World journal of orthodontics最新文献_第8页

AAO offers support to WFO Executive Committee, strengthens connections with WFO affiliates. AAO向世界气象组织执行委员会提供支持，加强与世界气象组织附属机构的联系。

World journal of orthodontics Pub Date : 2010-01-01

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Redefining orthodontic space closure: sequential repetitive loading of the periodontal ligament--a clinical study. 重新定义正畸间隙关闭:牙周韧带的连续重复负荷-一项临床研究。

World journal of orthodontics Pub Date : 2010-01-01

Anmol S Kalha, Viral Ashok Kachiwala, Singatagere Nagaraj Govardhan, Richard P McLaughlin, Syed Zameer Khurshaid

{"title":"Redefining orthodontic space closure: sequential repetitive loading of the periodontal ligament--a clinical study.","authors":"Anmol S Kalha, Viral Ashok Kachiwala, Singatagere Nagaraj Govardhan, Richard P McLaughlin, Syed Zameer Khurshaid","doi":"","DOIUrl":"","url":null,"abstract":"Aims: To assess the rate of tooth movement, anchorage loss, root resorption, and alkaline phosphatase (ALP) activity in the gingival crevicular fluid (GCF) as a marker for bone remodeling during orthodontic space closure using two different mechanisms.Methods: Space closure was completed in 20 patients with extraction of all 4 premolars. Lateral cephalograms and radio-visiographs taken before (T1) and after (T2) space closure were assessed for anchorage loss and root resorption. Alkaline phosphatase levels were measured in 10 patients, which were divided into two groups of five each. Spaces were closed with a screw device in the first group and with active tie-backs in the second. Gingival crevicular fluid samples, collected at intervals, were assayed for alkaline phosphatase spectrophotometrically in each patient.Results: The mean rate of tooth movement was 1.32 ± 0.22 mm/month. The mean amount of anchorage loss in the maxilla and mandible was 1.23 ± 0.60 mm and 1.08 ± 0.65 mm, respectively. Sixty (25%) roots showed no root resorption, while 180 (75%) roots displayed mild to moderate blunting of their apices. Gingival crevicular fluid-alkaline phosphatase level increased significantly from day 7 to day 28 in both groups, but significantly more in the screw retraction group (P<.05).Conclusion: It is possible to infer that space closure occurs more rapidly with sequential repetitive loading of the periodontal ligament than with conventional active tie-backs. This observation is in concurrence with a significant increase in the gingival crevicular fluid-alkaline phosphatase level.","PeriodicalId":87213,"journal":{"name":"World journal of orthodontics","volume":"11 3","pages":"221-9"},"PeriodicalIF":0.0,"publicationDate":"2010-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"29309855","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}

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The ideal smile and its orthodontic implications. 理想的微笑和它的正畸含义。

World journal of orthodontics Pub Date : 2010-01-01

Sujala Ganapati Durgekar, Nagaraj K, Vijay Naik

{"title":"The ideal smile and its orthodontic implications.","authors":"Sujala Ganapati Durgekar, Nagaraj K, Vijay Naik","doi":"","DOIUrl":"","url":null,"abstract":"Aim: To determine the parameters for an ideal smile.Methods: Ten laypersons classified frontal photographs of 62 smiling individuals between 18 and 25 years of age into five categories: 1, poor; 2, fair; 3, good; 4, very good; and 5, excellent. The scores obtained for each smile were averaged. The five smiles with each the highest and lowest scores were analyzed for seven parameters: buccal corridor, smile index, smile symmetry, smile line ratio, upper lip line, smile arc, and upper lip curvature.Results: The five smiles with the highest scores were symmetrical with an average upper lip line and a consonant smile arc. Three of the five had an upward upper lip curvature. The smile line ratio, buccal corridor, and smile index for all five subjects ranged from 1.0 to 1.3 mm, 9.0% to 11.0%, and 4.0 to 6.0 mm, respectively. Two of the five smiles with the lowest scores were asymmetrical and three had a high upper lip line and a downward curvature, but all five had a nonconsonant smile arc. The smile line ratio, buccal corridor, and smile index for all five subjects ranged from -1.0 to 1.3 mm, 18.0% to 22.0%, and 7.0 to 10.0 mm, respectively.Conclusion: The seven investigated smile parameters can define characteristics of an ideal smile. These smile components should be included in the orthodontic problem list to help clinicians select the appropriate mechanotherapy.","PeriodicalId":87213,"journal":{"name":"World journal of orthodontics","volume":"11 3","pages":"211-20"},"PeriodicalIF":0.0,"publicationDate":"2010-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"29312018","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}

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Patients' report of discomfort and pain during debonding of orthodontic brackets: a comparative study of two methods. 患者报告正畸托槽脱粘过程中的不适和疼痛:两种方法的比较研究。

World journal of orthodontics Pub Date : 2010-01-01

Thiene Silva Normando, Flávio Siqueira Calçada, Weber José da Silva Ursi, David Normando

{"title":"Patients' report of discomfort and pain during debonding of orthodontic brackets: a comparative study of two methods.","authors":"Thiene Silva Normando, Flávio Siqueira Calçada, Weber José da Silva Ursi, David Normando","doi":"","DOIUrl":"","url":null,"abstract":"Aim: To examine the level of discomfort and pain reported by patients during debonding of orthodontic metallic brackets by comparing two of the most popular methods, since discomfort can negatively influence patients' motivation to undergo orthodontic treatment.Methods: This split-mouth designed study involved 37 patients. Two methods were used for bracket removal: a lift-off debonding instrument and a ligature-cutting plier. The level of discomfort during debonding was evaluated on a scale of 0 to 4; The Adhesive Remnant Index (ARI) was taken into consideration, as well. Comparison between the methods was statistically analyzed by using the Wilcoxon signed rank and chi-squared tests (P<.05).Results: Regarding the remnant adhesive, no significant difference was observed between the methods. Patients' reports of pain (score ≥2) were observed in 24.3% of teeth when the brackets were removed using a ligature-cutting plier, while there was a 12.8% report of pain when the lift-off instrument was employed (odds ratio [OR]=2.17, P<.001, χ(2)=17.7). Statistically significant lower scores for maxillary (P=.02) and mandibular central incisors (P=.02), maxillary lateral incisors (P=.02), mandibular canines (P=.00), and mandibular premolars (P=.00/.02) were reported when the lift-off instrument was employed.Conclusion: For the removal of orthodontic brackets, the lift-off instrument is better accepted by patients compared to the ligature cutting pliers, given that reports of pain are about two times lower with the former. The ARI was the same for both methods.","PeriodicalId":87213,"journal":{"name":"World journal of orthodontics","volume":"11 4","pages":"e29-34"},"PeriodicalIF":0.0,"publicationDate":"2010-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"29813813","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

Effect of fluoride solutions on the structure and hardness of plastic brackets. 氟化物溶液对塑料托架结构和硬度的影响。

World journal of orthodontics Pub Date : 2010-01-01

Christina Tziafa, Spiros Zinelis, Margarita Makou, Theodore Eliades, George Eliades

{"title":"Effect of fluoride solutions on the structure and hardness of plastic brackets.","authors":"Christina Tziafa, Spiros Zinelis, Margarita Makou, Theodore Eliades, George Eliades","doi":"","DOIUrl":"","url":null,"abstract":"Aim: To investigate the surface morphology, structure, molecular and elemental composition, and hardness of plastic brackets exposed to fluoride solutions.Methods: Two types of plastic brackets (Silkon Plus and SpiritMB) were exposed to three fluoride solutions 10 times for 1 minute each and then subjected to attenuated total relectance-Fournier transform infrared (ATR-FTIR) spectroscopy, scanning electron microscopy (SEM), x-ray energy dispersive microanalysis (EDS), and Vickers hardness (HV) testing. Hardness data were analyzed via two-way ANOVA and Tukey tests at the .05 level of significance with brackets and fluoride solution as predictors.Results: ATR-FTIR spectroscopy showed that both bracket types consisted of polycarbonate. After treatment with acidulated phosphate fluoride, an increased contribution of -OH peaks at 3,200 cm-1(stretching [str]) and 1,640 cm-1 (a type of vibration [b]) was observed in both brackets. SEM revealed that the acidulated phosphate fluoride solution had a strong effect on the morphology and surface structure of the two brackets; a general deterioration with projections of the reinforcing fibers was observed. EDS showed evidence of aluminum, calcium, silicon, magnesium, and titanium, which could be attributed to the reinforcing glass fiber constituents. Hardness ranged in the order of 20 HV with no difference among the two bracket types and the three fluoride exposures.Conclusion: Repeated exposure of plastic brackets to fluoride solutions has a pronounced effect on their structure and morphology, but not their hardness.","PeriodicalId":87213,"journal":{"name":"World journal of orthodontics","volume":"11 4","pages":"398-403"},"PeriodicalIF":0.0,"publicationDate":"2010-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"29814146","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}

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The effect of pulsed electromagnetic fields on the acceleration of tooth movement. 脉冲电磁场对牙齿运动加速度的影响。

World journal of orthodontics Pub Date : 2010-01-01

Rahman Showkatbakhsh, Abdolreza Jamilian, Mehrdad Showkatbakhsh

{"title":"The effect of pulsed electromagnetic fields on the acceleration of tooth movement.","authors":"Rahman Showkatbakhsh, Abdolreza Jamilian, Mehrdad Showkatbakhsh","doi":"","DOIUrl":"","url":null,"abstract":"Aim: Accelerating the speed of orthodontic tooth movement should contribute to the shortening of the treatment period. This study was designed to determine whether a pulsed electromagnetic field (PEMF) affects orthodontic tooth movement.Methods: The canines of one side of 10 patients (mean age 23.0 ± 3.3 years) who needed canine retraction were exposed to a PEMF; the canines on the contralateral sides of the same patients were not similarly exposed. After extraction of the maxillary first premolars, both canines were retracted with coil springs. A circuit and a watch battery were used to generate a PEMF (1 Hz). The generator was embedded in a removable appliance. Foil was used to obstruct the contol group from PEMF exposure. Patients were instructed to use the device from the commencement of canine retraction, and it was removed when Class I canine relationship was achieved in either of the canines after 5.0 ± 0.6 months. The changes in the space between the maxillary canine and first molar were measured to indicate the amount of tooth movement. The canine retraction distances were compared by paired t test. Afterward, the treatment plan was continued.Results: With exposure to a PEMF, canine retraction was 1.57 ± 0.83 mm more than the control group (P<.001).Conclusion: These findings suggest that application of a PEMF can accelerate orthodontic tooth movement.","PeriodicalId":87213,"journal":{"name":"World journal of orthodontics","volume":"11 4","pages":"e52-6"},"PeriodicalIF":0.0,"publicationDate":"2010-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"29814298","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

Muscular response to functional treatment of skeletal open-bite and deep-bite cases: an electromyographic study. 骨骼开咬和深咬病例功能治疗后的肌肉反应:肌电图研究。

World journal of orthodontics Pub Date : 2010-01-01

Ozge Uslu, Zuleyha Mirzen Arat, Mehmet Beyazoya, Ozden Ozyemisci Taskiran

{"title":"Muscular response to functional treatment of skeletal open-bite and deep-bite cases: an electromyographic study.","authors":"Ozge Uslu, Zuleyha Mirzen Arat, Mehmet Beyazoya, Ozden Ozyemisci Taskiran","doi":"","DOIUrl":"","url":null,"abstract":"Aim: To examine the muscular response of masseter and anterior temporal muscles to functional orthodontic treatment in skeletal open-bite and deep-bite subjects using electromyography (EMG).Methods: The study sample consisted of 31 subjects (18 males, 13 females) grouped into skeletal open-bite (mean age 12.6 ± 2.5 years) and deep-bite (mean age 11.6 ± 2.1 years) groups and into prepubertal and pubertal growth stages. All subjects received functional orthognathic treatment. EMGs recorded masseter (MMA) and anterior temporal muscle activity (ATMA) bilaterally during swallowing, chewing, and maximum intercuspitation before treatment (T1), 3 months after treatment (T2), and 6 months after treatment (T3). The differences in muscular response of the masseter and anterior temporal muscles to functional treatment in skeletal open-bite and deep-bite subjects were examined using repeated measurement (ANOVA) in factorial sequence and Duncan tests.Results: The open-bite group showed increased masticatory muscle activity and anterior rotation of the mandible. The deep-bite group showed decreased masticatory muscle activity, posterior rotation of the mandible, and an increase in gonial angle. Muscular response to functional treatment was observed during both growth stages, but it was more pronounced during puberty.Conclusion: Skeletal and neuromuscular improvements were observed in both treatment groups. Alterations in muscle activity as a result of functional treatment were observed in both growth stages, but they were more pronounced during puberty. For neuromuscular adaptation to occur, at least 6 months of functional treatment is required.","PeriodicalId":87213,"journal":{"name":"World journal of orthodontics","volume":"11 4","pages":"e85-93"},"PeriodicalIF":0.0,"publicationDate":"2010-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"29814303","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

Application and effectiveness of the Beneslider: a device to move molars distally. Beneslider:一种臼齿远端移动装置的应用和效果。

World journal of orthodontics Pub Date : 2010-01-01

Benedict Wilmes, Dieter Drescher

{"title":"Application and effectiveness of the Beneslider: a device to move molars distally.","authors":"Benedict Wilmes, Dieter Drescher","doi":"","DOIUrl":"","url":null,"abstract":"Aim: Distal movement of maxillary molars is a reasonable but often challenging treatment alternative for patients with a dental Class II occlusion and an increased overjet or anterior crowding. One problem is that most of the conventional noncompliance devices that distally move maxillary molars lead to some anchorage loss. As such, a new appliance was designed that is connected to two coupled mini-implants with exchangeable abutments. The aim of this study was to evaluate the effectiveness of this system for distal movement and the extent of its adverse effects.Methods: Maxillary molar distal movement was performed in 18 patients (10 females, eight males) in 6 to 10 months. The appliance (Beneslider) combined elements of the distal jet and Keles slider with two abutment mini-implants (spider screws or Benefit mini-implants). Pre- and posttreatment casts were scanned with cone beam computed tomography. To assess the amount of molar distal movement, molar rotation and transverse expansion the 3D scans were digitally superimposed. Lateral cephalograms were used to measure molar tipping.Results: The mean distal movement of the first molars amounted to 4.6 ± 1.5 mm, the mean mesial rotation to 3.4 ± 2.0 degrees, the transverse expansion in the first molar region to 1.9 ± 1.0 mm, and the distal tipping to 1.9 ± 1.3 degrees.Conclusion: Two coupled mini-implants with exchangeable abutments and a heavy wire were an effective way to bodily move maxillary molars distally.","PeriodicalId":87213,"journal":{"name":"World journal of orthodontics","volume":"11 4","pages":"331-40"},"PeriodicalIF":0.0,"publicationDate":"2010-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"29814780","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

A clinical evaluation of orthodontic mini-implants as intraoral anchorage for the intrusion of maxillary anterior teeth. 正畸微型种植体作为口腔内支抗治疗上颌前牙侵入的临床评价。

World journal of orthodontics Pub Date : 2010-01-01

Ruchi Saxena, Priyanka Sethi Kumar, Madhur Upadhyay, Vijay Naik

{"title":"A clinical evaluation of orthodontic mini-implants as intraoral anchorage for the intrusion of maxillary anterior teeth.","authors":"Ruchi Saxena, Priyanka Sethi Kumar, Madhur Upadhyay, Vijay Naik","doi":"","DOIUrl":"","url":null,"abstract":"Aim: To determine the efficacy of mini-implants as intraoral anchorage during en masse intrusion of the six maxillary anterior teeth.Methods: Ten patients from the Department of Orthodontics, KLE University, Belgaum, India, who required intrusion of their anterior teeth were selected for this study. After initial alignment and leveling, the maxillary arch was divided into one anterior segment and two posterior segments. A 0.021 3 0.025-inch stainless steel wire was placed in all three segments. In all patients, one mini-implant was placed bilaterally between the lateral incisor and canine. An elastic chain was used to deliver an intrusive force of 45 cN; it was supplemented by a distal force of about 20 cN per side. Patient records were taken at the beginning and end of intrusion.Results: The amount of intrusion was statistically and clinically significant. The canines were more intruded (3.5 ± 0.9 mm) than the incisors (2.9 ± 1.0 mm). The axial inclination of the incisors did not significantly change. The average duration to accomplish this intrusion was 4.0 ± 1.5 months, with a mean rate of 0.9 mm per month for the canines and 0.7 mm per month for the incisors.Conclusion: Mini-implants are an efficient and stable source of anchorage for the en masse intrusion of the six maxillary anterior teeth.","PeriodicalId":87213,"journal":{"name":"World journal of orthodontics","volume":"11 4","pages":"346-51"},"PeriodicalIF":0.0,"publicationDate":"2010-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"29814782","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

Correction of a severe skeletal Class II occlusion with a fixed functional appliance anchored on mini-implants: a patient report. 用微型种植体固定功能矫治器矫正严重骨骼II类咬合:一份患者报告。

World journal of orthodontics Pub Date : 2010-01-01

Narayan H Gandedkar, Ameet V Revankar, Sanjay V Ganeshkar

引用次数: 0