Orthodontics : the art and practice of dentofacial enhancement最新文献

{"title":"Miniscrew design and bone response: defining a correlation.","authors":"Karan Bhalla,&nbsp;Anmol S Kalha","doi":"10.11607/ortho.759","DOIUrl":"https://doi.org/10.11607/ortho.759","url":null,"abstract":"<p><strong>Aim: </strong>This prospective clinical trial aims at correlating miniscrew implant (MSI) micro/macro architecture, the method of placement, and biologic markers in peri-MSI crevicular fluid (PMICF) as indicators of bone response. A comparative evaluation of surface morphology of the MSIs before placement and after retrieval defines a correlation between the architecture of the MSIs and the bone- implant contact ratio.</p><p><strong>Methods: </strong>Two types of MSIs (hybrid and cylindric) were placed in ten patients using a split-mouth technique with the aid of a restricted random number table. Each of the MSIs was placed in the intraradicular area between the second premolar and first molar in the attached gingiva, 4 mm from the cementoenamel junction. The MSIs were immediately loaded, and PMICF was collected on days 0, 7, 14, 21, 28, and 42 and evaluated using a standard laboratory protocol. Surface morphology before placement and after retrieval of the MSI was observed using scanning electron microscopy (SEM) at a magnification of ×11, ×40, and ×1,000.</p><p><strong>Results: </strong>Alkaline phosphatase (ALP) and aspartate aminotransferase (AST) levels observed were lower in the hybrid MSI in comparison to the cylindric MSI. For both MSIs, ALP and AST levels showed a trend of significant increase at days 0, 7, and 14 and then a significant decrease on days 21, 28, and 42. Observations from SEM showed an oxide layer over the entire surface of the bone-expanding hybrid MSI; this layer was observed only at the tip of the cylindric MSI.</p><p><strong>Conclusions: </strong>Levels of both the diagnostic tissue destruction biologic markers ALP and AST are significantly higher in cylindric MSIs compared with hybrid MSIs, indicating a correlation to the type and method of placement of the MSI. The inflammatory markers show a definitive trend, with an elevation until day 14 and a decline after that, indicating an active inflammatory process until day 14 that could be correlated to tissue trauma. Observations from the SEM show a greater oxide layer formation in the hybrid MSI, which could imply a better bone-MSI contact ratio.</p>","PeriodicalId":89450,"journal":{"name":"Orthodontics : the art and practice of dentofacial enhancement","volume":"14 1","pages":"e10-21"},"PeriodicalIF":0.0,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.11607/ortho.759","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"31500802","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}

{"title":"Torque control in lingual orthodontics with lever arm mechanics: a case report.","authors":"M Aravind,&nbsp;G Shivaprakash,&nbsp;G C Ramesh","doi":"10.11607/ortho.979","DOIUrl":"https://doi.org/10.11607/ortho.979","url":null,"abstract":"<p><p>The aim of this report is to illustrate treatment mechanics for torque control in lingual mechanotherapy using a lever arm and transpalatal arch (TPA) tab system during en masse retraction of anterior teeth. An 18-year-old female with bimaxillary dentoalveolar proclination with crowding was treated with a lever arm-TPA tab system. The retraction tabs bent into the TPA placed across the maxillary second molars were used as anchorage. The retraction force on the maxillary anterior teeth was applied using lever arm hooks soldered between the lateral incisors and canines on a lingual mushroom archwire. By applying a retraction force to the lever arm hooks, the maxillary anterior teeth experienced greater palatal root movement as compared to the conventional retraction forces applied at the crown level. The tabs, placed high in the TPA, produced a distal tipping moment on the maxillary second molars, reinforcing their anchorage. The retraction force applied to the long lever arm hooks from the TPA tabs at the level of center of resistance (CRes) of anterior and posterior teeth is advantageous mainly in two aspects. First, it reinforces the anchorage, and second, it favors the palatal root movement of anterior teeth, thus obtaining better control over the torque during en masse retraction.</p>","PeriodicalId":89450,"journal":{"name":"Orthodontics : the art and practice of dentofacial enhancement","volume":"14 1","pages":"e186-96"},"PeriodicalIF":0.0,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.11607/ortho.979","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"31501781","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}

{"title":"Comparison of the effects of modified and full-coverage thermoplastic retainers on occlusal contacts.","authors":"Belma Işik Aslan,&nbsp;Müfide Dinçer,&nbsp;Orhan Salmanli,&nbsp;Muayad A M Qasem","doi":"10.11607/ortho.990","DOIUrl":"https://doi.org/10.11607/ortho.990","url":null,"abstract":"<p><strong>Aim: </strong>The purpose of this prospective study was to determine the number of contacts in centric occlusion during retention with modified and full-coverage thermoplastic Essix retainers.</p><p><strong>Methods: </strong>This research was based on 36 patients who were randomly assigned to wear either modified (18 patients) or full-coverage (18 patients) Essix retainers. Silicone-based bite registrations were used to record occlusal contacts at the beginning (T1), end of full-time (6 months; T2), and end of night-time (3 months; T3) wear of retainers. The occlusal contacts determined in treated patients were compared with the values of 18 untreated \"normal\" Class I subjects. Bonferroni-adjusted Wilcoxon and Kruskal-Wallis tests were used to evaluate intra- and intergroup differences.</p><p><strong>Results: </strong>Total posterior contacts increased significantly at T3 compared to T1 and T2 only in the modified Essix group. Non-ideal and total contacts on premolars, non- ideal and actual contacts on first molars, and actual contacts on second molars increased significantly at T3 in the modified Essix group. No significant increase was determined in the final total posterior contacts in the full-coverage Essix group. Actual contacts on premolars and first molars and total posterior actual contacts were significantly greater at T3 in the modified Essix group compared to the full-coverage Essix Group. Also the number of final posterior ideal contacts in the modified Essix group was greater than in the normal sample. Total anterior contacts decreased significantly in the modified Essix group, whereas they increased significantly in the full-coverage Essix group.</p><p><strong>Conclusions: </strong>Increase in posterior contacts was achieved only during night-time wear of modified Essix retainers.</p>","PeriodicalId":89450,"journal":{"name":"Orthodontics : the art and practice of dentofacial enhancement","volume":"14 1","pages":"e198-208"},"PeriodicalIF":0.0,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.11607/ortho.990","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"31501782","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}

{"title":"Uprighting of mandibular second molars with the sectional modified Loca system.","authors":"Daniel Celli,&nbsp;Enrico Gasperoni,&nbsp;Pierpaolo Pansoni,&nbsp;Roberto Deli","doi":"10.11607/ortho.847","DOIUrl":"https://doi.org/10.11607/ortho.847","url":null,"abstract":"<p><p>A new way to upright the mandibular second molar is described. The principles of the Loca system, originally used for molar distalization, are employed in the mandibular arch.</p>","PeriodicalId":89450,"journal":{"name":"Orthodontics : the art and practice of dentofacial enhancement","volume":"14 1","pages":"e118-25"},"PeriodicalIF":0.0,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.11607/ortho.847","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"31500805","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}

{"title":"Shear bond strength of orthodontic brackets bonded to porcelain following etching with Er:YAG laser versus hydrofluoric acid.","authors":"Soghra Yassaei,&nbsp;Farshad Moradi,&nbsp;Hossein Aghili,&nbsp;Mohamad Hosein Lotfi Kamran","doi":"10.11607/ortho.856","DOIUrl":"https://doi.org/10.11607/ortho.856","url":null,"abstract":"<p><strong>Aim: </strong>The purpose of the present study was to evaluate the shear bond strength of orthodontic brackets bonded to porcelain following etching with erbium-doped yttrium aluminum garnet (Er:YAG) laser compared with 9.6% hydrofluoric acid (HF).</p><p><strong>Methods: </strong>A total of 100 porcelain disk samples were divided into four groups, and after removing their glazed layer, the first group was etched with 9.6% HF, and the other three groups were etched with Er:YAG lasers of 1.6, 2, and 3.2 W, respectively. After application of silane on the disk surfaces, central incisor brackets were bonded with composite on the disks. The disks were mounted on an acrylic stand for measuring the shear bond strengths. The shear bond strengths were measured by a testing machine.</p><p><strong>Results: </strong>The mean shear bond strength in the laser group with power of 1.6 W (7.88 MPa) was more than that of the HF (7.4MPa), 2-W power (7.52 MPa), and 3.2-W power (7.45 MPa) groups, but this difference was not statistically significant. Examination with an electron microscope showed different patterns of etching by HF and laser. Also, etching by laser and HF had not resulted in cracks on the porcelain surface.</p><p><strong>Conclusion: </strong>Er:YAG laser can be a suitable method for bonding of orthodontic brackets to porcelain surfaces.</p>","PeriodicalId":89450,"journal":{"name":"Orthodontics : the art and practice of dentofacial enhancement","volume":"14 1","pages":"e82-7"},"PeriodicalIF":0.0,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.11607/ortho.856","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"31408175","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}

{"title":"Color stability of five orthodontic clear elastic ligatures.","authors":"Dener C Soldati,&nbsp;Roberta C Silva,&nbsp;Adauê S Oliveira,&nbsp;Marina R Kaizer,&nbsp;Rafael R Moraes","doi":"10.11607/ortho.892","DOIUrl":"https://doi.org/10.11607/ortho.892","url":null,"abstract":"<p><strong>Aim: </strong>In this study the color stability of five commercially available orthodontic clear elastic ligatures daily exposed to a staining agent (red wine) was investigated.</p><p><strong>Methods: </strong>The commercial brands tested were 3M Unitek, Abzil, American Orthodontics, Dentsply GAC, and Morelli. Baseline color readings (Commission Internationale de l'Eclairage [CIE] L*a*b* parameters) of 20 ligatures for each brand were carried out using a spectrophotometer. The ligatures were divided in two groups (n = 10): one group remained immersed in distilled water (control) throughout the period, while the other group was daily exposed to red wine (1 hour of immersion). Immersion media were daily renewed. Successive color readings were carried out after 7, 14, 21, and 28 days, and the chromatic variations calculated. Color variation data were analyzed by two-way repeated measures analysis of variance and Student-Newman-Keuls test (P < .05).</p><p><strong>Results: </strong>Storage in water increased staining until 14 days, and color receded after this period, irrespective of the brand. After 28 days of immersion in water, no significant difference among the commercial brands was observed. For the groups exposed to red wine, a significant increase in staining over the course of time was detected, irrespective of the brand. Ligatures from GAC and Morelli showed higher staining than the other materials, irrespective of the evaluation time. Ligatures from 3M Unitek and American generally showed lower pigmentation than the other brands.</p><p><strong>Conclusion: </strong>Exposure to a staining agent, cumulative exposure time, and commercial brand are factors that influence the color stability of clear elastic ligatures.</p>","PeriodicalId":89450,"journal":{"name":"Orthodontics : the art and practice of dentofacial enhancement","volume":"14 1","pages":"e60-5"},"PeriodicalIF":0.0,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.11607/ortho.892","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"31408695","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}

{"title":"Class III occlusion with missing maxillary first molars and facial asymmetry treated with intraoral vertical ramus osteotomy: 7-year follow-up.","authors":"Jae Hyun Park,&nbsp;Kiyoshi Tai,&nbsp;Hitoshi Hotokezaka,&nbsp;Yoshinobu Yanagi,&nbsp;Kazuhisa Ikeda","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>A 17-year-old girl with a Class III occlusion and facial asymmetry was treated with orthodontics and intraoral vertical ramus osteotomy (IVRO). She had a severe skeletal Class III relationship (Wits, -17 mm). Even though she had a prognathic mandible, she showed a straight rather than concave profile because of severe mandibular dental compensation. The patient also had severe mandibular deviation. After 17 months of presurgical orthodontic treatment, IVRO was performed. Total active treatment time was 26 months. Both occlusion and facial appearance were significantly improved by the surgical-orthodontic treatment. There were no functional problems during or after treatment. Posttreatment records after 7 years showed excellent results with good, stable occlusion; facial balance and harmony; and long-term stability.</p>","PeriodicalId":89450,"journal":{"name":"Orthodontics : the art and practice of dentofacial enhancement","volume":"13 1","pages":"110-21"},"PeriodicalIF":0.0,"publicationDate":"2012-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"30603668","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}

{"title":"Orthodontic management of high Angle Class II Division 1 malocclusion with traumatic bite: a case report.","authors":"Vinay Kumar Chugh,&nbsp;Vijay Prakash Sharma,&nbsp;Pradeep Tandon,&nbsp;Gyan Prakash Singh","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The orthodontic treatment of a young adolesent female with a high Angle Class II Division 1 malocclusion is presented. Successful treatment required a careful diagnosis, specific planning, and efficient biomechanical control of the force systems to correct the disharmony in the vertical and horizontal dimensions. En masse retraction of the six maxillary anterior teeth was done via a Kalra simultaneous intrusion and retraction archwire. Precise mechanics with excellent vertical control made it possible to successfully correct the malocclusion without undesirable sequelae.</p>","PeriodicalId":89450,"journal":{"name":"Orthodontics : the art and practice of dentofacial enhancement","volume":"13 1","pages":"e116-26"},"PeriodicalIF":0.0,"publicationDate":"2012-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"30601913","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}

{"title":"Three-dimensional quantification of the force system involved in a palatally impacted canine using a cantilever spring design.","authors":"Sumit Yadav,&nbsp;Jie Chen,&nbsp;Madhur Upadhyay,&nbsp;Eugene Roberts,&nbsp;Ravindra Nanda","doi":"","DOIUrl":"","url":null,"abstract":"<p><strong>Aim: </strong>Although much imaging research has focused on the localization and management of the impacted canines, optimal biomechanics for successful recovery are not clear. The purpose of this research was to delineate the three-dimensional (3D) effects of a single force applied using a Kilroy spring on a palatally impacted maxillary canine positioned at different angulations (5 to 40 degrees) with respect to the line of force application.</p><p><strong>Methods: </strong>A dentoform cast was modified to simulate a palatally impacted canine. Load cells placed in the dentoform simultaneously measured the three forces (Fx, Fy, and Fz) and three moments (Mx, My, and Mz) on the canine. The activation range and force system attenuation were measured for eight different positions of a palatally impacted canine (5 to 40 degrees) as the canine moves toward the occlusal plane. The results were analyzed statistically.</p><p><strong>Results: </strong>The minimum activation range for the Kilroy spring was 11 mm, and the maximum was 14 mm. At all the different impacted canine positions, the Kilroy spring had a low load deflection rate and did not require reactivation for the successful management of a palatally impacted maxillary canine.</p><p><strong>Conclusion: </strong>A 3D force system at different bracket angulations (ie, different positions of the impacted maxillary canine) can be successfully quantified using the orthodontic force transducer. Quantification of the force system provides critical information for appropriate selection of an optimal appliance.</p>","PeriodicalId":89450,"journal":{"name":"Orthodontics : the art and practice of dentofacial enhancement","volume":"13 1","pages":"22-33"},"PeriodicalIF":0.0,"publicationDate":"2012-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"30602154","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}

{"title":"The effects of fixed and removable face masks on maxillary deficiencies in growing patients.","authors":"Abdolreza Jamilian,&nbsp;Rahman Showkatbakhsh,&nbsp;Tannaz Taban","doi":"","DOIUrl":"","url":null,"abstract":"<p><strong>Aim: </strong>To compare the effects of two different types of face masks in the treatment of Class III malocclusions with maxillary deficiency in growing patients.</p><p><strong>Methods: </strong>Forty-three patients (21 boys and 22 girls) with maxillary deficiencies were selected. Twenty-one patients (10 boys and 11 girls) with a mean age of 8.9 ± 1.4 years were treated with maxillary removable appliances and face masks. Twenty-two patients (10 boys and 12 girls) with a mean age of 9.3 ± 1.2 years were treated with maxillary fixed appliances and face masks. Lateral cephalograms obtained at the beginning and end of the study were analyzed.</p><p><strong>Results: </strong>Paired t tests and Wilcoxon tests showed that SNA and ANB significantly increased in both groups. The Mann-Whitney test showed that there were no statistically significant differences between the two groups except for U1-SN, which increased by 6.2 ± 7.1 degrees in the removable face mask group and 11.1 ± 6.9 degrees in the fixed face mask group (P < .02).</p><p><strong>Conclusion: </strong>Both treatment modalities were successful in moving the maxilla forward. However, the maxillary incisors had more labial inclination in the fixed appliance group.</p>","PeriodicalId":89450,"journal":{"name":"Orthodontics : the art and practice of dentofacial enhancement","volume":"13 1","pages":"e37-43"},"PeriodicalIF":0.0,"publicationDate":"2012-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"30602379","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}