in vitro study to evaluate the quality of root canal filling of [MTA] and [PC]

The quality of root canal filling is considered the key of the successful endodontic treatment, because the one of goals of root canal obturation is to obtain three-dimensional and complete sealing. Therefore, The aim of this in vitro study was to evaluate the quality of root canal filling of White-colored Mineral Trioxide Aggregate [WMTA] and Gray-colored Portland Cement [GPC]. The sample of study consisted of seventy five recently extracted, single-rooted, permanent human teeth. The root canals were prepared using Crown-Down technique, then the sample was randomly divided into 5 equal groups of 15 teeth each, according to the root canal filling material used: [Groupl: [WMTA] lonely, Group2: [GPC] lonely, Group3: [Gutta-percha points + WMTA], Group4: [Gutta-percha points + GPC], GroupS: [Gutta-percha points + AH26]]. After root canal filling, the temporary coronal restorative material [Coltosol F] was placed, and the teeth were stored in [100% humidity at 37°C] for 7 days. Then, it were cleared and examined by a stereomicroscope [20X magnification] to evaluate the presence of the filling cement in the apical, middle, and coronal thirds of the root canal. Kruskal-Wallis and Mann-Whitney U tests were used, it showed that [GPC] lonely achieves the best quality of root canal filling in the middle thirds, whereas, it was the worst material in the apical thirds. There were no statistically significant differences among the five groups of used materials in the coronal thirds. In the root canal filling [WMTA] lonely, [Gutta-percha points + WMTA], [Gutta-percha points + GPC], and [Gutta-percha points + AH26] can be used, but [GPC] lonely can not be used

[Clinical comparison between Ga Al As laser and drug therapy on apicectomy pain and swell]

Laser is one of the new biotechniques which may open a new world wide dentistry. Low level laser therapy or soft laser intensity possesses an eminently analgesic and biostimulant effect, by producting endorfin alpha and beta and increasing the local microcirculation. Although apicectomy at 20th century have opened the door for new dentistry by increasing the treatment possibilities and improved the functional and esthetics results for patients. Material and The aim of our research is to evaluate the influence of GaAlAs laser therapy on pain and swelling which occur after apicectomy compared with drug therapy. The sample consisted of 36 Clinic patients and divided in 3 groups: GI-The apicectomy surgically was done without laser application, but with analgesic and anti inflammatory. GII-The apicectomy was done with laser therapy sessions in the postoperative immedite, of 24 hs and of 72 hs, but without analgesic and anti inflammatory. GIII-The apicectomy surgicaly and laser therapy sessions in the preoperative and immedite, of 24 hs and of 72 hs, but without analgesic and anti inflammatory. The laser equipment was of Semi conductor Ga Al As 904 nm and power 1.5 j/cm2. The statistical study of the pain and swelling effect by Giles index of pain and Rosane index of swelling, by sample t [test] with significance degree at level 5%. Showed that soft laser for analgesic and anti swelling if we use it pre and post operated within 24 hs and this result agrees with many studies which confirm the soft laser analgesic and anti inflammatory effect. We can use soft laser as a drug alternative therapy for patients who can not use drugs or can be usefull in big operations