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:: Volume 25, Issue 3 (7-2013) ::
J Iran Dent Assoc 2013, 25(3): 155-161 Back to browse issues page
Effect of Trenched Zirconia Bar on Flexural Strength of IPS-Empress 2 Ceramic
Hamid Kermanshah1 , Sepideh Soroor Homayoon2 , Sholeh Ghabraei * 3, Naeim Berijani4
1- Member of Dental Research Center and Laser Research and Assistant Professor, Department of Operative Dentistry, School of Dentistry, Tehran University of Medical Science. Tehran, Iran
2- Resident of Department of, Pediatric Dentistry, School of Dentistry, Babol University of Medical Sciences. Babol, Iran
3- Assistant Professor, Department of Endodontics, School of Dentistry, Tehran University of Medical Sciences. Tehran, Iran , sholehghabraei@yahoo.com
4- Resident of Prosthodontic, Department of, School of Dentistry, Shahid Beheshti University of Medical Sciences. Shahid Beheshti, Iran
Abstract:   (11342 Views)
    Background and Aim : In the recent years, inlay-retained fixed partial dentures(FPDs)have gained attention due to the preservation of tooth structure and their conservative tooth preparation. The wettability of IPS2 ceramic surfaces can be increased by acid etching enhancingtheir bond to resin cement. High-strength ceramics cannot be etched due to the high resistance of alumina and zirconia. Inadequate bond between the zirconia and resin cement in zirconia-based FPDs leads to unequal stress distribution on the surface and consequent debonding and failure of the inlay-retainer. This study aimed to evaluate the effect of a trenched zirconia bar on the flexural strength of IPS-Empress 2 ceramic core .

  Materials and Methods : In this experimental study, 21 ceramic specimens measuring 3x4x25 mm were divided into three groups:

  Group 1 was the control group and fabricated from In-Ceram alumina ceramic

  Group 2 specimens were fabricated from IPS-Empress 2 ceramic

  Group 3 specimens were fabricated from IPS-Empress 2 and had an embeddedtrenched zirconia bar at the bottom

  Specimens were subjected to three point flexural test with 15 mm support span at a cross head speed of 0.5 mm/min. The fracture forces were recorded and data were statistically analyzed using ANOVA and Tukey’s test. The fracture surfaces were evaluated with an electron microscope .

  Results: The flexural strength of specimens was 302.66 in group 1, 187.25 in group 2 and 247.89 MPa in group 3. Flexural strength of In-Ceram specimens was significantly higher than that of IPS2 (P<0.019) but no difference existed between In-Ceram and IPS2 with an embeddedtrenched zirconia bar. Therefore, use of trenched zirconia bar at the bottom of specimens had limited effects on increasing their flexural strength ).

  Conclusion : Flexural strength of IPS-Empress 2 specimenswith an embeddedtrenched zirconia bar was equal to that of the other two groups. Although the flexural strength value of the mentioned group was higher than that of IPS-Empress 2 specimens without the bar and lower than that of In-Ceram alumina specimens, these differences were not statistically significant .

Keywords: Three point flexural test, dental ceramic, lithium disilicate glass ceramic, core material, electron microscopy
Full-Text [PDF 837 kb]   (2300 Downloads)    
Type of Study: Original | Subject: Restorative Dentistry
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Kermanshah H, Soroor Homayoon S, Ghabraei S, Berijani N. Effect of Trenched Zirconia Bar on Flexural Strength of IPS-Empress 2 Ceramic . J Iran Dent Assoc 2013; 25 (3) :155-161
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Volume 25, Issue 3 (7-2013) Back to browse issues page
Journal of Iranian Dental Association

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