Background: socket preservation is a main therapeutic procedure to prevent severe
marginal bone resorption after tooth extraction. The aim of this study is to investigate if
there is any difference in the amount of new bone formation 4 months after
extraction and
ridge preservation compared to that after 6 months, Using tricalcium phosphate as a bone
substitute.
Methods: Minimally traumatic extraction with socket preservation using tricalcium
phosphate was done at 30 single-rooted tooth sites in 28 patients. 15 sites healed for an
average of 18 weeks (early healing group), and 17 sites were allowed to heal for an
average of 27 weeks (delayed healing group) before collecting the bone samples .
histological analysis was held to detect the percentage of new bone formation, residual
substitute particles, and connective tissue/non-mineralized structures for each site.
Results: All samples revealed a new bone formation, most of the residual substitute
particles were surrounded by woven bone. No statistically significant differences in the
amount of newly formed bone or residual substitute particles were found between the two
groups. Overall, the early healing group demonstrated a mean of34.8% newbone,
20.5%residual substitute material, and 44.7% non-mineralized tissue. The delayed healing
group showed mean values of 36%, 18.5%, and 45.5%, respectively.
Conclusion: This study suppose that waiting for 6 months after tooth extraction and
socket preservation using tricalcium phosphate does not provide a greater amount of new
bone formation or less residual bone particles compared to that after 4 months.
تزداد يوماً بعد يوم أهمية استخدام الأملاح الفوسفاتية كمضافات علفية ومن هذه الأملاح فوسفات أحادية الكالسيوم
The changes in coefficient of distribution of lead and cupper has been studied in
system with two phases, liquid water contaminated with lead and copper-solid (natural
Phosphate of Syria) correlation of the following factors: Time of mixing phases,
size of the
developed steel ,change the values of PH ,concentration of elemental lead and
concentration of element capper ,the concentration of calcium as a competitor to the
occupation of sites available on the solid phase, the ratio V\m presents the water phase size
on the mass of phase ,the Percentage removal of lead from aqueous samples prepared in
the laboratory91,57-99,95% were the best conditions for a vast proportion removed can be
summarized as follows:
PH=[6,63-10,11], Time of mixing phases =60 minutes and V/m=1000.
The Percentage removal of copper from aqueous samples prepared in the
laboratory 95,27 -99,96 % were the best conditions for a vast proportion removed can be
summarized as follows:
PH= [7,89-11,01] , Time of mixing phases =60 minutes and V/m=1000.
Ideal conditions have been applied that were obtained according to laboratory tests
on water samples from industrial input to Banias refinery and water samples from
industrial drainage to Syrian company for oil transport after Removal for lead was(
100%,99 %). Removal for copper was( 100%,98 %) .
Phosphoric acid is one of the most important products in
chemical industry, where it is used in different industries,
such as food and fertilizer industries and so on .
This study focuses on the preparation of phosphoric acid
from Syrian phosphate in the laboratory by using the
hemihydrate method , and determines the best optimal
conditions for preparing this acid using this method .
According to the chemical pollution danger in general and its danger on groundwater
wells in agricultural areas particularly the inhabited ones , the scientific study was
implemented to determine the concentrations of some ions in water wells withi
n the area of
Hraesoon; In addition to, monitoring their changing values which indicate the rate of
chemical pollution in the study area due to existing activities.
The search involves a monthly periodic physical and chemical analyzes in the
invested wells in Hraesoon area , Banias city for a whole year. starting from September
2011 till August 2012 by choosing ten invested wells disterbuted in the area.
The study includes the changing of temperature ,pH, electrical conductivity, and the
group of negative ions (nitrate NO3
-, phosphate PO4
3-, sulphates SO4
2-, chloride Cl-) in
addition to positive ions (ammonium NH4 +, Sodium Na +).
The values of the studied ions have demonstrated a clear disparity in each month for
the samples taken from the same wells, due to the agricultural ,human activities and
climatic conditions that prevailed during the sampling dates.
The recorded results show cases of chemical contamination in the water wells
studied not identical the Syrian standard for drinking water (2011-2012) portend a lot of
health and environmental risks, especially that many of those wells are used for drinking
purposes.
The paradox of the search reveals the growing need of phosphate
derivatives, and to develop its usage in Agriculture and other consumer
goods. However, the manufacturing of the raw phosphate products is still
under the requested demand which requi
res importing to reimburse the
shortage in spite of the fact that the raw materials are exported in a very
low additional cost.
The search aims to identifying the geographic distribution of Phosphate
in Syria and the possibility of investing it, identifying its characteristics
and its economic value, coefficient of correlation between production and
consumption, and observing the future horizons of a rational investment
in it.
The Al-Hassa oasis at the Kingdom of Saudi Arabia is an agricultural area
depends on irrigation associated with a drainage network with three main
drainage canals. Two of them, the D١ and the D٢, cover most of the oasis total
area (٢٠،٠٠٠ ha) whil
e the third one (the D٣) covers a limited area. This study
aimed to examine the spatial variability in the concentrations of NO٣
- and PO٤٣- in the drainage water of the D١ and the D٢ canals.
