The collarless metal-ceramic crown

Goodacre, Charles J.; Roekel, Ned B. Van; Dykema, Roland W.; Ullmann, R. Brian

doi:10.1016/0022-3913(77)90004-x

Cited by 54 publications

(23 citation statements)

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“…Therefore, investigators have examined techniques for firing all-porcelain margins with platinum matrices, refractory dies, separating varnish, as well as wax or resin binders. 20,23,[25][26][27]29 Several studies 18,33 demonstrated with conventional porcelain-margin materials that rounded edges with rough and heterogenous surfaces were more likely to occur using direct lift-off techniques than with platinum matrix substrates. The direct liftoff technique requires shoulder-porcelain materials instead of conventional porcelain, because they fuse at a higher temperature (20 • C-30 • C higher than the regular body) and show greater resistance to pyroplastic flow.…”

Section: Discussionmentioning

confidence: 98%

Precision of Fit of Two Margin Designs for Metal‐Ceramic Crowns

Limkangwalmongkol

Chiche

Blatz

2007

Journal of Prosthodontics

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Section: Discussionmentioning

confidence: 98%

Precision of Fit of Two Margin Designs for Metal‐Ceramic Crowns

Limkangwalmongkol

Chiche

Blatz

2007

Journal of Prosthodontics

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“…1977, 8 mientras que en las que se realizaron de manera maquinada se obtuvieron convergencias de 6 grados como las sugeridas por Potts R.G. y Col. 1980.…”

Section: Discussionunclassified

“…7 Realizar este procedimiento a nivel cervical mejora los resultados estéticos siempre y cuando se respeten los márgenes estipulados que garanticen la resistencia de la cerámica. 8 Por lo tanto, se hicieron recomendaciones con respecto a los diseños de estructura que maximizan las características estéticas sin afectar la fuerza de restauraciones de cerámica y metal debido a la naturaleza frágil que presenta la cerámica, incluso si es reforzada puede conducir a la fractura, cuando se somete a fuerzas de cizalladura o de tensiones. 9 La cementación de las restauraciones indirectas es considerada como la parte fundamental en cuanto al éxito a largo plazo.…”

Section: Introductionunclassified

Comparación De La Resistencia a La Fuerza Traccional en Coronas Metal Cerámicas, Mediante El Uso De Dos Protocolos

Gallego¹

2018

oactiva

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Resumen OBJETIVO: Determinar la diferencia en la fuerza traccional necesaria para desalojar las coronas metal cerámica con collarless (hombro cerámico) sobre dientes naturales extraídos utilizando dos diferentes protocolos de preparación de sustrato dental y un mismo cemento resinoso autoadhesivo de curado dual. MATERIALES Y MÉTODOS: treinta y cinco dientes recién extraídos por indicaciones ortodonticas fueron almacenados mediante protocolos de conservación, de los cuales treinta fueron preparados por un mismo operador y cinco fueron maquinados en torno computarizado para recibir coronas metal cerámica collar less. La muestra fue distribuida de la siguiente manera: quince dientes para utilización de cementación con preparación del sustrato dental, quince dientes para la utilización de cementación sin preparación del sustrato dental y cinco dientes maquinados para la utilización de cementación sin preparación del sustrato dental. La muestra fue sometida en cada grupo a fuerza de desalojo traccional mediante la utilización de INSTRON R máquina de ensayos universales estableciendo resultados para cada uno, se realizó comparación entre ellos y finalmente se determinó el tipo de falla en la cementación (adhesiva o cohesiva) para cada muestra. Se establecieron promedios y desviación estándar, el nivel de confianza se estableció en 95 % y el nivel de significancia en 5 %. RESULTADOS: La medición de la fuerza de adhesión de las coronas permitió establecer que la resistencia a la tracción antes del desalojo si tuvo diferencias estadísticamente significativas (p<0.05) en al menos dos de los tres grupos, específicamente los grupos SP (control) y CP. Esto se obtuvo al aplicar la prueba no paramétrica de Kruskal-Wallis. CONCLUSIONES: Dentro de las limitaciones del presente estudio se puede concluir que las preparaciones cercanas a los 15 grados de convergencia oclusal que se obtienen al realizarlas de manera manual son aceptables para obtener una resistencia a la tracción adecuada de coronas metal cerámicas collarless cementadas con cemento RelyX U200 3M ESPE.Palabras clave: Retención de coronas, coronas collarless preparación dental, cemento de resina autoadhesivo. AbstractAIM Determine the difference in the tensile force needed to dislodge the metal ceramic crowns with collarless (CERAMIC SHOULDER) on extracted natural teeth using two different protocols for preparing dental substrate and the same dual-cure adhesive resin cement. MATERIALS AND METHODS: Thirty-five recently extracted for orthodontic indications were stored by conservation protocols, of which thirty were prepared by the same operator and five teeth were machined on computerized lathe to receive metal ceramic collar less crowns. The sample was distributed as follows: fifteen teeth for use cementing preparation of dental substrate, fifteen teeth using cement without preparing the dental substrate and five teeth machined for using unprepared cementing dental substrate. The sample was subjected in each group to force tensile eviction using INSTRONR machine unive...

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“…The metal collar serves as a truss that strengthens the casting and enables it to resist the deformation during the ceramic firing cycles. But it produces dark line or shadow beneath the gingival tissue hampering the esthetic appearance 4. Thus, the alternate designs of metal framework substructure were developed.…”

Section: Introductionmentioning

confidence: 99%

“…O'Boyle et al6 suggested that the reduction in 1 mm of labial metal framework diminishes the darkening effect and also enhances esthetics without compromising fracture strength of restoration. Goodacre4 suggested that fabrication of the metal ceramic restoration without the cervical metal collar so that the structural advantages of metal for strength and esthetic qualities of porcelain were utilized in restoration. Prince and Donovan7 suggested that the esthetic demand in the region of the labial margin combined with the strength of conventional metal ceramic restoration may explain the increased popularity of collarless metal ceramic restoration.…”

Section: Introductionmentioning

confidence: 99%

Alternate metal framework designs for the metal ceramic prosthesis to enhance the esthetics

et al. 2011

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PURPOSEThe objective of the present study was to evaluate the effect of five different metal framework designs on the fracture resistance of the metal-ceramic restorations.MATERIALS AND METHODSFor the purpose of this study, the central incisor tooth was prepared, and the metal analogue of it and a master die were fabricated. The counter die with the 0.5 mm clearance was used for fabricating the wax patterns for the metal copings. The metal copings with five different metal framework designs were designed from Group 1 to 5. Group 1 with the metal collar, Group 2, 3, 4 and 5 with 0 mm, 0.5 mm, 1 mm and 1.5 mm cervical metal reduction respectively were fabricated. Total of fifty metal ceramic crown samples were fabricated. The fracture resistance was evaluated with the Universal Testing Machine (Instron model No 1011, UK). The basic data was subjected to statistical analysis by ANOVA and Student's t-test.RESULTSResults revealed that the fracture resistance ranged from 651.2 to 993.6 N/m2. Group 1 showed the maximum and Group 5 showed the least value.CONCLUSIONThe maximum load required to fracture the test specimens even in the groups without the metal collar was found to be exceeding the occlusal forces. Therefore, the metal frameworks with 0.5 mm and 1 mm short of the finish line are recommended for anterior metal ceramic restoration having adequate fracture resistance.

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The collarless metal-ceramic crown

Cited by 54 publications

References 1 publication

Precision of Fit of Two Margin Designs for Metal‐Ceramic Crowns

Precision of Fit of Two Margin Designs for Metal‐Ceramic Crowns

Comparación De La Resistencia a La Fuerza Traccional en Coronas Metal Cerámicas, Mediante El Uso De Dos Protocolos

Alternate metal framework designs for the metal ceramic prosthesis to enhance the esthetics

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