Enrique Grageda Núñez

Resistencia a fuerzas de tracción de miniimplantes usados en ortodoncia dependiendo del ángulo de inserción

For maximum anchorage in orthodontics, mini-implants have been used for various tooth movements without causing unwanted reactive forces on the teeth. The purpose of this study was to evaluate the mechanical resistance to traction of mini-implants to be evicted from bone and assess whether they can increase their tensile strength depending on its insertion angle (60 and 90 o ). Pig hip cuts were used for the placement of 5 mini-implants which were inserted with a 60 o angulation and a 90 o angulation. Ten new 2.5 mm (neck) x 1.6 (diameter) x 8 mm (length) with fl at head self- drilling mini-implants were used (MOSAS Dewimed. Germany). They were subjected to perpendicular tensile forces, using a universal mechanical testing machine (Instron) with a loading rate of 1 mm/min. The results were analyzed using Students t test. It was observed that 90 o angulation

Guardar un diente, ¿salva una vida?

Este es tan solo uno de los estandartes que bancos de celulas madre dentales se han encargado de publicitar sin etica alguna, invir-tiendo fuertes cantidades de recursos economicos en medios masivos de comunicacion y con conferencias en foros odontologicos por parte de «asesores cienti-fi cos» patrocinados por estos bancos y dirigidas a las comunidades odontologicas de nuestro pais.Las expectativas producidas despues del anuncio del aislamiento de estas celulas a partir de dientes temporales en el 2003 por el Dr. Shi, quien es pro-fesor del Centro de Biologia Craneofacial de la Uni-versidad del Sur de California,

Another orthodontic magazine

This article can be read in its full version in the following page: http://www.medigraphic.com/ortodoncia that continue spreading their fear and pessimism to a new generation of students and orthodontists eager to begin a mindset change in our country. It really is ironic that the fi rst dental journal devoted exclusively to orthodontics published by Edward Angle in 1907 probably had a similar goal in its foundation: establishing an environment that allowed to publish the knowledge and scientific research in order to amalgamate a specialty that although there was already awareness of it, was not fully established within dentistry. It is essential to carry out in Mexico and Latin America publications with features that allow us to share the orthodontic knowledge here produced with other parts of the world. The edition of a scientific magazine additionally permits the improvement of the quality of the research that is performed in the various graduate programs in orthodontics; it also increases healthy competitiveness between universities and specialists, encourages research by having an environment where one can expose it and share it, submits to open criticism the results of the study to the guild of our specialty and eventually creates knowledge that makes it easier for the orthodontist to make clinical decisions based on scientifi c evidence.

Orthopedic expansion with orthodontic mini-implants: Case report

The goal of any orthodontic treatment is to achieve the desired movement of the teeth with minimal side effects. Mini-implants have biomechanical advantages that promote a more effective and efficient treatment. The use of orthodontic mini-implants for orthopedic maxillary expansion can considerably reduce undesired tooth movement. A clinical case report of a 13-year-old female who was diagnosed with a collapsed maxilla and treated with an acrylic device with an expansion screw anchored to two miniimplants placed in the palate and in the first molar for the expansion of the maxilla. The aim of this clinical case study was to analyze the separation of the maxillary suture by using orthodontic miniimplants, evaluate the transversal changes at the skeletal and dental level and the secondary effects induced in the teeth used as anchorage. Skeletal changes achieved in the patient treated with mini-implants were: maxillary width increased 3 mm; regarding the dental changes, an increase in the intercanine distance of 3 mm and an 8 mm increase in the interpremolar and intermolar distance were observed. The secondary effect caused to anchorage teeth was buccal tipping of the first molars; in average, the right molar 1° and the left molar 4°. Orthodontic mini-implants are a reliable source for orthopedic anchorage since they provide acceptable skeletal changes with minimal side effects in teeth used as anchorage. Key words: Expansion, orthopedics, maxilla, mini-implants

Resistance to traction forces in mini-implants used in Ortohodontics depending on the insertion angle

For maximum anchorage in orthodontics, mini-implants have been used for various tooth movements without causing unwanted reactive forces on the teeth. The purpose of this study was to evaluate the mechanical resistance to traction of mini-implants to be evicted from bone and assess whether they can increase their tensile strength depending on its insertion angle (60 and 90o). Pig hip cuts were used for the placement of 5 mini-implants which were inserted with a 60o angulation and a 90o angulation. Ten new 2.5 mm (neck) x 1.6 (diameter) x 8 mm (length) with fl at head self- drilling mini-implants were used (MOSAS Dewimed. Germany). They were subjected to perpendicular tensile forces, using a universal mechanical testing machine (Instron) with a loading rate of 1 mm/min. The results were analyzed using Student’s t test. It was observed that 90o angulation mini-implants had better resistance (7.40 ± 2.68 Mpa) than 60o angulation ones (4.21 ± 0.58 Mpa). 90o angulation mini-implants could be a better option for orthodontic treatment due to their higher resistance to traction forces thus improving stability. Key words: Anchorage, miniscrews, tensile strenght.

Corrección de mordida abierta mediante intrusión de molares con mini-implantes

Anterior open bite is a malocclusion in which one or more teeth do not make contact with its antagonists. The malocclusion occurs in the incisors zone and can spread even to posterior teeth. Molar intrusion is one of the main treatment mechanisms, but the methods used to achieve it have been ineffective, mainly because they depend on dental structures resulting in anchorage loss. On the other hand, mini-implants are easy to place, remove and a lowcost alternative to treat anterior open bite. They are an efficient tool to provide anchorage without patient cooperation. This article explains how closure of an anterior open bite was achieved using mini-implants in the maxilla (buccal and palate area with an acrylic button with hooks) and mandible (buccal area). It aims to explain that mini-implants are effi cient in causing molar intrusion because they provide more options to correct malocclusions without patient’s cooperation.