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1.
Am J Orthod Dentofacial Orthop ; 146(1): 108-18, 2014 Jul.
Article in English | MEDLINE | ID: mdl-24975005

ABSTRACT

This case report describes the treatment and long-term follow-up care of a patient diagnosed with cleidocranial dysplasia who had multiple impacted permanent and supernumerary teeth. The aim of the treatment was to provide an adequate esthetic and functional reconstruction of the occlusion with good periodontal care. The patient was treated with a multidisciplinary therapeutic protocol including orthodontic and surgical procedures, and traction of 11 permanent teeth. The proposed objectives of good occlusion, normal function, healthy periodontium, and balanced profile were achieved, and the 3-year follow-up records showed stable results.


Subject(s)
Cleidocranial Dysplasia/complications , Malocclusion, Angle Class III/therapy , Orthodontics, Corrective/methods , Tooth, Impacted/therapy , Tooth, Supernumerary/therapy , Cephalometry/methods , Female , Follow-Up Studies , Humans , Maxilla/abnormalities , Orthodontic Extrusion/methods , Orthodontic Retainers , Orthodontic Space Closure/methods , Patient Care Planning , Tooth, Supernumerary/surgery , Treatment Outcome , Vertical Dimension , Young Adult
2.
Am J Orthod Dentofacial Orthop ; 143(3): 412-20, 2013 Mar.
Article in English | MEDLINE | ID: mdl-23452976

ABSTRACT

The treatment of anterior open bite often requires the use of skeletal anchorage to prevent excessive eruption of the posterior teeth and consequent downward rotation of the mandible. However, this procedure might not always be accomplished. This article reports the successful treatment of an anterior open bite and a posterior crossbite in a young boy, combining traditional techniques and involving high-pull maxillary traction to help growth to correct the skeletal Class II malocclusion without skeletal anchorage. The vertical dentoalveolar contribution of maxillary growth was also favorable to close the bite, whereas cross-elastics corrected the axial inclination of the mandibular posterior teeth, eliminating the inverted posterior crossbite. The open bite was completely closed with edgewise appliances, which also achieved normal overjet, intercuspation, and incisor exposure on smiling. Traditional mechanics for the treatment of open bite and crossbite remain a useful alternative when patients do not accept skeletal anchorage.


Subject(s)
Malocclusion, Angle Class II/therapy , Open Bite/therapy , Orthodontics, Corrective/methods , Cephalometry , Child , Extraoral Traction Appliances , Humans , Male , Malocclusion/complications , Malocclusion/therapy , Malocclusion, Angle Class II/complications , Open Bite/complications , Open Bite/etiology , Orthodontics, Corrective/instrumentation , Tongue Habits/adverse effects , Tongue Habits/therapy
3.
Am J Orthod Dentofacial Orthop ; 143(5): 633-44, 2013 May.
Article in English | MEDLINE | ID: mdl-23631965

ABSTRACT

INTRODUCTION: The purposes of this study were to analyze and compare the immediate effects of rapid and slow maxillary expansion protocols, accomplished by Haas-type palatal expanders activated in different frequencies of activation on the positioning of the maxillary first permanent molars and on the buccal alveolar bones of these teeth with cone-beam computerized tomography. METHODS: The sample consisted of 33 children (18 girls, 15 boys; mean age, 9 years) randomly distributed into 2 groups: rapid maxillary expansion (n = 17) and slow maxillary expansion (n = 16). Patients in the rapid maxillary expansion group received 2 turns of activation (0.4 mm) per day, and those in the slow maxillary expansion group received 2 turns of activation (0.4 mm) per week until 8 mm of expansion was achieved in both groups. Cone-beam computerized tomography images were taken before treatment and after stabilization of the jackscrews. Data were gathered through a standardized analysis of cone-beam computerized tomography images. Intragroup statistical analysis was accomplished with the Wilcoxon matched-pairs test, and intergroup statistical analysis was accomplished with analysis of variance. Linear relationships, among all variables, were determined by Spearman correlation. RESULTS AND CONCLUSIONS: Both protocols caused buccal displacement of the maxillary first permanent molars, which had more bodily displacement in the slow maxillary expansion group, whereas more inclination was observed in the rapid maxillary expansion group. Vertical and horizontal bone losses were found in both groups; however, the slow maxillary expansion group had major bone loss. Periodontal modifications in both groups should be carefully considered because of the reduction of spatial resolution in the cone-beam computerized tomography examinations after stabilization of the jackscrews. Modifications in the frequency of activation of the palatal expander might influence the dental and periodontal effects of palatal expansion.


Subject(s)
Alveolar Bone Loss/etiology , Alveolar Process/pathology , Orthodontics, Corrective/methods , Palatal Expansion Technique/adverse effects , Alveolar Bone Loss/pathology , Alveolar Process/diagnostic imaging , Child , Cone-Beam Computed Tomography , Dental Arch/anatomy & histology , Female , Humans , Imaging, Three-Dimensional , Male , Maxilla , Molar , Orthodontic Appliance Design , Orthodontics, Corrective/instrumentation , Palatal Expansion Technique/instrumentation , Periodontium/pathology , Statistics, Nonparametric , Time Factors
4.
Am J Orthod Dentofacial Orthop ; 141(4 Suppl): S140-8, 2012 Apr.
Article in English | MEDLINE | ID: mdl-22449594

ABSTRACT

A girl with an Angle Class III malocclusion, anterior and posterior crossbites, a concave profile, and cleft lip and palate sought orthodontic treatment. She was treated with a multidisciplinary therapeutic protocol including orthodontic and surgical procedures. The proposed objectives of occlusion, normal function, and balanced profile were achieved, and these results remained stable 4 years after the treatment.


Subject(s)
Alveoloplasty , Cleft Palate/complications , Malocclusion, Angle Class III/therapy , Orthodontics, Corrective/methods , Palatal Expansion Technique , Tooth, Supernumerary/therapy , Bone Transplantation , Cephalometry , Child , Cleft Lip/complications , Dentition, Mixed , Dentition, Permanent , Facial Asymmetry/etiology , Facial Asymmetry/therapy , Female , Humans , Malocclusion, Angle Class III/etiology , Overbite/etiology , Overbite/therapy , Treatment Outcome
5.
Dental Press J Orthod ; 27(4): e2220120, 2022.
Article in English | MEDLINE | ID: mdl-36169495

ABSTRACT

OBJECTIVE: To determine the prevalence of malocclusion and its association with the early loss of deciduous teeth and other factors in children in the mixed dentition phase, aged six to eight years, enrolled in public schools in southern Brazil. METHODS: A cross-sectional study was conducted with a representative sample of 528 children from municipal public schools in 2009. Data collection involved a clinical examination for the determination of early tooth loss, dental caries, tongue pressure and malocclusion (outcome), as well as the administration of a questionnaire. Poisson regression analysis with robust variance was used to model the association between malocclusion and the independent variables. RESULTS: The prevalence of malocclusion and early tooth loss was 69.1% and 21.8%, respectively. In the raw data analysis, malocclusion was associated with age, early tooth loss, dental caries and tongue pressure. After the adjustment, the likelihood of malocclusion was greater among children older than eight years, those who exerted tongue pressure on the teeth and those with early tooth loss. The likelihood of malocclusion was 24% greater among children with early tooth loss, compared to those without tooth loss. CONCLUSION: The early loss of deciduous teeth was associated with the occurrence of malocclusion in the children studied.


Subject(s)
Dental Caries , Malocclusion , Tooth Loss , Child , Cross-Sectional Studies , Dental Caries/epidemiology , Dentition, Mixed , Humans , Malocclusion/epidemiology , Pressure , Prevalence , Students , Tongue , Tooth, Deciduous
6.
Am J Orthod Dentofacial Orthop ; 137(5): 658-64, 2010 May.
Article in English | MEDLINE | ID: mdl-20451785

ABSTRACT

INTRODUCTION: The purpose of this study was to evaluate palatal contours in nonextraction orthodontic treatment and long-term stability in patients with Class II Division 1 malocclusions. METHODS: Data were obtained from maxillary study models before treatment, after treatment, and at least 5 years postretention. Data were collected with a digital pantograph in the canine, second premolar, and first molar regions. Palatal width, base width, palatal height, and alveolar angle were evaluated. RESULTS: During treatment, the canine region was stable; in the premolar and molar regions, there were statistically significant increases in transverse (palatal and base widths) and palatal height measurements, whereas the alveolar angle decreased. In the postretention evaluation, the canine region showed the greatest modifications, except for alveolar angulation, which was stable. The premolar region showed stability, but, in the molar region, palatal width and alveolar angulation decreased. CONCLUSIONS: In analyzing alterations in the geometry of palatal configuration, we concluded that a favorable transverse gain of the palatal base, from growth or orthodontics, was important for stability. The transverse gain of palatal base width during Class II treatment is important to compensate for the expected transverse loss in the cervical region and the decrease of alveolar angle in the long term.


Subject(s)
Malocclusion, Angle Class II/therapy , Palate/pathology , Adolescent , Alveolar Process/pathology , Bicuspid/pathology , Cephalometry , Child , Cuspid/pathology , Dental Arch/pathology , Female , Follow-Up Studies , Humans , Longitudinal Studies , Male , Malocclusion, Angle Class II/pathology , Maxilla/pathology , Models, Dental , Molar/pathology , Palate/growth & development
7.
Dental Press J Orthod ; 22(2): 61-68, 2017.
Article in English | MEDLINE | ID: mdl-28658357

ABSTRACT

OBJECTIVE:: The aim of this randomized clinical trial was to evaluate the dental, dentoalveolar, and skeletal changes occurring right after the rapid maxillary expansion (RME) and slow maxillary expansion (SME) treatment using Haas-type expander. METHODS:: All subjects performed cone-beam computed tomography (CBCT) before installation of expanders (T1) and right after screw stabilization (T2). Patients who did not follow the research parameters were excluded. The final sample resulted in 21 patients in RME group (mean age of 8.43 years) and 16 patients in SME group (mean age of 8.70 years). Based on the skewness and kurtosis statistics, the variables were judged to be normally distributed and paired t-test and student t-test were performed at significance level of 5%. RESULTS:: Intermolar angle changed significantly due to treatment and RME showed greater buccal tipping than SME. RME showed significant changes in other four measurements due to treatment: maxilla moved forward and mandible showed backward rotation and, at transversal level both skeletal and dentoalveolar showed significant changes due to maxillary expansion. SME showed significant dentoalveolar changes due to maxillary expansion. CONCLUSIONS:: Only intermolar angle showed significant difference between the two modalities of maxillary expansion with greater buccal tipping for RME. Also, RME produced skeletal maxillary expansion and SME did not. Both maxillary expansion modalities were efficient to promote transversal gain at dentoalveolar level. Sagittal and vertical measurements did not show differences between groups, but RME promoted a forward movement of the maxilla and backward rotation of the mandible.


Subject(s)
Cone-Beam Computed Tomography/methods , Maxilla/diagnostic imaging , Palatal Expansion Technique/instrumentation , Anatomic Landmarks/anatomy & histology , Anatomic Landmarks/diagnostic imaging , Child , Female , Humans , Imaging, Three-Dimensional/methods , Male , Mandible/anatomy & histology , Mandible/diagnostic imaging , Maxilla/anatomy & histology , Orthodontic Appliance Design , Orthodontic Brackets , Time Factors , Treatment Outcome
8.
Dental press j. orthod. (Impr.) ; 27(4): e2220120, 2022. tab
Article in English | LILACS-Express | LILACS, BBO - dentistry (Brazil) | ID: biblio-1404493

ABSTRACT

ABSTRACT Objective: To determine the prevalence of malocclusion and its association with the early loss of deciduous teeth and other factors in children in the mixed dentition phase, aged six to eight years, enrolled in public schools in southern Brazil. Methods: A cross-sectional study was conducted with a representative sample of 528 children from municipal public schools in 2009. Data collection involved a clinical examination for the determination of early tooth loss, dental caries, tongue pressure and malocclusion (outcome), as well as the administration of a questionnaire. Poisson regression analysis with robust variance was used to model the association between malocclusion and the independent variables. Results: The prevalence of malocclusion and early tooth loss was 69.1% and 21.8%, respectively. In the raw data analysis, malocclusion was associated with age, early tooth loss, dental caries and tongue pressure. After the adjustment, the likelihood of malocclusion was greater among children older than eight years, those who exerted tongue pressure on the teeth and those with early tooth loss. The likelihood of malocclusion was 24% greater among children with early tooth loss, compared to those without tooth loss. Conclusion: The early loss of deciduous teeth was associated with the occurrence of malocclusion in the children studied.


RESUMO Objetivo: Determinar a prevalência de má oclusão em crianças de seis a oito anos de idade no município de Florianópolis (Santa Catarina, Brasil), e a sua associação com a perda precoce de dentes decíduos. Métodos: Esse estudo transversal avaliou uma amostra representativa de 528 crianças de escolas públicas municipais de Florianópolis, no ano de 2009. Os dados foram coletados por meio de exame clínico (perda dentária precoce, cárie dentária, interposição lingual e má oclusão - que foi o desfecho do estudo) e de um questionário. A regressão de Poisson com variância robusta foi utilizada para modelar a associação entre má oclusão e as variáveis independentes. Resultados: A prevalência de má oclusão e de perda dentária precoce foi, respectivamente, de 66,7% e 21,8%. Na análise dos dados brutos, a má oclusão foi associada com a idade, perda dentária precoce e cárie dentária. Após ser feito o ajuste, crianças com mais de 7 anos, com interposição lingual e perda dentária precoce apresentaram maior probabilidade de ter má oclusão. Crianças com perda dentária precoce apresentaram probabilidade 24% maior de ter má oclusão do que aquelas sem perda dentária. Conclusões: A perda precoce de dentes decíduos foi associada à ocorrência de má oclusão nas crianças estudadas.

9.
Am J Dent ; 19(1): 47-50, 2006 Feb.
Article in English | MEDLINE | ID: mdl-16555658

ABSTRACT

PURPOSE: This study evaluated bond strengths of orthodontic brackets to instrumented and uninstrumented enamel using self-etching adhesive systems when compared to a total-etch adhesive system. The adhesive remnant index (ARI) was also determined after debonding. METHODS: 140 bovine incisors were included in acrylic resin, and divided randomly in two groups: instrumented vs. uninstrumented enamel. For the instrumented enamel, specimens had their facial enamel ground flat to 600-grit. In each group, specimens were subdivided into four experimental subgroups according to the adhesive technique used: Transbond Plus, Adper Prompt L-Pop, iBond, and Adper Single Bond, applied following manufacturers' instructions. Orthodontic brackets were bonded to the treated instrumented or uninstrumented enamel with Transbond XT light-cured resin-based composite cement, and the bond strength was tested in shear mode after 7 days. One group where no etch and no adhesive were used served as a control. ARI scores were determined after debonding. RESULTS: There was no statistically significant difference in mean bond strengths between instrumented and uninstrumented enamel for any of the adhesive systems (P > or = 0.05). No significant differences were observed for bond strengths among the adhesives tested (P = 0.308), and all experimental groups resulted in mean bond strengths significantly higher than the controls (P < 0.05). Statistically significant differences were identified when ARI scores were compared, with less adhesive remnants being observed for iBond (uninstrumented enamel) and the control groups (P < 0.05).


Subject(s)
Acid Etching, Dental/methods , Dental Bonding , Dental Cements/chemistry , Dental Enamel/ultrastructure , Orthodontic Brackets , Adhesiveness , Animals , Bisphenol A-Glycidyl Methacrylate/chemistry , Cattle , Dental Prophylaxis , Materials Testing , Random Allocation , Resin Cements/chemistry , Stress, Mechanical , Surface Properties , Time Factors
10.
Angle Orthod ; 76(2): 198-203, 2006 Mar.
Article in English | MEDLINE | ID: mdl-16539542

ABSTRACT

The purpose of this study was to measure and verify the esthetic influence of the bilateral spaces between maxillary teeth and lip corners, called negative space (NS), during smile. The sample was comprised of 60 smile photographs obtained from 60 individuals (30 men and 30 women) aged 18 to 25 years old. Two orthodontists and two lay people evaluated these pictures regarding esthetics by a visual analogue scale. In each picture, the right and left NS were measured in millimeters and in proportion to the smile width (SW). Data were analyzed for statistical significance (P = .05). The mean NS of the sample was 6.68 +/- 1.99 mm, and the NS proportion in relation to the SW was 9.6 +/- 2.56%, for both sides of the arch. No significant asymmetries were observed between the right and left sides. The NS was significantly larger in men than in women when measured in millimeters (P = .028) (7.08 +/- 2.24 mm in men vs 6.28 +/- 1.62 mm in women), but the NS proportion to the SW was similar (9.94 +/- 2.24% in men vs 9.26 +/- 1.61% in women). When the 12 individuals with the smallest NS in proportion to SW were compared with the 12 individuals with the largest NS in proportion to SW, there was no statistical difference regarding the esthetic evaluation (P = .11). It was concluded that the NS did not influence the esthetic evaluation of smile photographs in the sample in this study, for both orthodontists and lay people.


Subject(s)
Cheek/anatomy & histology , Esthetics, Dental , Lip/anatomy & histology , Smiling , Adolescent , Adult , Cephalometry , Female , Humans , Male , Photography, Dental , Sex Factors
11.
World J Orthod ; 7(3): 279-85, 2006.
Article in English | MEDLINE | ID: mdl-17009478

ABSTRACT

Optimal facial esthetics is one of the objectives in orthodontic treatment and an important issue in modern society. In this context, orthodontic treatment permits individuals with dental malpositions to achieve improved dentofacial esthetics. To reach this result, the orthodontist needs to recognize the characteristics considered normal and pleasant in dental arches and smiles. The objective of this article is to review and discuss criterion adopted by dental literature to technically analyze the smile, such as dental midline, smile line, dental exposure, negative space, dental proportion, and symmetry. This article proposes a way to visualize an ideal smile for each patient.


Subject(s)
Esthetics, Dental , Photography, Dental , Smiling , Cephalometry , Dental Occlusion , Humans
12.
Gen Dent ; 51(2): 120-6, 2003.
Article in English | MEDLINE | ID: mdl-15055683

ABSTRACT

This study evaluated the results obtained by two space-regaining devices in children with mixed dentition and premature loss of mandibular deciduous molars. There were no statistical differences between the amount of space regained by each device; however, the distalizing screw regained space at a faster rate.


Subject(s)
Orthodontic Appliance Design , Tooth Movement Techniques/instrumentation , Cephalometry , Child , Dental Arch/pathology , Dentition, Mixed , Female , Humans , Male , Malocclusion/etiology , Malocclusion/therapy , Mandible/pathology , Molar/pathology , Statistics, Nonparametric , Tooth Exfoliation/complications , Tooth, Deciduous/pathology
13.
Dental Press J Orthod ; 18(1): 55-62, 2013.
Article in English | MEDLINE | ID: mdl-23876950

ABSTRACT

OBJECTIVE: To analyze the in vitro force degradation of four different brands of elastomeric chains: American Orthodontics, Morelli, Ormco and TP Orthodontics. METHODS: The sample consisted of 80 gray elastomeric chains that were divided into four groups according to their respective manufacturers. Chain stretching was standardized at 21 mm with initial force release ranging from 300 g to 370 g. The samples were kept in artificial saliva at a constant temperature of 37°C and the degradation force was recorded at the following time intervals: initial, 1, 3, 5, 7 and 9 hours, and 1, 7, 14, 21, 28, and 35 days. RESULTS: There was a statistically significant difference between the groups regarding the force degradation, mainly within the first day, as a force loss of 50-55% was observed during that time in relation to the initial force. The force delivered at 35 days ranged from 122 g to 148 g. CONCLUSIONS: All groups showed force degradation over time, regardless of their trademarks, a force loss of 59-69% was observed in the first hour compared to baseline. However, because the variation in force degradation depends on the trademark, studies such as the present one are important for guiding the clinical use of these materials.


Subject(s)
Elastomers/chemistry , Materials Testing/methods , Orthodontics, Corrective/instrumentation , Polyurethanes/chemistry , Analysis of Variance , Saliva, Artificial , Stress, Mechanical , Tensile Strength
14.
Braz Oral Res ; 27(2): 136-41, 2013.
Article in English | MEDLINE | ID: mdl-23459769

ABSTRACT

The aim of this in vitro study was to compare the flexural, compressive and diametral tensile strengths of five cements used in orthodontics for band cementation. Twelve specimens of each cement were tested: 1 - GC Fuji Ortho Band (FJ), GC America Inc.; 2 - Meron (MR), Voco; 3 - Multi-Cure Glass Ionomer Band Cement (MC), 3M Unitek; 4 - Band-Lok (BL), Reliance Orthodontic Products; and 5 - Ketac Cem (KC), 3M ESPE. The results (mean) for diametral tensile strength were: 10.51 MPa (FJ), 9.60 MPa (MR), 20.04 MPa (MC), 42.80 MPa (BL), and 4.08 MPa (KC). The results for compressive strength were (in the same order): 64.50 MPa, 77.71 MPa, 94.21 MPa, 193.88 MPa, and 81.93 MPa. The results for flexural strength were (in the same order): 20.72 MPa, 25.84 MPa, 53.41 MPa, 137.41 MPa, and 20.50 MPa. The statistical analysis was performed by two-way ANOVA and Tukey tests with p-value £ 0.05. In terms of diametral tensile strength, BL showed the highest strength statistically, and MC, the second highest. In terms of compressive tensile strength, BL showed the highest strength statistically, and FJ did not attain the minimum recommended strength. In terms of flexural tensile strength, BL cement was superior to MC, and MR, FJ and KC were equivalent and inferior to BL and MC.


Subject(s)
Acrylic Resins/chemistry , Aluminum Silicates/chemistry , Cementation/methods , Glass Ionomer Cements/chemistry , Magnesium Oxide/chemistry , Polycarboxylate Cement/chemistry , Zinc Oxide/chemistry , Analysis of Variance , Compressive Strength , Materials Testing , Surface Properties , Tensile Strength
15.
Dental press j. orthod. (Impr.) ; 22(2): 61-68, Mar.-Apr. 2017. tab, graf
Article in English | LILACS | ID: biblio-840221

ABSTRACT

ABSTRACT OBJECTIVE: The aim of this randomized clinical trial was to evaluate the dental, dentoalveolar, and skeletal changes occurring right after the rapid maxillary expansion (RME) and slow maxillary expansion (SME) treatment using Haas-type expander. METHODS: All subjects performed cone-beam computed tomography (CBCT) before installation of expanders (T1) and right after screw stabilization (T2). Patients who did not follow the research parameters were excluded. The final sample resulted in 21 patients in RME group (mean age of 8.43 years) and 16 patients in SME group (mean age of 8.70 years). Based on the skewness and kurtosis statistics, the variables were judged to be normally distributed and paired t-test and student t-test were performed at significance level of 5%. RESULTS: Intermolar angle changed significantly due to treatment and RME showed greater buccal tipping than SME. RME showed significant changes in other four measurements due to treatment: maxilla moved forward and mandible showed backward rotation and, at transversal level both skeletal and dentoalveolar showed significant changes due to maxillary expansion. SME showed significant dentoalveolar changes due to maxillary expansion. CONCLUSIONS: Only intermolar angle showed significant difference between the two modalities of maxillary expansion with greater buccal tipping for RME. Also, RME produced skeletal maxillary expansion and SME did not. Both maxillary expansion modalities were efficient to promote transversal gain at dentoalveolar level. Sagittal and vertical measurements did not show differences between groups, but RME promoted a forward movement of the maxilla and backward rotation of the mandible.


RESUMO OBJETIVO: o objetivo do presente ensaio clínico randomizado foi avaliar as transformações dentárias, dentoalveolares e ósseas que ocorrem imediatamente após o tratamento com expansão rápida da maxila (ERM) e lenta (ELM) usando expansores do tipo Haas. MÉTODOS: todos os indivíduos foram submetidos a tomografias computadorizadas de feixe cônico (TCFC) antes da colocação dos expansores (T1) e imediatamente após a estabilização do parafuso (T2). Os pacientes que não seguiram os parâmetros da pesquisa foram excluídos. A amostra final constou de 21 pacientes no grupo ERM (idade média de 8,43 anos) e 16 no grupo ELM (idade média de 8,7 anos). Com base em estatística de assimetria e curtose, as variáveis foram consideradas de distribuição normal, e os testes t pareado e t de Student foram realizados, com nível de significância de 5%. RESULTADOS: o ângulo intermolares mudou significativamente devido ao tratamento, e o grupo ERM apresentou maior inclinação vestibular do que o grupo ELM. O grupo ERM mostrou alterações significativas em outras quatro medidas devido ao tratamento: a maxila apresentou deslocamento anterior e a mandíbula, rotação posterior; no nível transversal, houve tanto alterações ósseas quanto dentoalveolares significativas, devido à expansão maxilar. O grupo ELM apresentou alterações significativas devido à expansão maxilar. CONCLUSÕES: apenas o ângulo intermolares apresentou diferença significativa entre as duas modalidades de expansão maxilar, com maior inclinação vestibular no grupo ERM. A ERM resultou, também, em expansão maxilar óssea, ao contrário da ELM. As duas modalidades de expansão maxilar promoveram, de forma eficiente, um ganho transversal em nível dentoalveolar. As medidas sagitais e verticais não apresentaram diferenças entre os grupos, mas a ERM promoveu o deslocamento anterior da maxila e a rotação posterior da mandíbula.


Subject(s)
Humans , Male , Female , Child , Palatal Expansion Technique/instrumentation , Cone-Beam Computed Tomography/methods , Maxilla/diagnostic imaging , Time Factors , Treatment Outcome , Orthodontic Brackets , Orthodontic Appliance Design , Imaging, Three-Dimensional/methods , Anatomic Landmarks/anatomy & histology , Anatomic Landmarks/diagnostic imaging , Mandible/anatomy & histology , Mandible/diagnostic imaging , Maxilla/anatomy & histology
16.
World J Orthod ; 11(1): 49-54, 2010.
Article in English | MEDLINE | ID: mdl-20209177

ABSTRACT

AIM: To assess the relationship between palatal height and width on plaster casts from 33 growing individuals with Class II Division 1 relationships who received orthodontic treatment without extraction. METHODS: The palatal contours in the permanent canine and first molar regions were registered with a digital pantograph before treatment (T1), at the end of treatment (T2), and at least 5 years posttreatment (T3). RESULTS: The anterior palatal height did not change between T1 and T2, but a significant reduction was observed between T2 and T3. In the posterior palatal region, the height increased between T1 and T2 but not thereafter. No significant transverse changes were found in the canine region between T1 and T2. In the posterior region, however, the width increased significantly between T1 and T2. CONCLUSION: Palatal morphology in orthodontically treated Class II patients changed from an initially more triangular into a more square shape due to an increase in height and basal width, as well as a decrease in cervical width.


Subject(s)
Cephalometry/methods , Malocclusion, Angle Class II/therapy , Palate/pathology , Adolescent , Adult , Cephalometry/instrumentation , Child , Cuspid/pathology , Extraoral Traction Appliances , Female , Follow-Up Studies , Humans , Longitudinal Studies , Male , Malocclusion, Angle Class II/pathology , Models, Dental , Molar/pathology , Orthodontics, Corrective/instrumentation , Young Adult
18.
Dental press j. orthod. (Impr.) ; 18(1): 55-62, Jan.-Feb. 2013. ilus, graf, tab
Article in English | LILACS | ID: lil-674264

ABSTRACT

OBJECTIVE: To analyze the in vitro force degradation of four different brands of elastomeric chains: American Orthodontics, Morelli, Ormco and TP Orthodontics. METHODS: The sample consisted of 80 gray elastomeric chains that were divided into four groups according to their respective manufacturers. Chain stretching was standardized at 21 mm with initial force release ranging from 300 g to 370 g. The samples were kept in artificial saliva at a constant temperature of 37°C and the degradation force was recorded at the following time intervals: initial, 1, 3, 5, 7 and 9 hours, and 1, 7, 14, 21, 28, and 35 days. RESULTS: There was a statistically significant difference between the groups regarding the force degradation, mainly within the first day, as a force loss of 50-55% was observed during that time in relation to the initial force. The force delivered at 35 days ranged from 122 g to 148 g. CONCLUSION: All groups showed force degradation over time, regardless of their trademarks, a force loss of 59-69% was observed in the first hour compared to baseline. However, because the variation in force degradation depends on the trademark, studies such as the present one are important for guiding the clinical use of these materials.


OBJETIVO: analisar, in vitro, a degradação de força, ao longo do tempo, de elastômeros das marcas comerciais American Orthodontics, Morelli, Ormco e TP Orthodontics. MÉTODOS: a amostra constituiu-se de 80 segmentos de elastômeros em cadeia fechada na cor cinza, divididos em quatro grupos, conforme o fabricante. A distensão foi padronizada em 21mm, com liberação de força inicial variando de 300 a 370g de força. As amostras foram mantidas em saliva artificial em temperatura constante de 37ºC, e a força avaliada nos seguintes intervalos: inicial, 1h, 3h, 5h, 7h, 9h, 1 dia, 7 dias, 14 dias, 21 dias, 28 dias e 35 dias. RESULTADOS: houve diferença estatisticamente significativa na degradação de força entre os grupos avaliados, sendo que no primeiro dia houve perda de 50 a 55% em relação à força inicial. Os valores médios de força em 35 dias variaram de 122 a 148g. CONCLUSÃO: todas as marcas comerciais apresentaram degradação de força ao longo do tempo, sendo que na primeira hora a perda de força esteve entre 59 e 69% da força inicial. Porém, como existe variação dessa degradação dependendo da marca comercial, estudos como esses são importantes para orientação do uso desses elastômeros.


Subject(s)
Elastomers/chemistry , Materials Testing/methods , Orthodontics, Corrective/instrumentation , Polyurethanes/chemistry , Analysis of Variance , Saliva, Artificial , Stress, Mechanical , Tensile Strength
19.
Braz. oral res ; 27(2): 136-141, Mar-Apr/2013. tab
Article in English | LILACS | ID: lil-667996

ABSTRACT

The aim of this in vitro study was to compare the flexural, compressive and diametral tensile strengths of five cements used in orthodontics for band cementation. Twelve specimens of each cement were tested: 1 - GC Fuji Ortho Band (FJ), GC America Inc.; 2 - Meron (MR), Voco; 3 - Multi-Cure Glass Ionomer Band Cement (MC), 3M Unitek; 4 - Band-Lok (BL), Reliance Orthodontic Products; and 5 - Ketac Cem (KC), 3M ESPE. The results (mean) for diametral tensile strength were: 10.51 MPa (FJ), 9.60 MPa (MR), 20.04 MPa (MC), 42.80 MPa (BL), and 4.08 MPa (KC). The results for compressive strength were (in the same order): 64.50 MPa, 77.71 MPa, 94.21 MPa, 193.88 MPa, and 81.93 MPa. The results for flexural strength were (in the same order): 20.72 MPa, 25.84 MPa, 53.41 MPa, 137.41 MPa, and 20.50 MPa. The statistical analysis was performed by two-way ANOVA and Tukey tests with p-value £ 0.05. In terms of diametral tensile strength, BL showed the highest strength statistically, and MC, the second highest. In terms of compressive tensile strength, BL showed the highest strength statistically, and FJ did not attain the minimum recommended strength. In terms of flexural tensile strength, BL cement was superior to MC, and MR, FJ and KC were equivalent and inferior to BL and MC.


Subject(s)
Acrylic Resins/chemistry , Aluminum Silicates/chemistry , Cementation/methods , Glass Ionomer Cements/chemistry , Magnesium Oxide/chemistry , Polycarboxylate Cement/chemistry , Zinc Oxide/chemistry , Analysis of Variance , Compressive Strength , Materials Testing , Surface Properties , Tensile Strength
20.
Texto & contexto enferm ; 22(4): 1041-1048, out.-dez. 2013.
Article in Portuguese | BDENF - nursing (Brazil), LILACS | ID: lil-701537

ABSTRACT

O objetivo foi conhecer a influência da escola na vida e nos cuidados com a saúde de crianças e adolescentes com fissura labiopalatal atendidas em um centro de referência do Sul do Brasil. A pesquisa foi do tipo exploratório-descritiva, com abordagem qualitativa. Foram realizadas entrevistas semiestruturadas com 15 mães de crianças e adolescentes com fissura labiopalatal participantes de um programa de acompanhamento da saúde bucal. A análise dos dados foi fundamentada na técnica de análise temática, pertencente à análise de conteúdo, originando duas categorias temáticas centrais: enfrentando e superando o preconceito relacionado à má formação; e a escola influenciando a saúde bucal da criança e adolescente e o seu desenvolvimento. A escola traz à criança e adolescente com fissura labiopalatal possibilidades de cuidados e inclusão social, mas também pode trazer conflitos pelo preconceito gerado pela sua aparência física. O apoio da comunidade escolar é essencial para que possam ter um desenvolvimento adequado com qualidade de vida.


The aim of this study was to understand the influence of school in the life and care of the health of children with cleft lips and palates, treated at a reference center in southern Brazil. This qualitative descriptive-exploratory study was performed using semi-structured interviews, conducted with 15 mothers of children and teenagers with cleft lips and palates of an oral health surveillance program. The data analysis was based on the thematic analysis, which highlights two central themes: facing and overcoming the stigma associated with the physical appearance, and the school as an influence on the oral health of children and teenagers and their development. The school provides children and teenagers with cleft lips and palates with opportunities of social integration, but it also contributes to conflicts generated by the prejudice against their physical appearance. The support of the school community is essential for proper development of quality of life.


El objetivo fue estudiar la influencia de la escuela en la vida e en el cuidado de de niños y adolescentes con fisura labiopalatina atendidos en un centro de referencia en el sur de Brasil. Investigación cualitativa de tipo descriptivo-exploratorio que realizó entrevistas semiestructuradas con 15 madres de niños y adolescentes con fisura labiopalatina de un programa de vigilancia de la salud bucal. El análisis de los datos se fundamentó en el análisis temático, destacando dos temas centrales: Enfrentando y superando los prejuicios relacionados con la malformación, y La escuela como influencia en la salud bucal de los niños y su desarrollo. La escuela trae a los niños y adolescentes con fisura labiopalatina posibilidades de cuidados e inserción social, pero también trae conflictos generados por los prejuicios de su apariencia física. El apoyo de la comunidad escolar es esencial para el desarrollo adecuado con calidad de vida.


Subject(s)
Humans , Child , School Health Services , Oral Health , Cleft Lip , Cleft Palate
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