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VOLUME 9 , ISSUE 3 ( May-June, 2018 ) > List of Articles

ORIGINAL RESEARCH

Effect of Different Layering Techniques on Shear Bond Strength of Microhybrid and BulkFill Nanohybrid Composite Resin: An in vitro Study

Abhilash Abdul Latheef, Ibrahim Yahya A Alsalhi, Abdulrahman Saad F Alasmari, Khaled Abduh M Alrabaei, Abdulrahman Ahmed A Alshehri, Anshad Mohamed Abdulla

Keywords : Bond strength, Composites, Layering techniques

Citation Information : Latheef AA, Alsalhi IY, Alasmari AS, Alrabaei KA, Alshehri AA, Abdulla AM. Effect of Different Layering Techniques on Shear Bond Strength of Microhybrid and BulkFill Nanohybrid Composite Resin: An in vitro Study. World J Dent 2018; 9 (3):231-234.

DOI: 10.5005/jp-journals-10015-1539

License: CC BY-SA 4.0

Published Online: 00-06-2018

Copyright Statement:  Copyright © 2018; Jaypee Brothers Medical Publishers (P) Ltd.


Abstract

Aim: To compare the shear bond strength of microhybrid and BulkFill composite, when they are placed under three different incremental curing techniques: gingival-occlusal layering (horizontal), wedge-shaped layering (oblique), and bulk technique. Materials and methods: A flat dentinal surface of 60 teeth was prepared by removing 1.5 to 2.0 mm of their occlusal surfaces with the help of single-sided diamond disk for testing. These samples were randomly divided into two groups of 30 samples each: group I for microhybrid composite (Filtek Z250, 3M ESPE, St. Paul, Minnesota, USA) and group II for BulkFill Filtek composite resin (3M ESPE, St. Paul, Minnesota, USA). The two groups were further divided into three subgroups based on the layering techniques (group I—bulk technique, group II— horizontal layering, and group III—oblique layering techniques). These specimens were loaded in a universal testing machine at a speed of 0.5 mm/minute till failure for determining the shear bond strength. The modes of failures of each group were observed under a scanning electron microscope (SEM), and analysis of variance (ANOVA) and t-value calculation analysis was applied. Results: The statistical analysis showed that there was significant difference between BulkFill and microhybrid composite and also between different layering techniques (p < 0.05). Conclusion: The highest shear bond strength was observed for BulkFill when compared with microhybrid composite resin. The BulkFill bulk technique has the highest bond strength followed by BulkFill oblique layering and microhybrid oblique layering techniques. Clinical significance: BulkFill composites might be the material of choice for restoring cavities where procedural time is of concern, especially in pediatric, geriatric, and apprehensive patients where the treatment time should ideally be kept short.


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