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Document Type |
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Article In Journal |
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Document Title |
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EVALUATION OF BOND STRENGTH AND SCANNING ELECTRON MICROSCOPIC (SEM) EXAMINATION OF THE INTERFACE BETWEEN DENTIN ADHESIVE SYSTEMS, GLASS IONOMER CEMENT AND SCLEROTIC DENTIN EVALUATION OF BOND STRENGTH AND SCANNING ELECTRON MICROSCOPIC (SEM) EXAMINATION OF THE INTERFACE BETWEEN DENTIN ADHESIVE SYSTEMS, GLASS IONOMER CEMENT AND SCLEROTIC DENTIN |
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Document Language |
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English |
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Abstract |
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The purpose of this study was to evaluate bond strength of two adhesive
systems to sclerotic and normal dentin, as compared to glass ionomer
cement restoration material. The microstructure of [he interface between
glass ionomer cement, the adhesive systems / dentin was examined using
scanning electron microscope Two dentin bonding systems were used in this
study Scotchbond Multi-Purpose (fourth generation ) and Syntac (third
generation with their composite Wresin ( Z10 and Helimolar). Glass
ionomer cement restorative material (GIC) was also used. Twenty-one
caries-free freshly extracted human premolars were collected and stored in
distilled water. Another twenty-one caries-free human premolars showing
severe occlusal attrition, were collected from patients over 60 years . The
teeth were selected according to the criteria of dentin sclerosis scale
described by Heyrnan and Bayne in 1993 (Table II)
The occlusal surfaces of the teeth were ground flat on a water-cooled
abrasive wheel to expose dentin for preparation of The specimens for shear
bond strength test The 42 teeth were divided into two main groups ; Group
(I) normal dentin (21 teeth) and Group (II) sclerotic dentin (21 teeth ). Each
group was further subdivided into thee subgroups ( a, b and c ) Group ‘a and
Ha ( Scotchbond Multi-Purpose with Z100 ) , Group 1b and tb (Syntac and
Helimoler ) , Group l and B (Glass ionomer cement- Fuji II ) • The shear
bond strength was determined in a Universal Testing Machine with cross
head speed of 1 cm/minute The fractured specimens were Cut longitudinally
and examined using scanning electron microscope (SEM)From the obtained results, the following could be concluded:
1) It is increasingly important that clinicians should recognize
differences in dentin composition before planning restorations that
depend on the use of dentin bonding systems. By SEM examination ,
the clinical criteria of sclerosis (glassy appearance of dentin) was
confirmed and the dentinal tubules were partly or completely
obliterated by mineral crystals providing a uniform refractive index of
the dentinal tubules
3) Dentin sclerosis significantly affected the bond strength of the two
dentin bonding systems used in this study. However, dentin adhesive
system that recommended a total etch pre-treatment of dentin, i.e. uses an
enchant and a primer offers more reliable bonding to both normal and
sclerotic dentin. This was clearly observed in SEM, where the
Scotchbond MP shows more resin tags development with both normal
and sclerotic dentin
4) Although glass ionomer cement showed higher bond strength to
sclerotic dentin, these bond strength values were significantly lower than
those of adhesive bonding systems.
5) Further researches are needed to develop adhesive systems that bond
equally well to various kinds of dentin substrate Also, extending the
application time of the etchent of existing dentin adhesive systems or the
use of more aggressive acids may be of benefit. |
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ISSN |
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0 |
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Journal Name |
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Alexandria Dental Journal |
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Volume |
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20 |
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Issue Number |
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1 |
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Publishing Year |
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1995 AH
1995 AD |
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Article Type |
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Article |
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Added Date |
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Wednesday, January 2, 2008 |
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Researchers
| 'hvr رشاد | Rashad, Tarek | Researcher | Doctorate | tabdulrahim@kau.edu.sa |
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