철 수복 증례 (Rehabilitation with implant-supported fixed dental prostheses using digital duplication technique on customized artificial tooth, interim denture and implant surgical template: A case report)

  • 정대길;오경철;심준성;박지만
    • 대한치과보철학회지
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    • 제57권4호
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    • pp.397-404
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    • 2019
  • 성공적인 임플란트 치료를 위해서는 식립부위의 골조직 및 연조직 상태(condition)도 중요하지만 식립 위치 또한 매우 중요하다. 잘못된 위치에 식립된 임플란트는 생물학적, 심미적, 기계적 문제점을 야기하게 된다. 올바른 위치에 임플란트를 식립하기 위해서는 최종 보철물을 고려해야 하며 이를 위해서는 진단 왁스업 과정이 필요하다. 발치 후 사용 할 임시 의치의 인공치를 진단 왁스업 형태대로 제작하면 구강내에서 진단 왁스업 형태를 평가해 볼 수 있으며, 잘 적응된 임시 의치를 복제해 제작한 임플란트 수술용 템플릿으로 계획된 위치에 임플란트를 식립하는 것이 가능하다. 본 증례에서는 진단 왁스업을 디지털 복제하여 의치용 인공치를 맞춤형으로 제작하였고, 이를 이용해 임시 의치를 제작하였다. 충분한 적응 기간을 거친 후 임시 의치를 복제하여 임플란트 수술용 템플릿을 제작한 다음, 이를 활용하여 계획된 위치에 임플란트를 식립하였다. 골유착을 위한 충분한 치유기간을 가진 다음 진단 왁스업 형태가 반영된 임플란트 지지형 고정성 보철물을 제작하였다. 최종 보철물 장착 후 6개월간의 경과 관찰 기간 동안 심미적, 기능적으로 만족할 만한 치료 결과를 보였기에 이를 보고하고자 한다.

인공타액하에서 교정선과 Bracket간의 마찰력에 대한 연구 (FRICTIONAL FORCES BETWEEN ORTHODONTIC WIRE AND BRACKET UNDER ARTIFICIAL SALIVA)

  • 고정석;양규호
    • 대한치과교정학회지
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    • 제18권1호
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    • pp.55-63
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    • 1988
  • It has been suggested that the frictional force between bracket and arch wire may impede the tooth movement. The present study was aimed to compare and analyze the effect of wire size, type of ligation, and duration of ligation on the magnitude of frictional force between cobalt chromium wire and stainless steel bracket under the artificial saliva. The results were as follows: 1. Type of ligation and size of wire were the main influencing factor on the level of friction. 2. Stainless steel ligature generated higher frictional forces than elastomeric module. 3. The rectangular wire consistently exhibited more frictional force values than round wires, while there was no significant difference between frictional forces of round wires. 4. In elastic ligature, frictional force decreased with time. 5. Artificial saliva had no significant influence on the frictional force between cobalt chromium wire and bracket.

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수종 레진 인공치의 마모도에 관한 연구 (A Study on the Wear of Artificial Resin Teeth)

  • 이정오
    • 대한치과기공학회지
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    • 제20권1호
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    • pp.51-60
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    • 1998
  • The artificial resin teeth used for removable prosthesis have good physical properties, but they have great wear rate. The purpose of this study is to compare the wear characteristics of several artificial resin teeth, such as Myerson teeth(Myerson Crop), Trubite IPN(Dentsply), Endura Posterio(Shofu), SROrthosit(Ivoclar), Trubite Biotone(Dentsply), Five samples of each resin tooth were abraded against natural teeth, type III gold for 150,000 cycles on the wear machine. The results obtained were as follow 1. The wear rate of artificial resin teeth when opposing enamel was the lowest in Myerson teeth($8.60{\mu}m$), followed by Trubite IPN($41.30{\mu}m$), Endure poster($63.00{\mu}m$), SR-Orthosit($68.40{\mu}m$), Trubite Biotone($209.90{\mu}m$) 2. The wear rate of artificial teeth when opposting type III gold specimens was the lowest in Myerson teeth($13.50{\mu}m$) followed by Endura Posterio($14.75{\mu}m$), Trubite IPN($53.40{\mu}m$), SROrthosit($54.20{\mu}m$), Trubite Boitone($341.50{\mu}m$)

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A comparison of the elimination rate of artificial dental plaque between reciprocating- and rotating-interdental toothbrushes

  • Lim, Kun-Ok
    • 한국치위생학회지
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    • 제21권1호
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    • pp.17-25
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    • 2021
  • Objectives: Interdental toothbrushes are made and sold in various design types and brush thicknesses. However, there is little research on which type of interdental toothbrush currently manufactured and sold on the market is the most effective in eliminating interdental plaque. Therefore, this study aims at comparing the elimination rate of artificial dental plaque between reciprocating- and rotating-types of interdental toothbrush based on the frequency of application and thickness of brush. Methods: This study focused on the effective management of dental plaque using interdental toothbrush, a recommended item for personal dental hygiene. The method was as follows: artificial dental plaque coloring was applied to the distal surface of artificial tooth #46 and the mesial surface of #47. The area was subject to reciprocal movement three and six times to eliminate artificial plaque. Results: The results showed that using a 0.7mm rotating interdental toothbrush, on the proximal surface of each molar, the elimination rates were: on the distal surface of #46, upon three applications 40.24%, upon six applications 30.41%; on the mesial surface of #47, upon three applications 44.52%, upon six applications 29.72%. Conclusions: These results showed that for rotating-type interdental toothbrushes, a high dental plaque elimination rate was observed even though many reciprocal movements were not performed.

인공타액 오염이 수종 상아질접착제와 상아질간의 결합에 미치는 영향 (INFLUENCE OF ARTIFICIAL SALIVA CONTAMINATION ON BONDING OF DENTIN ADHESIVES TO DENTIN)

  • 류미애;양규호;오원만
    • Restorative Dentistry and Endodontics
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    • 제17권2호
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    • pp.383-397
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    • 1992
  • The purpose of this study was to evaluate the influence of artificial saliva contamination on bonding of several dentin adhesives to dentin. Sixty - three human molar teeth extracted within a month were used. Each tooth was sectioned longitudinally in a buccolingual direction to obtain 126 specimens. These specimens were randomly divided into three groups and were treated by Scotchbond 2, Gluma and All bond. Each group was subdivided into three subgroups; normal group not contaminated with artificial saliva, contaminated with artificial saliva and dried group, and contaminated with artificial saliva and washed and dried group. Enamel/dentin bonding agent(Dental Adhesive of Scotchbond 2) was applied and light cured on the treated dentin surfaces. Thereafter P - 50 were cured on them, and specimens were stored in $37^{\circ}C$ artificial saliva for 24 hours before measuring shear bond strength. Shear bond strengths were determined using an universal testing machine with cross head speed 1mm/min and SEM examinations were conducted to evaluate the resin - dentin interface and degree of penetrating resin string into the dentinal tubules. The following results were obtained. 1. Normal groups not contaminated with artificial saliva showed greater shear bond strength than any other group contaminated with artificial saliva(P<0.01). 2. The shear bond strengths showed no significant difference between washed groups with distilled water and not washed groups after contamination with artificial saliva(P>0.05). 3. In normal groups, the shear bond strength of A group was significantly greater than in any other group(P<0.01). 4. In Sand G groups, fractures after shear bond strength tests occured adhesively on resintooth interface in all specimens. But in A groups, fracture of the normal group occured cohesively in dentin and fracture of the contaminated groups occured adhesively and cohesively. 5. On SEM examination, the number of resin strings penetrated into dentinal tubules were the greatest in normal groups, followed by, in descending order, washed groups and not washed groups after contamination with artificial saliva.

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A COMPARATIVE STUDY ON THE DIMENSIONAL CHANGE OF THE DIFFERENT DENTURE BASES

  • Kim, Myung-Joo;Kim, Chang-Whe
    • 대한치과보철학회지
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    • 제44권6호
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    • pp.712-721
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    • 2006
  • Statement of problem. Acrylic resin is most commonly used for denture bases. However, acrylic resin has week points of volumetric shrinkage during polymerization that reduces denture fit. The expandability of POSS (Polyhedral Oligomeric Silsesquioxane) containing polymer could be expected to reduce the polymerization shrinkage of denture bases and would increase the adaptability of the denture to the tissue. Purpose. The purpose of this study was to compare the dimensional stability in the conventional acrylic resin base, POSS-containing acrylic resin base, and metal bases. Materials and methods. Thirty six maxillary edentulous casts and dentures of different base were fabricated. Tooth movement and tissue contour change of denture after processing (resin curing, deflasking, decasting and finishing without polishing) and immersion in artificial saliva at $37^{\circ}C$ for 1 week and 4 weeks were measured using digital measuring microscope and threedimensional laser scanner. Results. The results were as follows: 1. The conventional resin group showed significant (p<0.01) dimensional change throughout the procedure (processing and immersion in artificial saliva). 2. After processing, the metal group and POSS resin group showed lower linear and 3-dimensional change than conventional resin group (p<0.01). 3. There was no statistically significant linear and 3-dimensional change after immersion for 1 week and 4 weeks in metal and POSS resin group. 4. In all groups, the midline and alveolar ridge crest area presented smaller 3-dimensional change compared with vestibule and posterior palatal seal area after processing and soaking in artificial saliva for 1 week and 4 weeks (p<0.01). Conclusion. In this study, a reinforced acrylic-based resin with POSS showed good dimensional stability.

Evaluating Accuracy according to the Evaluator and Equipment Using Electronic Apex Locators

  • Yu, Beom-Young;Son, Keunbada;Lee, Kyu-Bok
    • Journal of Korean Dental Science
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    • 제13권2호
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    • pp.52-58
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    • 2020
  • Purpose: Using two types of electronic apex locators, this study aimed to investigate the differences in accuracy according to the evaluator and equipment. Materials and Methods: Artificial teeth of the lower first premolars and two mandibular acrylic models (A and B) were used in this study. In the artificial teeth, the pulp chamber was opened and the access cavity was prepared. Using calibrated digital Vernier calipers, the distance from the top of the cavity and the root apex was measured to assess the actual distance between two artificial teeth. The evaluation was conducted by 20 dentists, and each evaluator repeated measurements for each electronic apex locator five times. The difference between the actual distance from the top of the cavity to the root apex and the distance measured using electronic measuring equipment was compared. For statistical analysis, the Friedman test the Mann-Whitney U-test were conducted and the differences between groups were analyzed (α=0.05). Result: As for the accuracy of measurement according to the two types of electronic apex locators, the value of the measurement error was 0.4753 mm in Dentaport ZX and 0.3321 mm in E-Cube Plus. Moreover, electronic apex locators Dentaport ZX and E-Cube Plus showed statistically significant differences (P<0.05). As for the difference in the accuracy of the two types of electronic apex locators according to the evaluator, the resulting values differed depending on the evaluator and showed a statistically significant difference (P<0.001). Conclusion: Electronic apex locator E-Cube Plus showed higher accuracy than did Dentaport ZX. Nevertheless, both types of electronic apex locators showed 100% accuracy in finding the region within root apex ±0.5 mm zone. Furthermore, according to the evaluator, the two electronic apex locators showed different resulting values.

수종의 인공 레진 치아의 마모저항성과 경도에 관한 비교 연구 (Comparative Study on Wear Resistance and Hardness of Several Artificial Resin Teeth)

  • 최유성;이준석;조인호
    • 구강회복응용과학지
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    • 제24권2호
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    • pp.129-146
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    • 2008
  • 본 연구에서는 다양한 치과 수복재료에 대합되는 의치용 레진치의 마모저항성을 알아보기 위해 통상의 아크릴 릭 레진치인 $Trubyte^{(R)}$ $Biotone^{(R)}$ (Dentsply, U.S.A.)과 고강도 레진치인 Endura $Posterio^{(R)}$ (Shofu, Japan), Physio $Duracross^{(R)}$ (Nissin, Japan)를 수복재료인 금합금, 도재, 충전용 레진에 대합시켜 마모저항성을 비교 분석하였다. 또한 앞의 세 종류의 레진 인공치와 5종류의 의치세정제인 유한락스, 폴리덴트, 싸이덱스, 헥사메딘, 증류수를 사용하여 의치세정제 및 소독제가 경도에 미치는 영향을 비교 분석하여 다음과 같은 결과를 얻었다. 1. 대합되는 수복재료로 충전용 레진, 도재를 사용한 경우 $Trubyte^{(R)}$ $Biotone^{(R)}$, Endura $Posterio^{(R)}$, Physio $Duracross^{(R)}$ 순으로 교두정 높이감소가 컸으며 세 재료간의 유의한 차이를 보였다 (p<0.05). 2. 대합되는 수복재료로 금합금을 사용한 경우 $Trubyte^{(R)}$ $Biotone^{(R)}$, Endura $Posterio^{(R)}$, Physio $Duracross^{(R)}$ 순으로 교두정 높이 감소가 컸으며, 특히 $Trubyte^{(R)}$ $Biotone^{(R)}$ 이 다른 두 종류의 인공치보다 유의성 있게 높은 교두정 높이 감소를 보였다 (p<0.05). 3. 대합되는 수복재료로 충전용 레진, 금합금, 도재를 사용한 경우 모두 $Trubyte^{(R)}$ $Biotone^{(R)}$, Endura $Posterio^{(R)}$, Physio $Duracross^{(R)}$ 순으로 무게 감소가 컸으며, 세 재료간의 유의한 차이를 보였다 (p<0.05). 4. 의치세정제에 따른 경도 감소는 실험 전과 후의 측정치를 비교했을 때 모든 레진 인공치에서 유의성 있는 차이 를 나타내었다 (p<0.05). 5. 유한락스, 싸이덱스, 헥사메딘에 담구었던 레진 인공치에 의한 경도감소는 $Trubyte^{(R)}$ $Biotone^{(R)}$, Endura $Posterio^{(R)}$, Physio $Duracross^{(R)}$ 순으로 높은 감소를 보였고, 특히 $Trubyte^{(R)}$ $Biotone^{(R)}$이 다른 두 종류의 인공치보다 유의성 있게 높은 경도 감소를 보였다 (p<0.05). 이상의 실험 결과 마모저항성 실험에서는 최근에 개발된 Physio $Duracross^{(R)}$가 다른 두 종류의 레진 인공치에 비해 세 종류의 대합되는 수복재료 모두에서 높은 마모저항성을 보였고 특히 $Trubyte^{(R)}$ $Biotone^{(R)}$에 비해 유의성 있게 높은 마모저항성을 보였다. 경도 실험에서는 Physio $Duracross^{(R)}$와 Endura $Posterio^{(R)}$$Trubyte^{(R)}$ $Biotone^{(R)}$에 비해 유의성 있게 낮은 경도감소를 보였고 (p<0.05), 폴리덴트, 증류수에서는 유의한 차이를 보이지 않았다. 따라서, Physio $Duracross^{(R)}$가 세 종류의 레진 인공치에 비해 우수한 마모저항성을 보인다고 볼 수 있고, Endura $Posterio^{(R)}$와 함께 $Trubyte^{(R)}$ $Biotone^{(R)}$에 비해서 우수한 경도를 보인다고 볼 수 있지만, 단편적인 실험 결과이므로, 아직은 신중하게 고려되어야 하고, 더 많은 연구가 필요하다고 사료된다.

Frictional property comparisons of conventional and self-ligating lingual brackets according to tooth displacement during initial leveling and alignment: an in vitro mechanical study

  • Kim, Do-Yoon;Lim, Bum-Soon;Baek, Seung-Hak
    • 대한치과교정학회지
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    • 제46권2호
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    • pp.87-95
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    • 2016
  • Objective: We evaluated the effects of tooth displacement on frictional force when conventional ligating lingual brackets (CL-LBs), CL-LBs with a narrow bracket width, and self-ligating lingual brackets (SL-LBs) were used with initial leveling and alignment wires. Methods: CL-LBs (7th Generation), CL-LBs with a narrow bracket width (STb), and SL-LBs (In-Ovation L) were tested under three tooth displacement conditions: no displacement (control); a 2-mm palatal displacement (PD) of the maxillary right lateral incisor (MXLI); and a 2-mm gingival displacement (GD) of the maxillary right canine (MXC) (nine groups, n = 7 per group). A stereolithographic typodont system and artificial saliva were used. Static and kinetic frictional forces (SFF and KFF, respectively) were measured while drawing a 0.013-inch copper-nickel-titanium archwire through brackets at 0.5 mm/min for 5 minutes at $36.5^{\circ}C$. Results: The In-Ovation L exhibited lower SFF under control conditions and lower KFF under all displacement conditions than the 7th Generation and STb (all p < 0.001). No significant difference in SFF existed between the In-Ovation L and STb for a 2-mm GD of the MXC and 2-mm PD of the MXLI. A 2-mm GD of the MXC produced higher SFF and KFF than a 2-mm PD of the MXLI in all brackets (all p < 0.001). Conclusions: CL-LBs with narrow bracket widths exhibited higher KFF than SL-LBs under tooth displacement conditions. CL-LBs and ligation methods should be developed to produce SFF and KFF as low as those in SL-LBs during the initial and leveling stage.