• 대한치과보철학회지
• /
• 제37권2호
• /
• pp.235-241
• /
• 1999

The bond failure of resin teeth In denture base resin is one of the failure in prosthodontic treatment. The purpose of this study was to evaluate the bond strength of artificial resin teeth to the denture base resins. Specimens were made with heat curing acrylic resins (Vertex Rs, Lucitone 199) and artificial resin teeth (Tiger, Trubyte biotone, Endura, Orthosit, Tubyte bioform IPN) and the bond strength were measured with testing machine(Zwick. Germany) and the mode of bond failure were observed. The results were as follows; 1. The bond strength of Vertex Rs to artificial resin teeth was the highest in Tubyte biotone, and It was the lowest in Tiger and Trubyte bioform IPN. 2. The bond strength of Lucitone 199 to artificial resin teeth were higher in Orthosit and Trubyte bioform IPN than in Tiger and Trubyte biotone. 3. The bond strength of Trubyte biotone to Vertex Rs was higher than to Lucitone 199 and that of the Trubyte bioform IPN to Lucitone 199 was higher than to Vertex Rs. 4. Nearly all bond failures of specimens occured cohesively within the resin teeth.

• 대한치과기공학회지
• /
• 제43권2호
• /
• pp.48-55
• /
• 2021

Purpose: This study aimed to analyze deformation according to post-curing of complete arch artificial teeth for temporary dentures printed with a digital light processing (DLP) printer. Methods: An edentulous model was prepared and an occlusal rim was produced. The edentulous model and occlusal rim were scanned using a model scanner. A complete denture was designed using a dental computer-aided design, and the denture base and artificial tooth were separated. Ten complete arch artificial teeth were printed using a 3D printer (DLP). Complete arch artificial teeth was classified into the following three groups: a group no post-curing (NC), a group with 10 minutes post-curing (10M), and a group with 20 minutes post-curing (20M). Specimens were scanned using a model scanner. The scanned data were overlapped with the reference data. Statistical analysis was performed using one-way ANOVA analysis of variance, Kruskal-Wallis test, and Mann-Whitney U test (α=0.05). Results: Regarding the overall deviation of complete arch artificial teeth, the NC group showed the lowest mean deviation of 111.13 ㎛ and the 20M group showed the highest mean deviation of 131.03 ㎛. There were statistically significant differences among the three groups (p<0.05). Conclusion: The complete arch artificial tooth showed deformation due to post-curing. In addition, the largest shrinkage deformation was observed at 10 minutes of post-curing, whereas the least deformation was observed at 20 minutes.

• 구강회복응용과학지
• /
• 제40권2호
• /
• pp.82-90
• /
• 2024

치조제의 조직 변화, 의치 또는 지대치의 파절 등으로 인해 국소의치의 수리가 필요한 경우가 종종 발생한다. 기존 국소의치의 금속 구조물에 맞는 보철물을 제작하면 몇 가지 장점이 존재한다. 환자의 경제적 부담이 줄어들고, 새로운 의치를 제작하기 위해 여러 번 내원할 필요가 없다. 자연치아가 파절되어 의치를 수리할 때 사용되는 인공치는 자연치아와 유사한 형태를 갖기 어려우며, 심미적인 인공치 수리를 위해서는 환자 개개인의 치아 형태와 유사한 맞춤형 인공치 제작이 필요하다. 최근에는 CAD/CAM 기술을 이용한 기존 국소의치에 맞는 보철물을 제작하여 높은 유지력과 적합도를 확보할 수 있으며, 맞춤형 인공치아를 디자인하여 더욱 심미적이고 조화로운 의치 수리가 가능하다. 디지털 방식을 이용하여 기존 국소의치에 맞춤형 보철물과 인접치열을 미러링한 맞춤형 인공치를 제작하여 의치를 수리한 증례로 시간과 비용을 절약하고 과정을 단순화하면서 심미적, 기능적으로 만족스러운 결과를 얻었기에 이를 보고하는 바이다.

• 대한치과보철학회지
• /
• 제34권3호
• /
• pp.457-463
• /
• 1996

An esthetically pleasing result in denture service is dependent upon several consideration. Esthetic considerations for the edentulous patient include tooth size, shape, arrangement, positioning, gingival contour, age, sex, personality differences, and ethnic type. Especially, the form of anterior artificial teeth is an important factor on the esthetics. The selection of artificaial teeth requires understanding and knowledge on physical and biologic factors and has to meet the indivisul esthetics and functional needs of each patient. However, the selection of artificial teeth is based on the large degree of subjective judgement of the dentist, Therefore, this is one of the most unscientific processes. Many attempts have been made to find a guideline for the selection of artificial teeth. Temperamental theory by White and Hall utillized with the physical characteristics such as body size, body form, color of eyes and hair, and disposition. SPA theory by Frush and Fisher utilized with the basis of sex, personalities, and age of the indivisual. There has not been provided for a guideline and study on the selection of artificial teeth for Koreans yet. This study was aimed to evaluate the William's typal matching theory in Koreans. 1. The facial forms of korean adult were ovoid(46.3%), square(36.7%) and tapered(17.0%) form. 2. The anatomic forms of natural maxillary incisors were ovoid(45.3%), tapered(31.3%), square(23.3%) form. 3. The forms of face and natural maxillary incisors were ovoid(21.9%), squared(11%), tapered(6.3%). 4. The natural maxillary incisors were similar in form to the facial form only in 39%. There was no correlation between the form of the face and the form of natural maxillary central inisors in Koreans. 5. Artificaial teeth which was selected according to the typal matching theory did not represent the form of the natural teeth in 61 per cents of the fatal, but it felt that they harmonized with the form of the patient's face and produced good results.

• The Journal of Advanced Prosthodontics
• /
• 제12권2호
• /
• pp.55-60
• /
• 2020

PURPOSE. The aim was to evaluate the effect of four acidic beverages on the roughness (Ra) and color change (ΔE_ab) of two brands of artificial teeth and a heat-polymerized acrylic resin (HPAR) for use in a prosthetic base. MATERIALS AND METHODS. All materials were divided into 5 groups, according to the used acidic beverage (artificial saliva - control, red wine, orange juice, coke-based, and lemon juice-based soft drink). The immersion process was divided into two stages: T1 - immersion in the acidic solutions for 10 minutes for 14 days; T2 - after T1, the samples were immersed in grape juice for 14 days. The Ra of the samples was evaluated in a rugosimeter and the ΔE_ab in a spectrophotometer, before and after the immersions. The analysis of variance of one (ΔE_ab) and two factors (Ra) and Tukey were performed (α=.05). RESULTS. There was a statistical difference for roughness after immersion (T1) for Trilux and Tritone teeth, regardless of the acid solution. For Trilux teeth, all acid solutions increased Ra (P<.05). For Tritone teeth, only the coke-based soft drink did not statistically change Ra. Grape juice (T2) altered Ra only of artificial teeth (P<.05). The color was changed for all materials, after T1 and T2. CONCLUSION. In general, the acidic solutions changed the Ra and ΔE_ab of HPAR and artificial teeth after T1. The grape juice altered the roughness only of the artificial teeth, promoting a clinically acceptable color change in the materials.

• 대한치과보철학회지
• /
• 제58권4호
• /
• pp.300-305
• /
• 2020

목적: 인공치의 표면처리가 3D 프린팅 의치상레진과의 전단결합강도에 미치는 영향을 알아보고 임상적용에 있어 참고하기 위함이다. 재료 및 방법: 3D 프린팅 의치상레진을 3D 프린터를 이용하여 시편을 제작하였고, 인공치의 표면처리는 sandblasting, 프라이머의 적용 유무에 따라 5가지 군으로 나누어, 각 군마다 10개씩 진행하였다. Universal testing machine을 이용하여 전단 결합 강도를 측정하였고, 측정값은 one-way ANOVA로 통계분석 후 Turkey test를 통해 사후검정하였다. 이후 파절된 시편을 주사전자현미경을 이용하여 관찰하였다. 결과: 평균전단결합강도는 표면 처리 하지 않은 군에서 가장 낮은 값을 나타내었으며, 프라이머 처리한 군에서 유의하게 높은 결과 값을 나타내었다(P < .05). 또한 프라이머 처리한 군에서 대부분 응집파절을 나타내었다. 결론: 3D 프린팅 의치상레진에 인공치를 결합 시 인공치의 기계적·화학적 표면처리는 전단결합강도를 증가시켜 3D 프린팅 방식을 사용하여 의치를 제작할 경우 기계적·화학적 표면처리를 통해 인공치의 탈락을 줄일 수 있으며, 특히 sandblasting 과 프라이머를 처리하는 방법이 추천된다.

• 대한치과보철학회지
• /
• 제16권1호
• /
• pp.32-37
• /
• 1978

The purpose of this study was to apply the position, the form and the angle of the attrition in the natural maxillary central incisors shown on the labial surface to the artificial teeth in the field of prosthetic dentistry. So we should exactly alter the molds of artificial teeth in individual cases in order to make artificial teeth more natural. 226 extracted teeth of the maxillary central incisors were chosen as materials. I have exactly examined the teeth with a magnifying glass and a circular graduator under concentrated light. The observation brought me the following results: 1) The attrition was most prevailing at the range from the mesial angle to the middle part of cutting edge in the left maxillary central incisor, and distal angle of cutting edge in the right maxillary central incisor. 2) On the attrite form of both angles, the angulated form was more than 4 times as frequent as rounded form in the mesial angle, and almost equal in the distal angle. 3) On the attrite form of cutting edge, mesial attrite form including mesial angle was most frequent in the left maxillary central incisor, and distal attrite form including distal angle in the right maxillary central incisor. 4) The angle made by the labial surface and the attrite surface was about $39^{\circ}$, and more than 70% of the total examined teeth were included at the range from $31^{\circ}\;to\;50^{\circ}$. 5) None attrite form at the cutting edge was about 12% and completely attrite form at the cutting edge was about 27% of examined teeth.

• 한국콘텐츠학회논문지
• /
• 제15권6호
• /
• pp.267-275
• /
• 2015

본 연구는 표면 처리에 따른 거칠기가 인공치의 색 안정성에 미치는 영향을 알아보고자 실시되었다. 표면 처리를 달리한 3개 군의 인공치 20개씩을 각각 간장, 고추장, 커피, 콜라에 침전시켰으며, 분석 장비는 Shade eye(Chroma Meter, Shofu, U.S.A)를 사용하였다. 침전시킨 시편들은 침전 후 각 1일, 3일, 1주, 2주, 3주. 4주 주기로 치아의 중앙부위 중에서 무작위로 3점을 선택하여 한 지점 당 3회씩 측정 한 후 그 평균값을 이용하여 L*, a*, b*값을 측정하였다. 다중회귀 분석 결과, 표면 처리에 따른 인공치의 ${\Delta}E*$ 값은 2군에서 유의미한 음(-)의 영향을 미치는 것으로 나타냈으며(p<0.001), 오염원 중 고추장(p<0.001)이 인공치의 색변화에 가장 큰 영향을 미치는 것으로 나타났다.

• Imaging Science in Dentistry
• /
• 제53권3호
• /
• pp.199-207
• /
• 2023

Purpose: The objective of this study was to evaluate the accuracy and effectiveness of an artificial intelligence (AI) program in identifying dental conditions using panoramic radiographs(PRs), as well as to assess the appropriateness of its treatment recommendations. Materials and Methods: PRs from 100 patients(representing 4497 teeth) with known clinical examination findings were randomly selected from a university database. Three dentomaxillofacial radiologists and the Diagnocat AI software evaluated these PRs. The evaluations were focused on various dental conditions and treatments, including canal filling, caries, cast post and core, dental calculus, fillings, furcation lesions, implants, lack of interproximal tooth contact, open margins, overhangs, periapical lesions, periodontal bone loss, short fillings, voids in root fillings, overfillings, pontics, root fragments, impacted teeth, artificial crowns, missing teeth, and healthy teeth. Results: The AI demonstrated almost perfect agreement (exceeding 0.81) in most of the assessments when compared to the ground truth. The sensitivity was very high (above 0.8) for the evaluation of healthy teeth, artificial crowns, dental calculus, missing teeth, fillings, lack of interproximal contact, periodontal bone loss, and implants. However, the sensitivity was low for the assessment of caries, periapical lesions, pontic voids in the root canal, and overhangs. Conclusion: Despite the limitations of this study, the synthesized data suggest that AI-based decision support systems can serve as a valuable tool in detecting dental conditions, when used with PR for clinical dental applications.

• 구강회복응용과학지
• /
• 제21권2호
• /
• pp.105-111
• /
• 2005

It is essential to establish the suitable position for artificial maxillary anterior teeth, because of not only esthetics, phonetics, mastication, but also optimal position of artificial posterior teeth for the construction of functional and esthetic prostheses. Anatomic landmarks have been used in the arrangement of artificial teeth. Such as incisive papilla and palatal rugae are useful landmarks for positioning occlusal rim and upper anterior artificial teeth because they are relatively stable and to be identified on master cast. Therefore, if average distance between maxillary anterior teeth and landmarks in dentate subjects are measured and applied, appropriate position of occlusal rim can be initially established. In this study, to present a guide to the position of the occlusal rim for upper anterior teeth of edentulous patients, horizontal distance between anatomic landmarks were measured. Maxillary casts were made in 72 Korean dentate subjects. Horizontal distance between central incisor and incisive papilla, between incisive papilla and intercanine line, and between primary palatine rugae and gingival margin of canine were measured on each cast. The results of this study were as follows ; 1. The mean distance from the incisal edge of central incisor to the posterior border of incisive papilla was 12.1 mm (Male 12.2 mm, Female 11.9 mm). 2. The mean distance between posterior border of incisive papilla and intercanine line was 3.5 mm (Male 3.4 mm, Female 3.6 mm / Left 3.6 mm, Right 3.4 mm). 3. The mean distance from the palatal gingival margin of canine to the lateral border of primary palatine rugae was 2.4 mm (Male 2.4 mm, Female 2.4 mm / Left 2.4 mm, Right 2.3 mm). 4. On all measured items, there were no significant differencies in measured values between male and female, and between left and right sides. (P>0.05).