Alloys for endodontic files and hand instruments

Rokaya, Dinesh; Srimaneepong, Viritpon; Hiran-us, Sirawut; Khurshid, Zohaib

doi:10.1016/b978-0-12-821746-7.00006-1

Cited by 3 publications

(2 citation statements)

References 122 publications

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“…Several investigators emphasized the importance of root canal irrigant having a characteristic of eliminating smear layer with most importantly carrying antibacterial properties that will probably leads to successful treatment outcome. [25][26][27] Although the conventional irrigants displayed effective approach in fulfilling their task but with some harmful effects that has been addressed so in this context several investigators examine various herbal extracts with varying concentrations in quest to find better solution for above mentioned problem. In this regard the herbal extracts found to be promising candidate for further investigation.…”

Section: Discussionmentioning

confidence: 99%

RETRACTED: Comparative evaluation of Sapindus Mukorossi extract with 17% EDTA on smear layer removal in various parts of the tooth root

Farooq

Bilgrami

Faraz

et al. 2023

Journal of Applied Biomaterials & Functional Materials

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Objectives: This study aimed to compare the effectiveness of an experimental root canal irrigant and 17% Ethylene-di-amine tetra acetic acid for removal of the smear layer in the coronal, middle and apical portions of the root canal. Materials and methods: Ninety human single rooted maxillary and mandibular teeth were selected for this study. The teeth were randomly divided into two experimental groups and one control group as follows: Group A (Ethanolic extract of Sapindus Mukorossi), Group B (17% EDTA), and Group C (Distilled water). The root canals of all three groups were prepared with stainless steel K-files by means of the standard step-back technique and irrigated with 5.25% sodium hypo chloride. The teeth were decoronated, following the irrigation and divided longitudinally into two-halves and visualized using scanning electron microscope (SEM) for the amount of smear layer present utilizing the three-point score system. The observations were noted both before and after the treatment. Nonparametric tests were applied for the comparison and p-value ⩽ 0.05 was considered as statistically significant. Results: It was evident from that smear layer was completely removed in coronal portion of 27 out of 30 teeth in-group A. For middle and apical areas of group A, 24 and 19 teeth showed complete smear layer removal. In-group B it was found that there were 24, 21, and 3 teeth at coronal, middle and apical, areas respectively where smear layer were completely absent. Intra group comparison showed a significant difference ( p = 0.002) in smear layer removal was found for group A at coronal, middle and apical thirds. Similarly, a significant difference ( p = 0.001) was also found for group B; however heavy smear layer was found among the three parts of the canal for group C. Conclusions: Ethanolic extract of Sapindus Mukorossi have higher effectiveness in removing the smear layer from the root canal in comparison to 17% EDTA.

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Section: Discussionmentioning

confidence: 99%

RETRACTED: Comparative evaluation of Sapindus Mukorossi extract with 17% EDTA on smear layer removal in various parts of the tooth root

Farooq

Bilgrami

Faraz

et al. 2023

Journal of Applied Biomaterials & Functional Materials

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“…Factors that can mainly lead to variations in design include axis taper, cross-sectional shape, radial surface, grooves, helix angle and pitch. Currently, most rotary endodontic instruments are made of NiTi alloy (Rokaya et al, 2022). The NiTi alloy is indeed the alloy of choice and marked the beginning of modern Endodontics having produced a true technological revolution in the eld (Walia et al, 1988).…”

Section: Introductionmentioning

confidence: 99%

Finite Element Design Optimization by Doe Technique of the Torsional Stress Behavior for Niti Rotary Endodontic Instruments

Russo,

Gisario,

Zanza

et al. 2024

Preprint

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Nickel-Titanium (NiTi ) rotary endodontic instruments are fundamental in modern dentistry, as the greater mechanical properties and flexibility make the treatment of the root canal faster and more effective. The present study deals with an analysis of the mechanical behaviour of the NiTi endodontic instruments during the application of torsional stresses, through a finite element simulation model. The model simulates the interaction of rotary endodontic instruments within a curved conical canal, focusing on the impact of various geometric parameters. Key factors such as the cross-section, the pitch and the taper have been analysed to discern their influence on the mechanical performance of the instrument. Subsequently, a topological optimization was made to customize the design in order to improve the performance’s instrument under torsional stress. The investigation revealed a significant correlation between the polar moment of inertia of the resistant section and the stifness of the instrument. Through the variation of taper and pitch, individually or in combination, it was possible to identify ranges of parameter values for the definition of more flexible or more rigid behaviour. In particular, it was observed that lower taper increases the flexibility of the instrument, while a higher pitch increases flexibility.

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A Novel Design for Full-coverage Crown to Assist for Future Endodontic Treatment: A Survey on Difficulties of Access Cavity through Crowns and Pilot In-vitro Study Testing the New Design

Mashyakhy,

Adawi,

Abu-Melha

et al. 2024

TODENTJ

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Aim Many challenges are faced during opening cavity access through crowns. This study aimed to present a novel design for a full-coverage crown to overcome the difficulties of opening endodontic access and to facilitate root canal treatment. Methodology This study comprised two parts: (I) the survey, a cross-sectional questionnaire-based survey was conducted among dentists to assess the degree and type of challenges, complications and difficulties of opening the endodontic access cavity through zirconia and porcelain-fused-to-metal (PFM) crowns, and (II) the experiment, a novel crown design that include a mark occlusally as a guide to access precisely into the pulp chamber was fabricated by taking cone-beam computed tomography scans along with digital impressions of teeth prepared to receive zirconia crowns. The scans were merged with the digital impressions to detect the exact location of the pulp chamber and to make a guide on the crown over the pulp. Subsequently, the crowns were cut using a computer-aided design/computer-aided milling machine. Twenty-one samples in three equal groups (control 1, natural teeth; control 2, full zirconia crowns; and the experimental group, the novel design) were accessed by one operator. The following criteria were evaluated: time spent, quality, and size of the access cavity. The data were collected and analyzed using the SPSS software program at a significance level of P-value < 0.05. Results In total, 440 dentists from 28 countries participated in this survey. Generally, the participants reported moderate and difficult degrees of opening through crowns. The most reported challenges and complications were the time spent in the opening and the fracture or chipping of the crown material. For the experiment, no significant difference was found among the groups in relation to the time spent for opening (P = 0.57), with the least required time of access for the experimental group. In addition, no significant difference was found in the quality and size of the access cavity (P = 0.775) among the groups. Conclusion Endodontic cavity access through zirconia and PFM crowns is difficult and time-consuming. The novel proposed design utilizing digital dental technology can overcome these issues by preserving the crown, decreasing chair time, and providing less complicated treatment.

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Alloys for endodontic files and hand instruments

Cited by 3 publications

References 122 publications

RETRACTED: Comparative evaluation of Sapindus Mukorossi extract with 17% EDTA on smear layer removal in various parts of the tooth root

RETRACTED: Comparative evaluation of Sapindus Mukorossi extract with 17% EDTA on smear layer removal in various parts of the tooth root

Finite Element Design Optimization by Doe Technique of the Torsional Stress Behavior for Niti Rotary Endodontic Instruments

A Novel Design for Full-coverage Crown to Assist for Future Endodontic Treatment: A Survey on Difficulties of Access Cavity through Crowns and Pilot In-vitro Study Testing the New Design

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