Evaluation of apical deviation in root canals instrumented with K3 and ProTaper systems

OBJECTIVES: this study evaluated the apical deviation of curved root canals instrumented with K3 and ProTaper systems. MATERIAL AND METHODS: twenty root canals of human maxillary and mandibular first molars were employed, which were divided into 2 groups: group A (10 teeth) was instrumented with the K3 system, and group B (10 teeth) with the ProTaper system. Evaluation of deviation was performed by double radiographic exposure. Radiographs were achieved before and after instrumentation, with 0.3-second, thus allowing superimposition of images. Three-dimensional computerized tomograph was performed in 3 specimens in each group, as an additional means to evaluate the apical deviation. RESULTS: were evaluated by the parametric test Student-Newman-Keuls at 5%, which did not reveal significance between groups concerning the apical deviation. The results of computerized tomograph images demonstrated that the larger deviation of the root canal occurred at the distolingual area for both systems. CONCLUSIONS: both techniques produced a mild apical deviation. Computerized microtomography was shown to be accurate for experimental endodontics studies.

Download Full-text

Shaping Ability of ProTaper Next, WaveOne, and Reciproc in Simulated Root Canals

The Journal of Contemporary Dental Practice ◽

10.5005/jp-journals-10024-1951 ◽

2016 ◽

Vol 17 (11) ◽

pp. 902-906

Author(s):

Mateus R Tonetto ◽

EM Maia Filho ◽

RM dos Reis Santos ◽

Darlon M Lima ◽

SM da Silva Pereira ◽

...

Keyword(s):

Clinical Significance ◽

Root Canal ◽

Negative Impact ◽

Endodontic Treatment ◽

Root Canals ◽

Before And After ◽

Reciprocating Instruments ◽

Shaping Ability ◽

Curved Root Canals

ABSTRACT Introduction The study aimed to compare the shaping and preservation of the original curvature of simulated curved root canals using the following instruments: Reciproc (Rcp), WaveOne (Wo), and the ProTaper Next system (Ptn). Materials and methods A total of 45 resin blocks with simulated curved root canals were divided into three groups (n = 15), prepared using the Rcp (R25), Wo (25/0.8), and Ptn (X2) instruments. Standardized photographs were taken before and after canal instrumentation. After the superimposition of the images, the amount of resin removed from the curvature's inner and outer walls was measured at six apical levels, at intervals of 1 mm. The canals’ angles of curvature before and after instrumentation were subtracted. Results There were no significant differences between the instruments in terms of the total amount of resin removed of the inner or outer walls of the apical curvature (p > 0.05). The Rcp instruments provided the best resin removed ratios between the walls. The means of the change in angle were as follows: Wo = 2.15°, Ptn = 0.92°, and Rcp = 0.21°. WaveOne caused significantly higher deviations than Rcp. Conclusion All of the instruments demonstrated a tendency to straighten the simulated root canal. Instruments that use rotary movement achieved an effect similar to that of the reciprocating instruments in relation to change in angle. Clinical significance Deviations from the original shape of the root canal could have a negative impact on the quality of a filling and consequently on the success of the endodontic treatment. How to cite this article Maia Filho EM, dos Reis Santos RM, Lima DM, da Silva Pereira SM, Soares JA, de Jesus Tavarez RR, Ferreira MC, Carvalho CN, Bandeca MC, Tonetto MR, Borges AH, de Castro Rizzi C. Shaping Ability of ProTaper Next, WaveOne, and Reciproc in Simulated Root Canals. J Contemp Dent Pract 2016;17(11):902-906.

Download Full-text

Effect of Smear Layer on the Apical Seal of Endodontically Treated Teeth: An ex vivo Study

The Journal of Contemporary Dental Practice ◽

10.5005/jp-journals-10024-1090 ◽

2012 ◽

Vol 13 (1) ◽

pp. 23-26 ◽

Cited By ~ 1

Author(s):

KG Nischith ◽

GPV Srikumar ◽

Shuaib Razvi ◽

R Vinay Chandra

Keyword(s):

Root Canal ◽

Ex Vivo ◽

Smear Layer ◽

Control Group ◽

Endodontically Treated Teeth ◽

Root Canals ◽

Group A ◽

Group B ◽

Root Canal Irrigant ◽

Ex Vivo Study

ABSTRACT Aim The purpose of this study was to evaluate the effect of smear layer on apical seal of endodontically treated teeth. Materials and methods Sixty freshly extracted human maxillary central incisor teeth were selected and were randomly divided into two experimental groups. Group A of 25 teeth and group B of 25 teeth and a control group of 10 teeth. Cleaning and shaping of the root canals were performed using endodontic K-files up to no. 50 size file in step-back technique. During the process, in root canals of group A, 17% EDTA (ethylenediaminetetraacetic acid) followed by 3% NaOCl (sodium hypochlorite) was used as root canal irrigant. In group B, MTAD (mixture tetracycline citric acid and detergent) was used as a root canal irrigant. In control group, saline was used as root canal irrigant. The root surfaces were then coated with nail polish of both experimental groups and control group. The samples were then immersed in India ink dye for 1 week at 37°C. Results The statistical analysis of the results showed that the apical leakage was significantly more in teeth, where smear layer was not removed. Conclusion The removal of smear layer improves the longterm apical seal and success of endodontically treated teeth. Clinical significance The development and maintenance of apical seal is desirable and considered to be a major prerequisite to improve the outcome of root canal treatment. How to cite this article Nischith KG, Srikumar GPV, Razvi S, Chandra RV. Effect of Smear Layer on the Apical Seal of Endodontically Treated Teeth: An ex vivo Study. J Contemp Dent Pract 2012;13(1):23-26.

Download Full-text

Magnetic Resonance Imaging for Assessment of Endodontic Instruments’ Precision during “L-Shaped” Model Root Canals Preparation

Applied Sciences ◽

10.3390/app11031051 ◽

2021 ◽

Vol 11 (3) ◽

pp. 1051

Author(s):

Tomasz Olek ◽

Władysław P. Węglarz ◽

Agata Trzcionka ◽

Arkadiusz Dziedzic ◽

Marta Tanasiewicz

Keyword(s):

Magnetic Resonance Imaging ◽

Magnetic Resonance ◽

Root Canal ◽

Spin Echo ◽

Resonance Imaging ◽

Root Canals ◽

Mechanical Preparation ◽

Before And After ◽

Curved Root Canals

The purpose of the mechanical root canal preparation is to clean it and give it the right shape. The preparation should be carried out in a way that maintains the original curvature and initial orientation of the apical end. Insufficient root canal preparation may prevent effective chemical decontamination and obturation to the full working length. The study aims to evaluate the shaping ability and effectiveness of the NiTi rotary and reciprocating endodontic instruments, compared to standard hand files using magnetic resonance imaging based on spin echo. Material and methods: A comparative study of severely curved root canals’ shaping abilities using three NiTi systems and K-type hand files was performed, with 40 training “endo-blocks” presenting with “L-shaped” canal. The root canal topography and geometry “before” and “after” mechanical preparation obtained by the magnetic resonance imaging based on the spin echo was used. The main measurement was made using the RARE sequence, with slice thickness reduced to 100 micrometers. In order to improve the signal-to-noise ratio, NA = 25 was used. To minimize the measurement time, the field of view was limited to a cuboid 17 × 16 × 3 mm, with a resolution of 33 × 31 × 100 micrometers. Each 3D image consisted of 512 × 512 × 30 voxels. The imaging plane has been selected in such a way as to fully illustrate the course of curvature of the model root canal. For TR = 5 s and effective TE = 36 ms, TA was 1.5 h. Measurements were performed twice, before and after the preparation of endo-blocs with a selected type of endodontic tools. Results: The use of rotary NiTi instruments caused a substantial alteration in the curvature topography and angle of the canals and change in the curvature length. The substantial discrepancy was observed during the preparation of simulated root canals with the reciprocating instruments and the use of WaveOne files led to the largest volume variation. No dependence between the amount of material removed and the measured intracanal side was observed when NiTi instruments were used. Preparation with hand K-type files revealed a relationship between the measuring side and the amount of material removed, with the lower values obtained for the canals’ internal curvatures. Conclusions: All the studied endodontic instruments allow a safe preparation of curved root canals in simulating in vivo conditions. The abbreviation of original root canals topography does not seem to be significantly altered following mechanical preparation of simulated, severely curved root canals. The spin echo-based magnetic resonance imaging technique can be utilized for visualization of the internal topography of the root’s canals in vitro before and after their mechanical preparation in in vitro conditions. In the future, magnetic resonance microscopy may become a diagnostic tool supporting the work of a clinician.

Download Full-text

Shaping Ability of Reciproc, UnicOne, and Protaper Universal in Simulated Root Canals

The Scientific World JOURNAL ◽

10.1155/2015/690854 ◽

2015 ◽

Vol 2015 ◽

pp. 1-6 ◽

Cited By ~ 1

Author(s):

Etevaldo Matos Maia Filho ◽

Cláudia de Castro Rizzi ◽

Matheus Bandeca Coelho ◽

Sara Freitas Santos ◽

Luzia Mayanne Oliveira Costa ◽

...

Keyword(s):

Czech Republic ◽

Root Canal ◽

Root Canals ◽

Significant Difference ◽

Before And After ◽

Reciprocating Instruments ◽

Shaping Ability ◽

Reciprocating Movement ◽

Curved Root Canals

The study aimed to compare the shaping effects, preservation of the original curvature, and transportation of the apical foramen of Reciproc (VDW, Munich, Germany), UnicOne (Medin, Nové Město na Moravě, Czech Republic), and Protaper Universal (Dentsply Maillefer, Ballaigues, Switzerland) in simulated root canals. Thirty resin blocks with simulated curved root canals were distributed into three groups(n=10),and prepared using Reciproc (RCp), UnicOne (UnO) and the Protaper Universal (PTu). Standardized photographs were taken before and after the instrumentation, after which they were superimposed. Measurements were taken of the quantity of resin removed from the inner and outer walls of the curvature at 6 levels, the curvature angles before and after instrumentation, and the transportation of the apical foramen. RCp obtained the highest values for amount of resin removed from the inner wall while UnO demonstrated similar shaping on both the inner and outer walls. PTu produced the greatest transportation of foramen when compared to the reciprocating instruments. There was no significant difference between the groups in terms of the change in angle(P>0.05). All the instruments were capable of maintaining the original curvature of the root canal; however, the UnO, which used reciprocating movement, produced more conservative shapes with lower foramen transportation.

Download Full-text

The impact of different irrigants on the quality of root canal walls

Stomatoloski glasnik Srbije ◽

10.2298/sgs0703160s ◽

2007 ◽

Vol 54 (3) ◽

pp. 160-169

Author(s):

Goran Stojilkovic ◽

Jovanka Gasic ◽

Jelena Dakovic

Keyword(s):

Root Canal ◽

Smear Layer ◽

Control Group ◽

Complete Elimination ◽

Canal Irrigation ◽

Root Canals ◽

Root Canal Irrigation ◽

Combined Use ◽

Group A ◽

Group B

Introduction: Root canal irrigation plays an important part in the endodontic therapy. Inadequate irrigation or instrumentation without irrigation increase the accumulation of debris on the cutting surfaces of instruments as well as debris and smear layer on root canal walls. Aim: The aim of this study was to evaluate smear layer removal after irrigation with saline, 5% NaOCl, 15% EDTA and the combination of 15% EDTA and 5% NaOCl. Materials and Methods: The study was conducted at the Clinic for Dentistry and Institute for biomedical research of the School of Medicine in Nis. Twenty five premolars, extracted from orthodontic reasons, were allocated to 5 groups (A-E) of 5 teeth. Root canals of all teeth were instrumented using hand K files. Samples from Group A were instrumented without irrigation (control group). In Group B, the irrigation was done using saline, in Group C 5% NaOCl, in Group D 15% EDTA and in Group E the combination of 15% EDTA and 5% NaOCl. After the treatment, all samples were prepared for scanning electron microscopy (SEM). Central parts of root canals were examined and photomicrographs were taken at different magnification. The amount of debris and smear layer was quantified and the data were statistically analyzed. Results: All four treatment modalities (B, C, D, E) induced changes in the appearance of dentinal walls and the amount of debris and the smear layer compared to the control group (A). The difference between the control group and Group B was statistically significant (p<0.01) and highly significant between the control group and Groups C, D and E (p<0.0001). The combined use of 15% EDTA and 5% NaOCl for irrigation and 1 min final rinse resulted in a complete elimination of the smear layer; the use of saline, 5% NaOCl or 15% EDTA alone failed to remove the debris and smear layer completely. Conclusion: The use of singular solutions for root canal irrigation significantly reduces the amount of debris and the smear layer whereas the combined use of NaOCl and EDTA results in the complete elimination of the smear layer from root canal walls.

Download Full-text

Effectiveness of Parameters in Quantifying Root Canal Morphology Change after Instrumentation with the Aid of a Microcomputed Tomography

BioMed Research International ◽

10.1155/2019/9758176 ◽

2019 ◽

Vol 2019 ◽

pp. 1-6

Author(s):

Alexander Juhasz ◽

Csaba Hegedus ◽

Ildiko Marton ◽

Balazs Benyo ◽

Kaan Orhan ◽

...

Keyword(s):

Surface Area ◽

Root Canal ◽

Three Dimensional ◽

Cross Sectional ◽

Root Canals ◽

Digital Reconstruction ◽

Significant Difference ◽

Root Canal Morphology ◽

Canal Morphology ◽

Curved Root Canals

The objective of this study was to analyse the effectiveness of some parameters which characterise the change in morphology in human root canals subjected to ProTaper rotary enlargement with the help of an X-ray microfocus computed tomography (MCT) and to introduce a novel parameter that is effective in quantifying changes in root canal morphology. Ten each straight and curved root canals with mature apices chosen from extracted human upper incisor and canine teeth were scanned with MCT before and after canal shaping using ProTaper rotary instruments in order to facilitate three-dimensional digital reconstruction and quantitative gauging of relevant instrumental parameters and changes therein (surface area and volume). Root canal geometry change and the effectiveness of shaping were quantified with Structure Model Index change (ΔSMI) and surface area change to volume change ratio (ΔSA/ΔV). These two parameters were also tested on simulated canals. Postinstrumentation cross-sectional changes were also analysed, but only on the plastic blocks. Statistical analysis of parameters was carried out to verify the significance of results. Analysis of cross-sectional shape of postinstrumented resin simulated canals showed statistically significant decrease in Form Factor (p<0.05) and statistically significant increase in Eccentricity (p<0.005). ΔSMI did not show significant difference between straight and curved canals. SMI values showed bidirectional change during root enlargement which questions the reliability of this metric in analysing instrumentation. Statistically significant (p<0.005) deviations in ΔSA/ΔV were quantified as 1.92 and 3.22 for straight and curved human canals, respectively. Instrumentation-induced canal geometry change was determined to be more pronounced in curved canals using the novel parameter ΔSA/ΔV. This has been proven as being a statistically accurate and reproducible parameter for quantitative characterisation of root canal geometry change and differentiation of preparational efficacy for both straight and curved root canals.

Download Full-text

Three-dimensional Analysis of the Root Canal Preparation with Reciproc Blue, WaveOne Gold and XP EndoShaper. A New Method in vivo

10.21203/rs.3.rs-63578/v1 ◽

2020 ◽

Author(s):

Javier Caviedes-Bucheli ◽

Nestor Rios-Osorio ◽

Diana Usme ◽

Cristian Jimenez ◽

Adriana Pinzon ◽

...

Keyword(s):

3D Reconstruction ◽

Root Canal ◽

Three Dimensional ◽

File Systems ◽

Root Canal Preparation ◽

Paired Data ◽

Root Canals ◽

Single File ◽

Before And After

Abstract Background: Evaluation of changes in volume after root canal preparation. with single file rotary systems such as Reciproc-Blue, WaveOne-Gold and XP-EndoShaper, with a new in vivo study model using CBCT and 3D reconstructions on patients Methods: Thirty human lower premolars were randomly divided into three groups, in which the root canals were prepared using one of these single-file systems: Reciproc-Blue, WaveOne-Gold and XP-EndoShaper. Root canals were scanned before and after root canal preparation using CBCT, and a 3D reconstruction was performed with RHINOCEROS 5.0 software to assess the increase in canal volume for each group after instrumentation. The Anova test was used to determine statistically significant differences between the groups and Post-hoc Tukey's-test to compare the groups with each other. Results: The proposed 3D-reconstruction model allows to measure the variation of the volume within the root canal of the premolars studied. With this model, Reciproc-Blue showed higher increase in canal volume, followed by WaveOne-Gold and XP-EndoShaper (Anova p = 0.003). XP-EndoShaper did not show a statistically significant increase in canal volume after root canal preparation (Tukey's test for paired data p = 0.06 confirmed the results with each other).Conclusion: it is possible to use CBCT and 3D reconstruction as a model to study the preparation quality of the root canal in vivo. With this model, Reciproc-Blue showed higher increase in root canal volume, followed by WaveOne-Gold, while XP-EndoShaper did not significantly increase root canal volume during preparation.

Download Full-text

Influence of Taper of Root Canal Shape on the Intracanal Bacterial Reduction

The Open Dentistry Journal ◽

10.2174/1874210601610010568 ◽

2016 ◽

Vol 10 (1) ◽

pp. 568-574 ◽

Cited By ~ 5

Author(s):

Mary Th. Paraskevopoulou ◽

Marouan G. Khabbaz

Keyword(s):

Root Canal ◽

Bacterial Count ◽

Positive Control ◽

Multiple Hypothesis Testing ◽

Control Group ◽

Bacterial Reduction ◽

Root Canals ◽

Significant Difference ◽

Group A ◽

Group B

Objectives: Taper is a factor that determines final root canal dimensions and consequently, the space available for the cleaning action of irrigants. Therefore, the aim of this study was to investigate the influence of taper on intracanal bacterial reduction. Methods: Sterilized root canals of 25 mandibular incisors were inoculated with E. faecalis and then divided into two experimental groups and one control group (A= saline, B= NaOCl + EDTA and C= control, not prepared). Groups A and B were prepared to an apical size of #30/0.04, a culture was obtained and then prepared to #30/0.08 and cultured again. Final irrigation sequence was 30 ml of saline for group A and 10 ml of 17% EDTA followed by 10 ml of 2.5% NaOCl and 10 ml of saline for group B. The CFU ml-1 of the pre- and two post-operative samplings were recorded. Values were compared by performing ANOVA and FDR for multiple hypothesis testing. Results: No statistically significant difference between initial CFU ml-1 readings was recorded, whereas significant differences between group A and B at both 4% and 8% tapers were noted. Furthermore, a linear-dependent reduction of CFU ml-1 was recorded in each group from non-instrumented root canals to #30/0.04 and subsequently to #30/0.08. The positive control group shows the expected reduction of bacterial count. Conclusion: Chemomechanical instrumentation was more efficient at reducing E. faecalis when the taper of root canals increased from 4% to 8% and NaOCl plus EDTA led to a greater intracanal bacterial reduction than saline, regardless of the taper achieved.

Download Full-text

A Successful Individual Endodontic Treatment of Severely Curved Root Canals in Mandibular Second Molars: A Case Report

10.21203/rs.3.rs-1020310/v1 ◽

2021 ◽

Author(s):

Laijun Xu ◽

jianying zhang ◽

zihua huang ◽

xiangzhu wang

Keyword(s):

Root Canal ◽

Three Dimensional ◽

Complete Healing ◽

Endodontic Treatment ◽

Second Molar ◽

Root Canals ◽

Mandibular Molars ◽

Complex Anatomy ◽

Mandibular Second Molar ◽

Curved Root Canals

Abstract Background and Overview The incidence rate of severely curved root canals in mandibular molars is low, and the root canal treatment of mandibular molars with this aberrant canal anatomy may be visibly and technically challenging. Case Description A 26-year-old Chinese female patient presented with intermittent and occlusal pain in the left mandibular second molar. The patient had undergone caries for filling restoration before endodontic consultation. With the aid of cone beam computed tomography (CBCT), a large periapical radiolucency was observed, and curved root canals in a mandibular second molar were confirmed, depicting a severe and curved distolingual root. Nonsurgical treatments, including novel individual preparation skills and techniques and the use of bioceramic materials as an apical barrier, were performed, and complete healing of the periapical lesion and a satisfactory effect were achieved. Conclusions and Practical implications A case of a severely curved root canal in a mandibular second molar was successfully treated and reported herein. The complex anatomy of the tooth and the postoperative effect were also evaluated via the three-dimensional (3D) reconstruction of CBCT images, which accurately identified the aberrant canal morphology. Furthermore, new devices and biomaterial applications combined with novel synthesis techniques can increase the success rate of intractable endodontic treatment.

Download Full-text

Study the Relationship Between Estrogen Hormone and Calcium in Normal Females Before and After Menopause in Baghdad / Iraq

Al-Kitab Journal for Pure Sciences ◽

10.32441/kjps.v2i1.152 ◽

2018 ◽

Vol 2 (1) ◽

Author(s):

Sameerah Mustafa ◽

Asal Tawfeeq ◽

Hadeel Hasan

Keyword(s):

Oral Contraceptive ◽

Healthy Controls ◽

Serum Samples ◽

Oral Contraceptive Pills ◽

Contraceptive Pills ◽

Menopausal Women ◽

Before And After ◽

Group A ◽

Group B ◽

Age Range

This study involved the collection of (90) samples of women serum which included (30) serum samples collected from women before menopause (reproductive women) in the age range of (22-43) years and were considered as (group A- control). While, (group B) included (30) serum samples collected from women using oral contraceptive pills between the ages of (22-43) years old. Whereas, another (30) serum samples were collected from women after menopause between the ages of (43-54) years and were considered as (group C). All of the collected serum samples were subjected to a number of serological and chemical tests for the measurement of (E2, HDL, LDL and Ca). Then, the obtained data were statistical analyzed and results showed a significant decrease (p˂ 0.05) in (E2 ,Ca and HDL) levels in menopausal women compared to that of the normal healthy controls. While, there were non-significant decrease (p> 0.05) in (E2, Ca and HDL) levels in women taking oral contraceptive when compared to the normal healthy controls. On the other hand, a significant increase (p˂ 0.05) was recorded in LDL level in menopausal women compared to that of the normal healthy controls whereas, no-significant increase (p˃ 0.05) in the LDL level in women taking oral contraceptives when compared to the control women.

Download Full-text