Comparaison de la résistance à l’arrachement de trois types de composites fluides à faible stress sous deux modes de polymérisation

Georges Haber, Maroun Ghaleb, Charbel Mansour, Louis Hardan

Abstract


The aim of this study was to compare the microtensile bond strength of three bulkfill composites with two polymerisation modes: continuous and progressive.
Twenty-four healthy human molars were occlusally reduced by 4 mm (Exakt
Technology Inc Kg of Norderstedt, Germany), etched with 35% phosphoric
acid for 15 seconds, then a layer of adhesive was applied. Each group received 1 type of bulkfill composite : 1) group 1 (n=6): Smart dentin replacement “SDR™” (Dentsply / Caulk®, Milford, DE, USA); 2) group 2 (n=6): Tetric N Ceram® bulk fill “TNC®” (Ivoclar, Vivadent, Schaan Liechtenstein), 3) group 3 (n=6): Filtek Bulkfill “FB” (3M, ESPE, Seefeld, Germany) and 4) group 4 (n=6): a nano-hybrid composite Z250 XT (3M,
ESPE, Seefeld, Germany). Each group underwent two types of polymerization (n = 3): continuous polymerization and ramping polymerization. Each tooth was then cut into sections of 1 mm2. Specimens were hooked to a universal machine YL-01 (YLE GmbH Waldstraße 1/1a, 64732 Bad König, Germany) and a pulling force was applied to each specimen at a speed of 1 mm/min. This study showed that with LED continuous polymerization mode or ramping polymerization mode, the average tearing force was significantly different between the 4 types of composites (p = 0.006 < 0.05, p < 0.0001, respectively). The mean value of tearing was the following: TNC® < FB <Z250XT < SDR™.
Finally, the average tearing force was significantly different between the
bulkfill composites when using the same type of polymerization. The value
of tearing is always lower in continuous polymerization in comparison to the
ramping polymerization.
SDR™ had the lowest value of retraction and polymerization stress when
compared to the TNC® and FB, resulting in a better adaptation of the restoration. Furthermore, while comparing the 2 types of polymerization, we
concluded that the ramping mode gives less retraction and polymerization
stress than the continuous mode, thereby, a better adaptation of restoration.

 

Résumé

Le but de ce travail était de comparer la résistance à l’arrachement de 3
types de composites fluides à faible stress sous 2 modes de photo-polymérisation : haute intensité continue et progressive.
Vingt-quatre molaires humaines, ont été réduites d’une hauteur occlusale
de 4 mm. (Exakt technologies Inc Kg of Norderstedt, Germany), mordancées et une couche d’adhésif a été appliquée. Les dents ont été réparties en 4 groupes. Chaque groupe a été obturé par un composite différent : 1) groupe 1 (n=6): Smart Dentin Replacement « SDR™ » (Dentsply / Caulk®, Milford, DE, USA) ; 2) groupe 2 (n=6): Tetric N Ceram® bulk fill « TNC® » (Ivoclar, Vivadent, Schaan, Liechtenstein) ; 3) groupe 3 (n=6) : Filtek ®Bulk fill « FB » (3M, ESPE, Seefeld, Germany), et 4) groupe 4 (n=6) : un composite nano-hybride Z250 XT (3M, ESPE, Seefeld, Germany). Chaque groupe a reçu 2 types de polymérisation (n=3) : une polymérisation continue et une polymérisation progressive. Chaque dent a été ensuite coupée en des sections de 1mm2 et chaque spécimen a été accroché à une machine universelle YL-01 (YLE GmbH Waldstraße 1/1a, 64732 Bad König, Germany). Une force d’arrachement a été exercée sur chaque spécimen à une vitesse de 1mm/min.
Cette étude a montré qu’avec le mode de polymérisation LED continu ou
LED progressif, la force moyenne d’arrachement était significativement
différente entre les 4 types de composites (p=0.006 <0.05l p<0.0001,
respectivement).
La force moyenne d’arrachement se présentait selon l’ordre suivant :
TNC®®< FB < Z250XT < SDR™. Enfin, la force moyenne d’arrachement
était significativement différente entre les composites fluides à faible stress au sein du même groupe de polymérisation. Les valeurs sont toujours plus petites dans la polymérisation constante que dans la polymérisation progressive.
Le SDR™ a présenté le minimum de rétraction de prise et de stress de
polymérisation lorsque comparé au TNC® et au FB, ce qui favorise une
meilleure étanchéité et une plus grande longévité de la restauration. Tandis que pour le mode de polymérisation, la lumière progressive a engendré moins de rétraction de prise et moins de stress de polymérisation, présentant ainsi une meilleure étanchéité et longévité de la restauration.

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