Research
Contribution
of Different Materials to the Leakage of Restorations
J. Stannard,
I. Stannard and S. Stannard
IADR - San Diego, California USA
(2011)
Current restorative materials include compositional differences:
filled-non-filled, solvent-nonsolvent,
and composite or glass ionomers.
With many choices, little attention has been provided
to combinations
of materials and their contribution to leakage. Objective: To evaluate
4
combinations and present a new method. Methods: Sixty, non-carious
molars were embedded in
acrylic blocks. Occlusal and root portions
were removed to create parallel, thicknesses of 3.5 mm.
Selection criteria:
uniform dentin, i.e. no root or pulp chamber. A 1.84 mm prep. was
created
through the tooth axially. 28 teeth were divided into four
groups (n=7). Group A Clearfil (Kuraray)
and filled with UDMA composite
(Denali Corporation). Group B Aura Veneer Cement (Denali
Corporation)
without bonding agent. Group C Fuji Plus with bonding agent (GC
Corporation),
and Group D OptiBond Solo (Kerr) bonding agent with
UDMA composite (Denali Corporation).
Each surface was polished (600
grit) and examined at 40X. 1% methylene blue was placed over
the top
treatment area. Leakage values were scored: 1- no dye at tooth/restorative
material
interface (T/RM), 2- minor dye at T/RM (<30%), 3- extensive
dye (30-60%) at T/RM, 4- massive
dye (60-100%) at T/RM . Leakage was
analyzed using Mann-Whitney-Wilcoxon Test (MWW)
alpha = 0.05. Results:
All teeth in Group A showed massive leakage. Group B, 4/7 no leakage,
and
3/7 minor leakage. Group C, 4/7 teeth extensive leakage and 3/7
teeth no leakage. Group D, 6/7
teeth massive leakage and 1 tooth extensive
leakage. Quantitative and qualitative differences
were observed. MWW
indicated: Group A and D showed the greatest leakage, and statistically
equivalent.
Group C was statistically better than A and D, Group B showed the
least leakage, and
statistically better than any Group. Conclusions:
Use of a self-etching bonding agent compared
to a self adhesive material
can significantly increase leakage of a restoration.
