scholarly journals Elimination of intracanal infection in dogs' teeth with induced periapical lesions after rotary instrumentation: influence of different calcium hydroxide pastes

2006 ◽  
Vol 14 (3) ◽  
pp. 172-177 ◽  
Author(s):  
Janir Alves Soares ◽  
Mário Roberto Leonardo ◽  
Léa Assed Bezerra da Silva ◽  
Mário Tanomaru Filho ◽  
Izabel Yoko Ito
Keyword(s):  
Calcium Hydroxide ◽  
Wilcoxon Test ◽  
Significance Level ◽  
Periapical Lesions ◽  
Root Canals ◽  
Group 4 ◽  
Large Numbers ◽  
Microbiological Sample ◽  
Group 2 ◽  
Viridans Group Streptococci

The aim of this study was to evaluate the antiseptic efficacy of rotary instrumentation associated with calcium hydroxide-based pastes prepared with different vehicles and antiseptics. Chronic periapical lesions were experimentally induced in 72 premolar root canals of four dogs. Under controlled asepsis, after initial microbiological sampling (A1), the root canals were instrumented using the ProFile system in conjunction with 5.25% sodium hypochlorite and the intracanal medication was placed. Four experimental groups were formed according to the pastes used: group 1- Calen (n=18), group 2- Calen+CPMC (n=20), group 3- Ca(OH)2 p.a.+ anaesthetic solution (n=16) and group 4- Ca(OH)2 p.a.+ 2% chlorhexidine digluconate (n=18). After 21 days, the pastes were removed; the canals were emptied and 96 hours later a second microbiological sample was obtained (A2). The incidence of positive microbiological cultures and the number of cfus in stages A1 and A2 were compared statistically by the Wilcoxon test while the influence of the different treatments in intracanal infection was evaluated by Kruskal-Wallis test at 5% significance level (p<0.05). Large numbers of strict and facultative anaerobes, and viridans group streptococci were found in 100% of root canals of A1 samples. Among A2 samples, all treatments showed significant reduction of cfus and positive cultures (p<0.05), but only groups 3 and 4 showed 100% of root canals free of microorganisms. Rotary instrumentation plus NaOCl 5.25% associated with intracanal medication produced a drastic reduction or elimination of intracanal microbiota, whose performance was not influenced by the nature of the vehicle or the antiseptic added to the Ca(OH)2 p.a.

scholarly journals Influence of calcium hydroxide points on the quality of intracanal dressing filling

2006 ◽  
Vol 14 (3) ◽  
pp. 219-223 ◽  
Author(s):  
Nicole de Mello Rahde ◽  
José Antonio Poli Figueiredo ◽  
Elias Pandonor Motcy Oliveira
Keyword(s):  
Calcium Hydroxide ◽  
Root Canal Filling ◽  
Human Teeth ◽  
Significance Level ◽  
Root Canals ◽  
Gutta Percha ◽  
Group 2 ◽  
Post Hoc

PURPOSE: The aim of this study was to evaluate, in vitro, the quality of calcium hydroxide [Ca(OH)2] paste filling (Ultracal, Ultradent) associated or not with Ca(OH)2-containing gutta-percha points (Calcium Hydroxide Plus PointsTM, Roeko) in curved root canals. MATERIAL AND METHODS: One hundred and twenty roots of extracted human teeth, randomly divided into three curvature ranges (mild - 0 to 14º; moderate - 15º to 29º; severe - >30º) were used. After chemomechanical preparation, the roots were assigned to 4 groups (n=30), according to the technique of intracanal dressing placement: group 1 - Ca(OH)2 paste was applied with a lentulo spiral; group 2 - Ca(OH)2 paste was applied with a lentulo spiral and a Ca(OH)2 point was inserted into the canal; group 3 - Ca(OH)2 paste was applied with a NavitipTM tip (supplied with Ultracal system); group 4 - Ca(OH)2 paste was applied with a NavitipTM tip and a Ca(OH)2 point was inserted into the canal. The roots were cleared and the quality of apical third filling was assessed by a calibrated experienced examiner. The specimens were examined under stereomicroscopy and scored 1 to 4 (i.e., from inadequate to complete root canal filling). The results were analyzed statistically by ANOVA and Duncan's post hoc test at 5% significance level. RESULTS: There were no statistically significant differences (p>0.05) among the curvature degrees in groups 1, 3 and 4. Severely curved roots in group 2 presented bordering significance (p=0.05). The groups that associated the use of Ca(OH)2 paste and points (2 and 4) showed better apical filling than the other groups, but this difference was statistically significant (p<0.001) only for roots with severe curvature. CONCLUSION: According to the results of this study, the curvature degree did not influence the quality of filling. The techniques that used Ca(OH)2-containing gutta-percha points yielded better filling of the apical third in roots with severe curvature.

scholarly journals In vivo microbiological evaluation of the effect of biomechanical preparation of root canals using different irrigating solutions

2006 ◽  
Vol 14 (2) ◽  
pp. 105-110 ◽  
Author(s):  
Mário Tanomaru Filho ◽  
José Carlos Yamashita ◽  
Mario Roberto Leonardo ◽  
Léa Assed Bezerra da Silva ◽  
Juliane Maria Guerreiro Tanomaru ◽  
...  
Keyword(s):  
Saline Solution ◽  
Antimicrobial Effect ◽  
Control Group ◽  
Periapical Lesions ◽  
Root Canals ◽  
Group 4 ◽  
Number Of Microorganisms ◽  
Group 3 ◽  
Group 2

The aim of this study was to evaluate the antimicrobial effect of biomechanical preparation using different irrigating solutions. Seventy-eight root canals from premolars of four dogs were used. After experimental induction of periapical lesions, the root canals were prepared using the following solutions for irrigation: Group 1) 2.5% sodium hypochlorite (NaOCl); Group 2) 2% chlorhexidine (CHX); Group 3) saline solution and Group 4) control group with no biomechanical preparation. The microbiological evaluation of the root canals was performed by counting the colony forming units (CFUs) using different culture mediums. Two absorbent paper cones were used in each root canal in order to collect the microbiological samples before, and thirty days after the biomechanical preparation. The culture plates were incubated in aerobic, anaerobic and microaerophilic environment. Statistical evaluation was carried out using analysis of variance, Tukey and Student tests. The results demonstrated that there was reduction in the number of microorganisms in the NaOCl and CHX groups (p<0.05). There was greater effectiveness in the chlorhexidine group. The group that used saline solution and the control group presented an increased number of microorganisms. It can be concluded that the use of antimicrobial irrigating solutions during biomechanical preparation promotes the reduction of endodontic microbiota. However, a considerable number of microorganisms were still observed.

scholarly journals Apical extrusion of debris by manual and mechanical instrumentation

2007 ◽  
Vol 18 (1) ◽  
pp. 16-19 ◽  
Author(s):  
Lilia E. Leonardi ◽  
Diana M. Atlas ◽  
Guillermo Raiden
Keyword(s):  
Root Canal ◽  
Significance Level ◽  
Root Canals ◽  
Group 4 ◽  
Apical Extrusion ◽  
Working Length ◽  
Significant Difference ◽  
Group 3 ◽  
Group 2 ◽  
Group 1

The aim of the present study was to assess the presence of apically extruded debris and evaluate the influence of canal curvature on the amount of debris produced by manual and mechanical techniques. Forty single-rooted mature teeth with 15 to 30 degree of root canal curvature were selected. The presence of only one foramen was confirmed using a magnifying lens. A size 15 K-file was placed up to the apical foramen to determine the patency. Working length was determined with the same instrument, 1 mm short of the foramen. According to the employed technique, the groups were labeled as follows: Group 1 - Manual instrumentation with Mor-flex files; Group 2 - Mechanical instrumentation with Cursor and Mor-flex files; Group 3 - Manual instrumentation with Flexi-cut files; Group 4 - Mechanical instrumentation with Cursor and Flexi-cut files. During instrumentation, the root canals were irrigated with 20 mL. Debris extruded through the apical foramen was collected using the Myers and Montgomery technique. The values (in mg) were: Group 1: 0.422 ± 0.683; Group 2: 0.688 ± 0.795; Group 3: 0.409 ± 0.323; Group 4: 0.810 ± 0.708. Data were analyzed statistically by ANOVA at 5% significance level. There was no statistically significant difference among the groups (p<0.05). No statistically significant differences were found between slight and moderate curvatures in terms of the amount of extruded debris (p>0.05).

scholarly journals Antimicrobial potential of medicaments used in healing process in dogs' teeth with apical periodontitis

2004 ◽  
Vol 15 (3) ◽  
pp. 181-185 ◽  
Author(s):  
Carlos Estrela ◽  
Roberto Holland ◽  
Pedro Felício Estrada Bernabé ◽  
Valdir de Souza ◽  
Cyntia R.A. Estrela
Keyword(s):  
Calcium Hydroxide ◽  
Microbial Growth ◽  
Healing Process ◽  
Brain Heart Infusion ◽  
Apical Periodontitis ◽  
Root Canals ◽  
Antimicrobial Potential ◽  
Group 4 ◽  
Group 3 ◽  
Group 2

The objective of this study was to evaluate the influence of irrigants on the antimicrobial potential of calcium hydroxide paste in dogs' teeth with apical periodontitis. Forty-eight premolar teeth of adult mongrel dogs had their root canals opened to the oral environment for 6 months. The root canals were prepared and treated with different irrigating solutions and intracanal medicaments, according to the following groups: 1) 2.5% sodium hypochlorite (NaOCl) + calcium hydroxide paste (CHP); 2) 2% chlorhexidine (CHX) + CHP; 3) vinegar + CHP; 4) vinegar + vinegar. In group 4, both the irrigating solution and intracanal medicament were vinegar, which was renewed every 7 days. Each sample was collected by using two paper points maintained in position for 1 min, and individually transported and immersed in 7 mL of Letheen broth (LB), followed by incubation at 37ºC for 48 h. Microbial growth was analyzed by two methods: turbidity of the culture medium and subculture on a specific nutrient broth (brain heart infusion). After 21 days, all experimental groups had microbial growth, however, in different percentages: group 1 - 30%; group 2 - 30%; group 3 - 40%; group 4 - 60%. All materials tested had antimicrobial potential; however, the influence of calcium hydroxide paste on the control of microorganisms must be remembered.

scholarly journals Calcium Hydroxide improves epoxy sealer adhesion on root dentin

2017 ◽  
Vol 20 (2) ◽  
pp. 108
Author(s):  
Carlos Henrique Ribeiro Camargo ◽  
Bruna Pastro De Lara ◽  
Gleyce Oliveira Silva ◽  
Noala Vicensoto Moreira Milhan ◽  
Simone Helena Ferreira Gonçalves ◽  
...  
Keyword(s):  
Bond Strength ◽  
Calcium Hydroxide ◽  
Human Teeth ◽  
Ultrasonic Agitation ◽  
Root Canals ◽  
Group 4 ◽  
Two Factors ◽  
Root Dentin ◽  
Group 5 ◽  
Group 2

<p><strong>Objective</strong>: The aim of this study is to evaluate the adhesion of an endodontic sealer (AHPlus in root canals after the use of different protocols of 17% EDTA and the use of intracanal medication (ICM) based on calcium hydroxide in aqueous vehicle. <strong>Material and Methods</strong>: For this, 72 single-rooted human teeth were instrumented up to #50 and divided into six groups (n = 12). Group 1: EDTA for 3 min; Group 2: 3 mL of EDTA + 3 min of EDTA; Group 3: 3 mL of EDTA + 3 min of EDTA + 30 seconds of ultrasonic agitation; Group 4: EDTA for 3 min + ICM; Group 5: 3 mL of EDTA + 3 min of EDTA + ICM; Group 6: 3 mL of EDTA + 3 min of EDTA + 30 seconds of ultrasonic agitation + ICM. The root canals were filled with endodontic sealer after each protocol and after 7 days they were prepared to the push-out test. The data were analyzed using ANOVA two factors (p &lt; 0.05). <strong>Results</strong>: It was observed no statistically difference in bond strength in the 3 different 17% EDTA protocols. However, the use of ICM increased significantly the resistance adhesion. <strong>Conclusion</strong>: Intracanal medication based on calcium hydroxide improved the bond strength of AHPlus to dentin walls, regardless of the EDTA protocol.</p><p><strong>Keywords</strong></p><p>Calcium hydroxide; EDTA; Dentin.</p>

scholarly journals Residual antibacterial activity of chlorhexidine digluconate and camphorated p-monochlorophenol in calcium hydroxide-based root canal dressings

2007 ◽  
Vol 18 (1) ◽  
pp. 8-15 ◽  
Author(s):  
Janir Alves Soares ◽  
Mario Roberto Leonardo ◽  
Mário Tanomaru Filho ◽  
Léa Assed Bezerra da Silva ◽  
Izabel Yoko Ito
Keyword(s):  
Antibacterial Activity ◽  
Calcium Hydroxide ◽  
Bacterial Growth ◽  
Micrococcus Luteus ◽  
Chlorhexidine Digluconate ◽  
Significance Level ◽  
Periapical Lesions ◽  
Root Canals ◽  
Anesthetic Solution ◽  
Inhibition Zones

The purpose of this study was to evaluate the residual antibacterial activity of several calcium hydroxide [Ca(OH)2]-based pastes, placed in root canals of dogs' teeth with induced chronic periapical lesions. Root canals were instrumented with the ProFile rotary system and filled with 4 pastes: G1 (n=16): Ca(OH)2 paste + anesthetic solution; G2 (n=20): Calen® paste + camphorated p-monochlorophenol (CMCP); G3 (n=18): Calen®; and G4 (n=18): Ca(OH)2 paste + 2% chlorhexidine digluconate. After 21 days, the pastes were removed with size 60 K-files and placed on Petri plates with agar inoculated with Micrococcus luteus ATCC 9341. Pastes that were not placed into root canals served as control. After pre-diffusion, incubation and optimization, the inhibition zones of bacterial growth were measured and analyzed by Mann-Whitney U test at 5% significance level. All pastes showed residual antibacterial activity. The control samples had larger halos (p<0.05). The mean residual antibacterial activity halos in G1, G2, G3 and G4 were 7.6; 10.4; 17.7 and 21.4 mm, respectively. The zones of bacterial growth of G4 were significantly larger than those of G1 and G2 (p<0.05). In conclusion, regardless of the vehicle and antiseptic, all Ca(OH)2-based pastes showed different degrees of measurable residual antibacterial activity. Furthermore, unlike CMCP, chlorhexidine increased significantly the antibacterial activity of Ca(OH)2.

scholarly journals Fracture Resistance of Over Flared Endodontically Treated Central Incisors Restored with Multiple Prefabricated and Custom-Made Glass Fiber Posts

2021 ◽  
Author(s):  
Fatemeh Darvishi ◽  
Parnian Alizadeh Oskoee ◽  
Mohammad Esmaeel Ebrahimi Chaharom ◽  
Amir Ahmad Ajami ◽  
Soodabeh Kimyai
Keyword(s):  
Glass Fiber ◽  
Fracture Resistance ◽  
Longitudinal Axis ◽  
Significance Level ◽  
Root Canals ◽  
Group 4 ◽  
Fiber Posts ◽  
Custom Made ◽  
Glass Fiber Posts ◽  
Group 2

Objectives: This study aimed to evaluate the fracture resistance of over flared endodontically treated bovine central incisors restored with prefabricated and custom-made glass fiber posts, using the multi-post approach.  Materials and Methods: Sixty-eight crownless over flared endodontically treated incisors were used for this study. The depth of prepared post space was 10 mm, and the remaining dentin thickness of the roots was 1 mm. The samples were randomly divided into four groups (n=17): Group 1: two prefabricated glass fiber posts; group 2: prefabricated glass fiber post + braided glass fiber; group 3: braided glass fiber; group 4: no post. Static load was applied at a crosshead speed of 0.5 mm/min at 135º angle relative to the root longitudinal axis until fracture. The data were analyzed using one-way ANOVA and post hoc Tukey’s test at a significance level of P<0.05. Results: Groups 3 and 4 exhibited the maximum (981 N) and minimum (461 N) fracture strength values, respectively. The differences between group 4 and other groups were significant (P<0.001), but the differences between groups 1, 2, and 3 were not significant (P>0.05). Conclusion: Multiple prefabricated and custom-made glass fiber posts significantly increased the fracture resistance of crownless endodontically treated central incisors with over flared root canals.

scholarly journals Comparative evaluation of postoperative pain intensity after single-visit and multiple-visit retreatment cases: a prospective randomized clinical trial

2018 ◽  
Vol 21 (1) ◽  
pp. 26 ◽  
Author(s):  
Hatice Miray Uyan ◽  
Keziban Olcay ◽  
Mutlu Özcan
Keyword(s):  
Postoperative Pain ◽  
Repeated Measures ◽  
Control Group ◽  
Periapical Lesions ◽  
Single Visit ◽  
Group 4 ◽  
Multiple Visit ◽  
Significant Difference ◽  
Group 3 ◽  
Group 2

<p><strong>Objective:</strong> This study was designed to evaluate postoperative pain after endodontic retreatment. <strong>Material and Methods:</strong> Asymptomatic, multi-rooted molar &amp; premolar teeth requiring retreatment with 2–5 mm periapical lesions were included. Seventy-eight teeth were randomly placed in four groups (n=20): single-visit (control, group 1), Ledermix (group 2), metronidazole, ciprofloxacin, minocycline mixture (group 3), calcium hydroxide (group 4). The postoperative pain was recorded using a VAS at 6, 12, 24, and 48 h after retreatment. Statistical evaluation was performed using Two-Way Repeated Measures ANOVA and Tukey test. <strong>Results:</strong> Mild pain occurred in 67.5%, moderate in 30%, and flare-ups in 2.5%, and there was a significant difference between the groups (p&lt;0.01). Significantly lower postoperative pain was observed in TAP and CaOH<sub>2 </sub>groups(p&lt;0.05). In the 6, 12, and 24 h intervals, there was a significant difference in the pain levels (p&lt;0.05). <strong>Conclusion:</strong> TAP and CaOH<sub>2</sub> are effective for reducing postoperative pain after retreatment.</p><p><strong>Keywords</strong></p><p>Intracanal medicaments; Multiple-visit; Postoperative pain; Retreatment; Single-visit.</p>

scholarly journals In vitro evaluation of apical sealing in root apex treated with demineralization agents and retrofiled with mineral trioxide aggregate through marginal dye leakage

2005 ◽  
Vol 16 (3) ◽  
pp. 187-191 ◽  
Author(s):  
Claudio Hideki Kubo ◽  
Ana Paula Martins Gomes ◽  
Maria Nadir Gasparoto Mancini
Keyword(s):  
Mineral Trioxide Aggregate ◽  
Root Apex ◽  
Solution Ph ◽  
Significance Level ◽  
Group 4 ◽  
Group 3 ◽  
Group 2 ◽  
Agent Group ◽  
Group 1

The purpose of this study was to evaluate the apical seal in root apex treated with different demineralization agents and retrofilled with mineral trioxide aggregate (MTA) using marginal dye leakage. Fifty-six, human single-rooted teeth were instrumented, filled, resected and had retrofilling cavities prepared with ultrasonic tips. Demineralizing agents were applied before the apical cavities were retrofilled with Pro Root MTA. The specimens were assigned to 4 groups (n=14), as follows: group 1 (no demineralizing agent); group 2 (35% phosphoric acid, for 15 s); group 3 (17% EDTA solution, pH 7, for 3 min); and group 4 (24% EDTA gel, pH 7, for 4 min). The extension of dye (2% rhodamine B, at 37°C, for 24 h) penetration was measured in millimeters using a stereomicroscope. Results were statistically analyzed by ANOVA and Tukey's test at 5% significance level. Among the experimental groups, the least extension of dye penetration was observed in group 1 (1.89 mm), followed by groups 2 (2.18 mm), 4 (2.54 mm) and 3 (2.64 mm). No statistically significant differences (p<0.05) were found in marginal microleakage among groups 1, 2 and 4 and groups 2, 3 and 4. Based on the results obtained in this study, it may be concluded that the application of demineralizing agents cannot be recommended when MTA is used in periradicular surgeries.

Dentin Bond Strength of Composites with Self-etching Adhesives Using LED Curing Lights

2007 ◽  
Vol 8 (5) ◽  
pp. 34-42 ◽  
Author(s):  
Yonca Korkmaz ◽  
Nuray Attar
Keyword(s):  
Bond Strength ◽  
Testing Machine ◽  
Significance Level ◽  
Group 4 ◽  
Group 6 ◽  
Group 3 ◽  
Curing Light ◽  
Group 5 ◽  
Group 2 ◽  
Self Etch

Abstract Aim The purpose of this study was to investigate the effect of light-emitting diode (LED) light curing units (LCUs) compared with halogen LCUs on the shear bond strength (SBS) of one nanofill composite (Filtek Supreme) and one microhibrid composite (Artemis) with self-etch adhesives. Methods and Materials The buccal surfaces of 60 non-carious extracted human molars were flattened to expose dentin and, subsequently, polished for 60 seconds with 600-grit wet silicon carbide abrasive paper. Specimens were assigned into six groups (n=10) according to composite material, self-etch adhesive, and curing light used as follows: Group 1: Adper Prompt L-Pop (AP) and Filtek Supreme (FS) using an Elipar Free Light (EFL); Group 2: AP and FS using an Elipar Free Light 2 (EFL2); Group 3: AP and FS using a Hilux Expert (HE) light, Group 4: AdheSE (AS)+Artemis (AR) using an EFL; Group 5: AS+AR using an EFL2; and Group 6: AS+AR using a HE light. The specimens were thermocycled for 500 cycles (5°C–55°C) and then loaded to failure in a Zwick universal testing machine at a crosshead speed of 5 mm/minute. SBS values were calculated as megapascals (MPa) and statistically analyzed using the one-way analysis of variance (ANOVA) test at a significance level of 0.05. Results Mean SBS (± standard deviations) values were as follows: Group1: 15.99±5.18; Group 2: 18.76±6.71; Group 3: 17.70±5.04; Group 4: 16.93±3.99; Group 5: 18.01±5.19, and Group 6: 17.46±5.40. There were no statistically significant differences for SBS to dentin among the groups tested. Conclusion The LED curing lights used in the study seem to be comparable with the halogen curing light for nanofill and microhybrid composites used in conjunction with self-etching systems in dentin. The EFL2 reduces curing time, which can be considered as an advantage. Citation Korkmaz Y, Attar N. Dentin Bond Strength of Composites with Self-etching Adhesives Using LED Curing Lights. J Contemp Dent Pract 2007 July;(8)5:034-042.

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