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Dental Treatment 2018 Dentistry and Craniofacial Research
ISSN: 2576-392X Page 43
September 10-11, 2018
Zurich, Switzerland
25th International Conference on
Dental Treatment
T his in-vitro study investigated effect of different gamma
radiation doses on the mechanical properties of esthetic
restorations. A total of 84 standardized specimens were prepared
for this study. Each 21 of them were prepared using the following
four resin composites: Ceram X (Dentsply), Z350 xt (3M ESPE),
Xtra fill (Voco) and Grandio (Voco). Then, the 21 specimens were
divided as follows: 3 specimens representing the control group
(C) were cured usingwood pecker LED light cure unit, 9 specimens
were subjected to gamma radiation after curing (IaC) from which
three were subjected with a dose of 10 Gy (IaC-10), the other three
with 30Gy (IaC-30) and the last three with 60 Gy (IaC-60); the last
9 specimens were subjected to gamma radiation before curing
(IbC) from which three were subjected with a dose of 10 Gy (IbC-
10), the other three with 30 Gy (IbC-30) and the last three with
60 Gy (IbC-60). All specimens were subjected to measurement of
surface microhardness in Vickers hardness tester. The depth of
cure was calculated by obtaining the microhardness ratio through
dividing Vickers hardness number (VHN) of the bottom surface
by VHN of the top surface. Data was then recorded, tabulated and
statistically analyzed. Most results of the specimens’ top showed
statistically significant increase in mean microhardness of IaC
and IbC sub-groups in relevance to the control groups. Most
results of the specimens’ top showed statistically significant
increase in mean microhardness of IbC sub-group in relevance to
IaC sub-group. Results of (B/T) showed increase in mean depth
of cure of IbC sub-groups in relevance to the control group and to
IaC sub-groups, where most of them are statistically significant.
Pearson correlation coefficient between top and bottom was
found to be statistically significant (r=0.9). In conclusion, surface
micro hardness of different composite resin have improved
following being subjected to gamma radiation by various doses,
on the other hand most of the results of the depth of cure was low
for the group IaC and has improved for the group IbC.
Biography
Dr Ahmed is holding doctorate degree from Cairo University, Egypt. He is
now holding the position of Assistant professor in the Restorative Dentistry
department at the Egyptian Russian University in Egypt.
Dr Rana is now a student in the final year at faculty of dentistry, Egyptian
Russian University, Egypt.
Effect of different gamma radiation doses on the
mechanical properties of esthetic restorations
Ahmed Adel A Aziz1 and Rana Ahmed Tawfiq2
1October 6 University, Egypt
2Egyptian Russian University, Egypt
Ahmed Adel A Aziz et al., J Dent Craniofac Res 2018, Volume 3
DOI: 10.21767/2576-392X-C3-008