Bonding of brackets using a caries-protective adhesive patch.
OBJECTIVE
The purpose of this study was to assess the shear bond strength (SBS) of metal brackets when placed with a caries protective adhesive patch.


METHODS
Forty stainless steel brackets (Ormco) were bonded to 40 bovine enamel samples according to the following conditioning/bonding procedures using a resin-based orthodontic luting material (Heliosit Orthodontic, N=10 per group): (A) 35% phosphoric acid (30s), rinse and dry; (B) as in A but additional placement of a prototype adhesive patch (Ivoclar Vivadent) using a bonding agent (Heliobond); (C) application of a two-step self-etch adhesive (AdheSE); (D) as in C but additional patch placement. Samples were stored at 37 degrees C for 24h. SBS was measured with a universal testing machine with a crosshead speed of 0.5mm/min and the adhesive remnant index (ARI) was determined under a stereomicroscope (16x).


RESULTS
Mean SBS (standard deviation) values were as follows: (A) 16.6 (6.4)MPa; (B) 12.2 (5.8); (C) 12.9 (5.0); and (D) 10.5 (4.7). Analysis of variance followed by Bonferroni correction revealed no statistically significant differences. In 2 (B) and 4 (D) specimens, complete retention of the adhesive patch was observed.


CONCLUSIONS
All treatment groups showed adequate bond strength values. The adhesive patch could therefore be applied in combination with orthodontic brackets and seal the enamel adjacent to the bracket.
Schmidlin
Patrick R
PR
Clinic of Preventive Dentistry, Periodontology and Cariology, University of Zurich, Center of Dental Medicine, Plattenstrasse 11, 8032 Zürich, Switzerland. patrick.schmidlin@zzmk.uzh.ch <patrick.schmidlin@zzmk.uzh.ch>
Schätzle
M
M
Fischer
J
J
Attin
T
T
D000134:Acid Etching, Dental; D000179:Acrylates / Q000737:chemistry; D000180:Acrylic Resins / Q000737:chemistry; D000818:Animals; D002327:Cariostatic Agents / Q000008:administration & dosage / Q000627:therapeutic use*; D002417:Cattle; D003722:Dental Alloys / Q000737:chemistry; D001840:Dental Bonding; D003731:Dental Caries / Q000517:prevention & control*; D003743:Dental Enamel / Q000187:drug effects / Q000648:ultrastructure; D008422:Materials Testing; D016910:Orthodontic Brackets; D010756:Phosphoric Acids / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry; D033081:Shear Strength; D013193:Stainless Steel / Q000737:chemistry; D013314:Stress, Mechanical; D013499:Surface Properties; D013696:Temperature; D013997:Time Factors
D000179:Acrylates; D000180:Acrylic Resins; C489662:AdheSE cement; D002327:Cariostatic Agents; D003722:Dental Alloys; C092621:Ivoclar Universal Cement; D010756:Phosphoric Acids; D019279:Resin Cements; D013193:Stainless Steel; C047484:heliosit; C040415:heliobond; C030242:phosphoric acid