INFLUENCE OF SPEED ON MICROCRACKS IN ROOT DENTIN DURING ROOT CANAL PREPARATION WITH TWO ROTARY SYSTEM-PROTAPER UNIVERSAL AND REVO-S.

Background. Pediatric endodontics is a field with constant evolution, resulting in the shifting of paradigms from the use of conventional hand files to rotary files for biomechanical preparation in primary teeth. Biomechanical preparation plays a crucial role in the success of root canal treatment. Primary teeth need special attention since they differ from permanent teeth in root canal morphology. Cleaning and shaping of the canals damage the root dentin, leading to dentinal cracks. Newer techniques for root canal preparation, including Ni-Ti rotary files and SAF system, have been developed for use in pediatric endodontics to overcome the drawbacks of conventional methods. The present study compared dentinal defects formed by rotary systems in primary teeth. Methods. Eighty primary teeth were included. The teeth were decoronated with a diamond disc. All the roots were inspected for any pre-existing cracks or craze lines under transmitted light under a stereomicroscope. The specimens were then divided into four groups (n=20): group 1: control, group 2: hand files (HF), group 3: ProTaper files, and group IV: SAF files. The samples were instrumented according to the group they were assigned to. Results. The HF and SAF groups exhibited fewer microcracks. Dentinal microcracks were observed in roots prepared with rotary ProTaper files. There were significant differences between HF/SAF and rotary files (P<0.05). Conclusion. Stainless steel hand K-files and SAF instruments resulted in fewer dentinal damage than the ProTaper Universal files. SAF exhibited satisfactory results with minimal or no crack formation.

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

Dental Journal of Advance Studies ◽

10.1055/s-0038-1676917 ◽

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.

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Evaluation of Effect of Hyflex EDM on Root Dentin during Root Canal Preparation-A Stereomicroscopic Study

International Journal of Medical and Dental Sciences ◽

10.18311/ijmds/2017/18844 ◽

2017 ◽

Vol 6 (2) ◽

pp. 1525

Author(s):

Dakshata Dinesh Sankhe

Keyword(s):

Root Canal ◽

Root Canal Preparation ◽

Rotary Instruments ◽

Root Dentin ◽

Root Fractures ◽

Group 2 ◽

Long Term Prognosis ◽

Level Of Significance ◽

Group 1

Background: Root canal preparations done using many rotary endodontic instruments results in formation of root dentin defects because of the stress induced by the instruments within the root canal during cleaning and shaping, thereby worsening the long term prognosis of the root canal treated teeth. Many rotary instruments are been globally studied for the purpose of generating a correct instrument for root canal preparation.Objective: This study was done to evaluate the effect of HyFlex EDM, which is a new rotary system on root dentin during root canal preparation.Materials and methods: Fourteen single rooted premolars were selected and divided into two groups, Group 1-Protaper Universal and Group 2-HyFlex EDM. All the specimens were decoronated. Roots of each specimen were sectioned at 3mm, 6mm and 9mm and were then viewed under stereomicroscope for dentinal defects. t-test was done for the statistical analysis and level of significance was set at p=0.05.Results: Protaper Universal showed highest percentage of defect than HyFlex EDM.Conclusion: HyFlex EDM showed lowest percentage of defects in root dentin. Thus, HyFlex EDM is more efficient in root canal preparation than that of Protaper Universal thereby preventing dentinal defects or microcracks leading to root fractures.

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ACCIDENTAL SUBMUCOSAL INJECTION OF A CHEMICAL DISINFECTANT USED IN ROOT CANAL PREPARATION

10.26226/morressier.578e3b4cd462b80292381b6d ◽

2016 ◽

Author(s):

Konstantinos Katoumas

Keyword(s):

Root Canal ◽

Root Canal Preparation ◽

Submucosal Injection ◽

Chemical Disinfectant

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Retrieval of fractured Endodontic Instrument under dental operating microscope using ultrasonic tips : A Case Report

International Journal of Research in Pharmaceutical Sciences ◽

10.26452/ijrps.v11i3.2463 ◽

2020 ◽

Vol 11 (3) ◽

pp. 3316-3321

Author(s):

Samrudhi Khatod ◽

Anuja Ikhar ◽

Pradnya Nikhade ◽

Manoj chandak

Keyword(s):

Case Report ◽

Root Canal ◽

Fracture Resistance ◽

Root Canal Treatment ◽

Operating Microscope ◽

Severe Loss ◽

Mechanical Procedure ◽

Root Dentin ◽

Fracture Level

A Patient came with the complaint of pain in the lower right back region of the jaw. Root canal treatment was planned. While preparing for the bio-mechanical procedure, the Hand pro taper fractured in the apical third. Iatrogenic occurred as a result of the fracture of the endodontic instrument. Retrieval of the fractured instrument was planned to complete the cleaning and shaping of the canal. The removal of the fractured instrument was planned to be done under the Dental Operating Microscope. The use of an operating microscope enhanced the illumination and the magnification of the instrument. This illumination and magnification helped in the precision of removal. The ultrasonic tip enabled to reach of the fractured instrument in the canal and loosen the dentin around the fractured instrument. It allowed easy retrieval of the fractured instrument. During the retrieval procedure, the fractured instrument was bypassed before the use of the ultrasonic tip. After the removal of the fractured instrument, cleaning and shaping were completed, followed by obturation, definitive restoration, and prosthesis. As the removal of the fractured instrument enabled complete cleaning and shaping, it improved the prognosis of the case. When the endodontic instrument gets fractured, it should be analyzed over the radiograph to assess the fracture level, the anatomy of the root canal, size of the fractured instrument, check accessibility, stage of fracture, etc. If all the above criteria are met with the removal of the instrument only then, replacement should be tried. Otherwise, it may lead to a severe loss of root dentin, decreasing fracture resistance of the root.

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Kedo-S Paediatric Rotary Files for Root Canal Preparation in Primary Teeth – Case Report

JOURNAL FOR CLINICAL AND DIAGNOSTIC RESEARCH ◽

10.7860/jcdr/2017/25856.9508 ◽

2017 ◽

Cited By ~ 2

Author(s):

Ganesh Jeevanandan

Keyword(s):

Case Report ◽

Root Canal ◽

Primary Teeth ◽

Root Canal Preparation

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Debunking the Concept of Dentinal Tubule Penetration of Endodontic Sealers: Sealer Staining with Rhodamine B Fluorescent Dye Is an Inadequate Method

Materials ◽

10.3390/ma14123211 ◽

2021 ◽

Vol 14 (12) ◽

pp. 3211

Author(s):

David Donnermeyer ◽

Sina Schmidt ◽

Arno Rohrbach ◽

Johannes Berlandi ◽

Sebastian Bürklein ◽

...

Keyword(s):

Penetration Depth ◽

Rhodamine B ◽

Root Canal ◽

Laser Scanning Microscopy ◽

Confocal Laser ◽

Dentinal Tubule ◽

Dentinal Tubules ◽

Ah Plus ◽

Root Dentin ◽

Rhodamine B Dye

The aim of this study was to investigate the suitability of rhodamine B dye staining of an epoxy resin sealer (AH Plus) and calcium-silicate-based sealers (Total Fill BC Sealer, BioRoot RCS) to represent the penetration depth of the sealers into dentinal tubules after root canal obturation. In a three-step process, (1) leaching of rhodamine B from sealers into a buffer solution, (2) passive penetration of leached rhodamine B into dentinal tubules, and (3) conformity of rhodamine B penetration assessed by confocal laser scanning microscopy (CLSM), and sealer penetration assessed by scanning electron microscopy (SEM), in root-canal-filled teeth, were evaluated. Rhodamine B dye massively leached out of Total Fill BC Sealer and BioRoot RCS into the phosphate-buffered saline (PBS). A pinkish coloration of AH Plus was found after contact with PBS. Leached rhodamine B dye passively penetrated dentinal tubules from all three sealers when placed on root dentin. No correlation was observed between sealer penetration in SEM and rhodamine B penetration in CLSM. Staining of sealers using rhodamine B is an inadequate method with which to evaluate sealer penetration depth into dentinal tubules, as it overestimates the penetration of sealers into root dentin tubules.

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