Avaliação qualitativa de dentes artificiais de resina acrílica após escovação simulada / Qualitative evaluation of artificial acrylic resin teeth after simulated brushing

Introdução: os dentes artificiais de resina acrílica são amplamente utilizados na confecção de próteses, por apresentarem propriedades físicas, mecânicas e biológicas, além de características de fácil manuseio. No entanto, devido sua característica de baixa resistência à abrasão, a escovação pode levar à perda de massa dos dentes artificiais e aumento da rugosidade. Objetivo: avaliar de forma qualitativa a rugosidade superficial e polimento de dentes artificiais das marcas Hereaus Premium; Trilux e Vita, após período de 1 ano de escovação, com fotografias em Lupa Estereoscópica. Metodologia: para a realização deste estudo, serão utilizados 10 dentes artificiais de cada marca comercial (Trilux, Vita e Hereaus Premium). Os dentes serão fixados com resina ortoftálica em tubo de PVC de 15 mm de espessura. Para o teste de abrasão, será usada uma máquina de escovação simulada com escovas de dentes de cerdas macias e solução de pasta de dente. As imagens serão obtidas com câmera digital acoplada a lupa estereoscópica. A rugosidade superficial e o polimento serão analisados antes da escovação simulada e após 12 meses de escovação através das imagens. Resultados: após o teste de abrasão foi observado a presença de um desgaste superficial e/ou ranhuras na superfície dos dentes artificiais em todos os grupos. Porém não houve um padrão similar entre os corpos de prova de um mesmo grupo. Conclusão: Pode-se concluir que a escovação provocou o aumento da rugosidade superficial e alteração no polimento em todos os dentes artificiais utilizados.

Introduction: acrylic resin artificial teeth are widely used in the manufacture of dentures, as they have physical, mechanical and biological properties, in addition to easy handling characteristics. However, due to its characteristic of low abrasion resistance, brushing can lead to loss of mass of artificial teeth and increase in roughness. Objective: qualitatively evaluate the surface roughness and polishing of artificial teeth of Hereaus Premium brands; Trilux and Vita, after a 1-year brushing period, with photographs using a Stereoscopic Magnifying Glass. Methodology: for this study, 10 artificial teeth of each commercial brand will be used (Trilux, Vita and Hereaus Premium). Teeth will be fixed with orthophthalic resin in a 15 mm thick PVC tube. For the abrasion test, a simulated brushing machine with soft bristle toothbrushes and toothpaste solution will be used. Images will be obtained with a digital camera coupled to a stereoscopic magnifying glass. Surface roughness and polishing will be analyzed before simulated brushing and after 12 months of brushing through the images. Results: after the abrasion test, the presence of surface wear and/ or grooves on the surface of the artificial teeth was observed in all groups. However, there was no similar pattern between the specimens of the same group. Conclusion: it can be concluded that brushing caused an increase in surface roughness and change in polishing in all artificial teeth used.

Rehabilitation with implant-supported fixed dental prostheses using digital duplication technique on customized artificial tooth, interim denture and implant surgical template: A case report / 대한치과보철학회지

Bone and soft tissue conditions are important for successful implant treatment. But, the placement itself is also very important. Implants which is installed in the wrong position result in the biological, esthetical and mechanical problems. In order to place an implant in the correct position, the final restoration and diagnostic wax-up should be considered prior to the surgery. If the artificial teeth for the interim denture are directly transferred from the diagnostic wax-up, the operator can try the form of diagnostic wax-up in the mouth. If the surgical template is produced by duplicating the interim denture, the implant can be placed in the planned position. In this case, the polymethyl methacrylate (PMMA) artificial tooth was precisely milled by the digital duplication of diagnostic wax-up. And interim denture was fabricated by using these milled teeth. After the patient adapted for a sufficient period, the implant was placed at the planned position with surgical template produced by duplicating the interim denture. After confirming sufficient osseointegration, the final prostheses were made to reflect the shape of diagnostic wax-up. Through this procedure, the satisfactory functional and esthetic outcome could be acquired.

Complete denture treatment using lingualized occlusion scheme at the edentulous patient with severely absorbed flat residual ridges: a case report

Many factors should be considered for successful denture treatment at edentulous patients: support, retention, stability, occlusion, esthetics, etc. The patient who has severely absorbed residual ridges, however, treatments are challenging to satisfy those factors. The dentures that use anatomic artificial teeth show good mastication efficiency and esthetics but, can easily lose stability at absorbed ridges. On the contrary, the dentures that use non-anatomic artificial teeth perform better stability but, lower masticatory efficiency and esthetics at absorbed ridges. The lingualized occlusion, using both anatomic and non-anatomic teeth, introduced for compromise those of the pros and cons. At lingualized occlusion, buccal cusps of the teeth do not contact on centric relation. Therefore, direction of the occlusal force towards lingually, then stability of dentures increases. This case report shows the results of the treatment flat residual ridges using complete dentures with ligualized occlusion to increase dentures stability and satisfactory of the patient.

Estabelecimento de uma proporção entre largura de dentes artificiais anteriores, medidos em curva e em linha reta / Establishing a ratio between the width of anterior artificial teeth measured in curved and straight configurations

Objetivo: estabelecer uma proporção única de redução entre a medida da largura dos seis dentes artificiais anteriores superiores, em curva e em linha reta. Material e métodos: foi utilizado um dispositivo pré-fabricado, simulando o plano de cera superior, no qual foram montados os dentes (Premium, Heraeus-Kulzer Inc. ­ Hanau, Alemanha) nos seguintes modelos: T2, O2, R2, S2, S4, O4, S6, R4, R6, T4 e T6. Em seguida, a largura em curva entre os dentes anteriores montados foi medida com uma régua flexível, tendo como referência a face distal dos caninos. A partir dos dados obtidos (mm) e dos valores das medidas fornecidos na carta molde do fabricante, realizou-se o cálculo da proporção entre essas duas medidas para cada modelo de dentes. Resultados: verificou-se redução entre a medida em curva e a medida em linha reta, variando de 4% a 19% para todos os tipos de modelos estudados. Assim, não foi possível estabelecer uma porcentagem padrão única de redução para todos os tipos de dentes do fabricante. Porém, agrupando-se a redução em milímetros, observou-se uma redução variável entre os modelos em curva e em linha reta: 2 mm para o modelo T2; 3 mm para os modelos O2, R2, S2 e S4; 4 mm para os modelos O4 e S6; 5 mm para os modelos R4, R6 e T4; e 9 mm para o modelo T6. Conclusão: é possível estabelecer uma redução aproximada (em mm) entre uma medição em curva e reta na seleção de dentes artificiais Premium/Heraeus-Kulzer.

Objective: this study aimed to establish a single rate reduction between the measurement of the width of the six artificial anterior upper teeth, in curved and straight configurations. Methods: for this, a prefabricated device simulating the upper wax rim was used and received artificial teeth (Premium, Heraeus-Kulzer Inc., Hanau, Germany) from T2, O2, R2, S2, S3, O4, S6, R4, R6, T4, and T6. Next, the width of the six anterior teeth in curvature was measured from the distal of both canines. After, based on the mold chart of the manufacturer, the ratio between the straight and curved configurations was generated. Results: there was a 4% to 19% in reduction between the curved and straight configurations. A single reduction percentage was not obtained for all tooth forms. However, the reductions were 2 mm for T2, 3 mm for O2, R2, S2 and S4; 4 mm for O4 and S6; 5 mm for R4, R6, and T4; and 9 mm for T6 models. Conclusion: it is possible to establish an approximated reduction (in mm) between the curved and straight configurations for Premium/Heraeus-Kulzer artificial teeth.

Surface properties of multilayered, acrylic resin artificial teeth after immersion in staining beverages

AbstractObjective To evaluate the effect of staining beverages (coffee, orange juice, and red wine) on the Vickers hardness and surface roughness of the base (BL) and enamel (EL) layers of improved artificial teeth (Vivodent and Trilux).Material and Methods Specimens (n=8) were stored in distilled water at 37°C for 24 h and then submitted to the tests. Afterwards, specimens were immersed in one of the staining solutions or distilled water (control) at 37°C, and the tests were also performed after 15 and 30 days of immersion. Data were analyzed using 3-way ANOVA and Tukey’s test (α=0.05).Results Vivodent teeth exhibited a continuous decrease (p<0.0005) in hardness of both layers for up to 30 days of immersion in all solutions. For Trilux teeth, similar results were found for the EL (p<0.004), and the BL showed a decrease in hardness after 15 days of immersion (p<0.01). At the end of 30 days, this reduction was not observed for coffee and water (p>0.15), but red wine and orange juice continuously reduced hardness values (p<0.0004). Red wine caused the most significant hardness changes, followed by orange juice, coffee, and water (p<0.006). No significant differences in roughness were observed for both layers of the teeth during the immersion period, despite the beverage (p>0.06).Conclusions Hardness of the two brands of acrylic teeth was reduced by all staining beverages, mainly for red wine. Roughness of both layers of the teeth was not affected by long-term immersion in the beverages.

The three-dimensional measurements and analysis of anatomic artificial teeth cusp inclination / 实用口腔医学杂志

Objective:To survey the continuous change features of cusp angle in anatomic artificial teeth,and to investigate their effects on occlusal balance.Methods:28 artificial teeth of a complete denture were measured by optical three-dimensional(3D)scan-ner and the corresponding digital models were constructed using the reverse engineering software Surfacer 1 0.5.The working side cusp slopes of lateroprotrusive movement including the maxillary buccal cusp distal slopes and the mandibular buccal cusp mesial slopes were studied.The straight lines from bottom to top of cusp were constructed and the corresponding projected curves in occlusal surface were generated.The angulation values of straight line and the continuous change values of projected curve were calculated.Results:The angulation values of artificial teeth cusp inclination including straight line and corresponding projected curve were obtained.The maxillary working cusp inclination varied from 1 3.7°to 25.6°,and the mandibular working cusp inclination varied from 1 1 .3°to 37.7°.Conclusion:The relatively large differences of the cusp inclination among traditional anatomic artificial teeth and the convex form of the cusp are disadvantage factors to set up stable centric stop and unhindered chew course.

Color stability of artificial teeth after exposure to acid and staining agents / Estabilidade de cor de dentes artificiais após a exposição a agentes ácidos e corantes

Alterações na cor dos dentes artificiais ocorrem principalmente devido à ingestão de bebidas e uso de produtos de limpeza e desinfecção de próteses. Soluções mais agressivas de limpeza devem ser identificadas e o paciente deve ser informado, a fim de evitar ou reduzir a frequência de seu uso, para maior longevidade de próteses. O objetivo deste estudo foi avaliar as alterações na cor de dentes artificiais antes e após imersão em bebidas e soluções desinfetantes. Material e Métodos: noventa e seis dentes artificiais de resina foram aleatoriamente divididos em 8 grupos. Cada grupo foi imerso por 10 min em uma solução de teste (café, suco de limão, gluconato de clorexidina, vinho tinto, refrigerantes à base de cola, vinagre ou antisséptico com e sem álcool) e, em seguida, os espécimes foram armazenados em saliva artificial durante 23 horas e 50 min, perfazendo um período de 24 h. Este procedimento foi realizado durante 14 dias consecutivos e depois desse período a segunda medição de cor foi feita. Os dados obtidos com o espectrofotômetro usando o CIEL * a * b * foram analisados através de ANOVA não paramétrico, Kruskal-Walis e o teste de Dunn. Resultados: Foram verificadas diferenças na variação de cor para cada grupo experimental após o desafio. As diferenças estatisticamente significativas foram encontradas entre os grupos de café, vinho tinto e suco de limão. Conclusão: Todas as substâncias mudaram a cor dos dentes artificiais; café foi a substância que causou mais descoloração dos dentes artificiais, alterando a cor e luminosidade; os antissépticos bucais com e sem álcool promoveram clareamento dos dentes artificiais...

Changes in color of artificial teeth mainly occur due to ingestion of beverages and use of products for cleaning and disinfection. More aggressive solutions must be identified and the patient provided with explanations in order to avoid or reduce the frequency of their use, to higher longevity of dentures. The purpose of this study was to evaluate changes in color of artificial teeth before and after immersion in beverages and disinfectants. Material and Methods: 96 artificial resin teeth were randomly divided into 8 groups. Each group was immersed for 10 min into a test solution (coffee, lemon juice, chlorhexidine gluconate, red wine, cola-based soft drink, vinegar or antiseptic with and without alcohol) and then the specimens were stored in artificial saliva for 23 h and 50 min, completing a period of 24 h. This procedure was performed for 14 consecutive days and after this period the second color measurement was made. Data obtained with the spectrophotometer using the CIEL*a*b* system were statistically analyzed using ANOVA non parametric, Kruskal-Walis and the Dunn test. Results: There were found differences in color variation for each experimental group after the challenge. Statistically significant differences were found among coffee, red wine and lemon juice groups. Conclusion: All substances changed the color of artificial teeth; coffee was the substance that caused most staining of artificial teeth, altering color and luminosity; the oral antiseptics with and without alcohol promoted whitening of the artificial teeth...

A method of comparing the wear resistance of various materials used for artificial teeth / Um método de comparação de resistência de desgaste de materiais usados para dentes artificiais

OBJECTIVE: Abrasion resistance of three commercial brands of acrylic resin for artificial teeth, available on the domestic market (Biotone(r), Plus(r) and Vipi Dent Artiplus(r)) was evaluated by a new methodology called "Pirassununga Method ". METHODS: The Manufacturers produced the maxillary central incisor-shaped incisal resin specimens (n=27). These were embedded in chemically activated acrylic resin in an insulated metal matrix to fabricate test specimens, which were flattened on a lathe and refined manually with sandpaper. Wear testing was conducted in an experimental machine at the Vipi dental products factory. In the "Pirassununga Method" a polished metal sphere 4.8 mm in diameter, attached to a rotary device passes over the fixed specimens in programmable cycles, under 5N pressure, using distilled water as lubricant. In each sample, the groove caused by abrasion, was analyzed in two ways: Readout under a microscope to determine the breadth and depth of the groove caused by the ball, and by laser roughness meter readout, which obtained a value Rt. RESULTS: The nonparametric Kruskal Wallis test showed no statistically significant difference between the medians of brands evaluated in the cycles performed (p = 0.936). CONCLUSION: Artiplus(r) Brand showed a lower tendency to wear than commercial brands Biotone(r) and Plus(r) Vipi Dent, with the best performance shown for the IPN polymer. .

OBJETIVO: Avaliar a resistência ao desgaste por abrasão de três marcas comerciais de dentes artificiais de resina acrílica disponíveis no mercado nacional (Biotone(r), Vipi Dent Plus(r) e Artiplus(r)) por meio de uma nova metodologia. MÉTODOS: Os corpos de prova foram produzidos pelos fabricantes, com resina incisal em forma de incisivos centrais superiores (n=27). Esses dentes foram incluídos em resina acrílica ativada quimicamente dentro de uma matriz de metal isolada para confecção dos corpos de prova, e depois aplainados em torno mecânico e refinados com lixa d'agua manualmente. O ensaio do desgaste foi realizado em uma máquina experimental presente na fábrica de produtos odontológicos Vipi. No "Método Pirassununga" uma esfera metálica polida de 4,8 mm de diâmetro presa em um dispositivo que rotaciona, passa sobre os corpos de prova que estão fixos, em ciclos que podem ser programados, e tendo água destilada como lubrificante e pressão de 5N. O sulco provocado pela abrasão em cada corpo de prova foi analisado de duas maneiras: Leitura em microscópio para determinar a largura e a profundidade do sulco provocado pela esfera e rugosímetro de leitura a laser, do qual foi obtido o valor Rt. RESULTADOS: Por meio do teste não paramétrico de Kruskal Wallis observou-se que não houve diferença estatisticamente significante entre as medianas das marcas avaliadas nos ...

Microhardness in pressing layers of prefabricated modified acrylic resin teeth / Microdureza nas camadas de prensagem de dentes pré-fabricados em resina acrílica modificada

OBJECTIVE: The aim of this study was to evaluate the microhardness in pressing layers of prefabricated modified acrylic resin teeth. METHODS: Lower first molar teeth with two (Biotone(r) IPN and Bioform(r)) or three pressing layers (Artiplus(r), Trilux(r) Eurovipi, and Natusdent(r)) were hemisected in a bucco-lingual plane and embedded in a self-curing acrylic resin (n =10). Specimens were then ground flat and polished using 400, 600 and 1200 aluminium oxide paper in a rotatory polisher. In each pressing layer, microhardness was measured using a Knoop indenter in three different locations spaced 300 µm apart under a 10-g load, applied for 5 sec. RESULTS: Analysis of variance and Tukey's tests demonstrated that there was no difference in microhardness in the first layer of the teeth analyzed (p = 0.355), whereas in the second layer, the brand Artiplus(r) showed higher values when compared to the brand Natusdent(r) (p = 0.018). For the third layer, the brands Artiplus(r) and Trilux(r) Eurovipi revealed higher microhardness when compared to Natusdent(r) teeth (p < 0.001). CONCLUSION: For the outer most superficial layer of the artificial teeth, the microhardness of the different brands was similar, while differences were noted for the second and third layers among the artificial teeth, with Artiplus(r) teeth showing higher microhardness than Natusdent(r). .

OBJETIVO: Avaliar a microdureza nas camadas de prensagem de dentes fabricados em resina acrílica modificada. MÉTODOS: Primeiros molares inferiores pré-fabricados com duas (Biotone(r) IPN e Bioform(r)) ou três camadas de prensagem (Artiplus(r), Trilux(r) Eurovipi e Natusdent(r)), foram hemisseccionados no sentido vestíbulo-lingual e embutidos em resina acrílica autopolimerizável (n = 10). Os espécimes foram, então, planificados e polidos com lixas de óxido de alumínio nas granulações 400, 600 e 1200, em politriz giratória. Em cada camada de prensagem, a microdureza foi mensurada utilizando indentador Knoop em três diferentes localizações, espaçadas em 300 µm, sob carga de 10 g, aplicada por 5 s. RESULTADOS: Análises de variância e testes de Tukey demonstraram que os dentes avaliados não apresentaram diferenças de microdureza na primeira camada (p = 0,355), enquanto na segunda, os dentes da marca Artiplus(r) revelaram valores superiores em relação aos dentes da marca Natusdent(r) (p = 0,018). Na terceira camada, os dentes da marca Artiplus(r) e Trilux(r) Eurovipi apresentaram microdureza superior àquela verificada para os dentes Natusdent(r) (p < 0,001). CONCLUSÃO: Na camada externa, mais superficial, a microdureza dos dentes artificiais foi semelhante nas diferentes marcas. Apenas nas segunda e terceira camadas houve diferenças entre as marcas de dentes artificiais, sendo que os dentes da Artiplus(r) apresentaram microdureza superior aos dentes Natusdent(r). .

Comparação da largura dos dentes anteriores artificiais e naturais / Comparison of the width of artificial and natural anterior teeth

OBJETIVO: Verificar se a largura combinada dos seis dentes anteriores superiores artificiais fabricados e comercializados pela Dental Vipi Ltda. (Pirassununga, Brasil) é similar à mesma dimensão dos dentes naturais de brasileiros jovens e dentados. MÉTODOS: Participaram do estudo 49 estudantes jovens e dentados, sendo 20 do sexo masculino e 29 do feminino. Foram confeccionados modelos de gesso pedra para medir a largura dos seis dentes anteriores superiores por meio de uma régua milimetrada flexível. Os valores obtidos foram comparados aos valores fornecidos para os dentes artificiais, na carta molde, pelo fabricante. RESULTADOS: Foi encontrada uma média de 53,544 milímetros (desvio-padrão de 3,525) para a distância entre as faces distais dos caninos superiores, em curva. Os modelos de dentes artificiais atendem apenas a faixa de 40 a 50 milímetros de largura. CONCLUSÃO: Os dentes artificiais das marcas analisadas são substancialmente menores do que os dentes naturais da amostra em estudo.

OBJECTIVE: This study verified whether the combined width of the six artificial anterior maxillary teeth manufactured and marketed by VIPI (Dental Vipi Ltda., Pirassununga, Brazil), was similar to that of the respective natural teeth of young, dentate Brazilians. METHODS: Forty-nine dentate, healthy students (20 males and 29 females) participated in this study. Dental stone casts were made for measuring the combined width of the six anterior maxillary teeth with a flexible millimeter ruler. The combined width of the natural teeth was compared with that of the artificial teeth reported by the manufacturer in the selection chart. RESULTS: The mean anterior outside distance between the distal surfaces of the maxillary canines was 53.544 mm (standard deviation 3.525). The combined width of the artificial anterior teeth lies within the 40-50 millimeter range. CONCLUSION: The artificial teeth of the studied brand were substantially smaller than the natural teeth of the study sample.

Dimensional stability of distances between teeth in complete dentures comparing microwave polymerization and conventional cycles

Aim: This study investigated the tooth movement of complete dentures processed by micro wave activation and conventional processing method in water bath. Methods: Twenty maxillary complete dentures were fabricated and randomly assigned to 4 groups (n=5): Group I: Classico convention alheat-curing acrylic resin processed by microwave polymerization; Group II: Classico resinprocessed in water bath at 74°C for 9 h (control-group); Group III: QC-20 fast heat-curing acrylic resin processed in boiling water for 20 min; Group IV: Onda-Cryl microwave acrylic resin processed at the same conditions of Group 1. Metallic referential pins were placed on the incisal border of the central incisors, buccal cusp of the first premolars, and the mesiobuccal cusp of the second molars.Transversal and anteroposterior distances were measured before and after the complete dentures processing with a linear optical microscope (Olympus Optical Co., Tokyo, Japan) accurate to0.0005 mm. Data were subjected to A NOVA and Tukey’s test at 5% significance levels. Results:Inside each group, dentures showed some tooth movement but without statistical difference before and after the polymerization. Conclusions: Dentures processed by microwave energy presented similar performance to those subjected to conventional cycles in water bath for most of distances evaluated.

Effect of ridge lap surface treatment and thermocycling on microtensile bond strength of acrylic teeth to denture base resins

This study evaluated the effect of denture base polymer type (heat- and microwave-polymerized), ridge lap surface treatment (with and without methyl methacrylate-MMA etching) and thermocycling on the microtensile bond strength (µTBS) of Biotone acrylic teeth. Flat-ground, ridge-lap surface of posterior artificial teeth were bonded to cylinders of each denture base resin, resulting in the following groups (n=6): G1a - Clássico/with MMA etching; G1b - Clássico/without MMA etching; G2a - OndaCryl/with MMA etching; G2b - OndaCryl/without MMA etching. Rectangular bar specimens with a cross-sectional area of 1 mm² were prepared. Half of the bars in each group were thermocycled (5,000 cycles between 4ºC and 60ºC). µTBS testing was performed in an universal testing machine at a crosshead speed of 0.5 mm/min. Data were analyzed statistically by three-way ANOVA (α=0.05). There was no statisticaly significant difference (p>0.05) for the factors (resin, surface treatment,and thermocycling) or their interactions. The mean µTBS values (MPa) and standard deviations were as follows: Thermocycling - G1a: 41.00 (14.00); G1b: 31.00 (17.00); G2a: 50.00 (27.00); G2b: 40.00 (18.00); No thermocycling - G1a: 37.00 (14.00); G1b: 43.00 (25.00); G2a: 43.00 (14.00); G2b: 40.00 (27.00). The µTBS of Biotone artificial teeth to the denture base acrylic resins was not influenced by the polymer type, surface treatment or thermocycling.

Este estudo avaliou o efeito do tipo de resina de base (termo-polimerizada e polimerizada por microondas), tratamento da superfície de união (com e sem aplicação de metil metacrilato) e termociclagem sobre a resistência adesiva à microtração (RAµT) do dente artificial Biotone. A superfície cervical dos dentes foi desgastada para se obter superfícies planas, as quais foram unidas a cada uma das resinas, constituindo os seguintes grupos (n=6): (G1a) Clássico/com MMA; (G1b) Clássico/sem MMA; (G2a) OndaCryl/com MMA; (G2b) OndaCryl/sem MMA. Corpos-de-prova retangulares com área transversal de 1 mm² foram preparados. Metade dos espécimes em cada grupo foi termociclado (5000 ciclos de 4ºC a 60ºC). O teste de resistência adesiva foi realizado numa máquina de ensaios universal (velocidade da carga: 1 mm/min). Os dados foram analisados estatisticamente por meio da ANOVA para 3 fatores (α=0,05). Os valores médios de RAµT e desvios-padrão foram: Termociclagem - G1a: 41,00 (14,00); G1b: 31,00 (17,00); G2a: 50,00 (27,00); G2b: 40,00 (18,00); Sem termociclagem - G1a: 37,00 (14,00); G1b: 43,00 (25,00); G2a: 43,00 (14,00); G2b: 40,00 (27,00). A RAµT entre os dentes artificiais e as resinas acrílicas para base de prótese não foi influenciada pelos fatores resina acrílica, tratamento de superfície ou termociclagem.

A algorithm for 3D reconstruction of artificial teeth / 实用口腔医学杂志

Objective: To reconstruct three dimension (3D) model of a rtificial tooth and to establish standardized 3D artificial teeth graphic datab ase. Methods: Artificial teeth were incised with CGI autom atic cross section scanning instrument, then data points were picked up from e ach parallel layer contour of incised tooth, and 3D stereo models of artificia l tooth were retrieved using 3D reconstruction techniques. Results: 3D graphic models of 28 artificial teeth were established.The models may represent the graphic feature of the teeth. Conclusion: The present technic is feasible in the establishment of 3D graphic models of artificial tooth.

Establishment of artificial tooth coordinate for full denture / 实用口腔医学杂志

Objective:To establish three-dimension (3D) rectangular coordinate and to obtain relevant parameters of artificial tooth morphology for full denture.Methods:An artificial teeth coordinate was defined based on artificial tooth feature points, which were measured using 3D coordinate-measure-machine.Results:The 3D coordinate of 28 artificial teeth was established and the tooth parameters in the coordinate were obtained.Conclusion:The definition of artificial tooth coordinate using mathematic language is a based work of CAD full denture.