Análisis mediante microscopía óptica y microscopía electrónica de barrido de la interfase de cementación de núcleos procera-zirconio
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Fecha
2009
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Profesor/a Guía
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es
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Universidad Andrés Bello
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Licencia CC
Licencia CC
Resumen
Planteamiento del problema: El grosor de la línea de cementación en especial a nivel del margen
cervical puede influir en el éxito a mediano o largo plazo de una corona cementada.
Objetivos: Comparar mediante Microscopía Óptica y Microscopía Electrónica de Barrido el espesor
de la interfase de cementación a diferentes niveles de la preparación biológica para núcleos
Procera - zirconio utilizando diferentes agentes cementantes.
Materiales y Métodos: Se seleccionaron 50 premolares sanos, recientemente extraídos, libres de
caries y mantenidos constantemente hidratados los cuales fueron tallados para prótesis fija libre de
metal, las piezas fueron incluidas en un bloque acrílico para luego confeccionar mediante proceso
CAD-CAM núcleos de zirconio para cada una de ellas. Las preparaciones fueron divididas al azar
en 5 grupos de 1 O muestras cada uno, los grupos del 1 al 5 fueron cementados con RelyX ARC
(RA), Ketac Cem (KC), RelyX Unicem (RU), Multilink (ML) y Panavia F2.0 (PAN) respectivamente.
Se seleccionaron 40 muestras, 8 de cada cemento para el estudio de Microscopía Óptica y 1 O
muestras, 2 de cada cemento para MEB. Las muestras para MO fueron incluidas en cera de
inmersión y posteriormente cortadas con la máquina lsoMet obteniendo así un corte de 1 mm de
espesor para ser observada. Las muestras para MEB fueron inmersas en acrílico de autocurado y
luego cortadas en la máquina lsoMet para su posterior observación.
Resultados: Los valores de la observación con microscopía óptica fueron divididos en 3 grupos:
cervical, caras libres y oclusal. Los promedios para cervical fueron: RA (53.75µm); KC (20 µm); RU
(18.13µm); ML (31 .25µm); PAN (25.63µm); para caras libres: RA (1 00µm); KC (72.50µm); RU
(68.75µm); ML (66.88µm); PAN (63.13µm); para oclusal: RA (200µm); KC (130 µm); RU
(171 .25µm); ML (202.S0µm); PAN (186.25µm). Los resultados fueron sometidos al análisis de
varianza One-Way ANOVA y luego a una comparación por medio del método Tukey y se obtuvo lo
siguiente: a nivel cervical: se encontraron diferencias estadísticamente significativas entre los
grupos RA y los demás cementos, así como entre ML y RU (siendo RA y ML los con mayores
valores encontrados para cada comparación); a nivel de caras libres: se encontraron diferencias
estadísticamente significativas entre los grupos RA y los demás (siendo RA con los mayores
valores encontrados); a nivel oclusal: se encontraron diferencias estadísticamente significativas
entre los grupos KC y los demás cementos, así como entre RU con ML y RU con RA (siendo KC y
RU los con menores valores encontrados).
Conclusiones: Los cementos que requieren un acondicionamiento previo de la superficie dentaria
poseen un mayor grosor de la línea de cementación.
Statement of problem: The marginal and interna! fit of cemented crowns may influence the long term success for this kind of restorations. Purpose: To compare the thickness of the cementation line at different levels of Procera- zirconium copings cemented with different luting agents, using an optical light microscope (OM) and a scanning electron microscope (SEM). Materials and Methods: Fifty healthy and recently extracted human teeth (premolars) were selected and prepared according to the conventional protocol for Procera crowns, fixing the roots into an acrylic base, the prepared teeth were scanned for the confection of zirconium oxide copings using CAD-CAM technology. The preparations were randomly divided in 5 groups of 1 O teeth each and then the copings were cemented in the next order: Group 1: RelyX ARC (RA); Group 2 Ketac Cem (KC); Group 3 RelyX Unicem (RU); Group 4 Multilink (ML); Group 5 Panavia (PAN). 8 samples of each group were selected for the observation using the OM and the other 2 samples were used for the observation with the SEM. The copings for OM were included in wax using a dipping unit and the specimens for SEM were immersed in self-curing acrylic. AII the copings were prepared using the lsoMet precision saw for further observation. Results: The values of OM observation were divided into 3 groups: (1)cervical, (2)buccal/lingual and (3)occlusal; the average values for each site were: (1 )cervical: RA (53.75µm); KC (20 µm); RU (18.13µm); ML (31 .25µm); PAN (25.63µm); (2)buccal/lingual: RA (100µm); KC (72.50µm); RU (68. 75µm); ML (66.88µm); PAN (63.13µm); (3)occlusal: RA (200µm); KC (130 µm); RU (171 .25µm); ML (202.S0µm); PAN (186.25µm). The results were analyzed using the One-Way ANOVA analysis of variance and then compared using the Tukey's method, the results were as follow: at the cervical level, significant differences were detected between the values of RA and the other four cements and between ML and RU (RA and ML with the greater cementation line); at buccal/lingual significant differences were found between RA and the other groups (RA with the greater cementation line); at the occlusal level significant differences were found between KC and the other groups and between RU with ML and RU with RA (KC and RU being the lower values founded). Conclusions: The cements that require pre-conditioning of the tooth surface have a greater thickness of the cementation line.
Statement of problem: The marginal and interna! fit of cemented crowns may influence the long term success for this kind of restorations. Purpose: To compare the thickness of the cementation line at different levels of Procera- zirconium copings cemented with different luting agents, using an optical light microscope (OM) and a scanning electron microscope (SEM). Materials and Methods: Fifty healthy and recently extracted human teeth (premolars) were selected and prepared according to the conventional protocol for Procera crowns, fixing the roots into an acrylic base, the prepared teeth were scanned for the confection of zirconium oxide copings using CAD-CAM technology. The preparations were randomly divided in 5 groups of 1 O teeth each and then the copings were cemented in the next order: Group 1: RelyX ARC (RA); Group 2 Ketac Cem (KC); Group 3 RelyX Unicem (RU); Group 4 Multilink (ML); Group 5 Panavia (PAN). 8 samples of each group were selected for the observation using the OM and the other 2 samples were used for the observation with the SEM. The copings for OM were included in wax using a dipping unit and the specimens for SEM were immersed in self-curing acrylic. AII the copings were prepared using the lsoMet precision saw for further observation. Results: The values of OM observation were divided into 3 groups: (1)cervical, (2)buccal/lingual and (3)occlusal; the average values for each site were: (1 )cervical: RA (53.75µm); KC (20 µm); RU (18.13µm); ML (31 .25µm); PAN (25.63µm); (2)buccal/lingual: RA (100µm); KC (72.50µm); RU (68. 75µm); ML (66.88µm); PAN (63.13µm); (3)occlusal: RA (200µm); KC (130 µm); RU (171 .25µm); ML (202.S0µm); PAN (186.25µm). The results were analyzed using the One-Way ANOVA analysis of variance and then compared using the Tukey's method, the results were as follow: at the cervical level, significant differences were detected between the values of RA and the other four cements and between ML and RU (RA and ML with the greater cementation line); at buccal/lingual significant differences were found between RA and the other groups (RA with the greater cementation line); at the occlusal level significant differences were found between KC and the other groups and between RU with ML and RU with RA (KC and RU being the lower values founded). Conclusions: The cements that require pre-conditioning of the tooth surface have a greater thickness of the cementation line.
Notas
Tesis (Cirujano Dentista, especialización en Clínica Integral del Adulto)
Palabras clave
Cemento Dental, Microscopía, Microscopía Electrónica de Barrido