Influencia de la angulación coronoradicular del sistema espiga-muñón colado en la resistencia a la fractura del remanente dentario
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Fecha
2011
Autores
Profesor/a Guía
Facultad/escuela
Idioma
es
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Universidad Andrés Bello
Nombre de Curso
Licencia CC
Licencia CC
Resumen
El propósito de este estudio fue determinar si el cambio en la angulación
corono-radicular del SEM colado incide en la resistencia a la fractura de piezas
dentarias. Se utilizaron 40 incisivos mandibulares de especie bovina, los cuales
fueron tratados con terapia de endodoncia, luego se realizó la desobturación
endodóntica hasta obtener un sellado apical de 3 mm. Se realizaron SEM
colados con una aleación base de cromo-níquel, previa realización de un
patrón acrílico. Se dividieron en cuatro grupos, los cuales correspondían a
angulaciones corono-radiculares de 190º, 200º, 210º y 180º (control). Los SEM
colados fueron cementados usando cemento de vidrio ionomero.
Las muestras fueron sometidas a prueba en un tensiómetro, utilizando
un punzón esférico de diámetro equivalente a 2 mm que simulaba el punto de
contacto con la pieza dentaria antagonista en una angulación de carga de 130°
(angulación interincisiva promedio). Las muestras fueron sometidas a una
carga con una velocidad de 20 mm/minuto, la cual empezó en O N y llegó hasta
donde el tensiómetro percibiera un cambio en la resistencia de la muestra. La fuerza promedio en la que se produjo la fractura fue: 190º= 962, 43 N
± 101, 41 (DS); 200º= 638, 41 N ± 66, 14 (DS); 210º= 378, 68 N ± 26,63 (DS) y
180º= 1.474, 17 N ± 110, 83 (DS). Se encontraron diferencias significativas
entre los cuatro grupos (P < 0,0005). La fuerza promedio en la que ocurrió la
fractura dentaria fue menor cuando la angulación del SEM se alejó del eje axial
del diente (180°). Diferencias significativas en la resistencia a la fractura después de la rehabilitación de dientes con tratamiento endodóntico y posterior
uso de un SEM colado pueden ocurrir como resultado de diferentes
angulaciones corono-radiculares de dicho sistema.
The purpose of this study was to determine if the changing post-restored teeth at different angles of crown-root angulation would affect their fracture resistance. Fourty bovin mandibular incisors were treated endodontically to within 3.0 mm of the apex. Post and core cast were fabricated using an alloy of chromium-nickel base upon completion of a standard acrylic. The teeth each were divided into four groups, which corresponded to crown-root angulation of 190, 200, 210 and 180 degrees (control). The post and core were cemented using glass ionomer cement. The samples were tested in a tensiometer, using a 2.0 mm diameter spherical punch to simulating the contact with the antagonist tooth and a load angulation of 130 degrees. The samples were subjected to a load with a speed of 20 mm/min, which began at ON and reached where the tensiometer perceive a change in resistance of the sample. The average force at which fracture occurred was: 190 degrees = 962.43 N ± 101.41 (SO), 200 degrees= 638.41 N ± 66.14 (SO), 210 degrees = 378.68 N ± 26.63 (SO) and 180 degrees =1,474.17N±110.83 (SO). Significant differences were found between the groups (P<0.0005). The average force on the tooth fracture occurred was lower when the angle of post and core left the tooth long axis (180 degrees). Significant differences in fracture strength after rehabilitation of teeth with endodontic treatment and subsequent use of a cast post and core can occur from different angles crown-root of the post and core. KEYWORDS: crown-root angulation, cast, force of fracture.
The purpose of this study was to determine if the changing post-restored teeth at different angles of crown-root angulation would affect their fracture resistance. Fourty bovin mandibular incisors were treated endodontically to within 3.0 mm of the apex. Post and core cast were fabricated using an alloy of chromium-nickel base upon completion of a standard acrylic. The teeth each were divided into four groups, which corresponded to crown-root angulation of 190, 200, 210 and 180 degrees (control). The post and core were cemented using glass ionomer cement. The samples were tested in a tensiometer, using a 2.0 mm diameter spherical punch to simulating the contact with the antagonist tooth and a load angulation of 130 degrees. The samples were subjected to a load with a speed of 20 mm/min, which began at ON and reached where the tensiometer perceive a change in resistance of the sample. The average force at which fracture occurred was: 190 degrees = 962.43 N ± 101.41 (SO), 200 degrees= 638.41 N ± 66.14 (SO), 210 degrees = 378.68 N ± 26.63 (SO) and 180 degrees =1,474.17N±110.83 (SO). Significant differences were found between the groups (P<0.0005). The average force on the tooth fracture occurred was lower when the angle of post and core left the tooth long axis (180 degrees). Significant differences in fracture strength after rehabilitation of teeth with endodontic treatment and subsequent use of a cast post and core can occur from different angles crown-root of the post and core. KEYWORDS: crown-root angulation, cast, force of fracture.
Notas
Tesis (Cirujano Dentista, especialización en Clínica Integral del Adulto)
Palabras clave
Estética Dental, Fracturas Dentales, Angulación Coronoradicular