J Korean Acad Prosthodont.  2017 Jul;55(3):264-271. 10.4047/jkap.2017.55.3.264.

Comparison of shearbond strength between metal and indirect resin according to the different conditionings

• Choi SY
• Choi H
• Moon HS
• Shim JS
• Park YB
• Lee GW

• KMID: 2387198
• DOI: http://doi.org/10.4047/jkap.2017.55.3.264

Abstract

PURPOSE
The purpose of this study is to investigate the differences in bond strength of four different indirect composites to the gold alloy and Ni-Cr alloy according to type of metal surface treatment after water storage.
MATERIALS AND METHODS
Type IV gold alloy and Ni-Cr alloy were used for casting alloy while four types of indirect composite resins (Gradia, Tescera Sinfony and in;joy) were used in this study. Metal specimens were produced by casting and total of 240 specimens (60 specimens per one indirect composite group) were prepared. After bonding indirect composite resin and undergoing 24 hours of polymerization, customized jig was attached to the metal specimen and shear bond strength were measured using universal testing machine. Also, differences in shear bond strength before and after water storage for 240 hours were also measured.
RESULTS
In the measurement of shear bond strength according to the metal surface treatments, bead group showed high strength followed by loop and flatting group (P<.05). After being stored in water bath for 240 hours, Gradia showed statistically significant high bond strength compared to other indirect composite resins in all groups (P<.05).
CONCLUSION
Shearbond strength was found to be different according to type of metal surface treatment and type of metal used after storage in water. Further studies need to be developed for clinical practices as three are still problems of microleakage, stain or wear.

Keyword

Shear bond strength; Indirect composite resin; Metal; Gold alloy; Ni-Cr alloy

MeSH Terms

Alloys
Baths
Composite Resins
Polymerization
Polymers
Water
Alloys
Composite Resins
Polymers
Water

Figure

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  Fig. 1. Prepared gold alloy and Ni-Cr alloy specimens.

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  Fig. 2. Schematic diagram for measuring shear bond strength.

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  Fig. 3. Mean shear bond strength between metal surface treatments after 24 hours. (A) Mean shear bond strength of gold alloy specimens, (B) Mean shear bond strength of Ni-Cr alloy specimens.

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  Fig. 4. Mean shear bond strength between metal surface treatments after 240 hours. (A) Mean shear bond strength of gold alloy specimens, (B) Mean shear bond strength of Ni-Cr alloy specimens.

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  Fig. 5. Gold alloy specimen surfaces after shear bond strength measurement (In order of flatting, bead and loop).

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  Fig. 6. Ni-Cr alloy specimen surfaces after shear bond strength measurement (In order of flatting, bead and loop).

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