2 research outputs found
In vitro study of Coronal Leakage of Four Temporary Filling Materials Immersed in Alcoholic Methylene Blue Dye
Abstract
Introduction: Temporary restorative materials
are placed in access cavity to provide the coronal
seal of the root canal during multi-visits RCT. This
in vitro study was designed to evaluate the coronal
microleakage of four different temporary restorative
materials commonly used in endodontics in
Myanmar, viz., MD.Temp, Orafil, Caviton, Zinc oxide
eugenol.
Materials and Methods : Forty-four extracted human
premolars were selected, and access cavity was
prepared. Pulp chambers were filled with wet cotton
pellets leaving approximately 4 mm coronally. Forty
teeth were randomly divided into four experimental
groups equally. The remaining four teeth were equally
divided into two control groups. Access cavities in
each group were filled with one of the above tested
materials, and immediately put into the water. Tooth
surfaces except occlusal surface were then coated
with nail varnish. Equal parts of 2% methylene blue
and methylated alcohol were mixed to prepare a dye
solution. Samples were immersed in dye for 10 days
at 32 ± 2°C. Teeth were rinsed, dried, and sectioned
mesiodistally and evaluated under a stereomicroscope
at a magnification of 15X for linear dye penetration
along cavity walls. Data were analyzed using KruskalWallis and Tukey HSD tests.
Results : The lowest microleakage value
was observed in MD.Temp and Orafil, and the
highest in Zinc oxide eugenol (ZOE). Caviton was
not statistically different from Orafil and ZOE, but
significantly higher in microleakage than MD.Temp.
Clinical Significance : ZOE which is dissolvable in
alcohol was the least effective material for preventing
microleakage, while MD.Temp and Orafil provided
the best sealing in content of alcohol in this study
The Effect of Adhesive Resin Coating on Microleakage of Class II Composite Inlay Cemented with Self-Adhesive Resin Cement
ABSTRACT
Objective: The objective of this in vitro investigation was to evaluate the
effect of adhesive resin coating with a self-etch dentin bonding agent and etch
and rinse dentin bonding agent and without coating on microleakage of class II
indirect composite inlay cemented with self-adhesive resin cement on enamel
and dentin interfaces after thermocycling.
Methods: Thirty-six upper permanent premolars extracted for orthodontic
needs were selected for this study and randomly allocated to three
experimental groups (n=12). These samples of teeth were prepared in a
standardized manner under jig assembled on a milling machine. After
preparation, group I: no surface treated with dentin bonding agent; group II:
prepared surface treated with a self-etch dentin bonding agent and group III:
prepared surface treated with etch and rinse dentin bonding agent. And then,
impression taking with rubber base impression materials and indirect
composite inlays were fabricated and cemented with self-adhesive resin
cement.
Restored teeth were artificially aged with a thermocycling machine
(5±2oC and 55±2oC, 1000 cycles with 30 sec dwell time). After
thermocycling, the samples were immersed in 2% methylene blue dye solution
for 24 hours. Then, teeth samples were sectioned mesiodistally with Isomet
linear precision saw. The most linear penetration of the dye was observed
under a stereomicroscope at 40x magnification. All the samples were scored
and statistically analyzed with Kruskal-Wallis nonparametric test (p<0.05)
followed by Mann-Whitney U-test for multiple comparisons.
Results: In group I, no treatment of the prepared surface with dentin
bonding agent immediately after preparation and before impression taking
(Control group), the mean score was 3.17. In group II, prepared surface coated
with self-etch dentin bonding agent immediately after preparation and before
impression taking, the mean score was 2.17. In group III, prepared surface
coated with total-etch dentin bonding agent immediately after preparation and
before impression taking, the mean score was 2.67. According to statistical
analysis, there was a significant difference (p<0.05) between all groups in
microleakage values by using Kruskal-Wallis non-parametric test. And there is
no significant difference between Group I Vs III and Group II Vs III.
Conclusion: 1. Microleakage of class II composite inlay cemented with selfadhesive resin cement significantly decreased by using adhesive resin coating
with a self-etch dentin bonding agent on the prepared surface before
impression taking.
2. There is highly significantly lower leakage at the occlusal
margin versus the dentin margin of all tested groups in inter-group
comparison