Effect of different bonding agents on prevention of enamel demineralization around orthodontic brackets.
BACKGROUND
Demineralization around the bracket is an undesired side effect of orthodontic treatment. The aim of this in-vitro study was to evaluate the efficacy of 5 bonding agents to prevent enamel demineralization. Two quantification methods were used.


METHODS
Eighty-five extracted teeth were randomly allocated to 5 groups: (1) Transbond Plus SEP and Transbond XT (both, 3M Unitek, Seefeld, Germany), (2) 37% phosphoric acid, Pro Seal (Reliance Orthodontic Products, Itasca, Ill) and Transbond XT, (3) Clearfil Protect Bond (Kuraray Medical, Okayama, Japan) and Transbond XT, (4) 37% phosphoric acid and Light Bond (Reliance Orthodontic Products), and (5) Ortho Conditioner and Fuji Ortho LC (both, GC, Tokyo, Japan). In-vitro caries was created by pH cycling for 30 days. After demineralization, the teeth were scanned with a commercial cone-beam microtomographic system. Then the teeth were examined by polarized light microscopy.


RESULTS
The 2 methods of examination showed significant differences among the 5 groups according to lesion depth and mineral loss (P < 0.01). The resin-modified glass ionomer cement (group 5) had the lowest values for lesion depth and mineral loss.


CONCLUSIONS
Fuji Ortho LC showed a significantly smaller lesion depth and less mineral loss compared with the other materials. The cone-beam microtomographic system is suitable for evaluation of subsurface lesions and has considerable advantages.
Paschos
Ekaterini
E
Department of Orthodontics, Ludwig-Maximilians University, Munich, Germany. epaschos@med.uni-muenchen.de
Kleinschrodt
Thomas
T
Clementino-Luedemann
Tatiana
T
Huth
Karin C
KC
Hickel
Reinhard
R
Kunzelmann
Karl-Heinz
KH
Rudzki-Janson
Ingrid
I
D000134:Acid Etching, Dental / Q000379:methods; D002327:Cariostatic Agents / Q000008:administration & dosage; D054893:Cone-Beam Computed Tomography; D001840:Dental Bonding / Q000379:methods*; D005459:Fluorides / Q000008:administration & dosage; D005899:Glass Ionomer Cements / Q000737:chemistry; D006801:Humans; D016910:Orthodontic Brackets / Q000009:adverse effects*; D019279:Resin Cements / Q000737:chemistry; D017001:Tooth Demineralization / Q000000981:diagnostic imaging / Q000209:etiology / Q000517:prevention & control*; D055114:X-Ray Microtomography
D002327:Cariostatic Agents; D005899:Glass Ionomer Cements; D019279:Resin Cements; D005459:Fluorides