The korean journal of orthodontics (대한치과교정학회지)

The Korean Association Of Orthodontists (대한치과교정학회)
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The effect of bonded resin surface area on the detachment force of lingual bonded fixed retainers: An in vitro study

  • Lee, Il-Hong (Department of Orthodontics, Hallym University Sacred Heart Hospital, Hallym University Medical Center) ;
  • Lee, Jung-Hwan (Department and Research Institute of Dental Biomaterials and Bioengineering, College of Dentistry, Yonsei University) ;
  • Park, In-Young (Department of Orthodontics, Hallym University Sacred Heart Hospital, Hallym University Medical Center) ;
  • Kim, Ji-Hyun (Department of Orthodontics, Hallym University Sacred Heart Hospital, Hallym University Medical Center) ;
  • Ahn, Jang-Hoon (Department of Orthodontics, Hallym University Kangnam Sacred Heart Hospital, Hallym University Medical Center)
  • Received : 2013.02.14
  • Accepted : 2013.07.22
  • Published : 2014.01.25
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Abstract

Objective: The aims of this study were to evaluate the relationship between the detachment force and bonding resin surface are and to determine the resin bonding surface area that would provide adequate bonding strength with minimum resin volume. Methods: One hundred and sixty human premolars were randomly divided into 4 groups of 40 teeth each. The diameter of the resin surface area in each group was as follows: group 1, 1.5 mm; group 2, 2.5 mm; group 3, 3.5 mm; and group 4, 4.5 mm. Respond Dead Soft straight (length 0.0175 inch) was used to fabricate the retainers, and $Transbond^{TM}$ XT was used to fix the retainers to the tooth surfaces. A pair of teeth was embedded in acrylic blocks for each specimen. Thus, each group comprised 20 samples. Fixed retainers were bonded to the teeth, and vertical force was applied at the middle of wire. The force was measured using a universal testing machine. Results: The mean value of detachment force was the highest for group 4 ($102.38{\pm}2.92N$), followed by group 3 ($63.54{\pm}2.21N$), group 2 ($51.95{\pm}1.61N$), and group 1 ($24.14{\pm}1.38N$). Conclusions: The detachment force of lingual fixed retainers was significantly affected as the area of the resin bonding surface increased. Considering the minimum bonding strength of brackets, a resin bonding surface area with a diameter of 3.5 mm would provide adequate bonding strength.

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References

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