Repairability of dental siloranes in vitro.
OBJECTIVE
Aim of the study was the investigation of the repairability of a silorane (Filtek Silorane, 3M Espe, Seefeld, Germany) after different surface pretreatments in vitro.


METHODS
54 silorane specimens (5 mm × 5 mm × 5 mm) were fabricated and stored in saline solution (24 h/37°C). Their surface was polished with abrasive paper (600 grit), etched with phosphoric acid (10 s) and rinsed with water (30 s). Repair was performed with a silorane based on one of the 9 treatment protocols (each n=6): no additional treatment (NAT), silorane primer (P) and silorane bond (B), B only, sandblasting (SB), SB plus P/B, SB plus B, CoJet and silane (CJ), CJ plus P/B, CJ plus B. Whole silorane specimens (5 mm × 5 mm × 10 mm) with no repair served as control. Specimens were sectioned and microtensile bond strength (μTBS) was measured (30 beams per group, surface area approx. 1.2 mm², crosshead-speed 1 mm/min) statistical analysis (ANOVA, Tukey HSD, p<0.05) was performed.


RESULTS
μTBS of the specimens was significantly influenced by the surface pretreatment (p<0.001). The highest μTBS was determined for CJ/B and SB/B, which were not significantly different from the control. NAT, SB and CJ benefited from an additional treatment with B (p<0.01). The additional use of P did not improve μTBS, but was detrimental for the SB and CJ groups (p<0.05).


CONCLUSIONS
Siloranes can be repaired with either SB or CJ in combination with a silorane bond, the additional use of silorane primer is disadvantageous.
Department of Conservative Dentistry, Periodontology and Preventive Dentistry, Hannover Medical School, Hannover, Germany. Luehrs.Anne-Katrin@mh-hannover.de
Anne-Katrin
AK
Lührs
Barbara
B
Görmann
Silke
S
Jacker-Guhr
Werner
W
Geurtsen
D000134:Acid Etching, Dental; D000537:Aluminum Oxide / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding; D003738:Dental Cements / Q000737:chemistry; D045662:Dental Etching / Q000379:methods; D003764:Dental Materials / Q000737:chemistry*; D003775:Dental Polishing / Q000379:methods; D017269:Dental Prosthesis Repair; D003799:Dental Stress Analysis / Q000295:instrumentation; D006801:Humans; D008422:Materials Testing; D010756:Phosphoric Acids / Q000737:chemistry; D012821:Silanes / Q000737:chemistry; D062047:Silorane Resins; D012833:Siloxanes / Q000737:chemistry*; D012965:Sodium Chloride / Q000737:chemistry; D013314:Stress, Mechanical; D013499:Surface Properties; D013696:Temperature; D013718:Tensile Strength; D013997:Time Factors; D014867:Water / Q000737:chemistry
D003188:Composite Resins; D003738:Dental Cements; D003764:Dental Materials; C076808:Monobond S; D010756:Phosphoric Acids; D012821:Silanes; D062047:Silorane Resins; D012833:Siloxanes; C555513:silorane composite resin; D014867:Water; D012965:Sodium Chloride; C030242:phosphoric acid; D000537:Aluminum Oxide