IADR Abstract Archives
Use of the Primer as a Way to Prevent the Gap or Detachment of Enamel Prism During the Photoactivation of the Orthodontic Resin. An in Vitro Study
Objectives: The objective of this study was to evaluate the interface enamel/resin in three methods of orthodontic bonding, with the variant of the employ or not the primer, than verify wich method keep the integrity of enamel and its union with the resin.
Methods: Were used 60 bovine teeth divided into 3 groups (n = 20): Group 1 – no primer; Group 2 – with primer no photoactived; Group 3 – with primer photoactived. After cleaned, all teeth were conditioned for 30 seconds, with phosphoric acid 37%. The group 1 didn t receive the primer. In the other groups the primer was used. A light jet of air was used to homogenize the layer and volatilize the solvents. The primer was polymerized for 10 seconds just in the group 3. Then all teeth received a layer of orthodontic resin of approximately 0.5 mm thick by 4 mm square. The orthodontic resin was polymerized for 20 seconds with the light incident perpendicular to the tooth, in order to promote a polymerization contraction towards the curing light. After photoactivation, the teeth were cut longitudinally to expose the enamel/resin interface. The surfaces was prepared for SEM examination (polished, dried and metalized). The groups were examined in SEM with 1000x magnification, at three different points in the image, randomly. It was assigned a score of 0 for absence of Gap and detachment, 1 for the presence of Gap. and 2 for the detachment occurrence.
Results: The results were analyzed using Kruskal-Wallis and Anova tests. The group 1 was significantly higher than other groups, in occurences of detachment and gaps. The groups 2 and 3 presented almost the same results between them, with few occurences. The SEM images show the standard of the interface when the primer is applied or not.
Conclusions: In light of this study, it can be affirmed that the use of the primer contributes to the reduction of gaps and detachments of enamel prisms. The attached images show an average pattern of the interfaces which reinforces the idea that the primer application contributes to the integrity of the dental enamel.
Methods: Were used 60 bovine teeth divided into 3 groups (n = 20): Group 1 – no primer; Group 2 – with primer no photoactived; Group 3 – with primer photoactived. After cleaned, all teeth were conditioned for 30 seconds, with phosphoric acid 37%. The group 1 didn t receive the primer. In the other groups the primer was used. A light jet of air was used to homogenize the layer and volatilize the solvents. The primer was polymerized for 10 seconds just in the group 3. Then all teeth received a layer of orthodontic resin of approximately 0.5 mm thick by 4 mm square. The orthodontic resin was polymerized for 20 seconds with the light incident perpendicular to the tooth, in order to promote a polymerization contraction towards the curing light. After photoactivation, the teeth were cut longitudinally to expose the enamel/resin interface. The surfaces was prepared for SEM examination (polished, dried and metalized). The groups were examined in SEM with 1000x magnification, at three different points in the image, randomly. It was assigned a score of 0 for absence of Gap and detachment, 1 for the presence of Gap. and 2 for the detachment occurrence.
Results: The results were analyzed using Kruskal-Wallis and Anova tests. The group 1 was significantly higher than other groups, in occurences of detachment and gaps. The groups 2 and 3 presented almost the same results between them, with few occurences. The SEM images show the standard of the interface when the primer is applied or not.
Conclusions: In light of this study, it can be affirmed that the use of the primer contributes to the reduction of gaps and detachments of enamel prisms. The attached images show an average pattern of the interfaces which reinforces the idea that the primer application contributes to the integrity of the dental enamel.
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