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Showing 2 results for Nanoleakage
Comparison of nanoleakage in composite restorations following application of self-etch and total-etch adhesives in primary and permanent teeth
A. Makarem , M. Ghavam Nassiri , M. Esmaili ,
Volume 19, Issue 4 (1-2007)
Abstract

Background and Aim: Nanoleakage can cause discoloration around restoration margins, secondary caries, postoperative sensitivity and finally loss of restoration, thus adequate hybrid layer is of primary importance in prevention of nanoleakage in adhesive restorations. Because of structural differences between primary and permanent dentin, evaluation of nanoleakge in primary teeth is very important. The aim of this study was to evaluate the nanoleakage in composite restorations following application of self -etch and total-etch adhesives in primary and permanent teeth.

Materials and Methods: In this experimental study, Cl V cavities were prepared in buccal surfaces of 20 extracted primary molars and 20 extracted premolars. Each group was divided into 2 subgroups: In group (A), Gluma One Bond and in group (B), iBond adhesive materials were applied. After silver nitrate staining, specimens were mesiodistally sectioned and polished and then SEM examination was carried out to measure the nanoleakage .Data were analyzed statistically using, ANOVA and Duncan tests with p<0.05 as the limit of significance.

Results: Factors tested had no significant effect on each other. Primary teeth showed more nanoleakage than permanent teeth (P<0.05). Mean nanoleakage was significantly higher in cervical than occlusal margins (P<0.05) and also in iBond than in Gluma One Bond in primary teeth (P<0.05). In permanent teeth, the lowest nanoleakage was observed in Gluma One Bond.

Conclusion: The result of this study indicates that the use of total etch dentin adhesives (Gluma One Bond) in bonded restorations results in less nanoleakage in primary and permanent teeth.


Effect of hydrophobic resin following different dentin bondings application on nanoleakage of composite restorations
Mohammad Javad Moghadas, Ehsan Rohani, Sara Majidinia, Najmeh Ojrati, Negin Vatanparast,
Volume 31, Issue 4 (1-2019)
Abstract
Background and Aims: The aim of the present study was to evaluate the effect of applying hydrophobic resin after use of different generation of the bonding systems on nanoleakage.
Materials and Methods: 20 third molar teeth were selected. The teeth were randomly divided into 4 groups of 5, each was treated using the fourth, fifth, sixth, and seven generation of dentin bonding. Then, the crown of teeth was sectioned from the CEJ region and each specimen was divided into two halves with mesiodistal cut, one half for the application of dentin bonding without the addition of a hydrophobic resin, and the other for the same dentin bonding by the addition of a hydrophobic resin. Afterwards, the specimens were restotred by composites. After placement of specimens in silver nitrate, the amount of nanoleakage was evaluated by SEM. Data were analyzed using a repeated measurement statistical analysis (α=0.05).
Results: The use of hydrophobic resins decreased nanoleakage and range of variations in all groups (P<0.05). This reduction was greater for total-etch dentin bonding. Higher degree of nanoleakage occurred in total-etch dentin bonding in most evaluated areas. In general, Clearfil S³ bond showed the least percent of the nanoleakage.
Conclusion: All dentin bonding systems showed some degree of reduction in nanoleakage after hydrophobic layer application and the reduction was greater in Total-etch adhesives systems.

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