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1.
RCOE, Rev. Ilustre Cons. Gen. Col. Odontól. Estomatól. Esp ; 11(5/6): 515-521, sept.-dic. 2006. ilus, tab
Article in Es | IBECS | ID: ibc-68909

ABSTRACT

Conocida la importancia de la ITC y de su ajuste en el articulador para un buen resultado clínico y teniendo en cuenta que se puede determinar por diferentes procedimientos, nuestro objetivo es valorar si existe concordancia, a nivel de este parámetro, utilizando dos métodos distintos para su registro como son la axiografia y los registros posicionales de cera (RPC). Material y método: se realizaron RPC y axiografías a 16 pacientes y se valoró la concordancia entre ambos mediante el índice kappa de Cohen. Conclusión: el grado de concordancia entre estos dos métodos de registro es insignificante( índice Kappa entre 0 y 0,2)


Taking into account the well-know importane of the condilar path inclination angle and its adjustment in the articulator for a good clinical result, our aim is to see if there is concordance between two different methods: axiography and wax positional bite records. Material and method: axiographies and wax bite records were taken to 16 patients. Throughout the results we obtained we were able to see the concordance between these two methods with Cohen´s kappa index. Conclussion: the concordance between these methods was insignificant (kappa index 0 and 0,2)


Subject(s)
Humans , Male , Female , Adult , Jaw Relation Record/methods , Mandibular Condyle/anatomy & histology , Inlay Casting Wax/analysis , Biomechanical Phenomena , Reference Values
2.
Rio de Janeiro; s.n; 2000. 101 p. ilus, tab. (BR).
Thesis in Portuguese | LILACS, BBO - Dentistry | ID: lil-296623

ABSTRACT

O ajuste cervical das restauraçöes fixas é o principal fator de substituiçäo deste tipo de prótese dentária. Várias säo as causas que podem determinar estes desajustes. Entre estas, dependendo da sua magnitude, podemos citar as rugosidades superficiais. O objetivo desta pesquisa foi avaliar a influência dos revestimentos fosfatados Microfine 1700 (R1) e Termocast (R2), às ligas de níquel-crômio Verabond (L1) e Durabond (L2), submetidas as temperaturas normais e de 100ºC acima da normalidade para estufagem de anéis e fusäo das ligas, na rugosidade superficial. Foram utilizados 80 corpos de prova de acrílico que foram divididos em 16 grupos, em funçäo das variáveis, com 5 repetiçöes cada. Os corpos de prova foram fundidos em centrífuga, por induçäo. Para proceder à leitura da rugosidade, foi utilizado o rugosímetro DENTAK II. Foram realizadas cinco leituras em cada superfície externa e interna dos corpos de prova, perfazendo 800 leituras. Os principais resultados indicam que as variáveis utilizadas determinam graus variáveis de rugosidade superficial. As superfícies externas e internas comportaram-se de forma semelhante. A melhor combinaçäo do revestimento/liga foi a do revestimento Microfine 1700 (R1) associado à liga Durabond (L2). As rugosidades encontradas, possivelmente näo determinariam desajustes cervicais de restauraçöes metálicas fundidas


Subject(s)
Chromium Alloys/analysis , Dental Casting Technique , Inlay Casting Wax/analysis , Inlay Casting Wax/classification , Inlay Casting Wax/therapeutic use , Acrylic Resins/analysis , Acrylic Resins/therapeutic use , Dental Casting Investment/analysis , Inlays
3.
J Oral Rehabil ; 23(2): 114-20, 1996 Feb.
Article in English | MEDLINE | ID: mdl-8850062

ABSTRACT

The aim of this study was to develop a wax suitable to serve as a functional impression material. Several binary mixtures of paraffin, beeswax and rosin were prepared. They were characterized by differential thermal analysis (DTA), and tested for plastic deformation, thermal expansion, detail reproduction and mechanical properties. It was found that the combinations of paraffin with rosin can function well as impression materials, as they combine a high value of plastic deformation at 37 degrees C with relatively low values at room temperature. Concentrations of rosin as small as 1% or 2% are adequate to produce this result. The flow of paraffin was significantly reduced by the addition of beeswax. A linear relationship was found between the 37 degrees C flow values of paraffin-beeswax mixtures and the proportions of the ingredients.


Subject(s)
Dental Impression Materials , Inlay Casting Wax , Dental Impression Materials/analysis , Dental Impression Materials/chemistry , Differential Thermal Analysis , Elasticity , Hot Temperature , Inlay Casting Wax/analysis , Inlay Casting Wax/chemistry , Paraffin/chemistry , Plastics , Pliability , Resins, Plant/chemistry , Rheology , Stress, Mechanical , Surface Properties , Waxes/chemistry
4.
Rev. odontol. Univ. Säo Paulo ; 9(4): 285-91, out.-dez. 1995. ilus, tab
Article in Portuguese | LILACS, BBO - Dentistry | ID: lil-168276

ABSTRACT

O objetivo desta pesquisa foi estudar o efeito da alteraçäo da cera rosa n§ 7 em lâmina na montagem dos dentes. Foram utilizados materiais de três marcas comerciais, os quais foram submetidos a cinco experimentos em diferentes condiçöes de trabalho. Assim, foram utilizados: cera dura (sem aquecimento); plástica; fundida; combinaçäo de dura e plástica e de dura e fundida. As principais conclusöes foram: a cera rosa provoca alteraçöes na posiçäo dos dentes durante a montagem; as alteraçöes säo minimizadas quando o aquecimento é uniforme, sem atingir a temperatura de fusäo; as maiores alteraçöes ocorrem na regiäo dos molares, seguida da dos pré-molares e dos incisivos; as grandezas das alteraçöes variam conforme a marca da cera


Subject(s)
Waxes/analysis , Denture, Complete/standards , Dental Impression Materials/analysis , Inlay Casting Wax/analysis
6.
Rev. odontol. UNESP ; 12(1/2): 129-32, jan.-dez. 1983. tab
Article in Portuguese | LILACS, BBO - Dentistry | ID: lil-187475

ABSTRACT

Verificou-se o efeito do tratamento superficial do modelo de cera com o alquil benzeno sulfonato de sódio a 11 por cento na adaptaçäo de 2 revestimentos, um à base de cristobalita e outro, de quartzo. O método utilizado foi o da mensuraçäo do ângulo de contacto formado entre a cera e os revestimentos, estando a superfície da cera antes da inclusäo, tratada com detergente e deixada molhada, e, tratada, porém seca. O ângulo formado foi avaliado através de um microscópio de mensuraçäo Carl Zeiss com dispositivo apropriado. Verificou-se que o alquil benzeno sulfonato de sódio a 11 por cento, melhora a adaptaçäo do revestimento à base de quartzo, porém näo interfere na do revestimento à base de cristobalita, e que näo há superioridade de um método de tratamento sobre o outro, isto é, estando a superfície da cera molhada ou seca


Subject(s)
Inlay Casting Wax/administration & dosage , Inlay Casting Wax/analysis , Dental Casting Investment/analysis , Benzenesulfonates/administration & dosage , Benzenesulfonates/adverse effects
8.
Shika Rikogaku Zasshi ; 22(57): 63-96, 1981 Jan.
Article in English | MEDLINE | ID: mdl-7021714

ABSTRACT

In order to obtain information on the behavior of wax pattern distortion and to reveal its mechanism, the following experiments have been conducted: measurements of fundamental properties including distribution of molecular weight, crystal structure, phase transition, and viscosity, and investigation of the crystal orientation and recovery phenomena. If the wax is deformed plastically at higher temperatures, transformation appears to be a smooth transition from an isotropic distribution of the crystal orientation to an arranged structure. In the case of uniaxial compression, the c-axes are rearranged parallel to the compressed direction and the b-axes and a-axes are randomly oriented in the plane normal to the c-axes. This preferred orientation is due to the crystal rotation. The degree of preferred orientation increases with the increase in compression ratio over all temperatures between 35 degrees C and 55 degrees C. Above 45 degrees C, the degree of orientation decreases with an increase in temperature despite the equal compression ratio. From this fact, the degree of orientation is associated with the crystallinity at deformation temperatures as well as the degree of deformation. The preferentially oriented specimen expands greatly in the direction parallel to the molecular chain axis and shrinks to a great extent in the direction perpendicular to the chain axis. This anisotropy is caused mainly by the recovery. Moreover, the extent of recovery is associated closely with the degree of the preferred orientation. The dimensional change due to the recovery is extraordinarily large (30 to 40%) in comparison with the normal thermal expansion from room temperature to 45 degrees C (approximately 1.2%). This large extent of recovery is explained by the rubber-like deformation in the amorphous region.


Subject(s)
Inlay Casting Wax , Crystallization , Crystallography , Hot Temperature , Inlay Casting Wax/analysis , Molecular Weight , Polymers , Spectrophotometry, Infrared , Temperature , Thermodynamics , Viscosity , X-Ray Diffraction
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