Iranian Journal of Orthodontics最新文献_第2页

Evaluation of the Effect of Incorporation of Nano-fluorohydroxyapatite on Tensile Strength and Modulus of Elasticity of an Essix Plate 纳米氟羟基磷灰石掺入对Essix板抗拉强度和弹性模量影响的评价

Iranian Journal of Orthodontics Pub Date : 2021-03-27 DOI: 10.5812/IJO.114240

Hooman Shafaee, Hamidreza Aboutorabzadeh, H. Bagheri, Banafshe Yaloodbardan, Abdolrasoul Rangrazi

{"title":"Evaluation of the Effect of Incorporation of Nano-fluorohydroxyapatite on Tensile Strength and Modulus of Elasticity of an Essix Plate","authors":"Hooman Shafaee, Hamidreza Aboutorabzadeh, H. Bagheri, Banafshe Yaloodbardan, Abdolrasoul Rangrazi","doi":"10.5812/IJO.114240","DOIUrl":"https://doi.org/10.5812/IJO.114240","url":null,"abstract":"Background: Nano-fluorohydroxyapatite (nano-FHA) is a caries preventive agent that is applied in many fields of dentistry and has the potential of being added to Essix retainers to create antibacterial properties. Objectives: The purpose of this study was to investigate the effect of nano-fluorohydroxyapatite addition on the tensile strength and modulus of elasticity of an Essix plate. Methods: The nano-fluorohydroxyapatite was synthesized and added to an Essix plate in various weight percentages: 0% (group1), 0.1% (group2) and 0.5% (group 3). We performed the measuring of flexural strength and modulus of elasticity for the experimented three groups using a universal testing machine. The data were analyzed through one-way ANOVA and Tukey’s test at the significance level of 0.05. Results: Accordingly, the obtained results were indicative of significant differences between the groups (P-value = 0.003); however, the difference between group 2 and control group was not statistically notable (P-value = 0.427). Furthermore, the tensile strength of group 3 significantly decreased (P-value = 0.04). In regards to the modulus of elasticity, the data were suggestive of significant differences between the groups (P-value = 0.002). Apparently, the modulus of elasticity of group 2 and group 3 decreased significantly compared to that of the control group (group 1). Conclusions: We can conclude that nano-FHA can be incorporated into Essix plates in concentrations of up to 0.1 wt% in order to create some caries preventing effects with no negative effects on tensile strength; however, adding nano-FHA to Essix plate will decrease modulus of elasticity.","PeriodicalId":320129,"journal":{"name":"Iranian Journal of Orthodontics","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128045684","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: 2

Prevalence of Malocclusion in Patients with Thalassemia Major: A Cross-sectional Study 地中海贫血患者错颌畸形患病率:一项横断面研究

Iranian Journal of Orthodontics Pub Date : 2020-09-30 DOI: 10.5812/ijo.117155

Parastoo Namdar, A. Shiva, Tahura Etezadi, J. Charati, H. Karami, Sina Iri

{"title":"Prevalence of Malocclusion in Patients with Thalassemia Major: A Cross-sectional Study","authors":"Parastoo Namdar, A. Shiva, Tahura Etezadi, J. Charati, H. Karami, Sina Iri","doi":"10.5812/ijo.117155","DOIUrl":"https://doi.org/10.5812/ijo.117155","url":null,"abstract":"Background: Iran lies in the world's thalassemia belt; accordingly, the beta‐thalassemia gene is carried by 4% of the Iranian population. Due to the dearth of research and literature available on the prevalence of malocclusions in the Iranian population with beta-thalassemia major, this study was conducted to determine the prevalence and severity of facial abnormalities among patients who were referred to Bu-Ali Sina Hospital, Sari, Iran. Methods: This descriptive cross-sectional study was conducted on 200 patients with thalassemia major who were referred to the care unit of Bu-Ali Sina teaching and therapeutic Hospital, Sari, Iran, in 2018. The patients were then visited by a trained dentist who had been given the necessary theoretical and practical training. Malocclusion was classified based on Angle's classification. Spacing, overcrowding, overjet, and overbite were measured, and the distances were recorded based on a checklist. Results: The prevalence of malocclusions obtained was 87.5%, which included malocclusions of Class I (34%), Class II (31%), and Classes III (22%) amongst patients. There was no significant relationship between the type of malocclusion and gender (P = 0.77). Moreover, no significant difference was observed among patients with thalassemia major and different classes of malocclusions in terms of age both in males (P = 0.49) and females (P = 0.58). Conclusions: Malocclusions are common among adolescents and adults with thalassemia, which is not associated with age or gender. Therefore, patients should be regularly visited and followed up by a dentist to manage and control their dental problems. In addition, effective and preventive measures, as well as health education should be seriously considered in these patients.","PeriodicalId":320129,"journal":{"name":"Iranian Journal of Orthodontics","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126989829","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

Assessment of Anterior Malar Projections Using Cephalometrics and Clinical Photographs in a South Indian Population 在南印度人群中使用头测术和临床照片评估颧前突

Iranian Journal of Orthodontics Pub Date : 2020-04-11 DOI: 10.5812/ijo.101991

A. Basak, P. Vibhute, C. Patil, Vinay Umale, R. Kulshrestha, Khusali Rathod

{"title":"Assessment of Anterior Malar Projections Using Cephalometrics and Clinical Photographs in a South Indian Population","authors":"A. Basak, P. Vibhute, C. Patil, Vinay Umale, R. Kulshrestha, Khusali Rathod","doi":"10.5812/ijo.101991","DOIUrl":"https://doi.org/10.5812/ijo.101991","url":null,"abstract":"Objectives: This study aimed to evaluate gender dimorphism in anterior malar projections using clinical photographs and lateral cephalograms. Methods: Thirty subjects aged 18 25 years were taken for the study. Based on the gender they were divided into two groups group A (15 subjects) male and group B (15 subjects) female. On the profile photographs positive and negative vectors were labelled. Sellanasion-orbitale (SNO) angle was delineated with the aid of Nemoceph software. The data was then statistically analysed. Results: Skeletal differences between the positive and negative vector groups on basis of SNO angles were statistically significant (P < 0.001). The angulation value obtained for SNO was smaller in the negative vector when compared to the positive vector on an average by 5.9°. No difference in values between males and females was seen. Conclusions: The projections of anterior malar can be effectively categorized by mere visually assessing the vector relationship (by photographs). This method can be used to diagnose maxillary hypoplasia and can help plan different treatment alternatives.","PeriodicalId":320129,"journal":{"name":"Iranian Journal of Orthodontics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130901330","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

The Effect of Repeated Sterilization on the Properties of Orthodontic Temporary Anchorage Devices 反复灭菌对正畸临时支抗装置性能的影响

Iranian Journal of Orthodontics Pub Date : 2020-04-06 DOI: 10.5812/ijo.103285

A. Shahroudi, Behrad Tanbakuchi

{"title":"The Effect of Repeated Sterilization on the Properties of Orthodontic Temporary Anchorage Devices","authors":"A. Shahroudi, Behrad Tanbakuchi","doi":"10.5812/ijo.103285","DOIUrl":"https://doi.org/10.5812/ijo.103285","url":null,"abstract":"Context: Temporary anchorage devices (TADs) have been introduced to orthodontic treatment for enhancing anchorage control. It is claimed that they are not disposable and can be used several times after sterilization process. However, the question is whether this repeated sterilization has any effect on the properties of these devices. This study was done to review the available articles that had addressed various aspects of this issue. Evidence Acquisition: The authors searched several electronic data bases including PubMed, Google Scholar, Scopus and Embase with several key words related to orthodontic temporary anchorage devices and sterilization. The relevant articles were reviewed and categorized in the following subjects: mechanical properties, primary stability and clinical success, and histologic and microscopic characteristics. Results: Sterilizing the temporary anchorage devices seems not to affect the mechanical properties of these devices. Conclusions: In terms of primary stability, and clinical success, very few studies are available. Histologic and microscopic evaluations showed some alteration in the surface characteristics of TADs including some mineral precipitation.","PeriodicalId":320129,"journal":{"name":"Iranian Journal of Orthodontics","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129916042","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

The Effects of Reverse Chin Cap Appliance Therapy on Dentofacial Hard and Soft Tissues 下颌帽反向矫治对牙面硬、软组织的影响

Iranian Journal of Orthodontics Pub Date : 2020-03-02 DOI: 10.5812/ijo.99211

S. Sadeghi, Z. Hedayati

{"title":"The Effects of Reverse Chin Cap Appliance Therapy on Dentofacial Hard and Soft Tissues","authors":"S. Sadeghi, Z. Hedayati","doi":"10.5812/ijo.99211","DOIUrl":"https://doi.org/10.5812/ijo.99211","url":null,"abstract":"Background: Reverse chin cap appliance consists of a removable plate that is attached to a vertical projection hooks via elastics. This appliance is preferred for treatment of combination of maxillary retrognathia and mandibular prognathism malocclusion. Objectives: The aim of this study was to assess the effects of the reverse chin cap appliance to hard and soft tissues. Methods: In this retrospective study 16 consecutive Class III patients (6 females, 10 males) with mean age of 9.3 ± 2 (Mean ± SD) years, who were treated with reverse chin cap appliance were selected. Preand posttreatment lateral cephalograms were analyzed. The overall changes were compared with growth changes in 20 control samples of Class I (10 females and 10 males) with Cl I occlusion and average age of 9.9 ± 3 (Mean ± SD) years. Independent Samples t-test was used to compare mean differences between the two of them. Differences were considered significant at P < 0.05. Results: At the end of treatment in treatment group, SNB angle decreased 3.7o and ANB angle increased by 2.9o both (P = 0.005). Mandibular length decreased 0.18 mm (P = 0.009). Lower incisors retroclined 10.03o (P = 0.001). Linear distance of the upper lip and lower lip to the E-line significantly decreased 2.3 mm (P = 0.04) 1.1 mm (P = 0.05) respectively. Nasolabial angle decreased significantly 4.1o (P = 0.005). Conclusions: Reverse chin cap appliance therapy has a skeletal and dental effects. This treatment is effective in correction of the Cl III malocclusion by retroclination of the lower incisors, and retardation of mandibular growth. At the end of treatment, soft tissue profile","PeriodicalId":320129,"journal":{"name":"Iranian Journal of Orthodontics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133883046","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

The Effect of First Permanent Tooth Eruption on Dental Arch Dimension 第一恒牙萌出对牙弓尺寸的影响

Iranian Journal of Orthodontics Pub Date : 2020-01-22 DOI: 10.5812/ijo.99738

S. Ghadimi, Mandana Tosifian, A. Baghalian, B. Seraj

{"title":"The Effect of First Permanent Tooth Eruption on Dental Arch Dimension","authors":"S. Ghadimi, Mandana Tosifian, A. Baghalian, B. Seraj","doi":"10.5812/ijo.99738","DOIUrl":"https://doi.org/10.5812/ijo.99738","url":null,"abstract":"Background: Crowding is one of the most prevalent types of malocclusion as well as a major problem in clinical orthodontics. It is essential to know the cause of crowding in order to achieve a better treatment. Objectives: A longitudinal analysis of arch dimension changes in late primary and early mixed dentition periods in children was designed and investigated the effect of eruption of precedence on the arch size in the samples under study. Methods: This longitudinal study was carried out on 32 children aged 5.5 6.5 years who had no erupted permanent dentition. Impression was taken and the arch perimeter, depth and width as well as tooth size were measured by a digital calliper and a brass wire on casts. After eruption of the first permanent tooth, the second impression was taken; the above-mentioned parameters were measured on the second casts. Data were analysed by ANOVA test. Results: Four pattern of eruption of precedence were as follows: maxillary 1st molar, mandibular incisors, Mandibular 1st molars and simultaneous eruption of maxillary and mandibular 1st molars. With eruption of mandibular central incisors, inter canine width and overjet increased by 0.81 and 0.27 mm, respectively. The mandibular arch perimeter increased by 2.25 mm with simultaneous eruption of maxillary and mandibular permanent first molars. The maxillary arch perimeter increased by 1.25 mm and 1.50 mm with eruption of maxillary first molars and simultaneous eruption of maxillary permanent first molars, respectively. Conclusions: Eruption precedence had a significant effect on changing mandibular inter canine width, maxillary arch perimeter, mandibular arch perimeter and overjet.","PeriodicalId":320129,"journal":{"name":"Iranian Journal of Orthodontics","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122659771","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

Comparitive Assessment of the Clinical Treatment Outcome and the Predicted Treatment Outcome of Clear Aligner Treatment; In Vivo Study 清除对准器治疗的临床疗效与预测疗效的比较评价体内研究

Iranian Journal of Orthodontics Pub Date : 2019-08-13 DOI: 10.5812/IJO.91853

Arisha Izhar, Gurkeerat Singh, Varun Goyal, R. Singh, N. Gupta, P. Pahuja

引用次数: 0

Possible Advantages of Self-Ligating Brackets: From Claims to Evidence, a Literature Review 自结扎支架可能的优点:从主张到证据，文献综述

Iranian Journal of Orthodontics Pub Date : 2019-03-28 DOI: 10.5812/IJO.90579

Homa Farhadifard, M. Keshvad, A. Hesamarefi, E. Mohammadi

引用次数: 0

Evaluation of Coating Stability, Surface Characteristics and Biocompatibility of Nano Particle Coated Stainless Steel, Nickel-Titanium and Beta-Titanium Orthodontic Arch Wires in Comparison with Uncoated Wires: An In-Vitro Study 纳米颗粒包覆不锈钢、镍钛和β -钛正畸弓丝与未包覆金属丝的体外稳定性、表面特性和生物相容性评价

Iranian Journal of Orthodontics Pub Date : 2019-03-06 DOI: 10.5812/IJO.69613

Vasim Pinchani, Ajit J Kalia, K. Sharif, S. Nene, Nasim Mirdehghan, Khadija M Dalvi