Orthodontic Replacement of Lost Permanent Molar with Neighbor Molar: A Six-Year Follow-Up.

Extraction is very frequent indication in orthodontic planning, especially when there are crowding, biprotrusion, and aesthetically unpleasant profiles. Next to extraction comes space closure, which represents a challenge for orthodontists because of extended treatment time, discomfort created for the patient, tissue tolerance, and stability concerns. When it comes to what mechanics to choose for space closure, loops present two major advantages in relation to sliding mechanics: absence of abrasion and possibility to reach pure dental translation.

Impaction of Maxillary Central Incisors: Surgical and Orthodontic Treatment--Case Report.

The aim of this paper is to report two clinical cases, which was performed with surgical exposure and orthodontic traction of a maxillary central incisors. Light forces were used during the orthodontic treatment applied on rigid wires as anchorage. It was noted that teeth presented adequate clinical crown height and gingival contours.

Scientific use of the finite element method in Orthodontics.

Introduction: The finite element method (FEM) is an engineering resource applied to calculate the stress and deformation of complex structures, and has been widely used in orthodontic research. With the advantage of being a non-invasive and accurate method that provides quantitative and detailed data on the physiological reactions possible to occur in tissues, applying the FEM can anticipate the visualization of these tissue responses through the observation of areas of stress created from applied orthodontic mechanics.

Objective: This article aims at reviewing and discussing the stages of the finite element method application and its applicability in Orthodontics.

Comparison surface characteristics and chemical composition of conventional metallic and nickel-free brackets.

This study aims at comparing conventional and nickel-free metal bracket surface characteristics with elemental composition by scanning electron microscopy (SEM), using energy dispersive spectroscopy (EDS). The sample consisted of 40 lower incisor brackets divided into four groups: ABZ = conventional brackets, Kirium Abzil 3M® (n = 10); RL = conventional brackets, Roth Light Morelli® (n = 10); NF = nickel-free brackets, Nickel-Free Morelli® (n = 10); and RM = nickel-free brackets, Roth Max Morelli® (n = 10). Qualitative evaluation of the bracket surface was performed using SEM, whereby surface features were described and compared.

Impacted permanent incisors associated with compound odontoma.

Odontomas are the most common odontogenic tumours of the maxillary bones, characterised by a slow growth and benign behaviour. They are usually small, asymptomatic and diagnosed after routine radiographic examination. The aim of this study was to report a case of a compound odontoma in the anterior maxilla of a 7-year-old girl, which was causing the impaction of the maxillary right central and lateral incisors, as well as the prolonged retention of the corresponding primary teeth.

Orthodontic Treatment in Adult Patient with Reduced Periodontium: A Case Report.

Patients presenting reduced periodontium represent a major concern for orthodontists. The purpose of this article is to present the clinical case of an adult patient who presented sequel of periodontal disease (diastemas) compromising her dental aesthetics. She was subjected to an orthodontic treatment with the application of light forces distant from the teeth with reduced periodontium.

Nicotine effect on bone remodeling during orthodontic tooth movement: histological study in rats.

Introduction: Nicotine is harmful to angiogenesis, osteogenesis and synthesis of collagen.

Objective: The aim of this study was to investigate the effect of nicotine on bone remodeling during orthodontic movement in rats.

Methods: Eighty male Wistar rats were randomly divided into three groups: Group C (control), group CM (with orthodontic movement) and group NM (nicotine with orthodontic movement) groups.

Effect of growth hormone in experimental tooth movement.

The aim of this study was to evaluate, by histological analysis, the effect of growth hormone (GH) on periodontal ligament and alveolar bone during experimental tooth movement in rats. Eighty male Wistar rats divided into control (C) and experimental (E) groups were examined after 3, 7, 14 and 21 days under controlled climate conditions. Orthodontic force (30 cN) was applied on the maxillary first molar by an orthodontic appliance.

Differential adhesion of Streptococcus mutans to metallic brackets induced by saliva from caries-free and caries-active individuals.

Aim:   The purpose of this study was to evaluate the influence of saliva obtained from caries-free and caries-active individuals on the adhesion rates of Streptococcus mutans to metallic brackets.

Methods:   The unstimulated whole saliva of four caries-free (decayed, missing, or filled surfaces = 0) volunteers and four caries-active (decayed, missing, or filled surfaces >12) patients were collected. The saliva samples from each group were mixed and clarified.

Influence of anti-inflammatory administration in collagen maturation process during orthodontic tooth movement.

Bone formation is essential to orthodontic tooth movement and bone is formed by collagen. To analyze the collagen maturation process on bone matrix neoformed under nonsteroidal and steroidal treatment during orthodontic tooth movement by polarized microscopy, male Wistar rats (n = 90) were randomly divided into three groups (n = 30): C (control), NSAID (potassium diclofenac) and SAID (disodic phosphate dexamethasone). The animals of the C group received 0.

Facial and dental alterations according to the breathing pattern.

Unlabelled: There is controversy in the literature about possible interaction of the respiratory mode with the facial and dental structures.

Objectives: The aim of this study was to perform a longitudinal assessment of the changes in facial and dental structures in Angle's Class II, division 1 malocclusion individuals, divided according to the respiratory pattern (predominantly nasal or mouth), at two distinct moments of craniofacial development.

Material And Methods: Pogonium and nose measurements were made on the lateral cephalometric tracings (LS'-Pog', LS'-B', B'-Pog', Pog'-PogTeg', Line NB, Pog-NB, N'-Prn, Prn-NPog, N-Prn-Sn, Prn-Sn-LS).

Non-steroidal and steroidal anti-inflammatory use in the context of orthodontic movement.

The early phase of orthodontic tooth movement involves sterile acute inflammation of the periodontal ligament in response to biomechanical forces. Anti-inflammatories are pharmacologic agents used in medical and dentistry clinics. The aim of the study was to analyse the bone remodelling during orthodontic movement under non-steroidal and steroidal treatment.

Organization and quantification of the collagen fibers in bone formation during orthodontic tooth movement.

The organic matrix of alveolar bone is composed fundamentally of type I collagen. Polarized light microscopy provides unique information about the structure, composition and polymerization degree of a variety of organic and inorganic tissues that is not available with other techniques. The aim of this research was to compare two methodologies of polarized light analysis for collagen organization in bone formation during orthodontic tooth movement and determined maturity of collagen over the time.

Effect of 670-nm laser therapy and dexamethasone on tissue repair: a histological and ultrastructural study.

Objective: In this study we investigated the role of extracellular matrix elements and cells during the wound healing phases following the use of low-level laser therapy (LLLT) and anti-inflammatory drugs.

Background Data: There are few scientific studies that characterize the possible interactions of LLLT and anti-inflammatory medications.

Materials And Methods: Thirty-two rats submitted to a wound inflicted with a 6-mm-diameter punch.