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Register a new userEffect of Preparation Technique on Apical Extrusion of Intracanal Debris
أثر تقنية التحضير على دفع البقايا القنوية خارج الذروة
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أحمد عساف( باحث )
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أثناء تحضير الأقنية الجذرية قد تندفع بقايا التحضير القنوية خارج الذروة و قد تسبب آلاما رباطية تالية للمعالجة. تهدف هذه الدراسة المخبرية لتحري تأثير تقنية التحضير المستخدمة على كمية البقايا القنوية المدفوعة خارج الذروة.
during root canal preparation, intracanal debris could extrude apically. The purpose of this in vitro study was to detect the effect of preparation technique on the amount of apically extruded debris.
References used
Williamson, A.E., A.J. Sandor, and B.C. Justman, A comparison of three nickel titanium rotary systems, EndoSequence, ProTaper universal, and profile GT, for canal-cleaning ability. Journal of endodontics, 2009. .35(1): p. 107-109
Naidorf, Flare-ups in endodontics: I. Etiological .Seltzer, S. and I.J .factors. Journal of Endodontics, 1985. 11(11): p. 472-478
Bergmans, L., et al., A methodology for quantitative evaluation of root canal instrumentation using microcomputed tomography. International .Endodontic Journal, 2001. 34(5): p. 390-398
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Aim:
The aim of this study was to compare the weight of debris and irrigant that extruded
apically during the preparation of root canal system using standardized technique, hand
ProTaper, and rotary universal ProTaper.
Materials and Methods:
The
sample was consisted of 30 single rooted teeth, with single canal and apical
foramen, the working length was standardized and the access cavity prepared, each tooth
was fixed with ruper stopper in glass vial contains agar 1.5% to simulate the periapical
tissue. And the vial was fixed in a bigger vial to eliminate any unneccesry contact with the
apparatus. The first vial was weighted before and after preparation.
The sample was randomly divided into three groups, group A Standardized
technique, B Hand ProTaper PTH , C Universal ProTaper PTU.
Result:
The three techniques caused apically extruded debris and irrigants, with statically
significance between Standarized technique and Hand ProTaper(P= 0.024) while the first
caused more debris and irrigants extrusion, also Universal ProTaper caused more extrusion
than Hand ProTaper with statically significance (p= 0.050), but there was no significant
differences between Standarized technique and Universal ProTaper P>0.05.
Conclusion:
Under the condition of this study, it can be concluded that both hand and rotary
preparation technique will cause apical extrusion of debris and irrigants. And PTH was the
least causing of apically extrusion.
One of the skills that should be possessed by block players in volleyball is reaction
speed. It effectively influences the player’s ability to block strong shots from the opponent
correctly. However, response time is influenced by how much the play
er benefits from the
prime which is provided around him to prepare for the next movement. When a player
effectively prepares for the required movement in advance, these information are processed
more rapidly, and thus, we notice an improvement in the player’s reaction time.
Thus, we have conducted this study to find out the effect of special exercises
designed for motor preparation on reaction speed for block players center (3) in volleyball .
For the current study, we have used the priming test, suggested by Rosenbaum and
Kormblum (1982) as a prior test and a follow-up test for both test group and blocked
group, in order to figure out the effect of providing primes on the player’s reaction time.
The primes provided were either identity for the required movementor neutral. We have
followed the method of calculating the number of correct attempts executed by the players,
in order to infer the change in their reaction speed.
The results revealed improvement in the number of correct attempts for test group
after applying the suggested training program in the two situations (identity-neutral).
Therefore, we find that the applied program has contributed to an increase in the number of
correct executed attempts, which suggests an increase in the speed of processing the
information, leading to enhancing the reaction speed in block players center (3). In light of
these findings, we have recommended the necessity of using the suggested training
program as part of the training plans provided for Syrian volleyball teams. This
recommendation is due to the program’s importance in improving reaction speed, on which
most offensive and defensive skills in this game depends. We have also recommended the
necessity of conducting further research and study, based on modern training methods.
Samples were prepared in different ways of Al2O3 / CdO and with one specific mole
Al / Cd: 1-0.25 mol, in the wet joint deposition method. - The thermal disintegration
of aluminum nitrate Al(NO3)3.9H2O and Cd(NO3)2.4H2O nitrate, and the reaction of
aluminum nitrate Al(NO3)3.9H2O and cadmium nitrate Cd(NO3)2.4H2O, with
NH4HCO3 with appropriate reactivity ratios, Sodium laureth sulfate (ALS), and the
effect of various methods of preparation on the properties of the textile structure of
the common oxide group Al O /CdO
2 3
.
It was found that the values of porous structure factors vary according to the
method of preparation, the two samples prepared in the manner of thermal
disintegration. The total pore size is slightly increased, while the mean pore radius
decreases from 2.71nm to 2.37nm, in contrast to the two hydrothermal heating
samples.
The total pore size increases significantly to 0.553ml /g. (SLS), a decrease in the
radius of the middle pores, and an increase in the value of the surface area.
The specimen consists of 72 extracted teeth with curved roots
(15-35)degree . They were cleaned and preserved in formalin
for 48 hours. Each tooth was mounted in a self curing acrylic
block. The samples were divided into three groups. Each
group
(24 canals) was instrumented with one of the systems
(WaveOne, Reciproc, OneShape).
Vitamin C concentration was studied in samples of infant formula from 5 companies
(referenced A-E) using the 2,6-Dichlorophenolindophenol titration (AOAC, 2006) method.
Results revealed that ascorbic acid content in formulas D and C was the closest
to its
recommended daily intake (RDI) and to the concentrations which are mentioned on the
label of the samples. Storage conditions at room temperature or in the refrigerator did not
affect ascorbic acid levels. In comparison to vitamin C concentrations in milk dissolved in
tap water, its levels decreased when water was warm (40°C) or hot (100°C), and its
concentrations further declined in dissolved form kept for two hours after preparation.
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