IADR Abstract Archives

Effect of Cement Types and Restoration Surface Treatments on the Retention of Hybrid Ceramic Molar Endocrown: an Invitro Study

Objectives: The objective of this study was to compare two treatments of the inner surface of endocrowns made of hybrid ceramic (VITA ennamic)and two types of cements in terms of crown retention in molar preparations representing the worst clinical condition (only 1mm remaining tooth structure above the CEJ). The hypotheses were that 1) the two cements would lead to similar crown retention values; 2) the surface treatment would improve retention regardless of the cement used.
Methods: The crowns of extracted first molar teeth were removed by a horizontal section 1 mm above the CEJ. standardized CAD / CAM endocrown restorations were fabricated. 6 groups(n=12) were tested involving two types of cements (Multilink; Self cured resin cement, HEMA based and Rely X ARC; Dual-cured, Bis-GMA based resin cement) and three surface treatments( no treatment as a control, air borne particle abrasion AA and hydroflouric acid HF).
After cementation, the specimens were stored in water at 37 °C for one week and then thermocycled. Retention test was performed at a crosshead speed of 0.5 mm/min until bond failure occurred.(fig.1).
Results: - Mean ± standard deviation of endocrown retention values(kgf) are shown below:-

For Multilink, contrrol was18.4± (2) Aa , AA was27.8± (11.6) A Ba and HF was 36.7± (18.1) Ba

For RelyX ARC, control was 20.7± (3.8) Aa, AA was 23.1± (6.3) and HF was Aa 23.8± (3.8) Aa


N.B: - For the same cement; Different capital letters indicate a significant difference (p≤ 0.05) between surface treatment types.
-For the same surface treatment; Different lowercase letters indicate a significant difference (p≤ 0.05) between the cement types.
Conclusions: 1- The type of resin cement (BIS-GMA- or HEMAbased) did not affect the endocrown retention values.
2- The conditioning of the hybrid ceramic endocrown inner surface by hydroflouric acid plus silanization was capable of improving the retention force for the HEMAbased cement.

2020 South East Asia Division Meeting (Virtual)

2020
P012
Prosthodontics Research
  • Sultan, Sherif  ( Jouf university , Sakaka , Saudi Arabia ;  Tanta university , Tanta , Egypt )
  • None
    Poster Session
    Poster 1
    Thursday, 11/26/2020 , 02:30PM - 03:00PM