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Paper Information

Journal:   FRONTIERS IN DENTISTRY (JOURNAL OF DENTISTRY OF TEHRAN UNIVERSITY OF MEDICAL SCIENCES)   JANUARY 2016 , Volume 13 , Number 1; Page(s) 29 To 39.
 
Paper: 

SHEAR BOND STRENGTH OF A RESIN CEMENT TO DIFFERENT ALLOYS SUBJECTED TO VARIOUS SURFACE TREATMENTS

 
 
Author(s):  EZOJI FARIBA*, TABARI KASRA, JABERI ANSARI ZAHRA, TORABZADEH HASSAN, KHARRAZIFARD MOHAMMAD JAVAD
 
* DENTAL MATERIALS RESEARCH CENTER, DEPARTMENT OF OPERATIVE DENTISTRY, FACULTY OF DENTISTRY, BABOL UNIVERSITY OF MEDICAL SCIENCES, BABOL, IRAN
 
Abstract: 

Objectives: Micromechanical retention of resin cements to alloys is an important factor affecting the longevity of metal base restorations. This study aimed to compare the bond strength and etching pattern of a newly introduced experimental etchant gel namely Nano Met Etch with those of conventional surface treatment techniques for nickel-chrome (Ni-Cr) and high noble alloys.
Materials and Methods: A total of 120 discs (8×10×15 mm) were cast with Ni-Cr (n=20), high noble BegoStar (n=50) and gold coin alloys (n=50). Their Surfaces were ground with abrasive papers. Ni-Cr specimens received sandblasting and etching. High noble alloy specimens (BegoStar and gold coin) received sandblasting, sandblasting-alloy primer, etching, etch-alloy primer and alloy primer alone. Cylindrical specimens of Panavia were bonded to surfaces using Tygon tubes. Specimens were subjected to micro-shear bond strength testing after storing at 37°C for 24 hours.
Results: In gold coin group, the highest bond strength was achieved after sandblasting (25.82±1.37MPa, P<0.001) and etching+alloy primer (26.60 ± 5.47 MPa, P<0.01). The lowest bond strength belonged to sandblasting+alloy primer (17.79±2.96MPa, P<0.01). In BegoStar group, the highest bond strength was obtained in the sandblasted group (38.40±3.29MPa, P<0.001) while the lowest bond strength was detected in the sandblast+alloy primer group (15.38±2.92MPa, P<0.001). For the Ni-Cr alloy, bond strength in the etched group (20.79±2.01MPa) was higher than that in the sandblasted group (18.25±1.82MPa) (P<0.01).
Conclusions: For the Ni-Cr alloy, etching was more efficient than sandblasting but for the high noble alloys, higher Au content increased the efficacy of etching.

 
Keyword(s): ALLOY PRIMER, SHEAR STRENGTH, RESIN CEMENTS
 
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