Korean J Orthod.  2009 Aug;39(4):234-247. 10.4041/kjod.2009.39.4.234.

Shear bond strength of rebonded ceramic brackets

• Sung JY
• Kang KH

• KMID: 1762579
• DOI: http://doi.org/10.4041/kjod.2009.39.4.234

Abstract

OBJECTIVE
The purpose of this study was to evaluate the shear bond strength of rebonded ceramic brackets according to each condition and find an appropriate method to rebond ceramic brackets with proper shear bond strength in clinical practice. METHODS: The study consisted of 12 experimental groups, according to the types of brackets, debonding methods, and treatment methods of the bracket base. Shear bond strength was measured, and adhesive residues left on the tooth surface were assessed. The base of the bracket was examined under scanning electron microscopy. RESULTS: The shear bond strength of the monocrystalline ceramic bracket group was significantly higher than thatof the polycrystalline bracket group with only sandblasting (p < 0.05). There was no significant difference in shear bond strength between groups that used rebonded brackets which were debonded with shear force and debonded with laser (p > 0.05). The shear bond strength of the sandblasted/silane group was significantly higher than that of the selectively grinded group with a low-speed round bur and the sandblasted only group (p < 0.001). The retentive structure was more presented in groups where laser was applied than in groups where shear force was applied to debond brackets prior to rebonding. The bracket bases which were treated before rebonding presented smoother surfaces than new brackets. CONCLUSIONS: Shear bond strength could be increased by applying a silane coupling agent after sandblasting before rebonding. Also, the bond strength of the selectively grinded group with a low-speed round bur and the sandblasted group showed acceptable bond strength for clinical orthodontic treatment.

Keyword

Rebonding; Ceramic bracket; Shear bond strength

MeSH Terms

Adhesives
Ceramics
Microscopy, Electron, Scanning
Tooth
Adhesives
Ceramics

Figure

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  Fig 1 A, Experimental set-up for shear bond strength measurement; B, lasing positions (▴). Notice that the lasing direction is vertical to the slot.

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  Fig 2 SEM images of the new ceramic bracket base. A, B, MISO™ (Original magnification: 25, 250 times, respectively; scale bar: 1 mm, 100 µm, respectively); C, D, Transcend™ series 6000 (Original magnification: 25, 250, respectively; scale bar: 1 mm, 100 µm, respectively).

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  Fig 3 Comparison of SEM images of the ceramic bracket base debonded by shear force using universal testing machine (A-D) and by laser (E-H). Lasing positions (arrow). A, B, E, F, MISO™ (Original magnification: 25, 250 times, respectively; scale bar: 1 mm, 100 µm, respectively); C, D, G, H, Transcend™ series 6000 (Original magnification: 25, 250 times, respectively; scale bar: 1 mm, 100 µm, respectively).

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  Fig 4 Comparison of SEM images of the ceramic bracket base grinded selectively with low-speed round bur after being debonded by shear force using universal testing machine (A-D) and by laser (E-H). A, B, E, F, MISO™ (Original magnification: 25, 250 times, respectively; scale bar: 1 mm, 100 µm, respectively); C, D, G, H, Transcend™ series 6000 (Original magnification: 25, 250 times, respectively; scale bar: 1 mm, 100 µm, respectively).

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  Fig 5 Comparison of SEM images of the ceramic bracket base sandblasted after being debonded by shear force using universal testing machine (A-D) and by laser (E-H). Lasing positions. A, B, E, F, MISO™ (Original magnification: 25, 250 times, respectively; scale bar: 1 mm, 100 µm, respectively); C, D, G, H, Transcend™ series 6000 (Original magnification: 25, 250 times, respectively; scale bar: 1 mm, 100 µm, respectively).

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  Fig 6 Comparison of SEM images of the ceramic bracket base sandblasted and coated with silane after being debonded by shear force using universal testing machine (A-D) and by laser (E-H). Lasing positions. A, B, E, F, MISO™ (Original magnification: 25, 250 times, respectively; scale bar: 1 mm, 100 µm, respectively); C, D, G, H, Transcend™ series 6000 (Original magnification: 25, 250 times, respectively; scale bar: 1 mm, 100 µm, respectively).

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