Fracture Toughness of Nanohybrid and Hybrid Composites Stored Wet and Dry up to 60 Days
Journal Title: Journal of Dental Biomaterials - Year 2017, Vol 4, Issue 1
Abstract
ABSTRACT Statement of Problem: Patients’ demand for tooth-colored restoratives in the posterior region is increasing. Clinicians use universal nanohybrid resin composites for both anterior and posterior regions. There are few published reports comparing fracture toughness of nonohybrids and that of hybrid composite stored wet and dry. Objectives: To investigate the fracture toughness of three nanohybrids compared to that of a hybrid resin composite stored dry or wet up to 60 days, using four-point bending test. Materials and Methods: Four resin composites were used: three nanohybrids; Filtek Supreme (3M), Ice (SDI), TPH3 (Dentsply) and one hybrid Filtek P60 (3M). For each material, 40 rectangular notched beam specimens were prepared with dimensions of 30 mm × 5mm × 2mm. The specimens were randomly divided into 4 groups (n = 10) and stored at 37ºC either in distilled water or dry for 1 and 60 days. The specimens were placed on the four-point test jig and subjected to force (N) using universal testing machine loaded at a crosshead speed of 0.5mm/min and maximum load at specimen failure was recorded and KIc was calculated. Results: Three-way ANOVA showed a significant interaction between all the factors (all p < .0001). Except for TPH3, all tested materials showed significantly higher KIc when stored dry than stored wet (p < 0.05). After 1 day of dry storage, Ice showed the highest KIc (2.04± 0.32) followed by Filtek P60 and the lowest was for Filtek Supreme (1.39± 0.13) The effect of time on fracture toughness was material dependent. Conclusions: Wet storage adversely affected the fracture toughness of almost all materials. Keeping the restoration dry in the mouth may increase their fracture toughness. Therefore, using a coating agent on the surface of restoration may protect them from early water uptake and increase their strength during a time period.
Authors and Affiliations
M Sookhakiyana, S Tavanaa, Y Azarniaa, R Bagherib
Keywords
Related Articles
- EP ID EP246222
- DOI -
- Views 99
- Downloads 0
Comparison of Wear Resistance of Hawley and Vacuum Formed Retainers: An in-vitro Study
Statement of Problem: As a physical property, wear resistance of the materials used in the fabrication of orthodontic retainers play a significant role in the stability and long term use of the appliances. Objectives: To...
Effect of Three Common Desensitizers in Reduction of the DentinHypersensitivity after Periodontal Surgery
Statement of Problem: Dentin hypersensitivity is one of the most common c o m p l a i n t s of patients after periodontal treatments which occur after tissue shrinkage. Objectives: The aim of this study was to determine...
Development of a Method to Obtain More Accurate General and Oral Health Related Information Retrospectively
Statement of Problem: Early childhood is a crucial period of life as it affects one’s future health. However, precise data on adverse events during this period is usually hard to access or collect, especially in developi...
Comparison of Antibacterial Effect of Fluoride and Chlorhexidine on Two Cariogenic Bacteria: An in Vitro Study
Statement of problem: Dental plaque is the main source for dental caries and there is no proper vaccine that can affect dental plaques. Objectives: Daily use of an efficient anti-plaque product can be very beneficial in...
Gingival Retraction Methods for Fabrication of Fixed Partial Denture: Literature Review
Fixed dental prosthesis success requires appropriate impression taking of the prepared finish line. This is critical in either tooth supported fixed prosthesis (crown and bridge) or implant supported fixed prosthesis (so...