scholarly journals The Influence of Root Canal Preparation with ProTaper Next, WaveOne Gold, and Twisted Files on Dentine Crack Formation

Machines ◽  
2021 ◽  
Vol 9 (12) ◽  
pp. 332
Author(s):  
Wojciech Eliasz ◽  
Beata Czarnecka ◽  
Anna Surdacka
Keyword(s):  
Root Canal ◽  
Crack Formation ◽  
Study Groups ◽  
Control Group ◽  
Root Canal Preparation ◽  
Low Speed ◽  
Group Post

(1) Background: Root canal preparation constitutes an important factor for success in endodontics. However, various complications may occur during this stage. The aim of this study was to compare the incidence of cracks within radicular dentin after instrumentation with ProTaper Next (PTN), WaveOne Gold (WOG), and Twisted Files (TF), which utilize different kinematics. (2) Methods: Eighty single-rooted teeth were classified into four groups (n = 20). Three groups were instrumented using PTN (X1, X2), WOG (Primary), and TF (SM1–3). The non-instrumented group constituted the control group. Post-preparation, the roots were sectioned 3, 6, and 9 mm from the apex using a low-speed saw (Southbay Technology Inc., San Clemente, CA, USA). The specimens were viewed through a microscope at x25 magnification (Leica M320, Wetzlar, Germany), and their surface was assessed tactilely to determine the presence of the crack. (3) Results: Partial cracks within radicular dentine were observed in all study groups (PTN: n = 4/20%, WOG: n = 3/15%, TF: n = 4/20%); no cracks were observed in the control group. No significant differences were observed among experimental groups. OR values for the incidence of cracks were: OR = 11.182 for PTN, OR = 8.2 for WOG, and OR = 8.2 for TF. (4) Conclusions: Instrumentation with PTN, WOG, and TF may result in dentinal cracks formation.

scholarly journals The Ability of Different Nickel-Titanium Rotary Instruments to Induce Dentinal Micro-cracks during Root Canal Preparation

2018 ◽  
Vol 6 (02/03) ◽  
pp. 071-075
Author(s):  
Jagat Bhushan ◽  
Garima Gupta ◽  
Abhisheik Gupta
Keyword(s):  
Root Canal ◽  
Crack Formation ◽  
Nickel Titanium ◽  
Control Group ◽  
Apical Region ◽  
Root Canal Preparation ◽  
Micro Cracks ◽  
Significant Difference ◽  
Root Dentin ◽  
Root Canal Dentin

Abstract Objective The aim of this study was to investigate the incidence of cracks in root dentin after root canal preparation with SmartTrack files, ProTaper Next files, and HyFlex CM files. Materials and Methods Sixty extracted single-rooted human mandibular premolars with one canal were used for the study. Fifteen teeth were left unprepared and served as control; another 15 were instrumented with SmartTrack files up to 30/0.06, and the remaining 30 were shaped with ProTaper Next till X3 and HyFlex CM files up to 30/0.04. After root canal preparation, all the roots were sectioned perpendicular to the long axis at 2, 4, and 6 mm from the apex, and the sections were then observed under a stereomicroscope. The absence or presence of cracks was recorded. Results No cracks were observed in the control group. There was presence of cracks at all the levels in all the experimental groups. There was a significant difference in crack formation when the groups were compared whereas this difference was not significant when the levels were compared (p > 0.05). In the SmartTrack group, there was crack in 73% samples whereas in HyFlex CM and ProTaper Next, the number of samples with cracks was 27% and 53%, respectively. In the apical region, the number of samples that shows cracks was 29% whereas the number of cracks in the middle and coronal regions was 20%. Conclusion Within the limitations of this study, root canal preparation with rotary nickel-titanium (Ni-Ti) instruments can cause crack formation in root canal dentin. The ProTaper Next and HyFlex instruments have a tendency to cause fewer dentinal cracks compared with the SmartTrack instruments.

Effect of Root Canal Preparation Techniques on Crack Formation in Root Dentin

2019 ◽  
Vol 45 (4) ◽  
pp. 447-452 ◽  
Author(s):  
Yazdan Shantiaee ◽  
Omid Dianat ◽  
Golnaz Mosayebi ◽  
Mahshid Namdari ◽  
Patricia Tordik
Keyword(s):  
Root Canal ◽  
Crack Formation ◽  
Root Canal Preparation ◽  
Root Dentin ◽  
Preparation Techniques

scholarly journals Effect of different periodontal ligament simulating materials on the incidence of dentinal cracks during root canal preparation

2018 ◽  
Vol 12 (3) ◽  
pp. 196-200
Author(s):  
Ajita Rathi ◽  
Prateeksha Chowdhry ◽  
Mamta Kaushik ◽  
Pallavi Reddy ◽  
Roshni Roshni ◽  
...  
Keyword(s):  
Root Canal ◽  
Periodontal Ligament ◽  
Negative Control Group ◽  
Negative Control ◽  
Control Group ◽  
P Value ◽  
Root Canal Preparation ◽  
Impression Material ◽  
Group 1

Background. The present study was undertaken to evaluate the incidence of dentinal cracks during root canal preparation with different periodontal ligament simulating materials in vitro. Methods. Seventy freshly extracted human mandibular first premolars were selected and divided into 7 groups in terms of simulating material: group 1: polyether impression material; group 2: polyvinyl acetate adhesive; group 3: polyvinyl siloxane impression material; group 4: cyanoacrylate adhesive; group 5: epoxy resin adhesive; group 6: positive control, without any periodontal ligament simulation; and group 7: negative control, where neither a periodontal ligament simulating material was used nor canal preparation was carried out. Root canal preparation was carried out in all the groups followed by sectioning of roots at 3 mm, 6 mm and 9 mm. The sections were evaluated under a stereomicroscope at ×2.5 for the presence or absence of cracks. Chi-squared test was used to compare the appearance of defective roots between the different experimental groups. Results. The least number of cracks were found in the negative control group, followed by group 1 where polyether impression material was used for periodontal ligament simulation. The difference was significant with a P-value of 0.002 for coronal sections. Conclusion. Under the limitation of the present study, polyether and polyvinyl siloxane (light body) can both be used for simulation of periodontal ligament.

scholarly journals The Guiding Effect of Digital Image Based on Cone-Beam Computed Tomographic on Oval Root Canal Preparation

2021 ◽  
Author(s):  
Yiwei Wang ◽  
Wenjun Xia ◽  
Zisheng Tang ◽  
Yan Zou ◽  
Xiaohe Bian ◽  
...  
Keyword(s):  
Digital Image ◽  
Root Canal ◽  
Cone Beam ◽  
Control Group ◽  
Root Canal Preparation ◽  
Computed Tomographic ◽  
Significant Difference ◽  
3D Printed ◽  
Experimental Group ◽  
Guiding Effect

Abstract Background: To evaluate the guiding effect of digital image based on cone-beam computed tomographic in improving the quality of single oval root canal preparation.Methods: A premolar was selected by CBCT and a 3D-printed root canal model was made. Twenty postgraduates from the Department of Stomatology of Shanghai Ninth People's Hospital were selected to perform root canal preparation on 3D printed oval root canal model teeth. They were randomly assigned to two groups(n=10) according to the guiding method received: CBCT original image (control group) and CBCT-based digital image (experimental group). CBCT scans were performed on the models before and after the guidance. The changes in root canal cleanliness, residual minimum thickness, transportation and over-preparation amount were analyzed.Results: The experimental group caused significantly more increased amount of cleanliness compared to control group(P<0.05)：6.0373% ±6.0766% in the control group and 13.7193%±6.7102% in the experimental group. There was no significant difference in the reduction of residual minimum wall thickness between the two groups (P>0.05)： 0.0154mm±0.2110mm in the control group and 0.0362±0.0444mm in the experimental group. In the control group, the transportation after second preparation was generally increased (increased 0.0084mm on average). In the experimental group, the transportation was generally reduced after second preparation (reduced 0.0081mm on average). But there was no significant difference in the transportation change between the two groups (P>0.05). After the second preparation, there was no significant difference in the amount of increased over-preparation between the two groups（P＞0.05）: 1.7029%±3.6622% in the control group and 3.5144%±4.8075% in the experimental group.Conclusions: Compared with traditional CBCT image guidance, the digital image method can significantly improve the cleaning effect of the oval root canal preparation. It didn’t result in more over-preparation and the amount of residual wall thickness was ensured. At the same time, it has a certain effect on reducing transportation after the guidance.

scholarly journals The influence of working length on the reduction of biofilm and planktonic bacteria in oval canals with reciprocating instrumentation

2021 ◽  
Vol 10 (5) ◽  
pp. e9810514765
Author(s):  
Arieth Cristina Sacomani ◽  
Fernanda Tessaro Cintra ◽  
Adriana de Jesus Soares ◽  
Marcos Frozoni
Keyword(s):  
Bacterial Growth ◽  
Root Canal ◽  
Negative Control ◽  
Bacterial Biofilm ◽  
Control Group ◽  
Root Canal Preparation ◽  
Root Canals ◽  
Planktonic Bacteria ◽  
Working Length ◽  
Significant Difference

To evaluate the influence of reciprocating single-file instrumentation with different working lengths (WL) on the reduction of planktonic bacteria and bacterial biofilm in Enterococcus faecalis-contaminated oval root canals. Methodology: Fifty-five human single-rooted canines were used. Fifty were inoculated with E. faecalis for 21 days for biofilm formation. To confirm the formation of biofilm adhered to the root canal wall, 5 contaminated samples from positive control group were analyzed by SEM. Samples were assigned into 3 groups (n = 15) according to working length determined, G+1 root canal preparation 1 mm beyond the apical foramen, G0 root canal preparation at the major foramen, and G-1 root canal preparation 1 mm short of the major foramen. Five roots were not inoculated to serve as a negative control. Bacteriological samples were collected prior to preparation, initial collection (S1), and after reciprocating instrumentation (S2) by disaggregating biofilm to quantify the reduction of planktonic bacteria and intracanal biofilm at different WL. Bacterial quantitation was performed using colony-forming units per milliliter (CFU / mL) count. Statistical analysis was performed at the significance level of 0.05. Results: No bacterial growth was observed in the negative control. All positive controls demonstrated bacterial growth; S1 from all teeth were positive for bacteria with no significant difference. The post-hoc analysis showed G+1 promoting a significantly higher disinfection than G-1 (p<0,05) and G-1 similar disinfection to G0 (P=962). Conclusion: Instrumentation as close as possible to major foramen or beyond it improves decontamination in oval root canals with reciprocating instrumentation.

scholarly journals On the Causality Between Dentinal Defects and Root Canal Preparation: A Micro-CT Assessment

2016 ◽  
Vol 27 (6) ◽  
pp. 664-669 ◽  
Author(s):  
Gustavo De-Deus ◽  
Felipe Gonçalves Belladonna ◽  
Juliana Roter Marins ◽  
Emmanuel João Nogueira Leal Silva ◽  
Aline de Almeida Neves ◽  
...  
Keyword(s):  
Cross Section ◽  
Root Canal ◽  
Optical Microscope ◽  
Control Group ◽  
Micro Ct ◽  
Micro Computed Tomography ◽  
Root Canal Preparation ◽  
Micro Cracks ◽  
Before And After ◽  
Experimental Group

Abstract This study aimed to evaluate the cause-effect relationship between canal preparation with ProTaper Universal (PTU) system and dentinal defects formation using micro-computed tomography (micro-CT) analysis. Forty mesial canals of mandibular molars with a type II Vertucci's canal configuration were scanned at an isotropic resolution of 14.16 µm. The sample was assigned to an experimental (n = 30) and a control (n = 10) groups, and the mesial canals were prepared with PTU system up to F2 instrument. The specimens from the experimental group were scanned and the cross-section images of the mesial roots, before and after preparation, were screened to identify the presence of dentinal defects. In the control group, the specimens were sectioned perpendicularly to the long axis of the root into 1-mm-thick slices (n = 80) and examined under optical microscope. Once a dentinal defect was detected, the slice was scanned through micro-CT. In the experimental group, dentinal micro-cracks were observed in 4,828 slices (24.04%). In all cross-section images, dentinal defects identified in the postoperative images were already present in the corresponding preoperative image. In the control group, 13 out of 80 slices (16.25%) had at least one dentinal defect visualized under stereomicroscopy, which was identified after a further micro-CT scanning. Micro-CT showed reliability as similar as optical microscopy in detecting dentinal defects, adding the possibility of tracking the dentinal tissue, before and after canal preparation, and providing a clear visualization of micro-cracks. Root canal preparation with PTU system did not induce the formation of new dentinal defects.

scholarly journals Effect of rotary systems and root canal preparation and dentin crack formation

2021 ◽  
Vol 8 (11) ◽  
pp. 5578
Author(s):  
Abdulkader Abdulelah Abulhamayel ◽  
Hamdi Abdullah Altukhays ◽  
Hatim Abdullah Alamri ◽  
Abdulrahman Ahmad Salem ◽  
Jummar Ammar Farrash ◽  
...  
Keyword(s):  
Clinical Practice ◽  
Literature Review ◽  
Root Canal ◽  
Crack Formation ◽  
Endodontic Treatment ◽  
Current Evidence ◽  
Root Canal Preparation ◽  
Critical Step ◽  
Root Canals ◽  
Root Fractures

Evidence indicates that root canal preparation is a critical step upon which the prognosis of the endodontic treatment depends. Vertical root fractures can furtherly develop as propagations from the previously formed dentin cracks. Therefore, root canal preparation should be carefully approached with the minimal crack formation and careful dentin removal. Different modalities have been proposed in the literature and rotary systems are most commonly used nowadays. Although the reported efficacy of these modalities is high, evidence shows that they are usually associated with a considerable risk of crack formation. In the present literature review, we have discussed the effects of rotary instrumentation and root canal preparation on dentinal crack formation based on evidence from the different studies in the literature. Our evidence showed that all of the investigated approaches to prepare root canals adequately can result in crack formation. The different rotary instrumentations also showed variable frequencies of developing dentinal cracks, and evidence from some comparative investigations shows that ProTaper modalities are associated with the least frequencies of the events. However, to make a solid conclusion for clinical practice, further research is still needed to validate our current evidence.

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