Bending Behaviour of Polymeric Materials Used on Biomechanics Orthodontic Appliances

Abstract

This paper discusses the issues of strength and creep of polymeric materials used in orthodontic appliances. Orthodontic biomechanics is focused on the movement of individual teeth or dental groups as a result of the force applied by orthodontic appliances. Stresses in the construction of functional and biomechanical appliances is generated when using the apparatus in the oral cavity. The orthodontic appliance must maintain its shape and not be damaged during treatment so strength and creep resistance are fundamental properties. It was assumed that the clinical success of orthodontic appliances can be determined by these performance properties. The aim of the work was the experimental assessment of comparative bending strength and creep resistance of selected popular polymer materials used in the production of biomechanical orthodontic appliances. Four commercial materials manufactured by the world class producers were tested: NextDent Ortho Rigid (Vertex-Dental B.V., Soesterberg, The Netherlands) marked as “1A”; Erkocryl (ERKODENT Erich Kopp GmbH, Pfalzgrafenweiler, Germany)-“2A”; Vertex Orthoplast (Vertex Dental B.V.), blue, marked as “3A” and material with the same name as “3A” but orange, marked in the article as “4A”. All the tests were carried out after aging in artificial saliva for 48 h at a temperature of 37 °C. Flexular strength and flexular modulus were made using the three point bending method according to the ISO 178 technical standard. Creep tests were carried out according to the method contained in ISO 899-2. The creep test was carried out in an artificial saliva bath at 37 °C. The creep tests showed significant differences in the strength, modulus and deformability of the tested materials. The strength reliability of the tested materials also varied. The research shows that the 2A material can be used for orthodontic applications in which long-term stresses should be lower than 20 MPa.

Biomecánica en el tratamiento ortodóntico de la mordida profunda anterior

“…La biomecánica ortodóntica se centra en el movimiento de dientes individuales o grupos dentales debido a la fuerza aplicada por los aparatos de ortodoncia, seleccionados, fijos y activados por un ortodoncista. El forzamiento ortodóncico de un cambio dental es el resultado de la aplicación de fuerzas activas al diente (Domagała, et al, 2020).…”

“…No. Especialistas La población de esta investigación denominada biomecánica en el tratamiento ortodóntico de la mordida profunda anterior, son los especialistas (17) en Ortodoncia que labora en clínicas o consultorios de la ciudad de Guayaquil, Machala, Cuenca, Riobamba y Quito. Este trabajo se realizará con una muestra no probabilística, ya que se aplicará el instrumento de levantamiento de información a la totalidad de ortodoncistas.…”

Release and Recharge of Fluoride Ions from Acrylic Resin Modified with Bioactive Glass

“…It includes glass–ionomer cements (GIC), giomers, cermets, compomers, and composite materials with differential fluoride releasing ability [ 7 ]. The newly designed dental materials should have appropriate mechanical properties, should be biocompatible with oral cavity environment, and should have a long service time [ 8 ]. Polymethyl methacrylate (PMMA) is a material commonly used in dentistry.…”

Influence of Build Orientation, Geometry and Artificial Saliva Aging on the Mechanical Properties of 3D Printed Poly(ε-caprolactone)

“…Particularly, the use of polymeric materials has found its applications to promote friction reduction [ 5 ], as drug delivery systems [ 6 ], antimicrobial activity [ 7 ], and corrective orthodontic devices [ 8 ]. Polymers that are used in dentistry applications vary from the most common such as polyethylene, poly(methyl methacrylate), and poly(ε-caprolactone) (PCL) to the less known as the case of polypyrrole and polyhexamethyldisilazane [ 9 ], to give some examples.…”