The effect of delaying composite resin restoration after silver diamine fluoride pretreatment on the shear bond strength of the final restoration: An in-vitro study

Author(s): Eman H. Aboulsaood BDS, Niveen S. Bakry PhD, Sarah I. Zeitoun PhD, Salma A. Aboulgheit PhD.

Background: The aim of the current study was to investigate the effect of
delaying final restoration for one week after SDF pretreatment on shear
bond strength of composite resin.
Materials and methods: Sixty-six extracted sound primary teeth were
randomly allocated to one of three groups as follows ; Group 1 (Control
group): composite restoration without pretreatment, group 2: 38% SDF
pretreatment + immediate composite restoration, group 3: 38% SDF
pretreatment + 1-week aging + composite restoration. Each group was
further divided into two subgroups according to the bonding protocol used
as follows: (Subgroup ER) etch-and-rinse technique and (Subgroup SE)
self-etch technique. SDF and composite resin were applied to the flattened
buccal dentinal surfaces. SBS was measured using universal testing
machine. Mode of failure was assessed by stereomicroscope. Elemental
contents and depth of penetration were assessed using energy dispersive
x-ray stereoscopy (EDS).
Results: A statistically significant difference in mean SBS was found
between group 2 (39.88 ± 27.35) and group 1 (85.17 ± 40.43), but no
significant difference was found between group 3 (96.70 ± 30.28) and
group 1 (85.17 ± 40.43). Moreover, there was a statistically significant
difference in mean SBS between subgroup 2ER (52.23 ± 30.13) and 2SE
(27.53 ± 18.11). EDS analysis revealed deeper penetration of silver ions
over time.
Conclusions: Delaying composite resin restoration bonding to primary
dentin for one week after SDF pretreatment eliminated any negative
impact on SBS of the final restoration.