A preliminary scanning electron microscopic study of root canals after endodontic procedures

McComb, Dorothy; Smith, Dennis C.

doi:10.1016/s0099-2399(75)80226-3

Cited by 602 publications

(453 citation statements)

References 7 publications

Supporting

Mentioning

364

Contrasting

Unclassified

Order By: Relevance

“…2 The smear layer is an amorphous film that is always formed by the action of endodontic instruments inside the root canal during chemomechanical preparation. 3,4 Since this residual layer can influence root canal filling quality, different techniques and solutions have been used and tested for its removal. 4,5 Chelating agents have been suggested for removal of the smear layer, 6,7 as well as for demineralization and softening of root dentin.…”

Section: Introductionmentioning

confidence: 99%

Effect of final irrigation protocols on microhardness reduction and erosion of root canal dentin

et al. 2017

View full text Add to dashboard Cite

This study aimed to evaluate the effect of final irrigation protocols on microhardness reduction and erosion of root canal dentin. Sixty root canals from mandibular incisors were instrumented and randomly divided into six groups (n = 10) according to the irrigant used: QMiX, 17% EDTA, 10% citric acid (CA), 1% peracetic acid (PA), 2.5% NaOCl (solution control), and distilled water (negative control). The chelating solutions were used to irrigate the canal followed by 2.5% NaOCl as a final flush. After the irrigation protocols, all specimens were rinsed with 10 mL of distilled water to remove any residue of the chemical solutions. Before and after the final irrigation protocols, dentin microhardness was measured with a Knoop indenter. Three indentations were made at 100 µm and 500 µm from the root canal lumen. Afterwards, the specimens were prepared for scanning electron microscopic analysis and the amount of dentin erosion was examined. Wilcoxon and Kruskal-Wallis tests were used to analyze the results with a significance level set at 5%. At 100 µm, all protocols significantly reduced dentin microhardness (p < .05), while at 500 µm, this effect was detected only in the EDTA and QMiX groups (p < .05). CA was the irrigant that caused more extensive erosion in dentinal tubules, followed by PA and EDTA. QMiX opened dentinal tubules, but did not cause dentin erosion. Results suggest that QMiX and 17% EDTA reduced dentin microhardness at a greater depth. Additionally, QMiX did not cause dentin erosion.

show abstract

Section: Introductionmentioning

confidence: 99%

Effect of final irrigation protocols on microhardness reduction and erosion of root canal dentin

et al. 2017

View full text Add to dashboard Cite

show abstract

“…McComb y Smith, en 1975, fueron los primeros en reportar la presencia del barro dentinal sobre las paredes del conducto radicular en un estudio bajo microscopia electrónica de barrido después del tratamiento endodóntico. 15 La remoción del barro dentinario reduce la microflora y sus endotoxinas, aumenta la capacidad de selle de los materiales de obturación y disminuye el potencial de sobrevivencia y reproducción de bacterias.…”

Section: Discussionunclassified

Capacidad De Difusión Del Ión Calcio a Través De La Dentina Radicular Utilizando Cuatro Tipos De Vehículos: Anestesia, Hidróxido De Calcio Calcifar®, Glicerina Y Polietilenglicol

Becerra¹,

Becerra

Moreno

2018

UstaSalud

View full text Add to dashboard Cite

Objetivo: Determinar la capacidad de difusión del ión calcio a través de la dentina radicular usando cuatro tipos de vehículos: Anestesia, hidróxido de calcio líquido Calcifar®, glicerina y polietilenglicol. Materiales y métodos: Se agruparon al azar, veinte dientes obturados con pasta preparada de hidróxido de calcio mezclado con hidróxido de calcio líquido, Calcifar®, 20 con anestesia, 20 con glicerina, 20 con polietilenglicol, 5 con Ultracal® (control positivo) y 5 sin procedimiento alguno. Los dientes fueron decoronados, se prepararon con la técnica de preparación biomecánica Crown -Down EDTA (RCprep) y se irrigaron con hipoclorito de sodio(NaOCI) al 5.25%. Se secaron con puntas de papel y se obturaron con pasta de hidróxido de calcio preparada. Luego fueron sumergidos en 2 mi de agua destilada estéril para realizar medidas de la concentración del ión calcio con el método calorimétrico, utilizando un Espectrofotómetro en diferentes períodos de tiempo: a los 1, 5, 15 y 30 días. Resultados: El mayor grado de difusión del ión calcio se obtuvo, el primer día, con anestesia difundiendo 39.6 mg/dl; en las comparaciones efectuadas entre períodos de tiempo con relación al vehículo, el grupo de anestesia 39.6mg/dl ± 26.4, hidróxido de calcio líquido Calcifar® 2.4mg/dl ± 41.3 y glicerina 37.Smg/dl ± 36.9. La difusión disminuyó significativamente a partir del quinto día. En todos los períodos de tiempo el vehículo que presentó mayor liberación de ión calcio fue la anestesia y la menor liberación fue dada por el polietilenglicol siendo constante durante los tiempos analizados. Conclusiones: El mejor vehículo para la liberación del hidróxido de calcio fue la anestesia. Los vehículos viscosos demostraron mantener constante la liberación de los iones calcio en todos los tiempos. [Becerra L, Becerra P, Moreno GC. Capacidad de difusión del ión calcio a través de la dentina radicular utilizando cuatro tipos de vehículos: Anestesia, hidróxido de calcio líquido Calcifar®, CALCIUM HYDROXIDE ION CAPABILITY OF DIFFUSION THROUGH THE RADICULAR DENTINE USING FOUR TYPES OF VEHICLES: ANAESTHESIA, LIQUID CALCIUM HYDROXIDE (CALCIFAR®), GLYCERIN AND POLYETHILGLYCOL ABSTRACTObjective: To determine the capacity of diffusion of the calcium ion through the radicular dentine using four vehicles: Anaesthesia, liquid calcium hydroxide, Calcifar®, glycerin and polyethilglycol. Materials and methods:The specimens were randomly grouped. Twenty teeth were filled with calcium hydroxide in paste mixed with aqueous calcium hydroxide (Calcifar®), 20 with anaesthesia, 20 with glycerin, 20 with polyethilglycol, 5 were filled with Ultracal and 5 were left with no treatment. The crowns of the teeth were eliminated, prepared with CROWN -DOWN biomechanical technique, EDTA (RCprep) was used and irrigated with NaOCl at 5.25%. They were dried with paper points and filled with calcium hydroxide then divided into 4 experimental groups and 1 control group. They were immersed in to 2 mi of sterile distilled water, to make measures of the ion calcium concentration w...

show abstract

“…EDTA has been suggested and widely used as an irrigation solution because it chelates calcium ions and removes the mineralized portion of smear layers (5,6,8). Although EDTA has a long history as an endodontic chelating agent, it has limited or no antibacterial activity (10) and a high surface tension value (16).…”

Section: Discussionmentioning

confidence: 99%

“…Sodium hypochlorite (NaOCl) has excellent antibacterial and dissolving abilities, as reported by several studies (4) and it is the solution of choice during root canal instrumentation. On the other hand, NaOCl cannot remove the smear layer formed on the canal walls during manual or rotary instrumentation (5). The smear layer may delay or prevent penetration of antimicrobial agents, such as endodontic irrigants.…”

Section: Introductionmentioning

confidence: 99%

Antimicrobial Effect and Surface Tension of Some Chelating Solutions with Added Surfactants

2016

View full text Add to dashboard Cite

This study assessed the antimicrobial efficacy and surface tension of established irrigating solutions with a new experimental chelating solution in infected dentin tubes. Twenty-five specimens were randomly assigned to each of the irrigating solutions. Twenty specimens were used as negative and positive controls. After 21 days of contamination with E. faecalis, the irrigating solutions MTAD, QMiX and Tetraclean NA were delivered into each infected root canal. The solutions were removed and dentin samples were withdrawn from the root canals with sterile low-speed round burs with increasing ISO diameters. The dentin powder samples obtained with each bur were immediately collected in separate test tubes containing 3 mL of BHI broth. After that, 100 μL from each test tube was cultured on blood agar. The grown colonies were counted and recorded as colony-forming units (CFU). The surface tension of the irrigants was measured using a Cahn DCA-322 Dynamic Contact Angle Analyzer. A Kruskal Wallis nonparametric ANOVA and a Friedman test were used (p<0.05). Tetraclean NA showed lower surface tension and CFU values than MTAD and QMiX. Better antibacterial action and low surface tension were observed for Tetraclean NA, probably due to the improved penetration into the root canal and dentinal tubes

show abstract

A preliminary scanning electron microscopic study of root canals after endodontic procedures

Cited by 602 publications

References 7 publications

Effect of final irrigation protocols on microhardness reduction and erosion of root canal dentin

Effect of final irrigation protocols on microhardness reduction and erosion of root canal dentin

Capacidad De Difusión Del Ión Calcio a Través De La Dentina Radicular Utilizando Cuatro Tipos De Vehículos: Anestesia, Hidróxido De Calcio Calcifar®, Glicerina Y Polietilenglicol

Antimicrobial Effect and Surface Tension of Some Chelating Solutions with Added Surfactants

Contact Info

Product

Resources

About