Chinese Journal of Tissue Engineering Research ›› 2010, Vol. 14 ›› Issue (29): 5383-5386.doi: 10.3969/j.issn.1673-8225.2010.29.016

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Influence of non-precious porcelain alloys on bond strength of restorative composite resins after intra-oral sandblasting

Qiu Jing, Chen Ya-ming, Feng Li-jun   

  1. Department of Prosthodontics, Stomatological Hospital of Jiangsu Province, Nanjing   210029, Jiangsu Province, China
  • Online:2010-07-16 Published:2010-07-16
  • Contact: Che Ya-ming, Professor, Chief physician, Department of Prosthodontics, Stomatological Hospital of Jiangsu Province, Nanjing 210029, Jiangsu Province, China Yaming_chen@yahoo.com
  • About author:Qiu Jing★, Master, Attending physician, Lecturer, Department of Prosthodontics, Stomatological Hospital of Jiangsu Province, Nanjing 210029, Jiangsu Province, China shear.qiu@163.com
  • Supported by:

    Co-operation Science Research Funds with Kuraray, No. 22008002*

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Abstract:

BACKGROUND: Several researches have studied the surface treatment and resin bond strength on the fractured porcelain surface. However, clinical observations show that most of the porcelain fractured cases are more or less exposed in the metal substrates, and there are little studies about surface treatment and resin bond strength on the widely used non-precious metal substrates, which include nickel-chromium (Ni-Cr) and cobalt-chromium (Co-Cr) alloys.
OBJECTIVE: To study the surface roughness and the bond strength of non-precious porcelain alloys and restorative composite resins after intra-oral sandblasting.
METHODS: Ni-Cr alloy specimens and Co-Cr alloy specimens were fabricated and randomly divided into 4 groups: Ni-Cr group, Ni-Cr sandblasted group, Co-Cr group, Co-Cr sandblasted group. Subsequent to intra-oral sandblasting, the surface roughness of specimens in each group was measured. Using Clearfil Repair kits, specimens’ surfaces were bonded to restorative composite resin cylinders. After specimens were stored at 37℃ in distilled water for 24 hours, shear bond strengths were measured and fracture surfaces were visually analyzed using the stereomicroscope and scanning electron microscopy.
RESULTS: Ni-Cr sandblasted group and Co-Cr sandblasted group showed significant higher surface roughness and shear bond strength than Ni-Cr group and Co-Cr group respectively (P < 0.05). Under the stereomicroscope, all specimens of Ni-Cr group and Co-Cr group revealed adhesive failures, whereas majority of Ni-Cr sandblasted group and Co-Cr sandblasted group revealed adhesive failures and minority of them revealed combination failures. Scanning electron microscopy images showed that resin-metal fracture surfaces of Ni-Cr group and Co-Cr group had few remnants of composite resin, and those of Ni-Cr sandblasted group and Co-Cr sandblasted group had lots of small embedded remnants of composite resin. Intra-oral sandblasting could enhance the surface roughness and shear bond strength of non-precious porcelain alloys and restorative composite resins.

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