Prevalence of malocclusion in public school students in the mixed dentition phase and its association with early loss of deciduous teeth.

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.

Evaluation of the rapid and slow maxillary expansion using cone-beam computed tomography: a randomized clinical trial.

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.

Orthodontic traction in a patient with cleidocranial dysplasia: 3 years of follow-up.

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.

In vitro evaluation of force degradation of elastomeric chains used in orthodontics.

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.

Three-dimensional assessment of buccal alveolar bone after rapid and slow maxillary expansion: a clinical trial study.

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.

Evaluation of mechanical properties of five cements for orthodontic band cementation.

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.

Combining traditional techniques to correct anterior open bite and posterior crossbite.

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.

Ideal treatment protocol for cleft lip and palate patient from mixed to permanent dentition.

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.

Palatal configuration in Class II Division 1 malocclusion: a longitudinal study.

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.

Height and width of orthodontically treated palates in Class II Division 1 patients: a longitudinal study.

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.

Analysis of the smile photograph.

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.

Bond strengths and adhesive remnant index of self-etching adhesives used to bond brackets to instrumented and uninstrumented enamel.

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.

Esthetic influence of negative space in the buccal corridor during smiling.

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.

Assessment of treatment for functional posterior cross-bites in patients at the deciduous dentition phase.

The aim of this study was to clinically assess the results of treatment for functional posterior cross-bites by means of selective grinding in individuals at the deciduous dentition phase over a period of 12 months. From a total of 1,011 children examined in the 2-to-6-year age bracket, 26 with functional posterior cross-bites were selected. The sample was divided into 2 groups of 13 children each, group 1 receiving the treatment proposed and group 2 serving as the control group.

Clinical comparative study of the effects of two types of mandibular space-regaining devices.

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.