Comparative Evaluation of the Etching Pattern of Er,Cr:YSGG & Acid Etching on Extracted Human Teeth-An ESEM Analysis
Introduction: Etching of enamel and dentin surfaces increases the surface area of the substrate for better bonding of the tooth colored restorative materials. Acid etching is the most commonly used method. Recently, hard tissue lasers have been used for this purpose. Aim: The aim of the present...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
JCDR Research and Publications Private Limited
2016-05-01
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| Series: | Journal of Clinical and Diagnostic Research |
| Subjects: | |
| Online Access: | https://jcdr.net/articles/PDF/7705/19739_CE(EK)_F(AK)_PF1(AGAK)_PFA(GH)_PF2(AGGH).pdf |
| Summary: | Introduction: Etching of enamel and dentin surfaces increases
the surface area of the substrate for better bonding of the
tooth colored restorative materials. Acid etching is the most
commonly used method. Recently, hard tissue lasers have been
used for this purpose.
Aim: The aim of the present study was to evaluate and compare
the etching pattern of Er,Cr:YSGG and conventional etching on
extracted human enamel and dentin specimens.
Materials and Methods: Total 40 extracted non-diseased teeth
were selected, 20 anterior and 20 posterior teeth each for enamel
and dentin specimens respectively. The sectioned samples were
polished by 400 grit Silicon Carbide (SiC) paper to a thickness of
1.0 ± 0.5 mm. The enamel and dentin specimens were grouped
as: GrE1 & GrD1 as control specimens, GrE2 & GrD2 were
acid etched and GrE3 & GrD3 were lased. Acid etching was
done using Conditioner 36 (37 % phosphoric acid) according
to manufacturer instructions. Laser etching was done using
Er,Cr:YSGG (Erbium, Chromium : Ytrium Scandium Gallium
Garnet) at power settings of 3W, air 70% and water 20%.
After surface treatment with assigned agents the specimens
were analyzed under ESEM (Environmental Scanning Electron
Microscope) at X1000 and X5000 magnification.
Results: Chi Square and Student “t” statistical analysis was used
to compare smear layer removal and etching patterns between
GrE2-GrE3. GrD2 and GrD3 were compared for smear layer
removal and diameter of dentinal tubule opening using the same
statistical analysis. Chi-square test for removal of smear layer in
any of the treated surfaces i.e., GrE2-E3 and GrD2-D3 did not
differ significantly (p>0.05). While GrE2 showed predominantly
type I etching pattern (Chi-square=2.78, 0.05<p>0.10) and
GrE3 showed type III etching (Chi-square=4.50, p<0.05). The
tubule diameters were measured using GSA (Gesellschaft fur
Softwareentwicklung und Analytik, Germany) image analyzer
and the‘t’ value of student ‘t’ test was 18.10 which was a highly
significant result (p<.001). GrD2 had a mean dentinal tubule
diameter of 2.78µm and GrD3 of 1.09µm.
Conclusion: The present study revealed type I etching pattern
after acid etching, while type III etching pattern in enamel after
laser etching. The lased dentin showed preferential removal of
intertubular dentin while acid etching had more effect on the
peritubular dentin. No significant differences was observed
in removal of smear layer between the acid etched and lased
groups. Although diameter of the exposed dentinal tubules was
lesser after lased treatment in comparison to acid etching, further
long term in vivo studies are needed with different parameters
to establish the usage of Er,Cr:YSGG as a sole etching agent. |
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| ISSN: | 2249-782X 0973-709X |