The research aims to evaluate the micro shear bond strength of the calcium silicate cement
(Biodentine) and the glass ionomer cement (GIC) to dentine. The study was performed using
upper or lower premolars, and samples were divided into six equal s
ubgroups according to
the time period (3 h, 1 day, 1 week, 2 weeks, 4 weeks, 8 weeks), in order to study changes in
the values of shear bond strength with time. The comparative study showed that the success
rate of adhesion in the Biodentine group was smaller than that in the GIC group for the tested
premolars after 3 hours and one day, whereas the success rate in the Biodentine group was
greater than that in the GIC group for the tested premolars after 8 weeks.
Results showed a positive correlation between the mean values of shear bond strengths and
the studied time in Biodentine group, which ranged from 1.49 ± 0.18 MPa at 3 hours to a
maximum value of 2.65 ± 0.26 MPa after 8 weeks. While there was a negative correlation
between the mean values and the studied time in the GIC group and values ranged from 3.02
± 0.13 MPa at 3 hours and 2.06 ± 0.09 MPa at 8 weeks.
The study showed the advantage of Biodentine compared with GIC in terms of
micro-bonding to dentine, which can have a clinically significant importance in preventing
the micro leakage and reducing bacterial contamination.
Residual Calcium Hydroxide dressing on the root canal is considered
one of the reasons of endodontic treatment failure. So ,the removal of
this dressing completely before filling is required. The aim of the study
was to evaluate the efficiencies o
f passive ultrasonic irrigation And
increasing the instrumentation of the medicated canal to the file one
size larger than MAF in removal of Calcium Hydroxide dressing.
The study was conducted on winter date (15th of Febraury), during 2015 and
2016 seasons, to study the effect of spraying calcium chloride CaCl2
concentrations (2, 4, and 6%), on the manufacture traits assigned in randomized
completely block design (RCBD) with four replicates.
The objective of the present study was to investigate, in a sub-sinus
bone augmentation model in rabbits, effect of Three Calcium Phosphate
beta at different stages of the osteogenesis process. Histological and
statistical analyses were performed.
Rabbits underwent sinus augmentation procedures using Three Calcium
Phosphate beta (Cerasorb) and Collagen membrane ( Gen Derm ) .
In this research study Toisat phase in bilateral Wholesale (NaVO3-CaMoO4) in vitro
(in the laboratories of the Faculty of Science), where is the concept of phase transitions, the
basis for many of the natural sciences chemistry , physics and biolog
y, which is the
premise of science engineering, mechanical and electrical such as engineering and
materials engineering. Transitions are considered the metaphase common in nature, it has
benefited rights in the development and improvement of old materials, which was able to
elaborate the phase transitions unfamiliar (Fluid high, conductivity high, glass metals) and
in which they can solve many of the technical problems that were facing the technology,
and this is still the door open as long as the will to improve life on the basis of scientific
progress exist.
??When examining any material changes within the stages, studying the so-called
scheme of balance or eccentric scheme, since the material balance energy Minimal when
changing variables Altermdinamekih. Practically impossible to reach a state of
equilibrium, lies the importance of research to obtain crystalline compounds in the binary
strings of dead sodium vanadate with calcium molybdate what these salts from the
properties of the quality in the areas of technology, so it was important to study the
possibility of obtaining new phases at different Molar ratios and fee balances schemes her
eccentric. Especially since the salts derived for the study have different crystalline
structures and can therefore predict that the outputs of the study will be important and
good.
This study shows form the core of a solution on the basis of calcium molybdate
where dissolved sodium molybdateMataffanadat in calcium up to 40% of sodium
Mataffanadat.
Aim: The aim of this study was to detect the effect of dressing period of calcium
hydroxide medicament on the apical marginal leakage after obturation of root canal
system.
Materials and Methods: 80 freshly extracted single rooted human teeth were
selected ,all the root canals were hand-instrumented. They were randomly divided into four
groups of 20 teeth each. Group A has no intracanal medicament , groups (B,C,D) were
dressed with Ca(OH)2 paste for a different periods of time (7,14,30) days respectively,
groups (B,C,D) were divided into subgroups of 10 teeth according to removing of dressing
. The removal of ca(OH)2was done by two ways, 1- By irrigating with distilled water and
drying with paper points . 2- Size 40 k-file was used in slightly filing motion up to the
working length then irrigated with distilled water and drying with paper points. After that
all groups were obturated with lateral compaction technique using gutta-percha points and
zinc oxide-eugenol cement. Then the access was sealed with GIC cement. The teeth were
immersed into 2% mythylene blue solution ,The specimens were placed in an incubator at
37 C ,with moisture at 100%, for 7 days .After that the roots were sectioned
longitudinally and examined with stereomicroscope and liner leakage was measured.
Ceramic samples of calcium doped barium titanate have been prepared from highpurity
raw materials by using solid-state reaction method at a sintering temperature of
1350˚C for 3.5h. The electrical properties of ceramic samples Ba1-xCaxTiO3 have bee
n
studied for the ratios (x = 0, 0.1, 0.3, 0.5, 0.7, 1), as a function of temperature within the
range of 25˚C to 220˚C at the frequency 1kHz. Experimental results show that the Currie
point moved within the temperature range from 120˚C to 150˚C by change of calciumadded
ratios. Dielectric constant decreases by increasing the calcium-added ratios. The
maximum value of the dielectric constant rached to έ=6898.85 for barium titanate at the
temperature Tc = 132˚C. We got the high values of the tangent loss angle at both ends of
the studied temperature range. Curie constant decrease of the samples by increasing the
additional calcium ratios.
Aim of Study: The antimicrobial intracanal medication was used widely, and the most common was calcium hydroxide dressing, which must be removed from the root canal before obturation, hence this study aimed to comparative efficacy of EndoVac and Navi
Tip 30 G irrigation Needles with Naocl and CHX 2% in removing calcium hydroxide dressing from the apical third of root canal. Materials &Methods: Forty single root and canal teeth were decoronated to the length of 16 mm. Each root was prepared to the apical foramen using ProTaper Universal Hand System to size 40. Each tooth was embedded in silicone putty to create a set matrix, which allowed reassembly of the tooth for irrigation tests after splitting longitudinally. Then each tooth was split into two halves and an artificial groove (L:4, W:0,2 , D:0,5 ) was cut in one half of the root canal wall 1 mm from the apex ,which was then filled with a Ca(OH)2 paste. Digital images were taken before reassembling under stereomicroscope X40. Subsequently the two halves of roots were reassemble with wax , and remounted in their silicone matrixes, then divided into 2 groups.
This study aims to assess the effectiveness of using calcium phosphate bone
cement in increasing the primary stability of orthodontic miniscrews by testing
its resistance to pullout forces.
This research aims to study the deformations creep in clayey soils
treatment with calcium chloride.
Creep experiments were carried out on samples of soil was added
with different ratios of calcium chloride compound, was measured
deformations with time and monitor the impact of the proportion of
calcium chloride added to the soil to these deformations.
