Morphologic and morphometric analysis of the root canal apical third cleaning after biomechanical preparation using 3.3% Ricinus communis detergent and 1% NaOCl as irrigating solutions

Abstract

This study evaluated, by morphologic and morphometric analyses, the cleaning of apical third of root canals instrumented with nickel-titanium rotary files using different irrigating solutions. Twenty-seven single-rooted mandibular premolars were assigned to three groups (n=9), according to the irrigating solution used: Group I, distilled and deionized water; Group II, 1% NaOCl; and Group III, 3.3% Ricinus communis detergent. Biomechanical preparation was performed with Protaper Plusâ nickel-titanium files as follows: S1, SX and S2 at the cervical and middle thirds, and 25/02, 25/04, 25/06, 30/02, 30/04 and 30/06 to complete the instrumentation, operating at 1 mm from the root apex. Irrigation was done at each file change with 2 mL of irrigating solution, totalizing 20 mL for each tooth. After biomechanical preparation, the apical thirds were serially sectioned and histologically processed. The cross-sections were examined by an optical microscope (X40) connected to a computer. The images were captured and analyzed using a computer software and submitted to morphometric analysis with aid of a grid. The percentage of debris remaining at the apical third was calculated. Data were submitted to statistical analysis by ANOVA and Tukey test. The results showed no statistically significant difference (p>0.01) between the groups irrigated with 1% NaOCl and 3.3% Ricinus communis detergent, which presented the lowest percentage of debris at the apical third, 8.49% and 10.11%, respectively. The group irrigated with distilled and deionized water had the highest percentage of debris (15.58%) and was statistically different from the other groups (p<0.01). It may be concluded that 3.3% Ricinus communis detergent and 1% NaOCl had similar cleaning effectiveness on removal of debris from root canals.

In vitro antimicrobial activity of auxiliary chemical substances and natural extracts on Candida albicans and Enterococcus faecalis in root canals

“…The literature has reported that irrigation with castor oil extract is capable of removing debris, showing similar results to 1% NaOCl 18 . Valera, et al 27 (2012) showed a significant decrease in the number of Escherichia coli in the root canals after irrigation with castor oil extract during the biomechanical preparation.…”

In vivo Comparison of the Duration between two Endodontic Instrumentation Techniques in Deciduous Teeth

“…Then root canals were previously enlarged with a #15 K file, and irrigated with 2 ml 1% sodium hypochlorite [10] at each file change [11].…”

“…After each instrument was used, irrigation was performed with 2 ml 1% sodium hypochlorite for both groups [10,11]; all canals were dried with absorbent paper points.…”

Diametral tensile strength and film thickness of an experimental dental luting agent derived from castor oil

“…In dentistry, membrane material 20 , sealers 17,23,24 and irrigating solution 18 were developed from vegetable polyurethane obtained from castor oil. Additionally, since this polyurethane has been described as being biocompatible, osteoconductor, osteoinductor, antimicrobial, osseointegrable and absorbable 8,16 , it has been used in bone prosthesis, alveolar healing and plastic surgery 16 .…”