Demiriz L. | Hazar Bodrumlu E. | İçen M. | Durmuşlar M.C.

Article | 2016 | Scanning38 ( 6 ) , pp.579 - 584

Supernumerary teeth may affect the tooth eruption negatively if they occur on the eruption way, and the treatment choice is usually the extraction to prevent the impaction of adjacent permanent teeth. CBCT enables clear and three dimensional images, and it may be helpful to determine the exact location and to measure the dimensions of the supernumerary tooth to avoid any complication during the extraction process. The aim of the present study was to evaluate the accuracy of CBCT on measuring the tooth length and crown width of impacted supernumerary teeth. Twenty-five impacted supernumerary teeth were evaluated using CBCT, and each . . .sample's tooth length and crown width were measured prior to the extraction. After all the extractions were completed, the actual measurements were performed on the same samples. The differences between CBCT and actual measurements were evaluated statistically. Measurements on CBCT images were significantly larger than the actual measurements on tooth length and crown width. For tooth length and crown width, p value was found as 0.045, and Daha fazlası Daha az

Çiçek E. | Koçak M.M. | Sa?lam B.C. | Koçak S.

Article | 2015 | Scanning37 ( 1 ) , pp.49 - 53

The aim of this study was to evaluate the dentinal microcrack formation of ProTaper Universal, ProTaper Next, and WaveOne. Sixty extracted mandibular molars were selected. The mesial roots were resected and randomly divided into four groups (n=15). The canals were prepared with hand files (group 1), ProTaper Universal (group 2), ProTaper Next (group 3), and WaveOne (group 4) instrument systems. The roots were separated horizontally at 3, 6, and 9mm from the apex. Digital images were captured at ×40 magnification using scanning electron microscopy to detect microcrack formation. Statistical analysis was performed by Pearson Chi-squar . . .e test. The prevalence of microcracks in group 2, group 3, and group 4 were significantly higher when compared to group 1 (p0.05) in all sections. All instruments caused microcracks except for hand file. The highest percentage of microcrack was recorded in 3mm section for all groups. © 2014 Wiley Periodicals, Inc Daha fazlası Daha az

Türker S.A. | Sa?lam B.C. | Koçak M.M. | Koçak S.

Article | 2014 | Scanning36 ( 6 ) , pp.608 - 613

The aim of this study was to evaluate the effect of glide path preparation on the surface topography changes of WaveOne and OneShape single files using atomic force microscopy analysis. Two commercially available brands of single file systems were analyzed, including 15 specimens/brand as following: Group I; WaveOne 0.08/25 (Dentsply Maillefer, Ballaigues, Switzerland) and Group II; OneShape 0.06/25 (Micro Mega, Besançon, France). In each group, 3 new files were subjected to AFM analysis as received from manufacturer, and 12 files were analyzed after preparation of root canals. A total of 20 human maxillary molar teeth were selected . . .. In each group, 12 files were divided into 4 subgroups according to instruments that were used in one or three root canals with or without a previous glide path (n3). After preparation the surface analysis of single files was performed on 11 different points located along a 3-mm section starting at the tip of each file using AFM. Root mean square (RMS) values were recorded to investigate the surface features of endodontic files. The differences between RMS values were tested by one-way ANOVA. There was no statistically significant difference between the groups (p>0.05). Creation of a glide path did not affect the surface topography of single file systems. © 2014 Wiley Periodicals, Inc Daha fazlası Daha az

Koçak S. | Koçak M.M. | Sa?lam B.C. | Aktaş E.

Article | 2014 | Scanning36 ( 5 ) , pp.512 - 516

The aim of this study was to compare in vitro reduction of Enterococcus faecalis by using three agitation methods. Fifty-five mandibular premolar teeth were used. The root canals were prepared by using ProTaper instruments to size F4. Fresh bacterial suspensions were inoculated into each canal and the teeth were incubated at 37°C under aerobic conditions for 3 weeks. The specimens in negative control group were not contaminated and the teeth in positive control receive no further instrumentation or irrigation after contamination. The contaminated teeth were divided into three experimental groups and two control groups. The experimen . . .tal groups were as follows according to agitation of NaOCl irrigation solution; group 1, the brush-covered NaviTip FX needle; group 2, EndoVac apical negative pressure irrigation system; and group 3, self-adjusting file (SAF). Following the final irrigation, samples obtained with sterile #40 H-file from teeth and the file used were placed into sterile microcentrifuge tubes. After the incubation period, bacterial colony numbers were noted as CFU/ml. Three teeths were randomly selected from each group for scanning electron microscope evaluation. The three groups were compared with the Kruskal-Wallis test. Comparisons between three groups were made with the Mann-Whitney U-test with Bonferroni correction. SAF was significantly effective in elimination of E. faecalis when compared to EndoVac (p0.05). In conclusion, agitation of NaOCl with SAF for 2 min may be an effective alternative approach. © 2014 Wiley Periodicals, Inc Daha fazlası Daha az

Çiçek E. | Keskin Ö.

Article | 2015 | Scanning37 ( 3 ) , pp.193 - 196

The purpose of this study was to determine the effectiveness of EDTA and MTAD at different temperatures as a final irrigant to remove the smear layer after the use of 5.25% NaOCl. Seventy-eight human mandibular premolars with single straight canal were prepared by a crown-down technique using rotary 0.06 taper nickel-titanium files. Final irrigation was performed with EDTA and MTAD at different temperatures. The removal of the smear layer in the coronal, middle and apical level of each canal was examined under scanning electron microscope. No difference was found between the EDTA and MTAD at 4°C, 25°C, and 37°C temperatures regardle . . .ss of the canal level (coronal, middle and apical) (P = 0.286). In EDTA-25, EDTA-37, MTAD-25, and MTAD-37 groups, the difference among the coronal, middle, and apical levels were statistically no significant (P > 0.05). Our findings showed that EDTA and MTAD at 25°C and 37°C are more effective than EDTA and MTAD at 4°C even in the apical level. © 2015 Wiley Periodicals, Inc Daha fazlası Daha az