Chinese Journal of Tissue Engineering Research ›› 2012, Vol. 16 ›› Issue (3): 511-514.doi: 10.3969/j.issn.1673-8225.2012.03.029

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Retention performance of new type molar bands: Shear bond strengths and bonding of glass ionomer in three directions  

Fu Wei1, Zhou Shan1, Ding Yuan-feng1, Wang Pei-jun1, Xu Shi-qian2   

  1. 1Department of Orthodontics, the Second Affiliated Hospital of Harbin Medical University, Harbin  150086, Heilongjiang Province, China; 2School of Materials Science and Engineering, Harbin Institute of Technology, Harbin  150001, Heilongjiang Province, China
  • Received:2011-10-31 Revised:2011-12-06 Online:2012-01-15 Published:2012-01-15
  • Contact: Wang Pei-jun, Doctor, Chief physician, Master’s supervisor, Department of Orthodontics, the Second Affiliated Hospital of Harbin Medical University, Harbin 150086, Heilongjiang Province, China hydwpj@163.com
  • About author:Fu Wei★, Studying for master’s degree, Department of Orthodontics, the Second Affiliated Hospital of Harbin Medical University, Harbin 150086, Heilongjiang Province, China zhimayan0107@ 163.com Zhou Shan★, Master, Associate chief physician, Department of Orthodontics, the Second Affiliated Hospital of Harbin Medical University, Harbin 150086, Heilongjiang Province, China zhimayan0107@ 163.com
  • Supported by:

    Foundation of Education Department of Heilongjiang Province*; Foundation of Health Department of Heilongjiang Province*

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Abstract:

BACKGROUND: Molar band has important anchorage capacity during orthodontic process based on its high fixation strength. However, traditional molar band has many disadvantages.
OBJECTIVE: To compare the retention performance between new type molar bands and traditional molar bands.
METHODS: Extracted human lower third molars were collected and randomly divided into two groups, the control group was designed for traditional bands bonding with glass ionomer cements, and then the bands were subjected to vertical directional load; the experimental group was designed for new type bands bonding with resin-modified glass ionomer cements, and then the bands were subjected to three directional load (vertical, mesial and distal). The surface areas of the two types of bands were tested to calculate their maximum load of complete loss.
RESULTS AND CONCLUSION: Shear bond strengths of the experimental group were significantly stronger than those of the control group (P < 0.05). Shear bond strengths in mesial and distal directions were stronger than that in the vertical direction of the experimental group (P < 0.05). The combination of new type bands with resin-modified glass ionomer cements highlight the advantages of new type bands, and their retention performances are superior to the traditional bands bonding with glass ionomer cements. New type bands bonding to molars can produce a anchorage capacity.

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