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1.
J Contemp Dent Pract ; 21(4): 416-420, 2020 Apr 01.
Artigo em Inglês | MEDLINE | ID: mdl-32584279

RESUMO

PURPOSE: This study aimed to investigate the effectiveness of using bite wafers and chewing gum in relieving pain after the activation of the first archwire among Saudi orthodontic patients and evaluating them in comparison with ibuprofen use. Furthermore, the study investigated the effect of chewing gum and plastic wafers on the frequency of orthodontic appliance breakage. MATERIALS AND METHODS: A total of 105 female patients aged 15-35 years, undergoing maxillary and mandibular fixed appliance treatment were classified randomly into three groups of 35 each. In each group, the patients were given one of the following treatments immediately after the placement of the first archwire, every 8 hours for 1 week as needed: ibuprofen (400 mg), or a viscoelastic bite wafer, or chewing gum. A visual analog scale was given to the patients to record their pain perception following initial archwire placement. In addition, the patients were asked to report any incidence of detached brackets while using the above methods. Data were analyzed using analysis of variance (ANOVA). RESULTS: No statistically significant differences were found in pain perception at any time interval among the three groups. The pain experienced at bedtime and 24 hours after wire placement among different groups in the present study was found to be slightly higher with maximum intensity and the pain perception finding at different time intervals within each pain relief method was statistically significant (p = 0.000, p < 0.05). Furthermore, ANOVA results demonstrate no significant differences in bracket detachment between the groups (p = 0.20, p < 0.05). CONCLUSION: The use of bite wafers and chewing gum was effective and comparable to ibuprofen use for pain relief following the initial activation of fixed orthodontic appliances among Saudi orthodontic patients. In addition, the study found no clinically or statistically significant differences in bracket detachment between the groups. CLINICAL SIGNIFICANCE: The nondrug modalities of controlling pain such as chewing gum and/or bite wafers can be used as an alternative to ibuprofen use following the first activation of fixed orthodontic appliances.


Assuntos
Analgésicos não Entorpecentes , Goma de Mascar , Ibuprofeno , Fios Ortodônticos , Manejo da Dor , Adolescente , Adulto , Feminino , Humanos , Dor , Medição da Dor , Adulto Jovem
2.
Prog Orthod ; 21(1): 22, 2020 Jun 29.
Artigo em Inglês | MEDLINE | ID: mdl-32596755

RESUMO

BACKGROUND: Long-term retention with fixed retainers with a high success rate seems to be a reasonable solution to minimize or prohibit relapse of orthodontic treatment. METHODS: Two hundred sixty patients between 13 and 30 years old were recruited for this study. The 0.0175 stainless steel twisted wire (G&H Orthodontics, USA) was compared with a single-strand ribbon titanium lingual retainer wire (Retainium, Reliance orthodontics, USA) was used. When treatment was completed, the retainers were bonded from canine to canine in the mandibular arch of the participants. In the follow-up visits, the patients were recalled every 3 months during the 24 months. Detachments, the time of debonding, and side effects were recorded. Statistical analysis was performed by a blinded statistician using a statistical package for Social Science (SPSS, Version20). After descriptive statistics, Kaplan-Meier analysis was performed to measure the survival rates of each retainer. P value < 0.05 was considered as significant. RESULTS: Finally, 138 patients who received twisted wire splint and 112 patients who received ribbon wire were included in the analysis. The average duration of success was about 23 months for twisted wire and ribbon wire, according to the Kaplan-Meier estimates. The analysis showed no significant overall difference between the treatments (p = 0.13). Failure rates in terms of detachments in all groups occurred at the enamel junction, and it was 25 in twisted retainer group (18.1%) and was 10 in ribbon retainer group (8.9%); the Kaplan-Meier analysis test detected a significant difference in the failure rates between the groups (p = 0/006). CONCLUSIONS: Although the conventional twisted stainless steel wire and single-strand titanium flat metal ribbon wire as fixed orthodontic retainers have the same clinical effects, it was shown that the ribbon wire has less failure in terms of detachments.


Assuntos
Colagem Dentária , Fios Ortodônticos , Adolescente , Adulto , Humanos , Desenho de Aparelho Ortodôntico , Aparelhos Ortodônticos Fixos , Contenções Ortodônticas , Aço Inoxidável , Adulto Jovem
4.
J Clin Pediatr Dent ; 44(2): 123-126, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32271662

RESUMO

A modified pontic technique is presented that simplifies the management of patients with missing anterior teeth during the course of comprehensive orthodontic care. This technique demonstrates a lingual arch attached to lingual sheaths with the pontic placed on the lingual arch. Information presented includes appliance design, improved bond strength of the bracket on the pontic tooth, preparing the appliance for use as anchorage, and the incorporation of an anterior biteplate in the appliance. A modified pontic appliance improves esthetics and function when treating patients with missing maxillary anterior teeth.


Assuntos
Incisivo , Procedimentos de Ancoragem Ortodôntica , Prótese Parcial Fixa , Estética Dentária , Humanos , Desenho de Aparelho Ortodôntico , Fios Ortodônticos , Técnicas de Movimentação Dentária
5.
J Dent Educ ; 84(3): 377-384, 2020 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-32176338

RESUMO

The aims of this study were to evaluate the effects of a live-video teaching tool on the performance of dental students in bending an orthodontic vestibular arch and to assess the students' perceptions of the technology. All 135 fourth-year dental students in the 2018 academic year at Hacettepe Dental School, Ankara, Turkey, were invited to participate in the study; after exclusions, the remaining 116 were randomly divided into two demonstration cohorts. These students had no prior experience bending an orthodontic wire. Cohort 1 (control, N=58) was shown a conventional live demonstration of the orthodontic bending of a vestibular arch, and Cohort 2 (experimental, N=58) was shown a live-video demonstration of the same procedure. Both cohorts saw the demonstration before beginning the exercise and were evaluated afterwards on their performance of the procedure. In addition, the students' perceptions of the demonstration techniques were collected with a questionnaire. The results did not show any significant differences in the students' bending scores between the control and experimental cohorts (p=0.767). The median values on the questionnaire indicated almost no statistically significant difference in responses between the cohorts. The only significant difference was that Cohort 1 had a higher percentage who answered "yes" they would like to rewatch the demonstration than did Cohort 2 (p=0.024). In this study, the live-video technique was found to be as effective as a conventional live demonstration for orthodontic practical education, suggesting that either technique could be used as an appropriate method for training in orthodontic wire bending.


Assuntos
Educação em Odontologia , Fios Ortodônticos , Estudantes de Odontologia , Estudos de Coortes , Humanos , Faculdades de Odontologia , Inquéritos e Questionários , Gravação em Vídeo
6.
Am J Orthod Dentofacial Orthop ; 157(3): 320-328, 2020 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-32115110

RESUMO

INTRODUCTION: This study compared three-dimensional forces delivered to the displaced tooth and its adjacent teeth between passive self-ligation (PSL) and conventional elastic ligation (CL) in simulation of mandibular lateral incisor linguoversions. METHODS: A multisensor system was used to measure three-dimensional forces delivered to brackets attached to the mandibular left central incisor, lateral incisor, and canine (FDI tooth numbers 31, 32, and 33, respectively). Two ligation methods (PSL and CL), 3 nickel-titanium (0.014-inch) archwires similar to the arch form of normal occlusion, and 2 displacements (1 and 4 mm) were tested. RESULTS: In 1-mm displacement, forces were significantly smaller in CL than in PSL at 32 in the labial direction and larger at 31 in the mesial direction for all 3 types of archwires (P <0.01 for both). For 2 of 3 archwires, forces were larger in CL than in PSL at 33 in the lingual direction (P <0.01). In 4-mm displacement, forces were significantly larger in CL than in PSL at 31 in the mesial direction and significantly smaller in CL than in PSL at 33 in the distal direction for all 3 archwires (P <0.05 and P <0.01, respectively). Mean forces in the vertical direction were small, ranging from -0.05 to 0.05 N. CONCLUSIONS: Under a small amount of displacement, force magnitude in PSL was smaller than that in CL at the displaced tooth in labial-lingual directions. Under a large amount of displacement, a more "open coil spring effect" was significantly obtained in CL than PSL at both adjacent teeth of the displaced tooth.


Assuntos
Incisivo , Braquetes Ortodônticos , Técnicas de Movimentação Dentária , Ligas Dentárias , Análise do Estresse Dentário , Humanos , Desenho de Aparelho Ortodôntico , Fios Ortodônticos , Titânio
7.
Dental Press J Orthod ; 25(1): 47-55, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32215477

RESUMO

INTRODUCTION: Several advantages have been established regarding the efficiency of self-ligating brackets (SL). In spite of some controversy surrounding this question in the literature, clinical results confirm that "arch development" requires fewer extractions. OBJECTIVE: The objective of this study was to compare changes in the transverse and sagittal planes in patients treated with conventional ligating brackets (CL)as well as in patients treated with SL brackets and oversized arches. METHODS: A sample was selected from a pool of 300 consecutive cases treated by a single clinician: 51 patients with SL brackets and oversized wires, and 55 with CL brackets. These two groups were compared with a control group of 20 patients. All plaster models were scanned and dental landmarks were measured to identify changes from commencement (T0) to conclusion (T1) of treatment. Lateral cephalograms were analyzed for changes in the lower incisor (IMPA) and the first lower molar distal angulation (MAng). Intraoperator reliability was tested with linear regression analysis. To assure all groups were comparable at T0, an ANOVA test with a 95%confidence interval (CI) was performed for all values. To assess changes from T0 to T1 in all groups, a Student's t-test with 95% CI was used. Finally, results from the three groups were compared using an ANOVA-test (95% CI) and a post-hoc test. RESULTS: Increases in all the transverse variables were recorded in the two groups treated (SL and CL), except for the lower intercanine distance in the SL group. IMPA difference from T0 to T1 was higher in the CL group, and molar distal angulation (MAng) took place in the SL group. CONCLUSIONS: Self-ligating brackets with oversized arches and conventional ligating brackets showed increases in all variables in the transverse plane, except for the SL group at the mandibular intercanine distance. In comparison with the CL group, fewer different IMPA values were observed in the SL group, in which distal molar angulation occurred.


Assuntos
Braquetes Ortodônticos , Fios Ortodônticos , Humanos , Incisivo , Desenho de Aparelho Ortodôntico , Reprodutibilidade dos Testes
8.
Dental Press J Orthod ; 25(1): 64-69, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32215479

RESUMO

OBJECTIVE: This study proposed to investigate the influence of catastrophizing and others factors related to pain during orthodontic treatment. METHODS: 27 patients with 0.022 x 0.028-in Straight-wire brackets were evaluated during alignment and leveling phase with nickel-titanium wires. Visual Analog Scales measured the intensity of orthodontic pain at six moments after a clinical appointment: 6 first hours; 1, 2, 3, 5, and 7 days. Multiple linear regression and stepwise approach assessed the influence of the following variables on pain: catastrophizing, sex, age, duration of treatment, clinical appointment time (morning or afternoon), and wire diameter. RESULTS: The highest pain intensity was reported 24 hours after activation. These data were used to analyze factors associated with pain level. Age (r = 0.062, p= 0.7586), sex (p= 0.28), catastrophizing (r = -0.268, p= 0.1765), and orthodontic wire diameter (r = 0.0245, p= 0.2181) were not correlated with orthodontic pain in the univariate statistics. Catastrophizing was included in the multiple regression model because it was of great interest. Duration of orthodontic treatment (r = 0.6045, p= 0.0008) and the time when orthodontic appliance was activated (p= 0.0106) showed statistical significant associations with pain, and were also included in the multivariate regression, which showed that about 32% of orthodontic pain could be explained by the duration of treatment (R2= 0.32, p= 0.0475). Catastrophizing (R2= 0.0006, p= 0.8881) and clinical appointment time were not significantly associated with pain (R2= 0.037, p= 0.2710). CONCLUSIONS: Pain after activation of fixed orthodontic appliance is not associated with catastrophizing as well as age, sex, orthodontic wire diameter, and period of activation.


Assuntos
Braquetes Ortodônticos , Catastrofização , Ligas Dentárias , Humanos , Desenho de Aparelho Ortodôntico , Fios Ortodônticos , Dor , Titânio
9.
Am J Orthod Dentofacial Orthop ; 157(1): 128-131, 2020 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-31901270

RESUMO

Preservation of the maxillary lateral incisor space after orthodontic treatment in an adolescent patient traditionally requires the use of a retainer with a lateral pontic, commonly referred to as a "flipper," which is minimally effective in the long term. This article illustrates a technique for chairside fabrication of a Maryland bridge retainer for semi-permanent retention. A stainless steel braided palatal wire is bonded to the anterior teeth. A pontic is then built intraorally with flowable composite, using the palatal wire as scaffolding. The retainer is maintained until the patient is of age for a more permanent restoration.


Assuntos
Prótese Adesiva , Adolescente , Humanos , Desenho de Aparelho Ortodôntico , Contenções Ortodônticas , Fios Ortodônticos
10.
Pediatrics ; 145(1)2020 01.
Artigo em Inglês | MEDLINE | ID: mdl-31831671

RESUMO

Mental health disorders in adolescents present some of the most challenging of all ethical dilemmas. This is particularly true when they lead to self-injurious behavior that can only be prevented by either limiting the freedom of the adolescent or forcing treatments on them that they do not want. Intentional and repeated foreign-body ingestion (FBI) in youth is a poorly understood self-injurious behavior that can be life-threatening. It poses unique clinical and ethical challenges. Ingestion of sharp or magnetic objects increases the need for endoscopic retrieval or surgical intervention with associated risks, including perforation and anesthesia-related adverse events. When behavior modification efforts fail to prevent recurrent FBI, the cumulative risk of medical intervention mounts. Sometimes, as a last resort, doctors consider surgical procedures that limit jaw movement and may physically prevent recurrent FBI. In this Ethics Rounds article, we present a case in which doctors consider whether it is in the best interest of a teenager with this behavior to undergo orthodontic jaw wiring as a next step in treatment of repeated FBI. Doctor commentary on the ethical decision-making process is provided.


Assuntos
Corpos Estranhos/prevenção & controle , Fios Ortodônticos/ética , Ortodontia/ética , Comportamento Autodestrutivo/prevenção & controle , Adolescente , Temas Bioéticos , Corpos Estranhos/complicações , Corpos Estranhos/diagnóstico por imagem , Gastroenterologia/ética , Humanos , Masculino , Autonomia Pessoal , Recidiva , Prevenção Secundária/ética , Prevenção Secundária/métodos , Comportamento Autodestrutivo/psicologia
11.
Prog Orthod ; 20(1): 46, 2019 Dec 16.
Artigo em Inglês | MEDLINE | ID: mdl-31840204

RESUMO

BACKGROUND: To compare the clinical efficiency of premium heat-activated copper nickel-titanium (Tanzo Cu-NiTi) and NT3 superelastic NiTi during initial orthodontic alignment. SUBJECT AND METHODS: A total of 50 patients were randomly allocated to 1 of 2 different archwire types (group 1, Tanzo Cu-NiTi; group 2, NT3 superelastic NiTi). Eligibility criteria included Class I or Class II malocclusion, moderate maxillary anterior crowding, and healthy periodontal condition. Impressions of the upper arches were taken before archwire placement (T0) and at every 4 weeks (T1, T2, T3, and T4). For T1 and T2 stages, 0.014-in., and for T3 and T4 stages, 0.018-in. archwires were used. The primary outcome was the alignment efficiency assessed using Little's irregularity index. The secondary outcomes were arch width and incisor inclination changes. Data were analyzed using independent samples t test, repeated measures ANOVA, and Mann-Whitney U test. Marginal models were established for the estimation of coefficients. RESULTS: The anterior irregularity index reduction was mostly observed between T0 and T2 periods, which were respectively - 7.40 ± 0.50 mm (p < 0.001; 95% CI, - 8.94, - 5.85) and - 6.80 ± 0.55 mm (p < 0.001; 95% CI, - 8.49, - 5.12) for groups 1 and 2 (p < 0.001). With both wires, Little's irregularity index decreased over time, and the difference between the groups was not significant (p = 0.581; estimated effect size, 0.011). No statistically significant difference was found between the groups in terms of intercanine and intermolar width and incisor inclination changes. CONCLUSION: There were no significant between-group differences in alignment efficiency, arch width, and incisor inclination change. There was an increased alignment with 0.014-in. compared with 0.018-in. diameter archwire.


Assuntos
Níquel , Titânio , Adolescente , Cobre , Ligas Dentárias , Temperatura Alta , Humanos , Fios Ortodônticos
12.
Minerva Stomatol ; 68(5): 265-272, 2019 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-31822051

RESUMO

BACKGROUND: This study aims to evaluate tension distribution in the anterior region of the mandible during two orthodontic mechanical approaches to treat anterior open bite. METHODS: It was an in-vitro experimental study, that analyzed 5 models of photoelastic resin, simulating a lower dental arch. The anterior teeth underwent orthodontic forces of the Blue Elgiloy® 0.016" x 0.022" (MEAW technique) and Gummetal® 0.018"x 0.022" (GEAW technique) archwires. Tension distribution was assessed on three different points in the lower dental midline and was measured using a reflection polariscope. The archwires were evaluated with and without anterior elastic bands (6 oz, 170 g) installed between lateral incisors and lower canines, as recommended for anterior open bite. RESULTS: The highest magnitudes of tension generated by the archwires were observed in the cervical regions of the teeth (on average 50% higher than those at the most apical point) regardless of the technique used. Comparatively, the GEAW technique showed significantly (P<0.05) lower tension values (16 MPa) than the MEAW technique using Blue Elgiloy (24 MPa). CONCLUSIONS: The GEAW technique showed a more favorable tension distribution pattern than the MEAW approach. The use of elastic bands improved tension distribution, regardless of the technique. The results also suggest that the use of anterior elastic bands in both techniques reduced the tensions released by the intrusive forces generated by the archwires.


Assuntos
Mordida Aberta , Humanos , Incisivo , Mandíbula , Desenho de Aparelho Ortodôntico , Fios Ortodônticos , Técnicas de Movimentação Dentária
13.
Am J Orthod Dentofacial Orthop ; 156(6): 870-877, 2019 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-31784021

RESUMO

INTRODUCTION: This study aimed to evaluate the ability of dental clinicians to predict posttreatment dental arch forms in patients with malocclusion with the aid of 3D imaging and digital software in comparison with a conventional method. METHODS: Pretreatment and posttreatment dental plaster casts of 100 patients (200 maxillary models and 200 mandibular models) were selected. Three orthodontists selected the best-fitted archwires among 5 commercially available preformed nickel-titanium archwires using 2 methods. In the conventional method, they fit the archwires to pretreatment casts, and in the digital method, they fit the scanned wire to a 3D digital model, using Ortho-Aid, a locally developed 3D software, using clinical bracket points as reference for wire fitness. The predicted posttreatment archwire in each method was compared with the best-fit archwire on the actual posttreatment model of each patient in both methods, and the level of agreement was calculated. The interobserver agreement between the 3 orthodontists in each method was evaluated using intraclass correlation coefficient and the Dahlberg formula. RESULTS: Orthodontists predicted the final treatment outcome in 50% of cases using the conventional method and 58% using the digital method. However, the range of method error was significantly higher in the conventional method (0.425-3.853 mm for the conventional vs 0.451-0.584 mm for the digital). CONCLUSIONS: Although the clinicians' ability to predict the final dental arch form after orthodontic treatment and the agreement between clinicians increased by the use of digital equipment, orthodontists can predict the final arch form in about 60% of patients.


Assuntos
Arco Dental , Imageamento Tridimensional , Fios Ortodônticos , Ortodontia Corretiva , Ligas Dentárias , Arco Dental/anatomia & histologia , Arco Dental/diagnóstico por imagem , Modelos Dentários , Previsões , Humanos , Mandíbula , Software
14.
Am J Orthod Dentofacial Orthop ; 156(5): 611-616, 2019 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-31677669

RESUMO

INTRODUCTION: This study aimed to compare the microorganism adhesion on coated, partially coated, and uncoated orthodontic archwires after clinical use. The correlation between surface roughness (SR) and bacterial colonization was also evaluated. METHODS: A total of 48 archwire segments (0.016 × 0.022-in) were equally divided into 4 groups: nickel-titanium coated, nickel-titanium partially coated, uncoated stainless steel, and uncoated nickel-titanium. The archwires were randomly inserted in a split-mouth study design. After 4 weeks of clinical use, the total number of microorganisms adhering to the archwire was quantified and transformed into colony-forming units. SR was evaluated using a profilometer. A one-way and two-way ANOVA, post-hoc Tukey test, paired-samples t test, and Pearson correlation coefficient were used for statistical analysis. RESULTS: All the archwires presented microorganism adhesion, with the nickel-titanium-coated group demonstrating the highest value (P < 0.001). A statistically significant increase in SR was observed after clinical use for all groups (P < 0.05). No correlation between SR and bacterial adhesion was detected. CONCLUSIONS: Microorganism adhesion occurred on all of the archwires tested, especially on the esthetic fully coated. Because SR was not correlated with microorganism adhesion, future studies should evaluate the effect of surface free energy and superficial chemical changes on in-vivo microorganism adhesion.


Assuntos
Estética Dentária , Braquetes Ortodônticos , Fios Ortodônticos , Ligas Dentárias , Humanos , Teste de Materiais , Estudos Prospectivos , Aço Inoxidável , Propriedades de Superfície , Titânio
15.
Indian J Dent Res ; 30(4): 548-552, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31745051

RESUMO

Aim: The aim of this study was to evaluate and compare the surface characteristics of colored titanium molybdenum alloy archwires (purple-coated TMA and honey dew-coated TMA) and the regular titanium molybdenum alloy archwires. Materials and Methods: The experiment comprised three groups, Group I - regular TMA archwires, Group II - purple-coated TMA archwires, Group III - honey dew-coated TMA wires involving 21 samples each. The surface characteristics were assessed using scanning electron microscopy and optical profilometer. Results: The results were statistically analyzed using analysis of variance wherein Group I regular TMA wires exhibited a root mean square value of 148.071 nm and a standard deviation of 9.0027 nm followed by group II (purple-coated TMA wires) which showed a root mean square value of 84.095 nm with a standard deviation of 2.6005 nm, while group III (honey dew-coated TMA wires) was found to have a root mean square value of 71.681 nm with a standard deviation of 1.4645 nm on subjecting to optical profilometry. Conclusion: The surface roughness is higher for regular TMA wire exhibiting superior characteristic of color-coated TMA wires, especially honey dew-coated TMA wires over the regular and purple-coated TMA wires. This property of the archwires details regarding its application in both sliding and frictionless mechanics in retraction phase of fixed orthodontic treatment.


Assuntos
Fios Ortodônticos , Titânio , Ligas Dentárias , Teste de Materiais , Microscopia Eletrônica de Varredura , Aço Inoxidável , Propriedades de Superfície
16.
Microsc Res Tech ; 82(12): 2049-2053, 2019 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-31587442

RESUMO

Orthodontic brackets, specifically in their slots, are responsible for receiving active orthodontic forces and transferring them to the teeth to be moved. The presence of an altered slot or inaccurate dimensions can influence the mechanical relationship between the bracket and archwire, interfering with the biomechanics of tooth movement. The objective of this study was by comparing the accuracy of slot placement of upper right lateral incisor metal brackets for Bioprogressive Ricketts therapy from five trademarks. The following characteristics were evaluated: height, torque, and internal parallelism of the walls of the slot. The sample included 75 brackets, 15 each from the following trademarks: 3M Abzil, Forestadent, Morelli Rocky Mountain Orthodontics, and Tecnident. Images of the slot profiles were obtained through standardized techniques using scanning electron microscopy, measured by the AutoCAD 2017 software, and compared to Ricketts prescription, respecting standard deviation with the technical and tolerance parameters present in standard ISO 27020. The results indicated that most of the evaluated characteristics were in accordance with the standard parameters, considering the tolerance adopted. There were exceptions found to this pattern of precision in the 3M Abzil brackets with regard to torque variation, and the Morelli brackets in relation to height variation and parallelism between the walls of the slot. Considering the measured dimensional characteristics, the metal brackets used in Bioprogressive Ricketts therapy has satisfactory pattern accuracy; however, there are still some specific inaccuracies in brackets from certain brands that can require more attention during the detailing phase.


Assuntos
Análise do Estresse Dentário/métodos , Incisivo/fisiologia , Braquetes Ortodônticos , Ortodontia/métodos , Humanos , Teste de Materiais , Fios Ortodônticos , Aço Inoxidável , Estresse Mecânico , Propriedades de Superfície , Torque
17.
J Orofac Orthop ; 80(6): 304-314, 2019 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-31552447

RESUMO

PURPOSE: Torque control in lingual orthodontics is key to obtain optimal esthetic results. The aim of this in vitro experimental study was to verify the efficiency of the ligature-archwire-slot system in torque control using a customized lingual appliance. METHODS: An idealized cast with eight extracted human teeth was created and a set of customized lingual brackets was obtained. Tests were performed with the following wires: 0.016â€³â€¯× 0.022″ nickel-titanium (NiTi), 0.016â€³â€¯× 0.024″ stainless steel (SS), 0.017â€³â€¯× 0.025″ ßIII titanium (ßIIITi), 0.0182â€³â€¯× 0.0182″ ßIIITi, 0.018â€³â€¯× 0.025″ SS, 0.018â€³â€¯× 0.025″ NiTi, 0.018â€³â€¯× 0.025″ ßIIITi, and three types of ligatures were tested using a universal testing machine to calculate the efficiency in torque control. A blind statistical analysis was performed. RESULTS: Based on post hoc multiple comparisons, differences were found for two of the three ligatures when using the 0.016â€³â€¯× 0.022″ NiTi wires (p < 0.001 for both ligatures). When considering all ligatures, 0.018â€³â€¯× 0.025″ SS and 0.018â€³â€¯× 0.025″ ßIIITi were significantly different from all other wires (p < 0.001 in all cases). With a moment of 5 Nmm, the 0.016â€³â€¯× 0.022″ NiTi wire developed median angles of 26.7, 29.8, and 38.7° with the three ligatures, respectively, while the 0.018â€³â€¯× 0.025″ SS developed median angles of 12.9, 10.7, and 12.7°, respectively. CONCLUSIONS: The ligature type and geometry did not affect the efficiency of torque control, except for the 0.016â€³â€¯× 0.022″ NiTi wire. The wires generating the greatest moments were the 0.018â€³â€¯× 0.025″ SS and 0.018â€³â€¯× 0.025″ ßIIITi.


Assuntos
Braquetes Ortodônticos , Fios Ortodônticos , Ligas Dentárias , Análise do Estresse Dentário , Estética Dentária , Humanos , Teste de Materiais , Desenho de Aparelho Ortodôntico , Titânio , Torque
18.
Am J Orthod Dentofacial Orthop ; 156(3): 401-411, 2019 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-31474270

RESUMO

A 24-year-old man presented with a severe skeletal class III malocclusion, associated with an anterior and posterior crossbite in the left side, upper and lower lip eversion, skeletal asymmetry, midline discrepancy, diastemas in the maxillary and mandibular dental arches, and agenesis of maxillary lateral incisors and canines with retained deciduous teeth. Treatment was performed with the use of the Win Lingual System. When the 0.016 × 0.022-inch NiTi archiwire was applied, the deciduous teeth were extracted and replaced with temporary crowns connected to the appliance. After the aligning, leveling, and diastema closure phases, a modified Le Fort II osteotomy, a mandibular setback with a bilateral sagittal split osteotomy and a genioplasty were performed. Implants were placed in the canine site through a flapless guided surgery, and cantilevered temporary bridges were delivered. Final prosthetic rehabilitation included veneers for the central incisors and zirconia-ceramic cantilevered bridges for the canine and lateral incisors. After 36 months of active treatment, the patient showed an Angle Class I molar and canine relationship and an ideal overbite and overjet. His profile had improved, lips were competent, and gingival levels were acceptable. The lateral radiograph and cephalometric analysis showed a good balance of the skeletal pattern, a good profile of the soft tissue, and proper inclinations of the maxillary and mandibular incisors in relation to maxilla and mandible. After 2 years of follow-up, the patient had a pleasant smile and no relapse, or joint or muscular pain.


Assuntos
Anodontia/complicações , Má Oclusão de Angle Classe III/terapia , Desenho de Aparelho Ortodôntico/instrumentação , Desenho de Aparelho Ortodôntico/métodos , Aparelhos Ortodônticos , Adulto , Cefalometria , Dente Canino , Implantação Dentária Endo-Óssea , Implantes Dentários , Modelos Dentários , Diastema/cirurgia , Diastema/terapia , Estética Dentária , Humanos , Incisivo , Lábio , Masculino , Má Oclusão de Angle Classe I/complicações , Má Oclusão de Angle Classe III/diagnóstico por imagem , Má Oclusão de Angle Classe III/reabilitação , Má Oclusão de Angle Classe III/cirurgia , Mandíbula/cirurgia , Maxila/cirurgia , Dente Molar , Procedimentos de Ancoragem Ortodôntica/instrumentação , Procedimentos de Ancoragem Ortodôntica/métodos , Braquetes Ortodônticos , Fios Ortodônticos , Osteotomia , Sobremordida/terapia , Radiografia Panorâmica , Técnicas de Movimentação Dentária/instrumentação , Técnicas de Movimentação Dentária/métodos , Adulto Jovem
19.
Dent Mater J ; 38(6): 909-920, 2019 Dec 01.
Artigo em Inglês | MEDLINE | ID: mdl-31366769

RESUMO

Corrosion of metallic materials in the oral cavity could trigger metal allergy in patients. To clarify the risk elevation of magnetic fields (MFs) exposure on metallic corrosion when combined with fluoride-containing dental care products and indigenous oral bacteria, we investigated electric toothbrush-derived MF-induced corrosion of orthodontic stainless steel (SUS) and nickel titanium (Ni-Ti) wires in the presence of fluoride and oral bacteria, i.e. Streptococcus (S) mutans and S. sanguinis. MFs induced an electric current in the wires under both environments. Oral bacteria corroded SUS wires, and fluoride corroded SUS and Ni-Ti wires as previously reported; however, no additive or synergistic effects of MF exposure on fluoride- and microbiologically-induced metallic corrosion were observed. These results suggest that the MFs from electric toothbrushes do not increase the risk of corrosion of metallic appliances, given that the oral environment of patients is exposed to oral bacteria and fluoride-containing products.


Assuntos
Fluoretos , Fios Ortodônticos , Bactérias , Corrosão , Ligas Dentárias , Humanos , Campos Magnéticos , Teste de Materiais , Propriedades de Superfície , Titânio
20.
Am J Orthod Dentofacial Orthop ; 156(2): 210-219, 2019 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-31375231

RESUMO

INTRODUCTION: More patients are choosing customized orthodontic appliances because of their excellent esthetics. It is essential that clinicians understand the biomechanics of the tooth movement tendency in customized lingual orthodontics. This study aimed to evaluate the tooth movement tendency during space closure in maxillary anterior teeth with the use of miniscrew anchorage in customized lingual orthodontics with various power arm locations. METHODS: Three-dimensional finite element models of the maxilla were created with miniscrews and power arms; the positions were varied to change the force directions. A retraction force (1.5 N) was applied from the top of the miniscrews to the selected points on the power arm, and the initial displacements of the reference nodes of the maxillary teeth were analyzed. RESULTS: After applying force in different directions, power arms located at the distal side of the canines led to larger initial lingual crown tipping and occlusal crown extrusion of the maxillary incisors compared with power arms located at the midpoint between the lateral incisors and canines, and caused a decreasing trend of the intercanine width. CONCLUSIONS: In customized lingual orthodontic treatment, power arms located at the distal side of the canines are unfavorable for anterior teeth torque control and intercanine width control. Power arms located at the midpoint between the lateral incisors and canines can get better torque control, but still cannot achieve excepted torque without extra torque control methods, no matter whether its force application point is higher than, lower than, or equal to the level of the top of the miniscrews.


Assuntos
Parafusos Ósseos , Análise de Elementos Finitos , Procedimentos de Ancoragem Ortodôntica/instrumentação , Procedimentos de Ancoragem Ortodôntica/métodos , Fechamento de Espaço Ortodôntico , Técnicas de Movimentação Dentária/instrumentação , Técnicas de Movimentação Dentária/métodos , Adulto , Fenômenos Biomecânicos , Simulação por Computador , Dente Canino/patologia , Humanos , Imageamento Tridimensional/métodos , Incisivo/patologia , Maxila , Modelos Biológicos , Desenho de Aparelho Ortodôntico , Aparelhos Ortodônticos , Braquetes Ortodônticos , Fechamento de Espaço Ortodôntico/instrumentação , Fechamento de Espaço Ortodôntico/métodos , Fios Ortodônticos , Planejamento de Assistência ao Paciente , Estresse Mecânico , Coroa do Dente , Torque , Resultado do Tratamento
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