Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 3.291
Filtrar
1.
Medicine (Baltimore) ; 100(8): e24869, 2021 Feb 26.
Artículo en Inglés | MEDLINE | ID: mdl-33663114

RESUMEN

ABSTRACT: Techniques for enhancing the effective space of the mandibular arch are urgently needed. Therefore, this study aimed to perform mandibular expansion in combination with a fixed-appliance technique, with preliminary monitoring by finite element analysis and 3-dimensional cone-beam computed tomography (CBCT).Finite element models were structured according to CBCT images of a 14-year-old girl. The von Mises stress of the alveolar bone and tooth displacement were assessed in different models. The technique was also applied in an 11-year-old boy. CBCT was performed at post-expansion, post-retention, post-treatment and 2 years after treatment. Tooth movement and alveolar bone stress were assessed by the CAD software.Finite element analysis suggested that the teeth tended to stand upright in the buccal side in the expander model compared with the expander-remove model. However, minimum tooth change was observed in the normal model, indicating highest stability. The von Mises stress of the alveolar bone was decreased in the normal model compared with the expander model, suggesting that buccal-inclined teeth could more easily lead to alveolar bone stress than normal ones. Based on CBCT data and the 3D mandibular dentition model fitting, mandibular teeth tended to be upright in the buccal side after retention compared with the post-expansion condition, which somewhat differed from finite element analysis results. Furthermore, dehiscence and fenestration were not observed.This expansion technique is expected to increase the effective space after mandibular expansion and reduce buccal alveolar bone stress.


Asunto(s)
Mandíbula/diagnóstico por imagen , Aparatos Ortodóncicos Fijos , Técnica de Expansión Palatina/instrumentación , Técnicas de Movimiento Dental/métodos , Adolescente , Niño , Tomografía Computarizada de Haz Cónico , Femenino , Humanos , Imagenología Tridimensional , Masculino , Proyectos Piloto
2.
Rev. Ateneo Argent. Odontol ; 63(2): 39-54, nov. 2020. ilus
Artículo en Español | LILACS | ID: biblio-1150748

RESUMEN

La búsqueda por encontrar métodos para acortar la duración de los tratamientos de ortodoncia tiene un pasado reciente, un presente y un futuro. Las fuerzas ortodóncicas que se ejercen sobre la membrana periodontal producen movimientos dentarios por modificaciones histológicas y biomoleculares. El conocimiento de los procesos biológicos da lugar a implementar cambios para favorecer la aceleración de los procesos resortivos y neoformativos. El objetivo de esta publicación es hacer una breve síntesis de lo acontecido con este tema y exponer el procedimiento de las micro-osteoperforaciones (MOPs) como una opción complementaria al tratamiento de ortodoncia convencional. Aún no existe suficiente apoyo de ensayos clínicos en humanos para aseverar su éxito. Más aún, distintos autores publican conclusiones contradictorias. Es de esperar que, en breve, nuevas investigaciones contribuyan a respaldarlo o desestimarlo (AU)


The quest to find methods to shorten the duration of orthodontic treatments has a recent past, a present, and a future. Orthodontic forces exerted on the periodontal membrane produce tooth movements by histological and biomolecular modifications. Knowledge of biological processes results in changes to promote the acceleration of spring and neoformative processes. The objective of this publication is to make a brief synthesis of what happened with this topic and expose the micro-osteoperforations (MOPs) procedure as a complementary option to conventional orthodontic treatment. There is not yet enough support from human clinical trials to assert its success. Moreover, different authors publish conflicting conclusions. It is to be expected that, shortly, further investigations will help to support or dismiss it (AU)


Asunto(s)
Humanos , Técnicas de Movimiento Dental/métodos , Fenómenos Biológicos , Procedimientos Quirúrgicos Orales , Microcirugia , Osteotomía/métodos , Resorción Ósea/fisiopatología , Terapia por Luz de Baja Intensidad , Ligando RANK , Duración de la Terapia
3.
PLoS One ; 15(9): e0239759, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32970759

RESUMEN

OBJECTIVE: The purpose of this study was to evaluate the effects of miniscrew insertion angle and vertical facial type on the interradicular miniscrew-root distance available for molar distalization. MATERIALS AND METHODS: Cone-beam computed tomography images of 60 adults with skeletal Class I occlusion exhibiting hyperdivergent (n = 20), normodivergent (n = 20), and hypodivergent (n = 20) facial types were used. Placement of a 6-mm long, 1.5-mm diameter, tapered miniscrew was simulated at a site 4 mm apical to the cementoenamel junction, with insertion angles of 0°, 30°, 45°, and 60° relative to the transverse occlusal plane. The shortest linear distance between the miniscrew and anterior root at four interradicular sites was measured: maxillary second premolar and first molar (Mx 5-6), maxillary first and second molars (Mx 6-7), mandibular second premolar and first molar (Mn 5-6), and mandibular first and second molars (Mn 6-7). RESULTS: Miniscrew-root distance significantly increased as the insertion angle increased from 0° to 60°. In the mandible, the distances significantly differed among vertical facial types, increasing in the following order: hyperdivergent, normodivergent, and hypodivergent. The minimum mean distance was found in the Mx 6-7 (30°; 0.86±0.35 mm), and the maximum mean distance was found in the Mn 5-6 (60°; 2.64±0.56 mm). The rates of miniscrews located buccally outside the root distalization path were up to 70% and 55% when the miniscrews were placed at 60° insertion angles in the Mx 5-6 and Mn 5-6 regions, respectively. CONCLUSIONS: Miniscrew-root distance increased significantly with the increased insertion angle, and the amount of increase was affected by the miniscrew placement site and vertical facial type. To ensure adequate distalization of the posterior segment, the miniscrew should be inserted at an angle in the interradicular area between the second premolar and first molar.


Asunto(s)
Tornillos Óseos , Simulación por Computador , Tomografía Computarizada de Haz Cónico/métodos , Diente Molar/diagnóstico por imagen , Métodos de Anclaje en Ortodoncia/métodos , Técnicas de Movimiento Dental/métodos , Raíz del Diente/diagnóstico por imagen , Adulto , Femenino , Humanos , Masculino , Métodos de Anclaje en Ortodoncia/instrumentación , Técnicas de Movimiento Dental/instrumentación
4.
Cell Prolif ; 53(5): e12810, 2020 May.
Artículo en Inglés | MEDLINE | ID: mdl-32472648

RESUMEN

OBJECTIVES: Gli1+ cells have received extensive attention in tissue homeostasis and injury mobilization. The aim of this study was to investigate whether Gli1+ cells respond to force and contribute to bone remodelling. MATERIALS AND METHODS: We established orthodontic tooth movement (OTM) model to assess the bone response for mechanical force. The transgenic mice were utilized to label and inhibit Gli1+ cells, respectively. Additionally, mice that conditional ablate Yes-associated protein (Yap) in Gli1+ cells were applied in the present study. The tooth movement and bone remodelling were analysed. RESULTS: We first found Gli1+ cells expressed in periodontal ligament (PDL). They were proliferated and differentiated into osteoblastic cells under tensile force. Next, both pharmacological and genetic Gli1 inhibition models were utilized to confirm that inhibition of Gli1+ cells led to arrest of bone remodelling. Furthermore, immunofluorescence staining identified classical mechanotransduction factor Yap expressed in Gli1+ cells and decreased after suppression of Gli1+ cells. Additionally, conditional ablation of Yap gene in Gli1+ cells inhibited the bone remodelling as well, suggesting Gli1+ cells are force-responsive cells. CONCLUSIONS: Our findings highlighted that Gli1+ cells in PDL directly respond to orthodontic force and further mediate bone remodelling, thus providing novel functional evidence in the mechanism of bone remodelling and first uncovering the mechanical responsive property of Gli1+ cells.


Asunto(s)
Remodelación Ósea/fisiología , Huesos/metabolismo , Huesos/fisiología , Proteína con Dedos de Zinc GLI1/metabolismo , Animales , Diferenciación Celular/fisiología , Mecanotransducción Celular/fisiología , Ratones , Ratones Transgénicos , Osteoclastos/metabolismo , Osteoclastos/fisiología , Ligamento Periodontal/metabolismo , Ligamento Periodontal/fisiología , Estrés Mecánico , Técnicas de Movimiento Dental/métodos
5.
PLoS One ; 15(4): e0231492, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32320408

RESUMEN

OBJECTIVE: This meta-analysis aimed at critically assessing currently available evidence regarding the overall effectiveness of Piezocision in accelerating orthodontic tooth movement, as well as the adverse effects of this intervention in orthodontic patients. SEARCH METHODS: Electronic search of 6 databases and additional manual searches up to April 2019 without restrictions, also update the search was done by 20th November. SELECTION CRITERIA: Randomized controlled trials (RCT) and controlled clinical trials (CCT) reporting piezocision-assisted orthodontics versus conventional orthodontics were included in the review. DATA COLLECTION AND ANALYSIS: The data are expressed by mean differences (MD), 95% confidence intervals, fixed-effect model or random-effect model in the meta-analysis in regard to statistical heterogeneity analyses (tau2, and I2). Included randomized studies were assessed for risk of bias using the new Cochrane Risk of Bias tool (ROB.2) and the non-randomized studies were assessed using (ROBINS I) tool. The studies were graded according to the GRADE approach. RESULTS: Fourteen papers for 13 unique trials were included in this systematic review and eight studies were included in the meta-analysis. The meta-analysis showed that the mean difference of the canine retraction rate in the first and second month after piezocision was 0.66 mm/month and 0.48mm/month, respectively. A total canine retraction rate in the first two months after piezocision was statistically significant (0.57 mm/month, p<0.00001), favoring the piezocision group with a high heterogeneity between studies I2 = 69%. For the total treatment time outcome measure, there was a statistically significant difference in the overall treatment time (MD 101.64 Days, 95% CI, 59.24-144.06) favoring the piezocision group. CONCLUSIONS: Low quality evidence suggests that piezocision is an effective surgical procedure in accelerating the rate of canine retraction in the first two months and reducing the treatment duration. However, this effect appears to be clinically insignificant. SYSTEMATIC REVIEW REGISTRATION: CRD42019136303.


Asunto(s)
Técnicas de Movimiento Dental/métodos , Ensayos Clínicos como Asunto , Humanos , Ortodoncia/métodos , Ensayos Clínicos Controlados Aleatorios como Asunto
6.
Medicine (Baltimore) ; 99(13): e19430, 2020 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-32221067

RESUMEN

INTRODUCTION: Loss of a dental element can generate several repercussions in the stomatognathic system. According to the latest survey by the Ministry of Health, in 2010, Brazilian adults had, on average, 7 missing teeth. This loss may lead to movement of the adjacent teeth and the antagonist, which would make prosthetic rehabilitation harder to do. Anchoring systems, such as mini-implants, have been increasingly used as a treatment option because they act with heavy but controlled forces and without side effects. Recent studies have shown that photobiomodulation (PBM) can accelerate orthodontic movement in molar intrusion. The objective of this study will be to evaluate the effect of PBM on the acceleration of the orthodontic movement of molar verticalization and its effect on pain and inflammation of the periodontal tissues. PATIENT CONCERNS:: the concerns assessments will be done over the study using anamnesis interviews and specific questionnaire. DIAGNOSIS: verticalization will be evaluated by clinical and radiographic analysis. INTERVENTIONS: Thirty four healthy patients aged 30 to 60 years, who need to recover the prosthetic space for oral rehabilitation after loss of the posterior inferior dental elements and inclination of the adjacent element, will be randomly divided into 2 groups: G1 (control group) - verticalization by mini-implant + PBM simulation (placebo); G2 (experimental group) - verticalization by mini-implant + PBM. The movements will occur with the aid of mini-implants and elastomeric chains ligatures. The PBM will occur with diode laser application, 808 nm, 100 mW, receiving 1J per point, 10 seconds, 10 points (5 per buccal and 5 per lingual) and radiant exposure of 25 J/cm. The orthodontic forces of verticalization (corresponding to any exchange of elastomeric ligation) will be applied every 30 days and the PBM will be applied immediately, 3 and 7 days of each month, for a period of 3 months. The crevicular gingival fluid (CGF) will be collected on the 1st, 3rd, and 7th days after the first activation, and then on the 3rd day of the following 2 months. OUTCOMES: Interleukins IL1ß, IL-6, IL-8, IL-10, and TNF-α will be analyzed by ELISA. Panoramic radiography will be performed at baseline and 90 afterwards to ascertain the amount (in degrees) of verticalization. To evaluate the pain, the Visual Analog Scale (VAS) will be used in all the consultations, and to evaluate the quality of life, the Oral Health Impact Profile (OHIP-14) questionnaire will be applied. Analgesics will be given and the quantity of drugs will be counted. If the data are normal, they will be submitted to Student t test. The data will be presented as means ± SD and the value of p will be defined as <0.05. DISCUSSION: This protocol will determine the effectiveness of photobiomoduation regarding the orthodontic movement of molar verticalization. ETHICS AND DISSEMINATION: This protocol received approval from the Human Research Ethics Committee of Universidade Nove de Julho (certificate number: 3 533 219). The data will be published in a peer-reviewed periodical.


Asunto(s)
Interleucinas/biosíntesis , Terapia por Luz de Baja Intensidad/métodos , Diente Molar/efectos de la radiación , Técnicas de Movimiento Dental/métodos , Adulto , Brasil , Método Doble Ciego , Femenino , Líquido del Surco Gingival , Humanos , Láseres de Semiconductores , Masculino , Persona de Mediana Edad , Dolor/etiología , Dimensión del Dolor , Calidad de Vida , Técnicas de Movimiento Dental/efectos adversos , Factor de Necrosis Tumoral alfa/biosíntesis
7.
Int J Mol Sci ; 21(4)2020 Feb 24.
Artículo en Inglés | MEDLINE | ID: mdl-32102282

RESUMEN

Surgical methods for accelerating orthodontic tooth movement are limited by possible damage to the tooth root and patient discomfort. 4-Hexylresorcinol (4HR) has been shown to increase bone remodeling and may potentially facilitate tooth movement. This study investigated the (1) effect of 4HR administration on osteoblast-like cells and (2) effect of 4HR administration on tooth movement in ovariectomized rats. Saos-2 cells were treated with either 4HR or solvent (control). Protein expression levels were investigated 2, 8, and 24 h after treatment. Thirty ovariectomized Sprague-Dawley rats were divided into two experimental groups (A and B) and one control group. After installation of an orthodontic tooth movement device, groups A and B received subcutaneous weekly injections of 4HR (1.28 and 128 mg/kg). Micro-computerized tomography and histological analyses were performed after 2 weeks of tooth movement. The application of 4HR elevated expression of osteogenic markers in Saos-2 cells. Movement of the first molars was significantly greater in rats administered 4HR. Furthermore, the expression of bone morphogenic protein-2, receptor activator of nuclear factor kappa-B ligand, osteocalcin, and tartrate-resistant acid phosphatase were increased after 4HR administration. 4HR application demonstrated increased expression of osteogenic markers in Saos-2 cells and accelerated orthodontic tooth movement in rats.


Asunto(s)
Hexilresorcinol/farmacología , Osteogénesis/efectos de los fármacos , Ovariectomía , Técnicas de Movimiento Dental/métodos , Animales , Biomarcadores/sangre , Línea Celular Tumoral , Ensayo de Inmunoadsorción Enzimática , Hexilresorcinol/administración & dosificación , Humanos , Masculino , Persona de Mediana Edad , Osteocalcina/sangre , Osteocalcina/metabolismo , Osteopontina/sangre , Osteopontina/metabolismo , Ratas Sprague-Dawley , Factor de Crecimiento Transformador beta1/sangre , Factor de Crecimiento Transformador beta1/metabolismo
8.
Comput Methods Biomech Biomed Engin ; 23(7): 295-302, 2020 May.
Artículo en Inglés | MEDLINE | ID: mdl-31985276

RESUMEN

The objective of this study was to assess the biomechanical effects of different corticotomy designs used for orthodontic anterior retraction through finite element analysis. MATERIALS AND METHODS: A basic finite element model simulating retraction of anterior teeth was built reversely from CBCT films of an adult patient with protruded maxillary anterior teeth. Another thirteen FE models were created according to different corticotomy designs varied with site width and the extent of incision. The initial displacement, Von Mises stress and pressure stress of dento-alveolar structures was computerized and analyzed. RESULTS: Corticotomy can increase the initial displacement of anterior segment including teeth and surrounding alveolar bone, change the distribution of Von Mises stress in cancellous bone and the pressure stress in periodontal ligament of anterior teeth. When the incision was near the periphery of apical, the anterior segment showed the greatest displacement, the cancellous bone at either sockets or incision region showed the maximum stress. Bilateral incision combined with palatal incision showed approximate initial displacement and stress distribution with circumscribing incision. While the incision width increased, the biomechanical effects of corticotomy amplified. CONCLUSIONS: Varied corticotomy designs can change the biomechanical effects on dento-alveolar structures. The incision near the periphery of apical and bilateral incision combined with palatal incision may be the optimized design used for retraction of anterior teeth.


Asunto(s)
Análisis de Elementos Finitos , Técnicas de Movimiento Dental/métodos , Adulto , Fenómenos Biomecánicos , Humanos , Maxilar/cirugía , Ligamento Periodontal/cirugía , Estrés Mecánico , Diente/cirugía
9.
BMC Oral Health ; 20(1): 22, 2020 01 28.
Artículo en Inglés | MEDLINE | ID: mdl-31992277

RESUMEN

BACKGROUND: Periodontally accelerated osteogenic orthodontics (PAOO) is a treatment for bone defects associated with a lack of bone graft stability, especially in coronal locations. This study aimed to compare a modified technique of membrane fixation that utilizes periosteal sutures (using a pouch design) with the traditional approach, which does not use membrane fixation. METHODS: Twenty-eight patients with a total of 168 teeth treated were divided into two groups: 1-A, in which patients were treated using the modified technique (with membrane fixation), and group 2-B, in which patients were treated using the traditional technique (without membrane fixation). The postoperative bone thickness was evaluated via radiographic examination. RESULTS: Postoperative improvements in bone augmentation were detected in both groups. At 12 months, the values of the CHBT (measured from the midpoint of the coronal third to the labial cortical surface, 0.84 ± 0.33 mm) and the values of VBL (measured from the alveolar crest to the cemento-enamel junction, - 2.35 ± 0.80 mm)were significantly greater in the modified technique group than those in the traditional technique group (CHBT:0.12 ± 0.21 mm and VBL:-1.39 ± 0.99 mm; P = 0.00 and P = 0.01). CONCLUSIONS: This study shows that compared to the traditional technique, the modified PAOO technique with membrane fixation using periosteal sutures provides improved graft stabilization, superior coronal augmentation and satisfactory vertical volume.


Asunto(s)
Proceso Alveolar/cirugía , Trasplante Óseo/métodos , Ortodoncia Correctiva/métodos , Procedimientos Quirúrgicos Ortognáticos/métodos , Osteogénesis/fisiología , Osteotomía/métodos , Aumento de la Cresta Alveolar/métodos , Humanos , Ortodoncia Correctiva/instrumentación , Técnicas de Movimiento Dental/métodos , Resultado del Tratamiento
10.
J Craniofac Surg ; 31(1): 172-177, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-31842074

RESUMEN

This retrospective research aimed to highlight the changes of occlusal plane in Class II hyperdivergent subjects that received cervical headgear treatment and compared them to untreated controls in order to evaluate the occlusal changes that might be connected to a potential mandibular rotation.The sample of this investigation was represented by 20 hyperdivergent Class II subjects (10 males, 10 females; mean age 8.54) corrected by using cervical headgear (treated group) and 21 Class II patients (11 males, 10 females; mean age 8.41) hyperdivergent who had no therapy (control group). Lateral head films were studied for all the patients before treatment (T1) and after therapy (T2) for both groups; cephalometric analysis was used in order to seek the modifications between time points and between groups.Means and standard deviation have been computed for both groups. In order to confront the modification between the time points within the same group the Wilcoxon test was applied. The Mann-Whitney U test was applied to confront the dissimilarities between groups at T2.As a result of the Class II correction by using the cervical headgear treatment the occlusal plane was lowered and flattened compared to T1 and to the control group; the upper molars showed extrusion to the palatal plane, there was a significant forward rotation of mandible and the vertical dimension was not significantly modified. Downward and backward displacement of the upper jaw occurred.


Asunto(s)
Dimensión Vertical , Cefalometría , Niño , Femenino , Cabeza , Humanos , Masculino , Maloclusión Clase II de Angle/terapia , Cuello , Estudios Retrospectivos , Rotación , Estadísticas no Paramétricas , Técnicas de Movimiento Dental/métodos
11.
Oral Maxillofac Surg Clin North Am ; 32(1): 15-26, 2020 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-31685344

RESUMEN

Impacted teeth occur in a significant number of patients. Their management requires coordinated efforts of orthodontists and oral and maxillofacial surgeons. Specifically, optimal results require a prompt orthodontic diagnosis and treatment plan with execution of either closed or open exposure of impacted teeth by the oral and maxillofacial surgeon. Failure to consider orthodontic mechanics and proper surgical technique can lead to suboptimal results. Thus, orthodontist/oral and maxillofacial surgeon communication is essential for success and patient education and shared decision-making is mandatory before initiating treatment.


Asunto(s)
Métodos de Anclaje en Ortodoncia , Planificación de Atención al Paciente , Técnicas de Movimiento Dental/métodos , Diente Impactado/cirugía , Humanos , Cirujanos Oromaxilofaciales
12.
Oral Maxillofac Surg Clin North Am ; 32(1): 27-37, 2020 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-31685345

RESUMEN

As orthodontic treatment has advanced in complexity and in frequency, more recent techniques, using temporary skeletal anchorage, were developed to help correct more severe occlusal and dentofacial discrepancies that were treated with orthognathic surgery alone previously. These techniques have allowed the orthodontist to move teeth against a rigid fixation, allowing for more focused movements of teeth and for orthopedic growth modification. These types of treatments using rigid fixation have allowed for greater interaction between the orthodontist and the oral and maxillofacial surgeon, and have vastly enhanced the treatment planning for the orthodontist in today's society.


Asunto(s)
Métodos de Anclaje en Ortodoncia , Procedimientos Quirúrgicos Ortognáticos/métodos , Planificación de Atención al Paciente , Técnicas de Movimiento Dental/métodos , Humanos , Diseño de Aparato Ortodóncico
13.
Oral Maxillofac Surg Clin North Am ; 32(1): 83-88, 2020 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-31685346

RESUMEN

Patients and orthodontists seek to reduce treatment time in braces. Rapid canine retraction through dentoalveolar distraction osteogenesis is one of several treatment approaches to reduce treatment in braces. This article provides an overview of technique of dentoalveolar distraction osteogenesis to accomplish rapid canine retraction and associated outcomes. When this treatment protocol is implemented well, rapid canine retraction is achieved predictably with minimal side effects. Although current evidence suggests that adverse sequelae, such as root resorptions and pulp devitalization, are rare, prospective clinical studies that are adequately powered and documenting long-term follow-up of these outcomes are lacking.


Asunto(s)
Procedimientos Quirúrgicos Orales/métodos , Métodos de Anclaje en Ortodoncia , Diseño de Aparato Ortodóncico , Osteogénesis por Distracción/métodos , Osteotomía/métodos , Técnicas de Movimiento Dental/métodos , Humanos , Maxilar , Métodos de Anclaje en Ortodoncia/efectos adversos , Métodos de Anclaje en Ortodoncia/instrumentación , Aparatos Ortodóncicos , Procedimientos Quirúrgicos Ortognáticos , Estudios Prospectivos , Resultado del Tratamiento
14.
J Biol Regul Homeost Agents ; 34(6 Suppl. 2): 21-36, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-33541062

RESUMEN

Use of the so-called distalizing mechanics is a common treatment to correct class II malocclusion. One of the first appliances made for molar distalization was the pendulum, which resulted immediately efficient. The knowledge of pendulum efficacy, in regards to distalizing treatment in adolescence, has guided the research to analyze pendulum effect in childhood: checking the pre-eruptive, natural and distal movement of upper second premolar following first upper molar distalization in order to obtain an advance resolution on Angle's Class II patient, limited treatment time, reduced periodontal inflammation and stress on permanent teeth root. A pilot study testing the possibility of a prospective study was necessary on 6 patients treated following an accurate protocol (6 months and 1-year Rx control) and 6 patient control after one year. Statistical analysis by T-Test was done. Oral hygiene controls every month were done. Second upper bicuspid vertical (1.6mm) and sagittal (2.5mm) movement mean values allow to emphasize a distal variation of tooth axis inclination of treatment group than control group, and a second upper bicuspid distal departure from "gubernaculus dentis" of second deciduous molar in treated patients. Periodontal inflammation appears inexistent on second and first upper premolar germs after the comparison between RX exam of treatment and control groups because of exploiting deciduous teeth. Besides periodontal inflammation and teeth root stress on first upper molar of treatment group, after RX analysis, results were limited compared to control groups because of the advanced orthodontic interceptive treatment during a previous stage of first upper molar root development.


Asunto(s)
Maloclusión Clase II de Angle/terapia , Aparatos Ortodóncicos , Técnicas de Movimiento Dental/instrumentación , Técnicas de Movimiento Dental/métodos , Adolescente , Niño , Humanos , Maloclusión Clase II de Angle/cirugía , Maxilar/cirugía , Diente Molar/cirugía , Proyectos Piloto , Estudios Prospectivos
15.
Artículo en Inglés | LILACS-Express | LILACS, BBO - Odontología | ID: biblio-1091647

RESUMEN

Abstract Objective: To approbate the complex approach for assessment of second molar mesialization outcomes with the use of orthodontic mini-implants. Material and Methods: The sample consisted of 62 patients, divided into study (n=32) and control group (n=30). Mesialization procedure in the study group was conducted with the use of braces system and orthodontic mini-implants as additional anchorage devices, while in control group mesialization was provided only with the use of the brace system. Dynamic registration of bone level changes and the entire range of tooth movement were carried out on digital orthopantomograms obtained with the use of Planmeca ProMax 2D. Results: Findings of orthopantomographic (OPG) analysis have shown that cases of second molar mesialization with the use of mini-implants as temporary anchorage characterized with more stable conditions of bone levels around displaced teeth compare to cases, where mesialization was provided only with the use of braces systems without any additional anchorage. The terms of treatment in the study group with the use of dental mini-implants as the anchorage was reduced by 8.8 ± 0.12 months compared to the control group (p<0.05). Conclusion: The use of orthodontic mini-implants as anchorage constructions during the mesialization of the mandibular second molars contributes to the reduction of treatment duration and support the more prognostic movement of teeth, that does not provoke significant pathological changes in the levels of the surrounded alveolar ridge and minimize the risk of associated periodontal complication occurrence.


Asunto(s)
Humanos , Masculino , Femenino , Adolescente , Técnicas de Movimiento Dental/métodos , Radiografía Dental Digital/instrumentación , Diente Molar , Ortodoncia Correctiva , Ucrania , Análisis de Regresión
16.
Artículo en Inglés | LILACS-Express | LILACS, BBO - Odontología | ID: biblio-1135516

RESUMEN

Abstract Objective: To systematically review the hyalinization of experimental tooth movement in humans and animals. Material and Methods: The electronic databases of MEDLINE, PubMed, Cochrane Library, Embase, Institute for Scientific Information, and Google Scholar were searched for performing a systematic review of the related literature published until 2019. Moreover, Endnote X9 software was utilized to manage electronic titles. The searches were fulfilled using keywords of "hyalinization," "orthodontic tooth movement" OR "OTM" AND "periodontal ligament" OR "PDL," "molecular pathways," AND "mechanical cell." Therefore, this systematic review was conducted based on the key consideration of the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) statement. Results: Forces ranged between 2.3 and 50 CN had been applied. According to the research design, incisors had been included in two experiments, whereas maxillary molars had been displaced by tipping forces in another rat examination. However, a majority of investigations had stated that hyalinization had firstly appeared within the first 24 hours. Moreover, the amount of prostaglandin-end peroxide synthase 2 (PTGS2) had been positively related to force term and size utilizing Western blotching. As PTGS2 had been included in the prostaglandin E2 (PGE2) metabolism, the up-regulation of PTGS2 gene expression could be connected with that of PGE2 emission. Conclusion: Gene expression in connection with force term and size and also the first signalling pathways were recognized utilizing protein-protein interactions (PPIs).


Asunto(s)
Humanos , Animales , Ortodoncia , Ligamento Periodontal , Técnicas de Movimiento Dental/métodos , Metaanálisis como Asunto , Revisiones Sistemáticas como Asunto , China/epidemiología
17.
Pain Res Manag ; 2019: 6271835, 2019.
Artículo en Inglés | MEDLINE | ID: mdl-31772695

RESUMEN

Background: This first-in-human study in Saudi orthodontic patients has evaluated the role of low-level laser therapy (LLLT) in pain perception (PP). The outcome of single application of LLLT with 4 different treatment modalities (TM) on PP are evaluated following orthodontic bracket bonding on maxilla. Materials and Methods: A prospective clinical intervention with implementation of parallel technique in each group, 32 orthodontic patients with ectopic canine requiring fixed orthodontic appliance were enrolled and randomly allocated to the 4 groups: LLLT + self-ligating (SL) bracket, LLLT + conventional (Conv.) bracket, non-LLLT + SL bracket, and non-LLLT + Conv. bracket. Orthodontic bracket bonding from 1st molar to 1st molar and superelastic 0.012 inch NiTi were applied for the maxilla. For each patient, maxillary 1st molar to molar received a single application of LLLT using a 940 nm Ga-Al-As laser device on 5 different points labially/buccally and palatally. Main outcome measure was the degree of PP score during the 1st week of orthodontic tooth movement (OTM) after 4 hours, 24 hours, 3 days, and 7 days of both LLLT and non-LLLT treatment applications. A questionnaire with an 11-point numeric rating scale (NRS) was used for PP. Results: Mean ± SD of PP in the LLLT + SL group was 3.33 ± 1.4, 3.58 ± 1.06, 2.31 ± 0.67, and 1.89 ± 0.54 in 4 hours, 24 hours, 3 days, and 7 days, respectively. Compared to all 4 TM groups, LLLT groups showed better PP. More statistically significant differences were found in LLLT groups. No harms were encountered. Limitations: The intervention provider and the patient were not blinded to the intervention. Conclusion: The LLLT + SL group revealed significantly promising benefits on PP during OTM.


Asunto(s)
Terapia por Luz de Baja Intensidad/métodos , Soportes Ortodóncicos/efectos adversos , Manejo del Dolor/métodos , Dolor/etiología , Técnicas de Movimiento Dental/métodos , Adolescente , Adulto , Femenino , Humanos , Masculino , Dolor/prevención & control , Dimensión del Dolor/métodos , Percepción del Dolor/efectos de la radiación , Estudios Prospectivos , Arabia Saudita , Encuestas y Cuestionarios , Técnicas de Movimiento Dental/efectos adversos , Adulto Joven
18.
Am J Orthod Dentofacial Orthop ; 156(4): 453-463, 2019 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-31582117

RESUMEN

INTRODUCTION: Extraction of one mandibular incisor in adolescents and adults can simplify orthodontic treatment in 2 major circumstances: (1) severe crowding of the mandibular but not the maxillary incisors, and (2) mild anterior crossbite with good alignment in both arches. Despite its potential advantages, this method has had limited use in most practices. There have been 3 major objections: (1) the possibility of unsightly black triangles because of loss of interdental papilla height, (2) a possible tooth size discrepancy that would affect occlusal relationships, and (3) patient concerns about a visible extraction site. All 3 objections now can be overcome. METHODS: For 37 consecutively treated single-incisor-extraction patients, preparation of the extraction site for the tooth to be extracted was done by tipping it lingually while simultaneously closing the space in front of it. Treatment outcomes and the effect of age at the time of treatment were evaluated. RESULTS: In patients below age 20, this approach eliminated post-treatment black triangles and almost eliminated partial loss of the interdental papilla. It reduced the previously reported prevalence of these problems in patients aged 20-40 years and did not seem to be helpful in those aged over 40 years. This positive effect was achieved because of maintenance of alveolar crest height that supports the interdental papillae. Tooth size discrepancy caused by incisor extraction was largely compensated by the different labio-lingual orientation of maxillary and mandibular anterior teeth. The extraction space quickly disappeared during extraction site preparation. CONCLUSIONS: The new procedure of extraction site preparation described in this paper offers more favorable outcomes for post-treatment prevalence of black triangles in younger patients but shows limited efficacy in older patients. Camouflage of a mild skeletal Class III problem is the major indication for this extraction pattern. About 3% of Icelandic orthodontic patients appear to be good candidates for this treatment, and this finding should be reasonably generalizable to other populations of European descent.


Asunto(s)
Incisivo/cirugía , Mandíbula/cirugía , Extracción Dental/métodos , Técnicas de Movimiento Dental/métodos , Adolescente , Adulto , Anciano , Cefalometría/métodos , Niño , Estética Dental , Femenino , Humanos , Islandia , Incisivo/diagnóstico por imagen , Masculino , Maloclusión de Angle Clase III/terapia , Mandíbula/diagnóstico por imagen , Persona de Mediana Edad , Fotograbar , Resultado del Tratamiento
19.
Am J Orthod Dentofacial Orthop ; 156(4): 512-521.e6, 2019 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-31582123

RESUMEN

INTRODUCTION: This prospective cohort study aimed to evaluate canine substitution supported by skeletal anchorage as a viable treatment protocol for patients with maxillary lateral incisor agenesis (MLIA) and skeletal Class I or Class III. METHODS: Patients (n = 30) who met the following criteria were recruited: (1) bilateral MLIA or unilateral MLIA with a riziform contralateral incisor with a planned extraction; (2) skeletal Class I or Class III; and (3) dentoalveolar discrepancy in the mandible <5 mm. The archwire sequence routine was administered, combined with a rapid palatal expander, temporary intraoral skeletal anchorage device, and intermaxillary traction with Class III elastics. The results of the cephalometric analyses, peer assessment rating indexes, and the patient's smile self-evaluation using the visual analog scale were compared between initial and final treatments. RESULTS: This study indicated that closing the space in patients with Class I or Class III malocclusion by using temporary intraoral skeletal anchorage devices in the mandible, along with Class III elastics, yielded satisfactory outcomes. Proper occlusion was established by mesialization of the maxillary teeth and correction of the intermaxillary discrepancy, thereby yielding beneficial and significant cephalometric changes after the treatment. The soft tissue profile was maintained when it was harmonious before the treatment and improved posttreatment in patients in whom the profile was initially inharmonious. All occlusions improved, as evidenced by the peer assessment rating index. Smile esthetics were also enhanced after orthodontic treatment for all patients. CONCLUSIONS: Canine substitution may be safely offered to patients with Class I and Class III skeletal pattern and MLIA.


Asunto(s)
Anodoncia/terapia , Diente Canino , Maloclusión de Angle Clase III/terapia , Maloclusión Clase I de Angle/terapia , Métodos de Anclaje en Ortodoncia/métodos , Técnicas de Movimiento Dental/métodos , Adolescente , Cefalometría , Niño , Terapia Combinada , Estética Dental , Aparatos de Tracción Extraoral , Femenino , Humanos , Masculino , Técnica de Expansión Palatina , Estudios Prospectivos , Resultado del Tratamiento , Escala Visual Analógica , Adulto Joven
20.
Int Orthod ; 17(4): 806-816, 2019 12.
Artículo en Inglés | MEDLINE | ID: mdl-31477527

RESUMEN

The treatment of skeletal deep bite does not remain stable. The patient was a Japanese woman aged 16 years and 10 months. Her chief complaint was maxillary protrusion. The degree of overjet was + 10.5 mm and overbite was + 5.0 mm; the intermolar relationship was Angle Class II. An excessive curve of Spee was observed in the mandibular arch. A hypodivergent skeletal pattern was indicated by a small mandibular plane angle and gonial angle. The maxillary incisors were proclined and the mandibular incisors were retroclined. Based on the above findings, the patient was diagnosed with Angle Class II maxillary protrusion and deep bite with hypodivergency. Both maxillary first premolars were extracted and orthodontic treatment was performed using multi-bracket appliances. A proper overbite was achieved by 5.0 mm intrusion of the mandibular incisors. The maxillary incisors were retracted by 11.2 mm and a proper overjet was achieved. Good treatment results were obtained without apical root resorption. After 2 years of retention, the occlusion has been well maintained. This report may constitute a remarkable suggestion for treatment of an unstable deep bite.


Asunto(s)
Incisivo , Maloclusión Clase II de Angle/terapia , Maxilar , Métodos de Anclaje en Ortodoncia/métodos , Sobremordida/terapia , Técnicas de Movimiento Dental/métodos , Adolescente , Diente Premolar , Cefalometría , Modelos Dentales , Oclusión Dental , Femenino , Humanos , Maloclusión Clase II de Angle/diagnóstico por imagen , Mandíbula , Métodos de Anclaje en Ortodoncia/instrumentación , Soportes Ortodóncicos , Alambres para Ortodoncia , Sobremordida/diagnóstico por imagen , Técnicas de Movimiento Dental/instrumentación , Resultado del Tratamiento
SELECCIÓN DE REFERENCIAS
DETALLE DE LA BÚSQUEDA
...