Abstarct

The purpose of this study was to evaluate the potential of using mineral trioxide aggregate (MTA) as a root canal filling material by comparing its apical sealing ability with that of laterally condensed gutta-percha with sealer in extracted one canal teeth. In addition, this study was evaluating the MTA and ZnPo4 cement as barriers to coronal microleakage.Forty single canal extracted teeth, were prepared in a standard manner using GT file, randomly divided into two groups of 20 teeth, and obturated with laterally condensed gutta-percha or MTA.In each group, 10 teeth received a 4-mm barrier of MTA or ZnPo4 cement. The sealing ability of each part was assessed by immersion in 1% methylene blue dye for 72 h. The leakage was recorded in apical and coronal part. Data were analyzed by One-Way ANOVA test, T-test, and LSD test.Canal filled with laterally condensed gutta-percha showed significantly less apical dye penetration than canals obturated with MTA. However, coronal barrier filled with MTA showed significantly less dye penetration than ZnPo4 cement barrier.

Keywords

Export bibliographic record

Choose an application

• Reference Manager
• EndNote
• BibTex

Abstarct

The purpose of this study was to investigate the effect of different post space preparation techniques and times on the apical seal of two types of gutta-percha obturation techniques. Materials and methods: Two hundred extracted human lower premolars were selected for this study. All teeth were decoronated to adjust the working length at 14 mm. The canals were instrumented with ProTaper rotary instruments to size F3. The (200) root canals were randomly divided into two groups (100) of each according to the obturating method. Then each group was sub divided into (10) sub groups (10) of each (2 control groups and 8 experimental groups). Nine mm segment of gutta-percha was removed from the roots in each of the experimental groups either immediately after obturation or 7 days later using either heated pluggers, or Gates-Glidden drills or ProTaper rotary instruments or peeso reamers. The roots in the control groups were left without any post space preparation. The canal orifice of the roots in the experimental groups was sealed with amalgam. The extend of linear dye leakage was measured in mm with a stereomicroscope at (X 20). One-way ANOVA and sheffe statistical analysis were performed to the data collected. Results: The groups with ProTaper rotary instrument prepared the post space immediately after obturation( gps 3,11), showed the lowest mean leakage, but the difference was not statistically significant than the other experimental groups. T-test represented no significant differences existed at either two time interval studied and the type of obturation techniques. Sheffe-test for the post space preparation techniques revealed that there were a significant differences occurred with the use of ProTaper rotary instruments regardless the time interval and the obturation techniques. Conclusions: ProTaper rotary instrument provided less microleakage comparing to the other instruments used to prepare the post space. The post space preparation did not affect the apical seal in comparison with that of the intact filling.

Keywords

Export bibliographic record

Choose an application

• Reference Manager
• EndNote
• BibTex

Abstarct

Background: This study aimed to evaluate and compare the apical microleakage of roots canal filled with coldlateral condensation of gutta-percha, cold lateral condensation of Resilon, Thermafil and RealSeal1 bondedobturation.Materials and methods: Sixty freshly extracted maxillary first molars with straight palatal roots .Using diamond disc burwith straight hand piece and water coolant the palatal roots of teeth were sectioned perpendicular to the long axisat the furcation area. All roots were prepared with crown-down technique using hand ProTaper system (Sx-F4).Theprepared roots randomly divided into 4 groups of fifteen roots each; the groups obturated with different obturationtechnique. In Group 1 roots obturated with( lateral condensation of gutta-percha), Group 2 was obturatedwith(lateral condensation of Resilon),group3 was obturated with (Thermafil) while in group4 obturated with( RealSeal1 bonded obturation).All the samples sealed coronally and stored in normal saline at 37°C for one week ,then all theroots submerged Indian ink for one week. The roots were cleared and the degree of linear dye penetration wasmeasured in millimeter by stereomicroscope under 40X magnification with calibrated scale ocular grid.Results: The results showed that the RealSeal1 bonded obturation leaked apically significantly higher than other testgroups, while the group of lateral condensation of gutta-percha exhibited the least value of apical microleakage.Conclusion: The complete hermetic apical seal cannot be created neither with gutta-percha nor with Real Seal1bonded obturation

Keywords

Export bibliographic record

Choose an application

• Reference Manager
• EndNote
• BibTex

Abstarct

Backgroound: This in vitro study was conducted to compare the apical seal of four obturation techniques afterdelayed post space preparation.Materials and methods: Sixty simulated straight canals in clear resin blocks were used. The samples which had thesame length, size of apical preparation and taper, were divided into four groups obturated with lateralcondensation, warm vertical compaction, Thermafil, and Softcore obturators. Apexit was used as root canal sealer.Delayed post space preparation was carried out by peeso reamers after one week leaving 6 mm of gutta-perchaapically. The coronal cavity was sealed and the samples immersed in 2 % methylene blue dye for 7 days after whichthe samples were examined by stereomicroscope and calibrated grid to measure apical dye leakage in mm.Results: Vertical compaction leaked significantly less than lateral condensation and Softcore, and Thermafil leakedsignificantly less than Softcore. Both Thermafil and Softcore were comparable to lateral condensation; there was nosignificant difference between vertical compaction and Thermafil.Conclusion: Thermafil and Softcore had no effect on the apical seal when delayed post preparation was consideredand that the apical seal obtained by Thermafil and Softcore was comparable to lateral condensation technique

Keywords

Export bibliographic record

Choose an application

• Reference Manager
• EndNote
• BibTex

Abstarct

Seventy canals from 35 mesial roots of extracted human mandibular molars were selected and divided into 2 groups. The group I was prepared mechanically with ProTaper system. And group II was prepared with hand ProTaper files. All canals were obturated with Thermafil technique and Topseal sealer. Apical microleakage and the time for preparation were recorded in each sub group. Five molars were used as control teeth. All specimens were stored in 100% humidity, and were suspended in methylene blue dye for 72h. Linear dye leakage was statistically different (T-test), while time preparation between two groups was not statistically different.

Keywords

Export bibliographic record

Choose an application

• Reference Manager
• EndNote
• BibTex

Abstarct

This in vitro study evaluated and compared the apical sealing ability of twoobturation techniques and two type of instrumentation. A total of 120 teeth werecollected randomly divided into two groups 60 roots prepared using hand protaper,other 60 roots prepared using rotary protaper .Each group was subdivided randomlyinto two obturation groups of 30 roots for each; in group A- obtura II was used ,andin group B-thermafill (TF) was used. Then the samples in all groups left for a week atroom temperature. After coronal sealing, all surfaces of the root covered with threelayer of nail polish except the apical 2mm, then each sample immersed in 10% blackIndian ink dye for 72 hours .After that the samples rinsed and nail polish removed.then samples cleared & decalcified.Data had been collected from independentexaminers and statistically analyzed using student t-test. The stereomicroscopicresults showed that there was highly significant difference between hand and rotaryinstrumentation, with in favor of rotary instrumentation technique. Concerning theobturation techniques, Thermafill showed best apical sealing followed by Obtura II;however, the differences were not significant.

Keywords

Export bibliographic record

Choose an application

• Reference Manager
• EndNote
• BibTex

Abstarct

The sealing ability of root canal filling materials is crucial to the goal ofpreventing reinfection via microleakage of microorganisms and their by-products.Thirty palatal canals of 12mm length from extracted upper first molars were selectedthen instrumented and divided into 3 groups. Group I was obturated with lateralcompaction technique, group II was obturated with warm vertical compactiontechnique and group III was obturated with Gutta-Flow system. Except for the apical2 mm, all other segments of roots for the 3 groups received two layers of nail varnishand immersed in a methylene blue 2% and stored at 37Cº for 30 days. Understereomicroscope liner dye leakage was measured. No statistical difference was foundbetween lateral compaction, warm vertical compaction and Gutta-Flow sealing ability.

Keywords

Export bibliographic record

Choose an application

• Reference Manager
• EndNote
• BibTex