Chinese Journal of Tissue Engineering Research ›› 2010, Vol. 14 ›› Issue (29): 5391-5394.doi: 10.3969/j.issn.1673-8225.2010.29.018

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Influence of polyurethane sealant on shear bond strength of ceramic and dentin

Liang Feng-lin1, Chen Xiang-tao1, Liu Yan-li2, Li Jin-xian3, Chen Lin4   

  1. 1 Department of Prosthetic Dentisty, Second Affiliated Hospital of Jiamusi University, Jiamusi   154002, Heilongjiang Province, China; 2 Out-patient Clinics of Stomatology, Dalian Medical University, Dalian  116027, Liaoning Province, China; 3 Department of Conservative Dentistry & Endodontics, Second Affiliated Hospital of Jiamusi University, Jiamusi  154002, Heilongjiang Province, China; 4 Department of Stomatology, Sixth Affiliated Hospital of Jiamusi University, Jiamusi   154004, Heilongjiang Province, China
  • Online:2010-07-16 Published:2010-07-16
  • Contact: Chen Xiang-tao, Master’s supervisor, Professor, Department of Prosthetic Dentisty, Second Affiliated Hospital of Jiamusi University, Jiamusi 154002, Heilongjiang Province, China chenxiangtao0298@163.com
  • About author:Liang Feng-lin★, Studying for master’s degree, Department of Prosthetic Dentisty, Second Affiliated Hospital of Jiamusi University, Jiamusi 154002, Heilongjiang Province, China liangfenglin1981@163.com
  • Supported by:

    Jiamusi University Project of Science and Technology during 2009, No.S2009-047*

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Abstract:

BACKGROUND: Polyurethane sealant system has been developed in recent years as newly adhesive materials in medical field, it has strong bonding property with many medical materials. However, studies on stomatology are few.
OBJECTIVE: To evaluate the effectiveness of polyurethane sealant on shear bond strength between glass ceramic and human dentin.
METHODS: Freshly extracted non-carious human premolars were collected to prepare flat mesial and distal dentin surface with diamond bur. Totally 48 ceramic discs (3 mm in diameter, 3 mm in height) were fabricated and then cementated on dentin bonding surface using polyurethane sealant, Variolink Ⅱ and Panavia F, respectively. Eight specimens in each group were stored in 37 ℃ water for 24 hours, directly receiving shearing test, while the other 8 specimens in each group were additionally thermocycled for 500 times before shear bond strength test. The treated dentin surface was examined with scanning electronic microscopy.
RESULTS AND CONCLUSION: Polyurethane group showed the highest bond strength before thermocycling, then Variolink Ⅱ group and Panavia F group the lowest. Group C had the lowest bond strength. After thermocycling, polyurethane group showed the highest bond strength before thermocycling, then Variolink Ⅱ group, and Panavia F group the lowest bond strength. The bond strength of all groups significantly decreased after thermocycling (P < 0.05). Scanning electron microscopy observation revealed that resin tags were not obvious on the interface between dentin and medical polyurethane sealant, while the formation of resin tags could be easily defected on the interfaces between dentin and other two resin cements. The polyurethane sealant has a higher bond strength to dentin than those based on self-etch bonding system and etch-rinsing resin cements.

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