The effects of different irrigation agents on root canal dentine micro-hardness and surface roughness

Aim: Successful endodontic treatments rely on sufficient mechanical preparation and irrigation of the root canal followed by an adequate three-dimensional filling. This study investigated the changes in root dentine micro-hardness and surface roughness upon treatment with different irrigating agents. Methodology: A total of 60 human maxillary incisors and canine teeth were used in this study. The crowns of all teeth were decoronated and roots were divided longitudinally. The samples were separated into three groups prior to irrigation. A 5% NaOCl irrigation agent was applied to the first group, a QMix agent was used for the second group, and a 2% CHX agent was used for the third group. All irrigations were performed for 15 minutes. Following irrigation, microstructural and surface-roughness measurements were taken again from all samples. Results: Micro-hardness was not significantly different between QMix or 5% NaOCl (p>0.05). A significant difference was observed between the QMix- and 2% CHX-treated groups, and between the 5% NaOCl- and QMix-treated groups (p<0.05). A significant difference in surface roughness was observed between the QMix and 2% CHX, and between the 5% NaOCl and QMix (p<0.05). No difference in surface roughness was observed between 5% NaOCl or 2% CHX. The 5% NaOCl and QMix agents reduced the dentine micro-hardness equal to or more than that of the 2% CHX agent. The QMix agent also increased the dentine surface roughness significantly more than the other agents. The 5% NaOCl and 2% CHX agents increased surface roughness equally. Conclusions: It was seen that all of the irrigation agents used in our study affected dentin microhardness and surface roughness at different rates. How to cite this article: Öztekin F, Adıgüzel Ö. The effects of different irrigation agents on root canal dentine micro-hardness and surface roughness. Int Dent Res 2019;9(1):16-21. Linguistic Revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.

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Investigation of the effects of different chelating solutions on the microhardness and surface roughness of root canal dentin

International Dental Research ◽

10.5577/intdentres.2019.vol9.no1.4 ◽

2019 ◽

Vol 9 (1) ◽

pp. 22-29

Author(s):

Celalettin Topbaş ◽

Özkan Adıgüzel ◽

Özlem Çölgeçen

Keyword(s):

Surface Roughness ◽

Root Canal ◽

Ethylenediaminetetraacetic Acid ◽

Micro Hardness ◽

Dentin Surface ◽

Significant Difference ◽

Diamond Saw ◽

The Difference ◽

Root Canal Dentin ◽

Roughness Measurements

Introduction: The purpose of this study is to examine the effect of different chelating solutions on microhardness and surface roughness of root canal dentin. Methodology: The crowns of sixty recently extracted maxillary central incisors were separated by diamond burs from the cemento-enamel junction. Roots are divided longitudinally into two pieces with diamond saw. The obtained samples were embedded in autopolymeric-acrylic and the dentin-surfaces of the teeth were grounded. Micro-hardness and surface-roughness measurements were carried out before the chelating processes. First group, the specimens were treated with gel-formed 17% Ethylenediaminetetraacetic acid [EDTA] (JE), second group, specimens were treated with 17% Liquid-formed EDTA (LE), third group, specimens were treated with 20% Citric acid (CA), and the last group specimens were treated with 7% Maleic acid (MA) for 120 seconds. After application of the chelating agents, micro-hardness and surface-roughness measurements of all samples were performed again. The difference between the initial and final measurements was calculated and statistically analyzed. One Way Analysis of Variance ANOVA was used for statistical-analysis and statistically significant difference was observed between the groups (p <0.05). Results: According to the test results, the microhardness of LE was statistically equal to that of JE and caused the least decrease in micro-hardness, SA decreased micro-hardness more than LE and JE, and MA decreased dentin micro-hardness more than all other solutions. And surface-roughness results are: MA increased surface-roughness more than other groups, SA and JE less roughened the dentin surface than MA, and there was no significant difference between the two solutions, LE caused less increase in dentin surface roughness compared to all solutions. Conclusions: Besides the use of EDTA and SA, the clinical use of MA can be considered, and it should also be noted that EDTA differs in terms of surface roughness between liquid and gel forms. How to cite this article: Topbaş C, Adıgüzel Ö, Çölgeçen Ö. Investigation of the effects of different chelating solutions on the microhardness and surface roughness of root canal dentin. Int Dent Res 2019;9(1):22-9. Linguistic Revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.

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Examination of root canal morphology of teeth affected by Molar Incisor Hypomineralization (MIH): Frequency of accessory canals

International Dental Research ◽

10.5577/intdentres.2021.vol11.no1.3 ◽

2021 ◽

Vol 11 (1) ◽

pp. 12-15

Author(s):

Can Özükoç

Keyword(s):

Root Canal ◽

Native Speakers ◽

Microcomputed Tomography ◽

3D Image ◽

Molar Incisor Hypomineralization ◽

Significant Difference ◽

Molar Teeth ◽

Native Speakers Of English ◽

Root Canal Morphology ◽

Canal Morphology

Aim: The aim of this study was to investigate the incidence of the presence of accessory canals in the root canal of the maxillary first molar teeth affected by Molar Incisor Hypomineralization (MIH).Methodology: A total of 12 maxillary first molar teeth affected by MIH were obtained from 10 children aged from 10 to 12 years. The frequency of the presence of accessory canals was examined by using microcomputed tomography and 3D image software. Results: Accessory canals were observed in the mesiobuccal (MB) canal in all of the samples with a statistically significant difference.(p<0.05) It was observed that the accessory canals were mostly in communication with the canals in the MB root and that furcal accessory canals were found in 10 (83.33%) teeth. The incidence of accessory canals was 75% in the distobuccal (DB) canal and it was 66.66% in the palatal (P) canal.Conclusion: The incidence of the presence of accessory canals in DB and P canals and furcation is higher in the teeth affected by MIH. How to cite this article: Özükoç C. Examination of root canal morphology of teeth affected by Molar Incisor Hypomineralization (MIH): Frequency of accessory canals. Int Dent Res 2021;11(1):12-5. https://doi.org/10.5577/intdentres.2021.vol11.no1.3 Linguistic Revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.

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Evaluation of the effectiveness of reciprocal and conventional shaping systems and EDDY and CanalBrush activation systems in calcium hydroxide removal

International Dental Research ◽

10.5577/intdentres.2021.vol11.no1.4 ◽

2021 ◽

Vol 11 (1) ◽

pp. 16-22

Author(s):

Neslihan Büşra Keskin ◽

Selen İnce Yusufoğlu

Keyword(s):

Statistical Analysis ◽

Calcium Hydroxide ◽

Root Canal ◽

Native Speakers ◽

T Test ◽

Operating Microscope ◽

Root Canals ◽

Significant Difference ◽

Native Speakers Of English ◽

Calcium Hydroxide Removal

Aim: To compare the effectiveness of two preparation systems and two irrigation techniques in calcium hydroxide removal from straight root canals. Methodology: Forty-four mandibular premolar teeth were included in this study. The teeth were filled with a calcium hydroxide-based paste and randomly divided into two different preparation groups (Reciproc 50 (R50; VDW, Munich, Germany and ProTaper Universal F5 (PTU; Dentsply Maillefer, Ballaigues, Switzerland). Subsequently, the groups were divided into two subgroups and irrigated using EDDY (VDW, Munich, Germany) and CanalBrush (CB; Roeko, Langenau, Germany) irrigation activation systems. The percentage of calcium hydroxide removed from the canal walls was analyzed using a dental operating microscope (DOM) at 25× magnification. An independent samples t-test, a Mann–Whitney U, Wilcoxon’s tests were used for statistical analysis. Results: There was no significant difference in calcium hydroxide removal throughout the root canal using the R50 and PTU F5 preparation systems (P = 0.847). Both activation systems significantly increased the amount of calcium hydroxide removed from the root canal. Conclusions: EDDY and CB significantly improved calcium hydroxide removal. There was no significant difference between the R50 and PTU F5 systems in calcium hydroxide removal. How to cite this article: Keskin NB, İnce Yusufoğlu S. Evaluation of the effectiveness of reciprocal and conventional shaping systems and EDDY and CanalBrush activation systems in calcium hydroxide removal. Int Dent Res 2021;11(1):16-22. https://doi.org/10.5577/intdentres.2021.vol11.no1.4 Linguistic Revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.

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Dimensional Accuracy of Dental Models for Three-Unit Prostheses Fabricated by Various 3D Printing Technologies

Materials ◽

10.3390/ma14061550 ◽

2021 ◽

Vol 14 (6) ◽

pp. 1550

Author(s):

Soo-Yeon Yoo ◽

Seong-Kyun Kim ◽

Seong-Joo Heo ◽

Jai-Young Koak ◽

Joung-Gyu Kim

Keyword(s):

Surface Roughness ◽

Three Dimensional ◽

Dimensional Accuracy ◽

3D Analysis ◽

Digital Light Processing ◽

Test Models ◽

Reference File ◽

Significant Difference ◽

Jet Printing ◽

3D Printed

Previous studies on accuracy of three-dimensional (3D) printed model focused on full arch measurements at few points. The aim of this study was to examine the dimensional accuracy of 3D-printed models which were teeth-prepped for three-unit fixed prostheses, especially at margin and proximal contact areas. The prepped dental model was scanned with a desktop scanner. Using this reference file, test models were fabricated by digital light processing (DLP), Multi-Jet printing (MJP), and stereo-lithography apparatus (SLA) techniques. We calculated the accuracy (trueness and precision) of 3D-printed models on 3D planes, and deviations of each measured points at buccolingual and mesiodistal planes. We also analyzed the surface roughness of resin printed models. For overall 3D analysis, MJP showed significantly higher accuracy (trueness) than DLP and SLA techniques; however, there was not any statistically significant difference on precision. For deviations on margins of molar tooth and distance to proximal contact, MJP showed significantly accurate results; however, for a premolar tooth, there was no significant difference between the groups. 3D color maps of printed models showed contraction buccolingually, and surface roughness of the models fabricated by MJP technique was observed as the lowest. The accuracy of the 3D-printed resin models by DLP, MJP, and SLA techniques showed a clinically acceptable range to use as a working model for manufacturing dental prostheses

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Treatment of anatomic canal variations in premolar teeth: Five case reports

International Dental Research ◽

10.5577/intdentres.2021.vol11.suppl1.41 ◽

2021 ◽

Vol 11 (Suppl. 1) ◽

pp. 279-284

Author(s):

Emre Bodrumlu ◽

Esma Dinger

Keyword(s):

Root Canal ◽

Native Speakers ◽

Case Reports ◽

Anatomical Variations ◽

Root Canal Treatment ◽

Root Canals ◽

Treatment Indications ◽

Native Speakers Of English ◽

Root Canal Morphology ◽

Root Canal Instrumentation

Aim: The aim of this case report is to present a series of anatomical variations and endodontic treatments in four two-canal mandibular premolar teeth and three rooted three-canal maxillary second premolar teeth with root canal treatment indications identified via clinical and radiographic examinations. The success of root canal treatment is achieved with a thoroughly examined root canal morphology that has been accurately determined radiographically and clinically before adequate shaping, irrigation, and hermetic filling procedures. Root canals that are not found or not adequately disinfected can cause root canal treatment failure and complications, such as pain, swelling, or persistent fistula, also known as flare-up, after treatment. Canal variations in the teeth were detected via periapical radiographs during the root canal instrumentation stage. Methodology: The endodontic treatments of four two-canal mandibular premolar teeth and one triple-rooted three-canal maxillary second premolar with root canal treatment indications were described. Conclusion: To achieve full success in root canal treatment, anatomical variations should be examined in detail before and during treatment, and treatment should be completed with appropriate techniques. How to cite this article: Dinger E, Bodrumlu E. Treatment of anatomic canal variations in premolar teeth: Five case reports. Int Dent Res 2021;11(Suppl.1):279-84. https://doi.org/10.5577/intdentres.2021.vol11.suppl1.41 Linguistic Revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.

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Communication Strategies Used by Iranian EFL Learners and English Native Speakers: Gender in Focus

International Journal of EFL ◽

10.21462/ijefl.v2i1.15 ◽

2017 ◽

Vol 2 (1) ◽

Author(s):

Layla Hajiesmaeli ◽

Laya Heidari Darani

Keyword(s):

Language Proficiency ◽

Native Speakers ◽

Communication Strategies ◽

Numerical Data ◽

Communication Strategy ◽

Male And Female ◽

Efl Learners ◽

Significant Difference ◽

Native Speakers Of English ◽

The Difference

<p>This article was intended to explore the frequency and order of communication strategies used by Iranian male and female EFL earners as well as English native speakers while facing communication breakdowns. Furthermore, it was aimed to investigate the difference between native speakers and non-native speakers of English in their use of communication strategies. In addition, it was probed whether gender had any effects on the use of these strategies among native and non-native speakers. To this end, the data were collected through the communication strategy questionnaire distributed among 30 male and female Iranian intermediate EFL learners and 15 English native speakers. The design of this study was a quantitative one in which the questionnaire and thus numerical data were applied. To analyze the data, Cronbach alpha and independent-samples t-tests were used. The results indicated that non-verbal and social affective strategies were the most frequent strategies used by non-native speakers and native speakers of English, respectively. Furthermore, there was no significant difference between male and female Iranian EFL learners, but a significant difference between male and female English native speakers were seen. It can be concluded that language proficiency can contribute to the type and frequency of communications strategies which are used non-native speakers; likewise, it can play a significant role in gender differences in language use.<em></em></p>

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Endodontic Irrigation Solutions: A Review

International Dental Research ◽

10.5577/intdentres.2017.vol7.no3.2 ◽

2017 ◽

Vol 7 (3) ◽

pp. 54 ◽

Cited By ~ 2

Author(s):

Celalettin Topbas ◽

Ozkan Adiguzel

Keyword(s):

Root Canal ◽

Native Speakers ◽

Antimicrobial Properties ◽

Canal System ◽

Root Canals ◽

Native Speakers Of English ◽

Root Canal System ◽

Dentin Tubules ◽

Endodontic Irrigation ◽

Organic Tissue

The goal of endodontic treatment is to remove all the vital and necrotic tissues, microorganisms and microbial byproducts from root canal system. This goal can be achieved through chemical and mechanical debridement of root canals. This article narrates the specifics and requirements of the irrigation solutions. Sodium hypochlorite is proposed as the primary irrigant by virtue of its organic tissue dissolution capacity and broad antimicrobial properties. On the other hand, chelation solutions are recommended as auxiliary solutions to remove the smear layer or to hinder its formation on dentin surface. Thus, it's hoped that sealers and root canal fillers can penetrate to dentin tubules and obturate the canals hermetically. There are new studies on traditional irrigants especially on some irrigants that can replace sodium hypoclorite. This article reviews the new irrigants which can be used in future endodontic practice, and their advantages and limitations. Moreover, actions and interactions of recently used irrigants are adverted. How to cite this article: Topbas C, Adiguzel O. Endodontic Irrigation Solutions: A Review. Int Dent Res 2017;7:54-61. Linguistic Revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.

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Three-dimensional laparoscopic partial nephrectomy for renal hilar tumors: an empirical analysis of 290 patients

10.21203/rs.3.rs-26361/v1 ◽

2020 ◽

Author(s):

Feiya Yang ◽

Lianjie Mou ◽

Nianzeng Xing

Keyword(s):

Partial Nephrectomy ◽

Preoperative Evaluation ◽

Three Dimensional ◽

Intraoperative Ultrasound ◽

Operation Time ◽

Laparoscopic Partial Nephrectomy ◽

Renal Tumors ◽

Significant Difference ◽

Group A

Abstract Objective To explore the feasibility of laparoscopic partial nephrectomy(LPN) in the treatment of renal hilar tumors. Methods Clinical data of 290 patients undergoing laparoscopic partial nephrectomy from January 2013 to August 2019 were retrospectively analyzed, including 27 patients with renal hilar tumors and 263 patients with non-hilar renal tumors. Perioperative data and follow-up results were compared between the two groups. Results Tumor size in Group A is smaller(2.97±0.88 vs 3.55±1.46,p<0.05), R.E.N.A.L. nephrometry score of Group A is higher(8.4±1.3 vs 6.5±1.7,p<0.01).The operation time, WIT and intraoperative blood loss in the Group A were slightly higher, but with no statistical difference (p>0.05). There was no significant difference between the two groups in intraoperative ultrasound rate, collection system repair rate, drainage time,postoperative hospital stay, and eGFR changes (p>0.05).The median follow-up period was 40 months. One patient with postoperative pathologic report of angiomyolipoma was found tumor recurrence and was currently undergoing regular reexamination. Conclusion Three-dimensional laparoscopic partial nephrectomy for renal hilar tumors is safe and feasible after detailed preoperative evaluation of the tumor and selection of appropriate surgical strategies.

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Thermal-ageing characteristics of dry-type transformer epoxy composite insulation

High Performance Polymers ◽

10.1177/0954008320906439 ◽

2020 ◽

Vol 32 (7) ◽

pp. 741-752

Author(s):

Yongqiang Wang ◽

Changhui Feng ◽

Ruoyu Fei ◽

Yu Luo

Keyword(s):

Surface Roughness ◽

Dielectric Constant ◽

Surface Morphology ◽

Epoxy Resin ◽

Degradation Mechanism ◽

Three Dimensional ◽

Thermal Ageing ◽

Ageing Process ◽

Complex Dielectric Constant ◽

Significant Difference

To study the ageing characteristics of epoxy resin composite insulation in dry-type transformers in high-temperature environments, glass fibre-reinforced epoxy resin samples were placed in a hot air ageing environment at 130°C for testing. Dielectric properties, partial discharge (PD), microscopic morphology, three-dimensional morphology and Fourier transform infrared spectroscopy of aged samples were periodically tested. The results show that during the ageing process, the change in the surface morphology of the sample leads to an overall upward trend in surface roughness, and the older the sample, the faster the surface roughness increases; changes in the surface morphology and three-dimensional morphology of the material constitute the basis for judging the condition of the insulating surface and the state of ageing development. Microcracks are the direct cause of debonding of glass fibres and epoxy matrix. Degradation of the sample during the ageing process generates many free radicals, which enhances the polarisation ability of the sample and increases both the dielectric constant and the dielectric loss factor. The real part of the complex dielectric constant is more sensitive to the ageing response of the sample. The older the sample, the greater the effect on the results of the dielectric spectrum test. Since the aged sample generates more hot electrons during the PD process and makes it easier to inject electrons into the material, the PD of the sample is rendered more intense by thermal ageing. There is a significant difference between the degradation mechanism of the thermal ageing and PD. The samples subjected to PD after thermal ageing produce new groups, and the degradation of the samples is more severe than that caused by thermal ageing, or PD, alone.

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Apical Debris Extrusion by Adaptive Root Canal Instrumentation in Oval Canals: Full-Sequence SAF System vs. the XP-Endo Shaper Plus Sequence

Applied Sciences ◽

10.3390/app10165684 ◽

2020 ◽

Vol 10 (16) ◽

pp. 5684 ◽

Cited By ~ 1

Author(s):

Ajinkya M. Pawar ◽

Bhaggyashri A. Pawar ◽

Anuj Bhardwaj ◽

Alexander Maniangat Luke ◽

Zvi Metzger ◽

...

Keyword(s):

Root Canal ◽

Significance Level ◽

Full Sequence ◽

Apical Extrusion ◽

Significant Difference ◽

Group A ◽

Group B ◽

Stage 1 ◽

Two Stages ◽

Root Canal Instrumentation

Apical extrusion of debris (AED) by the full sequence of the self-adjusting file (SAF) system was compared with that of the XP-endo shaper plus sequence. Sixty permanent mandibular incisors were randomly assigned to two groups (n = 30) for root canal instrumentation: Group A: Stage 1—pre-SAF OS, pre-SAF 1 and pre-SAF 2 files, followed by Stage 2—1.5 mm SAF; and Group B: Stage 1— hand K-file 15/0.02, followed by Stage 2—XP-endo shaper and Stage 3—XP-endo finisher. The AED produced during instrumentation at each stage was collected in pre-weighed Eppendorf tubes. The weights of AED by the two methods were compared using t tests with significance level set at 5%. Group A produced significantly less total AED than Group B (p < 0.001), with no significant difference in debris extrusion between the two stages (p = 0.3014). Conversely, in Group B, a significant difference was noted between Stage 1 and Stages 2 and 3 (p < 0.01), with no significant difference between Stages 2 and 3 (p = 0.488). Both sequences resulted in measurable amounts of AED. Each phase, in either procedure, made its own contribution to the extrusion of debris.

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