Effect of multiple firings on the shear bond strength of presintered cobalt-chromium alloy and veneering ceramic

被引:6
作者
Ashtiani, Alireza Hashemi [1 ]
Mardasi, Nahal [1 ]
Fathi, Amirhossein [2 ]
机构
[1] Ahvaz Jundishapur Univ Med Sci, Prosthodont Dept, Ahvaz, Iran
[2] Isfahan Univ Med Sci, Dent Mat Res Ctr, Dept Prosthodont, Esfahan, Iran
关键词
MECHANICAL-PROPERTIES; PORCELAIN; CAD/CAM;
D O I
10.1016/j.prosdent.2021.09.021
中图分类号
R78 [口腔科学];
学科分类号
1003 ;
摘要
Statement of problem. How multiple firing cycles may affect the oxide layer and, consequently, the shear bond strength of metal-ceramic restorations is unclear. Purpose. The purpose of this in vitro study was to determine the effect of multiple firings on the shear bond strength of porcelain to cobalt-chromium (Co-Cr) alloy. Material and methods. Forty cylinders (circle divide 6.8x9 mm) of a representative presintered Co-Cr alloy (Ceramill Sintron) were prepared with computer-aided design and computer-aided manufacturing (CAD-CAM) technology. After airborne-particle abrasion and polishing, the specimens were ultrasonically cleaned of surface contaminants. A circular surface (circle divide 4x2 mm) was veneered on each specimen with porcelain (VM13) after 3 firings (wash opaque, opaque, and dentin). The specimens were then randomly divided into 4 groups (n=10). The normal group underwent 3 firings. The other groups underwent an additional porcelain firing: the one plus firing group underwent 4 firings, the two-plus firing group underwent 5 firings, and the three-plus firing group underwent 6 firings. Next, the specimens were mounted in autopolymerized acrylic resin and tested in a universal testing machine and loaded at a crosshead speed of 0.5 mm/min at the metal-ceramic interface until fracture occurred. The average shear bond strength (MPa) was calculated by dividing the maximum fracture force (N) by the bonded surface of the specimens (mm(2)). The fracture patterns were observed microscopically and classified as adhesive, cohesive, or mixed. One-way ANOVA was used to determine differences between groups (alpha=.05). Results. No significant differences were found among the shear bond strengths of specimens after 3, 4, 5, and 6 porcelain firings (P>.05). The mean bond strength of all groups ranged from 30 to 34 MPa. The fracture pattern of all specimens was mixed, indicating that multiple firings had no significant effect on the failure pattern. Conclusions. Multiple porcelain firings under controlled conditions had no significant effect on the fracture pattern or shear bond strength of porcelain to a presintered Co-Cr alloy.
引用
收藏
页码:803.e1 / 803.e6
页数:6
相关论文
共 29 条
  • [1] Adhesion of porcelain to three-dimensionally printed and soft milled cobalt chromium
    Barazanchi, Abdullah
    Li, Kai Chun
    Al-Amleh, Basil
    Lyons, Karl
    Waddell, J. Neil
    [J]. JOURNAL OF PROSTHODONTIC RESEARCH, 2020, 64 (02) : 120 - 127
  • [2] Marginal and internal fit of pre-sintered Co-Cr and zirconia 3-unit fixed dental prostheses as measured using microcomputed tomography
    Daou, Elie E.
    Ounsi, Hani
    Ozcan, Mutlu
    Husain, Nadin Al-Haj
    Salameh, Ziad
    [J]. JOURNAL OF PROSTHETIC DENTISTRY, 2018, 120 (03) : 409 - 414
  • [3] Davidowitz Gary, 2011, Dent Clin North Am, V55, P559, DOI 10.1016/j.cden.2011.02.011
  • [4] The Effect of Multiple Firings on the Shear Bond Strength of Porcelain to a New Millable Alloy and a Conventional Casting Alloy
    Farzin, Mitra
    Giti, Rashin
    Asalforush-Rezaiye, Amin
    [J]. MATERIALS, 2018, 11 (04):
  • [5] Geramipanah F., 2001, J DENT MED, V14, P5
  • [6] Heidari B, 2013, J MASHHAD DENT SCH, V37, P301
  • [7] A comparative study on the bond strength of porcelain to the millingable Pd-Ag alloy
    Hong, Jun-Tae
    Shin, Soo-Yeon
    [J]. JOURNAL OF ADVANCED PROSTHODONTICS, 2014, 6 (05) : 372 - 378
  • [8] Hong MH., 2020, J PROSTHET DENT, DOI [10.1016/j.prosdent.2020.07.037, DOI 10.1016/J.PROSDENT.2020.07.037]
  • [9] Preliminary Evaluation of Mechanical Properties of Co-Cr Alloys Fabricated by Three New Manufacturing Processes
    Jang, Seong-Ho
    Lee, Dae-Ho
    Ha, Jung-Yun
    Hanawa, Takao
    Kim, Kyo-Han
    Kwon, Tae-Yub
    [J]. INTERNATIONAL JOURNAL OF PROSTHODONTICS, 2015, 28 (04) : 396 - 398
  • [10] Kassapidou Maria, 2017, Acta Biomater Odontol Scand, V3, P53, DOI 10.1080/23337931.2017.1360776