Purpose: The aim of this study is to investigate the presence and the extent of a possiblemarginal gap after the interposition of a flowable composite between the composite restorationand the dental structures (enamel and cementum). This technique is also used to eliminate theinfiltration in a zone of the cavity preparation that is frequently at a risk of secondary decay.Materials and Methods: Fifteen human premolars extracted for orthodontic reasons were usedfor the study. A cavity with mesial and distal margin in enamel and cementum was realizedin every tooth. The cavities were then restored with an adhesive system (ScotchBond 3MÔ)and composite (Filtek Supreme 3MÔ); and, a fine layer of flowable composite was applied inthe distal margin of each cavity. Scanning electron microscopy (SEM) in secondary electronimaging (S.E.I.) modality was used for the study and identifying the marginal gaps in thecomposite restorations. Data was investigated on the mesial and distal margin of each cavityat the restoration-enamel interface, and at the restoration-cementum interface. The interfaceswere divided in four groups: Group A (enamel/composite); Group B (enamel/flow/composite);Group C (cementum/composite); and, Group D (cementum/flow/composite).Results: By the comparison of the gap’s average width found in each group, it is evidencedthat the average width of the gap increases when the interface moves from the coronal to theradicular end (Group A 0,1 ± 0,4 μm Vs Group C 12,3 ± 11,6 μm; Group B 0,2 ± 0,8 μm VsGroup D 2,8 ± 6,6 μm). Correlating the measurements of the marginal gap’s average width amongthe Group A and Group B, no significant variations were obtained; and instead, on comparingGroup C with Group D, the gap’s average width decreases.Conclusion: The interposition of a low elastic modulus composite between the adhesive layerand the composite resin allows an improvement of the cementum-restoration interface by themeans of a lower shrinkage stress during polymerization.

Flowable resin and marginal gap on tooth third medial cavity involving enamel and radicular cement. SEM evaluation of two restoration techniques

CICCIU', Marco;
2012-01-01

Abstract

Purpose: The aim of this study is to investigate the presence and the extent of a possiblemarginal gap after the interposition of a flowable composite between the composite restorationand the dental structures (enamel and cementum). This technique is also used to eliminate theinfiltration in a zone of the cavity preparation that is frequently at a risk of secondary decay.Materials and Methods: Fifteen human premolars extracted for orthodontic reasons were usedfor the study. A cavity with mesial and distal margin in enamel and cementum was realizedin every tooth. The cavities were then restored with an adhesive system (ScotchBond 3MÔ)and composite (Filtek Supreme 3MÔ); and, a fine layer of flowable composite was applied inthe distal margin of each cavity. Scanning electron microscopy (SEM) in secondary electronimaging (S.E.I.) modality was used for the study and identifying the marginal gaps in thecomposite restorations. Data was investigated on the mesial and distal margin of each cavityat the restoration-enamel interface, and at the restoration-cementum interface. The interfaceswere divided in four groups: Group A (enamel/composite); Group B (enamel/flow/composite);Group C (cementum/composite); and, Group D (cementum/flow/composite).Results: By the comparison of the gap’s average width found in each group, it is evidencedthat the average width of the gap increases when the interface moves from the coronal to theradicular end (Group A 0,1 ± 0,4 μm Vs Group C 12,3 ± 11,6 μm; Group B 0,2 ± 0,8 μm VsGroup D 2,8 ± 6,6 μm). Correlating the measurements of the marginal gap’s average width amongthe Group A and Group B, no significant variations were obtained; and instead, on comparingGroup C with Group D, the gap’s average width decreases.Conclusion: The interposition of a low elastic modulus composite between the adhesive layerand the composite resin allows an improvement of the cementum-restoration interface by themeans of a lower shrinkage stress during polymerization.
2012
Cementum
flowable resins
shrinkage
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11769/553806
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