Background: The objective of this study was to determine whether the addition of microsilver or nanosilver\nparticles to an orthodontic primer affects shear bond strength (SBS) and bracket/adhesive failure.\nMethods: Bovine incisors were randomly divided into six groups with 16 specimens in each: In group 1 (control),\nbrackets were bonded with Transbondââ??¢ XT primer. In the experimental groups, microsilver (groups 2 and 3) and\nnanosilver (groups 4ââ?¬â??6) particles of different sizes were added to Transbond XT primer and light cured for\n15 seconds [group 2: 0.1% (w/w) microsilver particle size 3.5ââ?¬â??18 ?m; group 3: 0.3% (w/w) microsilver particle size\n3.5ââ?¬â??18 ?m; group 4: 0.11% (w/w) nanosilver particle size 12.6ââ?¬â??18.5 nm; group 5: 0.18% (w/w) nanosilver particle size\n12.6ââ?¬â??18.5 nm; group 6: 0.33% (w/w) nanosilver particle size 12.6ââ?¬â??18.5 nm]. Thereafter, brackets were bonded by\nlight curing the adhesive for 20 seconds. After 24 hours of storage in distilled water at 37Ã?°C, SBS was measured\nwith a Zwicki 1120 testing machine. The adhesive remnant index and the prevalence of silver spots on the\nspecimen surface were determined under 10Ã?â?? magnification. Statistical two-way analysis of variance was performed\nto compare SBS, and a chi-square test was used to compare ARI scores and the prevalence of silver spots.\nResults: No significant differences in SBS (control: 16.59 Ã?± 6.82 MPa; group 2: 20.6 Ã?± 4.19 MPa; group 3: 16.98 Ã?± 4.84 MPa;\ngroup 4: 17.15 Ã?± 5.92 MPa; group 5: 20.09 Ã?± 3.35 MPa; group 6: 16.44 Ã?± 4.51 MPa; p > 0.665) and ARI scores (p = 0.901)\nwere found between the control group and any experimental group. Only experimental groups with nanosilver\nparticles revealed statistically more silver spots on the remaining adhesive.\nConclusions: Addition of small concentrations of microsilver or nanosilver particles affects neither SBS nor ARI scores.\nAddition of nanosilver particles results in silver spots in the remaining primer visible under 10Ã?â?? magnification. Further\nstudies are needed to investigate the anti-caries potential and clinical performance of conventional orthodontic primer\nwith incorporated nanosilver or microsilver particles.
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