Orthodontics : the art and practice of dentofacial enhancement最新文献_第4页

In vivo comparison of the friction forces in new and used brackets. 新旧托槽摩擦力的体内比较。

Orthodontics : the art and practice of dentofacial enhancement Pub Date : 2012-01-01

Alexandre A Ribeiro, Cláudia T Mattos, Antonio Carlos O Ruellas, Monica T S Araújo, Carlos Nelson Elias

{"title":"In vivo comparison of the friction forces in new and used brackets.","authors":"Alexandre A Ribeiro, Cláudia T Mattos, Antonio Carlos O Ruellas, Monica T S Araújo, Carlos Nelson Elias","doi":"","DOIUrl":"","url":null,"abstract":"Studies that evaluate frictional force on orthodontic brackets usually compare ligature, archwire size, bracket alloys, and systems. However, these studies do not simulate in vitro specific conditions of in vivo situations. Aiming to evaluate some conditions not created in vitro, 30 used standard edgewise brackets (30.7 months) collected from patients in the end of treatment (group 1) and 20 as-received brackets (group 2) of the same brand were compared. The brackets used in vivo were carefully removed to avoid deformation. Frictional resistance tests of both groups were performed in a universal testing machine using a system that standardizes normal force. Five brackets from each group were analyzed with scanning electron microscopy (SEM). Student t tests were used to compare the frictional force between groups 1 and 2 and showed a statistically difference (32.91 and 21.22 g, respectively). The Mann-Whitney test showed that group 1 had more organic matter attached to the slot surface compared with group 2 (P < .05). However, a comparison of topography between the groups did not show a statistically significant difference. SEM analysis showed a statistically high correlation (r = 0.73) between organic matter adhesion to the slot surface and frictional resistance. However, the results were not significant. These results indicate the clearance of brackets and wires during sliding mechanics.","PeriodicalId":89450,"journal":{"name":"Orthodontics : the art and practice of dentofacial enhancement","volume":"13 1","pages":"e44-50"},"PeriodicalIF":0.0,"publicationDate":"2012-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"30602380","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

KD loop for increasing arch perimeter in cleft and noncleft cases. KD环增加弓周长在裂和非裂情况下。

Orthodontics : the art and practice of dentofacial enhancement Pub Date : 2012-01-01

Kartik D Dholakia, Shweta R Bhat

{"title":"KD loop for increasing arch perimeter in cleft and noncleft cases.","authors":"Kartik D Dholakia, Shweta R Bhat","doi":"","DOIUrl":"","url":null,"abstract":"One of the many indications for dental arch expansion in treating malocclusion is to achieve arch compatibility, especially in surgical cases with severe Bolton discrepancies or collapsed arches due to congenitally missing anterior teeth. These cases usually require expansion in both the sagittal and transverse plane to achieve normal arch compatibility. Arch compatibility can be achieved by either dentoalveolar or skeletal expansion or both. Orthodontically, dentoalveolar expansion can be achieved by means of expanded arch form, vertical loops, or an added assembly such as a quad helix or Ni-Ti expander from the palatal or lingual aspect of the arch. However, these modalities normally provide expansion along transverse plane. If any expansion along sagittal plane is required, then additional appliances such as TransForce or modifications in the appliance system (eg, a quad helix with extension on anterior teeth) are necessary. Vertical loops do overcome these drawbacks to a certain extent; however, at the expense of generating moments during preactivation, which may lead to tipping of segments adjacent to the loop and precludes its use for larger changes of arch dimension. This article describes a new loop design--the KD loop--that increases the arch perimeter by sagittal and transverse expansion without generating significant moments along vertical plane.","PeriodicalId":89450,"journal":{"name":"Orthodontics : the art and practice of dentofacial enhancement","volume":"13 1","pages":"e140-52"},"PeriodicalIF":0.0,"publicationDate":"2012-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"30601915","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

Association between orthodontic treatment need and masticatory performance. 正畸治疗需求与咀嚼功能的关系。

Orthodontics : the art and practice of dentofacial enhancement Pub Date : 2012-01-01

Behnam Khosravanifard, Sepideh Ghanbari-Azarnir, Hamid Rakhshan, Seyed Hadi Sajjadi, Annahita M Ehsan, Vahid Rakhshan

{"title":"Association between orthodontic treatment need and masticatory performance.","authors":"Behnam Khosravanifard, Sepideh Ghanbari-Azarnir, Hamid Rakhshan, Seyed Hadi Sajjadi, Annahita M Ehsan, Vahid Rakhshan","doi":"","DOIUrl":"","url":null,"abstract":"Aim: This retrospective cohort study assessed the differences between the masticatory performance of individuals with and without orthodontic treatment need.Methods: Masticatory performances of 120 participants with equal numbers of males and females (n = 60 each) with and without treatment need (n = 60 each, determined using the index of the complexity, outcome, and need [ICON]) matched by age and sex were assessed. Participants chewed on test foods at sequences of 20, 30, 40, 40, 30, and 20 masticatory cycles. After sieving the chewed particles, the masticatory parameters (median particle size [MPS], masticatory frequency [MF], and broadness of particle distribution [BPD]) were calculated. The associations between treatment need and the MPS with age, weight, and stature, as well as the relationship between sex and MPS and MF, were assessed.Results: According to the independent samples t test, MPS of subjects with and without treatment need differed significantly (P < .05) while MF did not. The differences between BPD values reached the level of significance only after 40 cycles of mastication (P < .05). Females showed significantly greater MPS values. Only at the 40-cycle sequence did females in need of treatment chew significantly slower. According to the repeated-measures ANOVA, no significant differences existed (P > .05) between each of the MPS, MF, and BPD values measured at different sequences. No significant correlations were found between MPS and age, sex, or stature (P > .05 [Spearman correlation coefficient]).Conclusion: The masticatory performance of individuals with and without treatment need differed for MPS and BPD (at the 40-cycle sequence). Age, weight, and stature did not affect the treatment need and MPS. Females showed poorer results regarding MPS--only at the 40-cycle sequence did females with malocclusion chew significantly slower.","PeriodicalId":89450,"journal":{"name":"Orthodontics : the art and practice of dentofacial enhancement","volume":"13 1","pages":"e20-8"},"PeriodicalIF":0.0,"publicationDate":"2012-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"30602376","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

Internal marketing: developing a patient-based practice. 内部营销:发展以患者为基础的实践。

Orthodontics : the art and practice of dentofacial enhancement Pub Date : 2012-01-01

Andrea Cook

引用次数: 0

New perspective on Herbst therapy for skeletal Class II malocclusions: a proposal for maxillary protrusion management. 骨ⅱ类错颌的草药治疗新进展:上颌前突治疗建议。

Orthodontics : the art and practice of dentofacial enhancement Pub Date : 2012-01-01

Leopoldino Capelozza Filho, Danilo Furquim Siqueira, Renata Cristina Faria Ribeiro de Castro, Tien-Li An, Mauricio de Almeida Cardoso

{"title":"New perspective on Herbst therapy for skeletal Class II malocclusions: a proposal for maxillary protrusion management.","authors":"Leopoldino Capelozza Filho, Danilo Furquim Siqueira, Renata Cristina Faria Ribeiro de Castro, Tien-Li An, Mauricio de Almeida Cardoso","doi":"","DOIUrl":"","url":null,"abstract":"Angle Class II malocclusions may present morphologic deviations originated from the maxilla, mandible, or both. Since its reintroduction by Pancherz, the Herbst appliance has demonstrated effectiveness in the management of patients with mandibular deficiency. Because of the intermaxillary anchorage, the action of mandibular advancement provokes simultaneous reaction of maxillary restriction, similar to high-pull headgear. This aimed of this report is to compare two cases treated in two phases. In the first interceptive phase, the transverse problem was corrected by rapid maxillary expansion, which was followed by a Herbst appliance for mandibular advancement; in the second corrective phase, the cases were finished with fixed appliances. Although Herbst appliances were used in both patients, one patient with maxillary protrusion and another with mandibular deficiency, their use targeted different types of skeletal discrepancies. This difference allowed for the comparison of treatment effects, and although both patients had their malocclusion corrected, it seems reasonable to conclude that the final outcome was more favorable for the patient with maxillary protrusion.","PeriodicalId":89450,"journal":{"name":"Orthodontics : the art and practice of dentofacial enhancement","volume":"13 1","pages":"e188-207"},"PeriodicalIF":0.0,"publicationDate":"2012-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"30602375","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 Orthodontic Plaque Index: an oral hygiene index for patients with multibracket appliances. 正畸菌斑指数:多托槽矫治器患者的口腔卫生指数。

Orthodontics : the art and practice of dentofacial enhancement Pub Date : 2012-01-01

Katrin Beberhold, Anika Sachse-Kulp, Rainer Schwestka-Polly, Else Hornecker, Dirk Ziebolz

{"title":"The Orthodontic Plaque Index: an oral hygiene index for patients with multibracket appliances.","authors":"Katrin Beberhold, Anika Sachse-Kulp, Rainer Schwestka-Polly, Else Hornecker, Dirk Ziebolz","doi":"","DOIUrl":"","url":null,"abstract":"Adhesively bonded, fixed orthodontic appliances--so-called multibracket appliances--on buccal or lingual tooth surfaces can make oral hygiene difficult. This increases the risk of caries and gingivitis, and patients require closely monitored prophylactic care. Oral hygiene indices serve to assess the oral hygiene situation and evaluate oral health status. The currently available indices do not adequately meet the special requirements of patients with multibracket appliances, since they evaluate only the smooth surfaces and/or approximal spaces of the teeth in terms of plaque accumulation and signs of inflammation of the marginal gingiva. The Orthodontic Plaque Index (OPI) is a special index for patients with fixed orthdontic appliances. The OPI focuses on the tooth area in the immediate vicinity of the bracket, since additional and relatively inaccessible plaque niches arise at these sites. To record the OPI, the dentition is divided into sextants. Plaque scores (0 to 4) are assigned. The plaque accumulation on each tooth surface adjacent to the bracket base is evaluated (mesial, distal, occlusal/incisal, and cervical). In addition, signs of gingival inflammation are recorded. The highest score per sextant is entered into a sextant table. Increased risk of caries and gingivitis is assumed as of score 3. The OPI can be used for both buccal and lingual multibracket appliances. In patients with fixed orthodontic apppliances, the OPI assesses oral hygiene in the bracket vicinity and thus provides differential findings. As a result, the OPI is recommended for clinical use.","PeriodicalId":89450,"journal":{"name":"Orthodontics : the art and practice of dentofacial enhancement","volume":"13 1","pages":"94-9"},"PeriodicalIF":0.0,"publicationDate":"2012-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"30603666","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

Treatment of a Class II subdivision based on occlusal plane control: a clinical case. 基于咬合平面控制的II类细分的治疗:一个临床病例。

Orthodontics : the art and practice of dentofacial enhancement Pub Date : 2012-01-01

Teresa Pinho

引用次数: 0

Evaluation of the stresses generated by altering the bracket mesh base design in the bracket-cement-tooth continuum using the finite element method of stress analysis. 采用应力分析的有限元方法对支架-水泥-牙齿连续体中改变支架网架设计所产生的应力进行了评估。

Orthodontics : the art and practice of dentofacial enhancement Pub Date : 2012-01-01

Tarulatha R Shyagali, Chandralekha Basavaraj Urs, Shashikala Subramai, Deepak P Bhayya

{"title":"Evaluation of the stresses generated by altering the bracket mesh base design in the bracket-cement-tooth continuum using the finite element method of stress analysis.","authors":"Tarulatha R Shyagali, Chandralekha Basavaraj Urs, Shashikala Subramai, Deepak P Bhayya","doi":"","DOIUrl":"","url":null,"abstract":"Aim: To analyze the influence of bracket base mesh geometry on the stresses generated in the tooth-cement-bracket continuum by a shear/peel load case and to compare the stress generated by three different loads (masticatory, peel, and twisting) on the bracket mesh base by employing a three-dimensional (3D) finite element computer model.Methods: A validated 3D finite element model of the bracket-cement-tooth system was constructed consisting of 40,536 nodes and 49,201 finite elements.Results: An increase in the diameter of the bracket mesh base wire resulted in a decrease in the stress at the enamel and cement. Increase in wire spacing (200 to 500 mm) increased the stresses in the enamel and cement at all wire diameters, but within the impregnated wire mesh, the major stress decreased with the increase in the wire spacing. Peel load produced comparatively less stress on enamel than masticatory and twisting force.Conclusion: Alteration in mesh spacing and wire diameter influences the magnitude and distribution of stresses within the bracket-cement-tooth continuum. Peel load and twisting load are best to debond the bracket since they produced minimal stress on the enamel, which is suggestive of lower chances of enamel damage.","PeriodicalId":89450,"journal":{"name":"Orthodontics : the art and practice of dentofacial enhancement","volume":"13 1","pages":"e66-75"},"PeriodicalIF":0.0,"publicationDate":"2012-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"30601787","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

Alternative methods for evaluating the equivalence of measurement systems. 评估测量系统等效性的替代方法。

Orthodontics : the art and practice of dentofacial enhancement Pub Date : 2012-01-01

David W Chambers

{"title":"Alternative methods for evaluating the equivalence of measurement systems.","authors":"David W Chambers","doi":"","DOIUrl":"","url":null,"abstract":"Aim: Reports are common in the orthodontic and dental radiographic literature comparing measurement systems. Typically, such comparisons are made using differences in mean scores across methods, correlation coefficients, or Bland-Altman plots. These methods are subject to known limitations, including an inability to detect bias.Methods: A hypothetical dataset was created to contain a small, common random variance and two types of bias to compare three alternative measurement systems against a common standard. One comparison included only random error and no bias. Two types of bias were investigated: systemic overestimation on the part of one measurement system and the more complex case of overestimation in one part of the range and underestimation in the other.Results: Each of the commonly used methods for comparing alternative measurement systems was inadequate for detecting one or the other type of bias. The traditional regression analysis, by contrast, provided a useful characterization of the alternative measurement systems, including quantification of the nature of bias.Conclusion: Regression analysis can reveal biases masked in the common comparison of means, correlation coefficients, and Bland-Altman plots for evaluating alternative measurement systems and thereby improve confidence in clinical applicability of research.","PeriodicalId":89450,"journal":{"name":"Orthodontics : the art and practice of dentofacial enhancement","volume":"13 1","pages":"192-9"},"PeriodicalIF":0.0,"publicationDate":"2012-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"30602025","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

External apical root resorption in retracted incisors. 后缩门牙的外根尖吸收。

Orthodontics : the art and practice of dentofacial enhancement Pub Date : 2012-01-01

Hallissa Simplicio, Jose Sandro Pereira da Silva, Sergei Godeiro Fernandes Rabelo Caldas, Ary dos Santos-Pinto

{"title":"External apical root resorption in retracted incisors.","authors":"Hallissa Simplicio, Jose Sandro Pereira da Silva, Sergei Godeiro Fernandes Rabelo Caldas, Ary dos Santos-Pinto","doi":"","DOIUrl":"","url":null,"abstract":"Aim: To evaluate the occurrence of external apical root resorption (EARR) in the incisors after anterior retraction in corrective orthodontic treatment with first premolar extractions and whether it was related with the type of root apex movement and its inclination.Method: The maxillary and mandibular incisors of 22 patients (12 to 25 years of age; 9 males and 13 females) were treated with fixed appliances and premolar extraction. EARR was defined as the difference in root length before and after incisal retraction on periapical radiographs. Distortion of radiographic images and changes due to incisal tipping were controlled for. Pre- and post-incisal retraction lateral cephalometric radiographs established the relationship between EARR and the tipping of the incisors, along with the vertical, horizontal, and total movement of the root apex.Results: There was significant EARR (1.51 to 2.37 mm) during incisor retraction, but this was not related to the movement or the tipping of the root apex of almost all teeth. It was observed that after the retraction stage, EARR occurred in all evaluated incisors, but it was more significant (P < .05) in the mandibular right lateral incisor.Conclusion: The EARR that did occur was unrelated to movement or tipping of the root apex, except for the vertical root apex movement of the mandibular left central incisor and the inclination of the maxillary right lateral incisor.","PeriodicalId":89450,"journal":{"name":"Orthodontics : the art and practice of dentofacial enhancement","volume":"13 1","pages":"86-93"},"PeriodicalIF":0.0,"publicationDate":"2012-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"30602160","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