Effect of silane contamination on dentin bond strength.
BACKGROUND
Intraoral repair of porcelain or other silica-based ceramics typically requires the use of silane in the repair protocol. Some porcelain intraoral repairs also involve bonding to exposed or involved tooth tissues including dentin. A study is needed to evaluate whether the cross-contamination of dentin with silane affects bond strength to this tissue.


OBJECTIVE
The purpose of this in vitro study was to investigate the effect of silane cross-contamination on dentin bond strength.


METHODS
Flat surfaces of human dentin specimens were created, followed by wet polishing with 320-grit silicon carbide paper. The dentin specimens were divided into 4 groups: group SE (All-Bond Universal Adhesive used in self-etching mode); group SiSE (silane applied to dentin followed by All-Bond Universal Adhesive used in self-etching mode); group ER (All-Bond Universal Adhesive used in total-etch (etch-and-rinse) mode); and group ERSi (Etch and rinse and silane applied to dentin followed by All-Bond Universal Adhesive). The dentin specimens were treated with a universal adhesive (All-Bond Universal) and bonded with a composite resin, using an Ultradent jig mold. Shear bond strength (n=10) was measured after 24 hours of water storage at 37°C. After the shear bond strength test, the dentin sides of fractured specimens in each group were examined with a stereomicroscope at ×15 magnification to determine failure modes. Data were statistically analyzed by 2-way and a 1-way ANOVA followed by post hoc Tukey honest significant difference test (α=.05). Scanning electron microscopy examination was used to evaluate the dentin surface morphology before and after bonding.


RESULTS
The shear bond strength of composite resin to dentin was not affected adversely when the dentin was contaminated with silane prior to using All-Bond Universal in the self-etch or total- etch (phosphoric acid) mode. SE, 30.3 ±3.8 MPa; SiSE, 32.9 ±3.9 MPa; ER, 34.9 ±3.1 MPa; ERSi: 35.2 ±4.9 MPa (P>.05) CONCLUSIONS: Under the conditions of this study, cross-contamination of dentin with silane before the use of All-Bond Universal in the self-etch or total-etch with phosphoric acid mode did not adversely affect composite resin bond strength to dentin.
Chief Scientist, Department of Research and Development, Bisco Inc, Schaumburg, Ill. Electronic address: lchenchem@yahoo.com.
Liang
L
Chen
Associate Professor, Dental Continuing Education, The Dental College of Georgia at Augusta University, Augusta, Ga.
Barry D
BD
Hammond
Private practice, Huntington, N.Y.
Gary
G
Alex
President, Bisco Inc, Schaumburg, Ill.
Byoung In
BI
Suh
D000134:Acid Etching, Dental / Q000379:methods; D002516:Ceramics / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry; D001840:Dental Bonding / Q000379:methods*; D003776:Dental Porcelain / Q000737:chemistry; D003799:Dental Stress Analysis; D003804:Dentin / Q000187:drug effects* / Q000648:ultrastructure; D017220:Dentin-Bonding Agents / Q000737:chemistry / Q000494:pharmacology*; D006801:Humans; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D010756:Phosphoric Acids; D019279:Resin Cements / Q000737:chemistry; D033081:Shear Strength; D012821:Silanes / Q000494:pharmacology*; D013499:Surface Properties; D015040:Zirconium / Q000737:chemistry
D003188:Composite Resins; D017220:Dentin-Bonding Agents; D010756:Phosphoric Acids; D019279:Resin Cements; D012821:Silanes; D003776:Dental Porcelain; D015040:Zirconium; C030242:phosphoric acid; C028541:zirconium oxide