Dental Hypotheses最新文献_第7页

A Comparative Examination of Cyclic Fatigue and Fragment Length of Three Different Types of Endodontic Rotary Files: An In Vitro Study 三种不同类型牙髓旋转锉的循环疲劳和碎片长度的体外比较研究

IF 0.5

Dental Hypotheses Pub Date : 2022-04-01 DOI: 10.4103/denthyp.denthyp_13_22

Hanaa Abduljabbar Saleh, Othman Husham Abdulhameed

{"title":"A Comparative Examination of Cyclic Fatigue and Fragment Length of Three Different Types of Endodontic Rotary Files: An In Vitro Study","authors":"Hanaa Abduljabbar Saleh, Othman Husham Abdulhameed","doi":"10.4103/denthyp.denthyp_13_22","DOIUrl":"https://doi.org/10.4103/denthyp.denthyp_13_22","url":null,"abstract":"Introduction: Although of great scientific advancement in the properties and form, fracture of nickel-titanium (NiTi) files could occur during their use. The goal of this study was to compare resistance to cyclic fatigue of various rotary systems used in endodontics. Materials and Methods: Three types of NiTi rotary systems were tested – group A: One Curve, group B: Edge File, and group C: lusterdent NiTi files. In these files, taper is 0.06, and their diameter is 25 mm. Stainless steel block was used. This block contains artificial canals with a 60o curvature, 5 mm radius of curvature, 21 mm length, and 1.5 mm width. A number of cycles before fracture were obtained and measurement of fragment length was achieved. Statistical evaluation of readings was accomplished with ANOVA and Tukey post hoc test. Results: There were statistically significant differences between the three types of NiTi rotary systems considering the number of cycles before file fracture (P < 0.001). The differences between fracture lengths were not statistically significant (P = 0.15). Conclusion: The Edge File revealed the highest cyclic fatigue resistance.","PeriodicalId":43354,"journal":{"name":"Dental Hypotheses","volume":"13 1","pages":"49 - 52"},"PeriodicalIF":0.5,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43289980","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Evaluation of Total Antioxidant Capacity in Al-Daura Oil Refinery Workers and Its Relation to Oral and Periodontal Conditions: An Analytical Cross-Sectional Study Al-Daura炼油厂工人总抗氧化能力评价及其与口腔和牙周状况的关系:一项分析性横断面研究

IF 0.5

Dental Hypotheses Pub Date : 2022-04-01 DOI: 10.4103/denthyp.denthyp_33_21

A. Al-Qarakhli, Shaimaa Hamid Mudher, Shakir Mahmood Ali, Ali Yakub Majid

引用次数: 0

Filling Ability of Various Root Canal Sealers into Simulated Lateral Canals: An In Vitro Study 不同根管封闭剂对模拟侧根管充填能力的体外研究

IF 0.5

Dental Hypotheses Pub Date : 2022-04-01 DOI: 10.4103/denthyp.denthyp_64_21

Nur A. Alalaf, Emad Alkhalidi

引用次数: 0

Analysis of Therapy by Means of Gallium Aluminum Arsenide Laser During Orthodontic Tooth Movement: A Randomized, Split Mouth Controlled Clinical Trial 砷化镓铝激光治疗正畸牙齿移动的随机、分口对照临床试验分析

IF 0.5

Dental Hypotheses Pub Date : 2022-04-01 DOI: 10.4103/denthyp.denthyp_48_21

A. Giudice, G. Palazzo, P. Campagna, G. Fichera, G. Isola

{"title":"Analysis of Therapy by Means of Gallium Aluminum Arsenide Laser During Orthodontic Tooth Movement: A Randomized, Split Mouth Controlled Clinical Trial","authors":"A. Giudice, G. Palazzo, P. Campagna, G. Fichera, G. Isola","doi":"10.4103/denthyp.denthyp_48_21","DOIUrl":"https://doi.org/10.4103/denthyp.denthyp_48_21","url":null,"abstract":"Indroduction: Preliminary evidence have shown that low intensity laser therapy is able to increase the rate of tooth movement. The aim of this study was to analyze the effects of gallium aluminum arsenide (GaAlAs) laser therapy in the enhancement of speed of orthodontic tooth movement (OTM) in a clinical protocol. Materials and Methods: Thirty-six upper canines were analyzed on 18 enrolled patients. On all experimental canine, an orthodontic force of 40 g/side was applied by a nickel-titanium closed coil spring. Using a split mouth randomized design, the test side was treated using a diode laser operating at a wavelength of 780 nm in continuous wave mode with flattop handpiece (20 mW output power, dose of 5 J/cm2, and exposure time of 10 seconds) (test side) at baseline and at 7, 14, and 28 days and every 14 days until the space closure. On the control side, selected teeth were only tractionated. The primary outcome was the overall time needed to complete leveling and closing space, measured on study cast. The secondary outcome was the evaluation of pain levels related to tooth traction, evaluated using a visual analogue scale (VAS). Results: The test side showed a significant reduced overall time needed for tooth space closure (at 7 and 14 days) and less VAS score (P < 0.001) compared to control side. Conclusion: This study shows that the use of low-level laser therapy by means of GaAlAs laser was effective for accelerating tooth movement and reducing pain levels related to OTM.","PeriodicalId":43354,"journal":{"name":"Dental Hypotheses","volume":"13 1","pages":"61 - 66"},"PeriodicalIF":0.5,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49474539","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comparison of Fracture Resistance of the Endodontically Treated Roots with Two Sealer Types: An In Vitro Study 两种封闭剂对根管治疗后根抗折性的比较研究

IF 0.5

Dental Hypotheses Pub Date : 2022-04-01 DOI: 10.4103/denthyp.denthyp_29_22

N. Hajihassani, S. Heidari, M. Ghanati, Navid Mohammadi

引用次数: 0

Dentinal Defects Induced by Offset and Alternating Contact Endodontic Rotary Files: An In Vitro Study 偏置和交替接触牙髓旋转锉诱发的牙本质缺损:体外研究

IF 0.5

Dental Hypotheses Pub Date : 2022-04-01 DOI: 10.4103/denthyp.denthyp_138_21

A. Abass, Haidar Fadhil, F. Albaaj

{"title":"Dentinal Defects Induced by Offset and Alternating Contact Endodontic Rotary Files: An In Vitro Study","authors":"A. Abass, Haidar Fadhil, F. Albaaj","doi":"10.4103/denthyp.denthyp_138_21","DOIUrl":"https://doi.org/10.4103/denthyp.denthyp_138_21","url":null,"abstract":"Objective: Dentinal defects during root canal preparation could lead to treatment failure and tooth extraction. Many rotary files are manufactured with asymmetric cross sections or alternating cutting edges to minimize contact with the canal wall. Decreasing contacts may generate low stresses and, hence, fewer dental defects during root canal instrumentation. This study aimed to evaluate the incidence of dentinal defects induced by ProTaper Next, Wave One Gold (Dentsply Maillefer, Ballaigues, Switzerland), and iRace (FKG Dentaire SA, La Chaux-de-Fonds, Switzerland) in comparison to the symmetric file HyFlex CM (Coltene-Whaledent, Allstetten, Switzerland). Materials and Methods: Sixty extracted single-rooted premolars with round canals were selected for this study. All teeth were decoronated and divided into four experimental groups according to the tested file systems. In each group, 15 canals were prepared with the crown down technique using a speed and torque recommended by manufacturers. The root samples were then sectioned horizontally at 3, 6, and 9 mm from the apex and examined under a stereomicroscope to evaluate the presence or absence of dentinal defects. Data were statistically analyzed with SPSS software using a chi-square test. Results: Dentinal defects were observed at all canal levels following all methods of instrumentation. ProTaper Next showed the lowest values of dentinal defects, whereas Hyflex CM displayed the highest values. Conclusion: Files with few contacts with the canal wall decreased the number of dentinal defects compared to the HyFlex CM file, with a nonsignificant difference being observed.","PeriodicalId":43354,"journal":{"name":"Dental Hypotheses","volume":"13 1","pages":"53 - 56"},"PeriodicalIF":0.5,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47652510","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Morphological Evaluation of Impacted Maxillary Canine and Adjacent Teeth Using Three-Dimensional Reconstructed CBCT Images: An Analytical Cross-Sectional Study 用三维重建的CBCT图像评价上颌犬和邻牙的阻生形态:一项分析性横断面研究

IF 0.5

Dental Hypotheses Pub Date : 2022-04-01 DOI: 10.4103/denthyp.denthyp_44_22

Priya Kanak, Agrawal Poonam, B. Dinesh Kumar, M. Richa, S. Neelam, Gupta Rajat

{"title":"Morphological Evaluation of Impacted Maxillary Canine and Adjacent Teeth Using Three-Dimensional Reconstructed CBCT Images: An Analytical Cross-Sectional Study","authors":"Priya Kanak, Agrawal Poonam, B. Dinesh Kumar, M. Richa, S. Neelam, Gupta Rajat","doi":"10.4103/denthyp.denthyp_44_22","DOIUrl":"https://doi.org/10.4103/denthyp.denthyp_44_22","url":null,"abstract":"Introduction: The structural characteristics of unilaterally impacted maxillary canines and adjacent teeth were compared to the nonimpacted side. Three-dimensional (3D) cone-beam computed tomography (CBCT) was used to analyze and evaluate the various parameters. The aim of this study was a quantitative comparison of teeth adjacent to buccally and palatally impacted maxillary canines. Methods: CBCT records of 40 patients with unilateral impacted maxillary canine were allocated to this study. The morphological characteristics of teeth on the impaction and non-impaction sides of the same patient were examined. 3D reconstructed CBCT images were assessed using the OnDemand 3D program. Results: The dependent samples t test was used for data analysis with a level of statistical significance of 0.05. There was a significant increase in the size of the maxillary canine crown and a decrease in the maxillary lateral incisor root dimensions on the impacted side. No significant difference was observed in the morphology of the maxillary first premolar on either side. Conclusion: The impacted canine showed greater size compared to the eruption side. The decrease in root dimensions of the lateral incisor on the impacted side may indicate the possibility of root resorption.","PeriodicalId":43354,"journal":{"name":"Dental Hypotheses","volume":"13 1","pages":"70 - 73"},"PeriodicalIF":0.5,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46642691","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Validation of Questionnaires in Screening for Restorative Treatment Need among 15-, 21-, and 40-year olds 15岁、21岁和40岁人群恢复性治疗需求筛查问卷的验证

IF 0.5

Dental Hypotheses Pub Date : 2022-01-01 DOI: 10.4103/denthyp.denthyp_58_21

Antti Kamppi, A. Paananen, A. Laajala, S. Karki, K. Kukkola, E. Molkoselka, A. Makynen, M. Laitala, J. Päkkilä, V. Anttonen, T. Tanner

{"title":"Validation of Questionnaires in Screening for Restorative Treatment Need among 15-, 21-, and 40-year olds","authors":"Antti Kamppi, A. Paananen, A. Laajala, S. Karki, K. Kukkola, E. Molkoselka, A. Makynen, M. Laitala, J. Päkkilä, V. Anttonen, T. Tanner","doi":"10.4103/denthyp.denthyp_58_21","DOIUrl":"https://doi.org/10.4103/denthyp.denthyp_58_21","url":null,"abstract":"Introduction: This cross-sectional study aims to investigate the association between three age-specific questionnaires in three age groups and restorative dental treatment need. Materials and methods: Three separate questionnaires were designed on etiology of dental caries in different age groups. Randomly selected 15- (n = 36), 21- (n = 21), and 40-year-old (n = 45) subjects answered these questionnaires. Responses were compared to restorative treatment need (DT) according to the clinical oral examination, which calibrated examiner performed. Results: Responses to questionnaires were only indicative in prediction of restorative treatment need at individual level. Kappa values for 15-, 21-, and 40-year olds, between responses and restorative treatment need were 0.01, 0.44, and 0.33, respectively. Conclusion: The need for restorative care could plausible be screened with a questionnaire among the 21- and 40-year olds, but not among 15-year olds in a country with low caries prevalence. Further development of questionnaires and studies are needed.","PeriodicalId":43354,"journal":{"name":"Dental Hypotheses","volume":"13 1","pages":"1 - 5"},"PeriodicalIF":0.5,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44993850","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Efficacy of XP-endo Finisher File on the Removal of Calcium Hydroxide from the Root Canals: An In Vitro Study XP-endo整理剂对根管中氢氧化钙的去除效果:体外研究

IF 0.5

Dental Hypotheses Pub Date : 2022-01-01 DOI: 10.4103/denthyp.denthyp_53_21

S. Aflaki, O. Alavi, Hamidreza Zeynal-Kelishomi, Alireza Darvish, Mohamadjavad Karamshahi

{"title":"Efficacy of XP-endo Finisher File on the Removal of Calcium Hydroxide from the Root Canals: An In Vitro Study","authors":"S. Aflaki, O. Alavi, Hamidreza Zeynal-Kelishomi, Alireza Darvish, Mohamadjavad Karamshahi","doi":"10.4103/denthyp.denthyp_53_21","DOIUrl":"https://doi.org/10.4103/denthyp.denthyp_53_21","url":null,"abstract":"Introduction: Calcium hydroxide must be completely removed from the root canal before the endodontic therapy. One of the methods to remove calcium hydroxide is XP-endo finisher file which has conflicting results. This study aimed to compare the efficacy of XP-endo finisher in removing calcium hydroxide with other irrigation methods. Materials and methods: In this experimental in vitro study, 48 teeth were selected. Each tooth was split longitudinally. Standardized grooves were prepared in the middle and apical third of the canals and then were filled with calcium hydroxide. The roots were randomly divided into three groups according to calcium hydroxide removal methods: XP-endo finisher, passive ultrasonic irrigation, and syringe needle irrigation. The amount of remaining medicament was evaluated using a scoring system. Chi-square was used to study the difference between the qualitative variables. The significant level was P < 0.05. Results: In the middle part, XP-endo finisher removed calcium hydroxide significantly higher than other methods (P = 0.005). In the apical part, no significant difference was observed among the groups (P = 0.47). Conclusion: All methods removed more calcium hydroxide in the middle than the apical part. In the middle part, XP-endo finisher removed calcium hydroxide more than the other methods from the root canals.","PeriodicalId":43354,"journal":{"name":"Dental Hypotheses","volume":"13 1","pages":"20 - 23"},"PeriodicalIF":0.5,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45287060","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comparison of Cutting Efficiency and Safety of 10/0.04 RaCe and Mtwo Rotary File Systems in Reaching the Full Root Canal Working Length: An In Vitro Study 10/0.04 RaCe和Mtwo旋转锉系统达到全根管工作长度的切削效率和安全性的比较：体外研究

IF 0.5

Dental Hypotheses Pub Date : 2022-01-01 DOI: 10.4103/denthyp.denthyp_185_21

Pouya Abedi, Peiman Gilani, M. Fathollahi, F. Iranmanesh

{"title":"Comparison of Cutting Efficiency and Safety of 10/0.04 RaCe and Mtwo Rotary File Systems in Reaching the Full Root Canal Working Length: An In Vitro Study","authors":"Pouya Abedi, Peiman Gilani, M. Fathollahi, F. Iranmanesh","doi":"10.4103/denthyp.denthyp_185_21","DOIUrl":"https://doi.org/10.4103/denthyp.denthyp_185_21","url":null,"abstract":"Introduction: Both RaCe and Mtwo rotary systems introduced the 10/0.04 file as the first file used in the root canal (Glide path). This study aims to compare different factors of both the rotary systems, including cutting efficacy, file fracture, topography changes of files, and changes of the root canal. Materials and Methods: In this laboratory study, 12 RaCe and 12 Mtwo files were prepared and tested on 24 resin blocks with 30° curvature. The time to reach the working length was recorded. Topographical changes of the files have been observed with a stereomicroscope if needed. Changes in resin blocks were measured by photographing and using Photoshop software. Data were analyzed through an independent two-sample t test and likelihood-ratio chi-squared test. Results: Time to reach the working length was significantly lower in the RaCe group than in the Mtwo group (3.57 ± 0.56 s vs. 10.33 ± 2.25 s, P < 0.001). File fracture did not occur in any of the two rotary systems. Topographical changes of the files in RaCe group were also less than the Mtwo group (P = 0.032). Conclusion: The RaCe file is faster in reaching the working length. Both files are safe and do not cause drastic changes in the root canal.","PeriodicalId":43354,"journal":{"name":"Dental Hypotheses","volume":"13 1","pages":"6 - 9"},"PeriodicalIF":0.5,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46225093","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0