scholarly journals Comparison of the accuracy of different electronic apex locators used in working length determination via changing of initial cleaning solutions

2021 ◽  
Vol 11 (Suppl. 1) ◽  
pp. 56-62
Author(s):  
Güliz Rana Tellioğlu Avcı ◽  
Sadullah Kaya
Keyword(s):  
Root Resorption ◽  
Native Speakers ◽  
Distilled Water ◽  
Actual Measurement ◽  
Actual Length ◽  
Working Length ◽  
Edta Solution ◽  
Native Speakers Of English ◽  
Length Determination ◽  
The Difference

Aim: The aim of this study is to compare the accuracy of the Root ZX Mini, Raypex 6, E-Pex Pro, and Propex Pixi electronic apex locators by changing the initial cleaning solutions (NaOCl vs.  EDTA). Methodology: Eighty mandibular premolar teeth were used. Radiographs were obtained from the mesio-distal and bucco-lingual angles for all teeth, and teeth with suspected external or internal root resorption and/or calcified canals were not included in the study. The true canal lengths of the teeth were determined with a precision of 0.01 mm with a stereomicroscope at x5 magnification by placing a #20 K-type canal file into the root canal. The samples were then embedded in freshly mixed alginate blocks up to the cemento-enamel junction. The coronal 1/3 was pre-enlarged with a Protaper SX instrument. Electronic apex finders (Root ZX Mini, Raypex 6, E-Pex Pro, Propex Pixi) specified on each tooth were used, and measurements were made by changing the initial solutions (NaOCl vs. EDTA). Distilled water was used between application of 5.25% NaOCl and 17% EDTA to prevent chemical interactions. Three measurements were taken for each tooth, and the average of these 3 measurements was taken as reference. The data obtained in this study were analyzed. Results: There were no statistically significant differences between the solutions in terms of the measurement values and actual length values found by each device (p>0.05). Although there were no statistically significant differences, the deviation from the actual measurement was greater when EDTA solution was used than when NaOCl solution was used. In addition, although the difference was not found to be statistically significant, the deviation from the actual measurement was found to be highest when the Root ZX mini device was used with NaOCl and EDTA solution. Conclusion: The results of this study showed that the difference in the initial washing solutions did not affect the EAL devices in making measurements close to the true length.   How to cite this article: Tellioğlu Avcı GR, Kaya S Comparison of the accuracy of different electronic apex locators used in working length determination via changing of initial cleaning solutions. Int Dent Res 2021;11(Suppl.1):56-62. https://doi.org/10.5577/intdentres.2021.vol11.suppl1.9   Linguistic Revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.  

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

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>

scholarly journals A Comparative Evaluation of Effects of Conventional and Herbal Irrigants on Working Length Determination by Third Generation Apex Locator–An In Vitro Study

2020 ◽  
Vol 8 (02) ◽  
pp. 44-48
Author(s):  
Niharika Patalbansi ◽  
Yogesh Kumar ◽  
Neetu Jindal ◽  
Renu Aggarwal ◽  
Shefali Goyal
Keyword(s):  
Green Tea ◽  
Aloe Vera ◽  
In Vitro Study ◽  
Length Estimation ◽  
Working Length ◽  
Dry Conditions ◽  
Recorded Data ◽  
Length Determination ◽  
The Difference

Abstract Introduction The establishment of accurate working length is one of the most critical steps in endodontic therapy from the biomechanical and obturation points of view. Traditionally, the use of radiography and tactile sense methods were used for working length estimation, but recently, the use of electronic apex locator (EAL) has come into existence. The aim was to evaluate the effect of conventional and herbal irrigants on working length determination by Root ZX. Materials and Methods A total of 110 extracted single rooted teeth were taken. Standard access cavities were prepared and samples were randomly divided into 11 groups (n = 10) according to the type of irrigating solutions used. The actual root canal length was measured, and the readings in dry conditions and wet conditions were recorded. The point where Root ZX showed beep was recorded and difference was recorded as well. The recorded data was calculated and statistically analyzed using unpaired t-test. Result In dry conditions, only saline, H2O2, Aloe vera, and green tea gave exact working length using apex locator values. Whereas in wet conditions, only Aloe vera and green tea gave exact working length. Conclusion Although the irrigants and dry conditions influenced the results, Root ZX can be considered to be accurate, and the difference was within the clinically acceptable range and not statistically significant.

scholarly journals Accuracy of Working Length Measured by Apex Locator and Digital Radiography

2021 ◽  
Vol 30 (1) ◽  
pp. 24-28
Author(s):  
Ghulam Ishaq Khan ◽  
◽  
Muhammad Talha Khan ◽  
Saroosh Ehsan ◽  
Anam Fayyaz ◽  
...  
Keyword(s):  
Digital Radiography ◽  
Root Canal ◽  
Reference Points ◽  
Radiographic Measurement ◽  
Apical Constriction ◽  
Actual Length ◽  
Actual Working ◽  
Working Length ◽  
Length Determination ◽  
Electronic Apex Locator

OBJECTIVE: The objective of this study was to compare the measurements of electronic and radiographic method of working lengths calculation with actual working length of root canals. Precise working length determination is the most important part for successful root canal procedure. The most commonly used methods to determine the working length in root canal treatment are radiography and electronic apex locator. METHODOLOGY: A cross sectional study was done over a period of 06 months in the Department of Operative Dentistry, Fatima Memorial Hospital, Lahore. Sixty patients who were recommended extraction of their premolar teeth with sixty canals were selected by convenience sampling. The Root ZX* apex locator was used to determine electronic working length exactly identifying the apical constriction. Reference points were identified and radiographic working length were determined 1mm short of radiographic apex. The teeth were extracted along with file cemented before extraction inside root canal. The actual length of the root canal was then calculated using the same files and reference point with 3.5X magnification. Pearson chi square test was applied to compare the apex locator and digital radiographic measurement with actual working length. RESULTS: The Root ZX® apex locator was 95% accurate to identify the apical constriction as compared 70% accuracy given by radiographs within 0.5 mm of the apex. CONCLUSION: Electronic apex locator was more accurate as compared to digital radiography in working length determination. KEYWORDS: Working length (WL), Electronic apex locators (EAL), Radiographic working length(RWL), Apical constriction (AC) HOW TO CITE: Khan GI, Khan MT, Ehsan S, Fayyaz A, Malik HA, Hussain S. Accuracy of working length measured by apex locator and digital radiography. J Pak Dent Assoc 2021;30(1):24-28.

Accuracy of an Electronic Apex Locator: A Clinical Evaluation in Primary Molars with and without Resorption

2011 ◽  
Vol 35 (3) ◽  
pp. 255-258 ◽  
Author(s):  
Mesut Enes Odabaş ◽  
Haluk Bodur ◽  
Özlem Tulunoğlu ◽  
Alev Alaç am
Keyword(s):  
Primary Teeth ◽  
Root Resorption ◽  
Statistical Significance ◽  
Healthy Children ◽  
Primary Molar ◽  
Actual Length ◽  
Root Canals ◽  
Working Length ◽  
Microscopic Evaluation ◽  
Electronic Apex Locator

Objective: The aim of this study was to evaluate the accuracy of electronic apex locator (Root ZX) in primary teeth with and without apical root resorption in vivo. Study Design: The electronic working length was determined in 28 primary teeth (A total of 46 primary molar root canals with 24 roots without resorption and 22 roots with resorption) from twenty-eight healthy children using Root ZX. The teeth were then extracted. The actual length of each root was measured placing a K-File until the tip was visible at the apical foramen or the apical resorption level and approved with digital microscopic evaluation under 20× magnification and then withdrawn 1 mm. The distances from the file tip to the base of the rubber stop were measured and compared with the measurement obtained from apex locator. The data were evaluated with t test using standard statistical software (SPSS 13.0). The critical value of statistical significance was 5%. Results: For root canals without resorption, the accuracy of Root ZX was 79.16% and 95.82% within ± 0.5 and ± 1 mm, respectively. For root canals with resorption,the accuracy of Root ZX was 63.63% and 86.35% within ± 0.5 and ± 1 mm, respectively. No statistically significant differences were detect between the electronically determined lengths and the actual lengths regardless of whether or not resorption. Conclusion: Using a Root ZX Electronic Apex Locator in primary teeth with or without resorption is recommended for the determination of working length.

Text-based negotiated interaction of NNS-NNS and NNS-NS dyads on Facebook

ReCALL ◽  
2017 ◽  
Vol 29 (3) ◽  
pp. 294-312 ◽  
Author(s):  
Sarah Hsueh-Jui Liu
Keyword(s):  
Foreign Language ◽  
Native Speakers ◽  
Native English Speakers ◽  
Strategy Use ◽  
English Speakers ◽  
Negotiated Interaction ◽  
Native Speakers Of English ◽  
The Difference ◽  
The Given

AbstractThis study sought to determine the difference in text-based negotiated interaction between non-native speakers of English (NNS-NNS) and between non-native and natives (NNS-NS) in terms of the frequency of negotiated instances, successfully resolved instances, and interactional strategy use when the dyads collaborated on Facebook. It involved 10 native English speakers and 30 learners of English as a foreign language (EFL). NNS-NNS dyads consisted of five H-H pairs and five L-L pairs (H and L representing high- and low-proficiency learners). Similarly, NNS-NS dyads comprised five H-N pairs and five L-N pairs (N being native speakers). All dyads were required to use text chats to complete the given reading tasks synchronously in chatrooms on Facebook. The results suggested that negotiated instances, successfully resolved instances, and interactional strategy use occurred more frequently in H-H pairs than in L-N, L-L, or H-N pairs. In terms of strategy use, H-H, H-N, and L-N dyads were likely to engage in negotiated interaction by employing strategies such as clarifying unclear expressions or checking their comprehension, while L-L used interactional mechanisms infrequently and tended to use strategies such as continuers and asking for assistance. The research concludes with the pedagogical implications of the results.

Processing focus in native and non-native speakers of English: an eye-tracking study in the visual world paradigm

2021 ◽  
pp. 1-32
Author(s):  
Haoyan Ge ◽  
Iris Mulders ◽  
Xin Kang ◽  
Aoju Chen ◽  
Virginia Yip
Keyword(s):  
Eye Movements ◽  
Eye Tracking ◽  
Real Time ◽  
Native Speakers ◽  
Visual World ◽  
Visual World Paradigm ◽  
L2 Processing ◽  
Multiple Interfaces ◽  
Native Speakers Of English ◽  
The Difference

Abstract This “visual-world” eye-tracking study investigated the processing of focus in English sentences with preverbal only by L2 learners whose L1 was either Cantonese or Dutch, compared to native speakers of English. Participants heard only-sentences with prosodic prominence either on the object or on the verb and viewed pictures containing an object-focus alternative and a verb-focus alternative. We found that both L2 groups showed delayed eye movements to the alternative of focus, which was different from the native speakers of English. Moreover, Dutch learners of English were even slower than Cantonese learners of English in directing fixations to the alternative of focus. We interpreted the delayed fixation patterns in both L2 groups as evidence of difficulties in integrating multiple interfaces in real time. Furthermore, the similarity between English and Dutch in the use of prosody to mark focus hindered Dutch learners’ L2 processing of focus, whereas the difference between English and Cantonese in the realization of focus facilitated Cantonese learners’ processing of focus in English.

scholarly journals Comparison of the accuracy of three different electronic apex locators used in root canals enlarged in different apical diameters

2021 ◽  
Vol 11 (Suppl. 1) ◽  
pp. 12-18
Author(s):  
Hasan Öz ◽  
Özkan Adıgüzel ◽  
Sadullah Kaya
Keyword(s):  
Chi Square ◽  
Actual Length ◽  
Exact Test ◽  
Root Canals ◽  
Working Length ◽  
Significant Difference ◽  
Measurement Results ◽  
Electronic Measurement ◽  
Native Speakers Of English ◽  
Level Of Significance

Aim: This study aimed to evaluate the accuracy of three apex locators in enlarged teeth with different apical diameters using files that are compatible and incompatible with the apical diameters. Methodology: Sixty lower premolars were used in this study. The actual canal length was determined with a stereo microscope, and the teeth were divided into three different groups (G25, G40 and G50). The teeth in G25, G40 and G50 were enlarged in actual canal length with apical diameters of 0.25, 0.40 and 0.50 mm using hand files and Reciproc R25, R40, and R50, respectively. In the electronic measurements, a #15 hand file was used in each group, and #25, #40 and #50 hand files that were compatible with the apical diameters of the teeth in the groups were used. An alginate model was created with enlarged teeth. The electronic working length was determined for each tooth using Root ZX Mini, Raypex 6, and Propex Pixi electronic apex locators (EALs). Results: Electronic measurement results that were shorter by 0.50 mm or longer by 0.05 mm than the actual length were considered unsuccessful; otherwise, they were deemed successful. Analysis of variance was used to evaluate the accuracy of the EALs with different files in the same apical diameter. For the different apical diameters, the chi-square exact test was used to evaluate the accuracy effect of using files that were incompatible with each apical diameter. The level of significance was p > 0.05. In all the groups, the measured lengths were closer to the actual canal length with the use of #25, #40 and #50 hand files that were compatible with the apical diameters. However, there was no significant difference between the measurements with the #15 hand file (p > 0.05). According to the electronic measurement results made with the #15 hand file in teeth with 0.25, 0.40 and 0.50 apical diameters, the use of a file that was incompatible with the apical diameter did not have a significant effect on accuracy (p > 0.05). Conclusion: The use of a file that is compatible with the apical diameter of the tooth in the determination of the working length with measurement of EALs close to the actual canal length. The accuracy of EALs is not affected by the file size in electronic measurements with file sizes smaller than the apical diameter in teeth with apical diameters up to 0.50 mm.   How to cite this article: Öz H, Adıgüzel Ö, Kaya S. Comparison of the accuracy of three different electronic apex locators used in root canals enlarged in different apical diameters. Int Dent Res 2021;11(Suppl.1):12-8. https://doi.org/10.5577/intdentres.2021.vol11.suppl1.3   Linguistic Revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.  

scholarly journals Comparative evaluation of the color stability of universal composites

2021 ◽  
Vol 11 (Suppl. 1) ◽  
pp. 234-237
Author(s):  
Merve Gürses ◽  
Nevin Çobanoğlu ◽  
Omar Faez Abdulateef
Keyword(s):  
Comparative Evaluation ◽  
Color Change ◽  
Native Speakers ◽  
Color Stability ◽  
Composite Resins ◽  
Control Group ◽  
Distilled Water ◽  
Color Changes ◽  
Before And After ◽  
Native Speakers Of English

Aim: The aim of this study is to compare the color stability of different universal composites and to evaluate the effects of keeping them in water for 1 week before coloring. Methodology: Filtek Ultimate (FU), Estelite Ʃ Quick (EQ), and Ceram X One (CX) composites were used. The specimens were kept in the dark, dry environment for 24 hours, then polished, and each composite group was divided into 3 groups: the control, the group that was kept in water for 1 week before coloring and coloring (n=7). The samples in the control group were kept in distilled water for 3 weeks. Samples in the coloring group were colored with coffee for 2 weeks (C), and the samples in the last group were kept in water for 1 week and then stained with coffee for 2 weeks (W+C) (n=7). Color measurements for all samples were taken twice, once before and once after the coloring period. The color changes of the samples were measured using the ∆E* parameter, which was calculated with before and after measurements.  Results: For all composite resins, the ΔE values of the samples in the W+C and C groups were significantly higher than those in the control group. When the composites were compared with each other, the differences between the ΔE values of the composites in the control, W+C, and C groups were not statistically significant. For FU and ESQ, at the end of the coloration period, there were no statistically significant differences between the W+C and C groups. However, for CX, the color change of the samples in the W+C group was significantly higher than that in  the C group. Conclusion: Storage in distilled water for 1 week before staining did not reduce the color change values of the samples. Thus, after composite restorations are performed, there is no need to advise patients to avoid staining foods, especially in the first week after restoration.   How to cite this article: Abdulateef OF, Çobanoğlu N, Gürses M. Comparative evaluation of the color stability of universal composites. Int Dent Res 2021;11(Suppl.1):234-7. https://doi.org/10.5577/intdentres.2021.vol11.suppl1.34   Linguistic Revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.

scholarly journals Comparing the Language Style Used by Native and Non-native English Speakers in The Ellen Show

2021 ◽  
Vol 11 (4) ◽  
pp. 579-588
Author(s):  
Ade Dwi Cahyanti ◽  
Rudi Hartono ◽  
Dwi Anggani Linggar Bharati
Keyword(s):  
Qualitative Method ◽  
Native Speakers ◽  
Native English Speakers ◽  
Social Consequences ◽  
English Speakers ◽  
Good Communication ◽  
Language Style ◽  
Native Speakers Of English ◽  
The Difference ◽  
Language Styles

As the user of communication especially in English, the speaker has to consider the interlocutor’s position in order to achieve good communication. Here, the speakers which include native and non-native English speakers must choose an appropriate language style for the different interlocutors to avoid social consequences. The purposes of this research were to analyze the use of language style of those speakers in The Ellen Show. Also, it focused on the differences and the similarities between those speakers. Last, it focused on the factors influencing the use of language style. The research used the qualitative method which focuses on content analysis. Here, it focused on three native speakers and three non-native speakers of English as the guests in The Ellen Show. The Ellen Show is a talk show program with a casual discussion that talks about a particular topic or issue which consists of a host, the guest(s) being interviewed, the home audience, and the studio audience from which the host might get some responses from.The findings revealed that the native English speakers used all types of language styles. Meanwhile, the non-native speakers used three types of language styles. Then, the similarities were that both speakers applied formal style, consultative style, and casual style in their utterances. However, the difference was the non-native English speakers did not apply frozen style and intimate style. Furthermore, those speakers used language style because it influenced the participant, the setting, the topic, and the function. Therefore, it is concluded that language styles were useful in English utterances either by native speakers or non-native English speakers.   The speaker has to consider the interlocutor’s position in order to achieve good communication. Here, the speakers which include native and non-native English speakers must choose an appropriate language style for the different interlocutors to avoid social consequences. The purposes of this research were to analyze the use of language style of those speakers in The Ellen Show. Also, it focused on the differences and the similarities between those speakers. Last, it focused on the factors influencing the use of language style. The research used the qualitative method which focuses on content analysis. Here, it focused on three native speakers and three non-native speakers of English as the guests in The Ellen Show. The findings revealed that the native English speakers used all types of language styles. Meanwhile, the non-native speakers used three types of language styles. Then, the similarities were that both speakers applied formal style, consultative style, and casual style in their utterances. However, the difference was the non-native English speakers did not apply frozen style and intimate style. Furthermore, those speakers used language style because it influenced the participant, the setting, the topic, and the function. Therefore, it is concluded that language styles were useful in English utterances either by native speakers or non-native English speakers.

scholarly journals The maxillary expansion procedures, the types, and the root resorption analysis methods

2019 ◽  
Vol 9 (3) ◽  
pp. 145-151
Author(s):  
Refika Topal ◽  
Seher Gündüz Arslan
Keyword(s):  
Orthodontic Treatment ◽  
Transverse Direction ◽  
Root Resorption ◽  
Native Speakers ◽  
Rapid Maxillary Expansion ◽  
Maxillary Expansion ◽  
Analysis Methods ◽  
Native Speakers Of English

Transversal constriction of the maxilla is a common problem and may occur due to many reasons.The maxillary expansion procedures can be classified as rapid maxillary expansion (RME), semi-rapid maxillary expansion (SRME), and slow maxillary expansion (SME). In orthodontic treatment prosodure, it has been evaluated that it causes root resorption especially in the support teeth in many apparatus used for orthodontic treatment and in the expansion apparatus used in the treatment of transverse direction of maxilla. In this review, we aimed to evaluate maxiller expansion protocols and the methods of examining resorption in support teeth.   How to cite this article: Topal R, Gündüz Arslan S. The maxillary expansion procedures, the types, and the root resorption analysis methods. Int Dent Res 2019;9(3):145-51.   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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