Efficacy Of Orthodontic Treatment Research Articles

Relationship of orthodontic treatment and periodontal hard tissue health

Periodontal tissue, especially the alveolar bone, are closely associated with the progress and efficacy of orthodontic treatment. Prior to and during orthodontic treatment, dentists should fully evaluate the status of periodontal hard tissues to prevent clinical problems. This article aims to discuss bone issues associated with orthodontic treatment, including gingival papilla absence, alveolar bone insufficiency, excessive cortical resistance, and altered passive eruption, etc. The mechanism and prevention methods of these problems are also described.

Residents' journal review

Residents' journal review

Positive resist material requirements for VLSI device fabrication. Part I : David J. Elliott. Solid St. Technol., 116 (May 1982)

This chapter provides information about the chemical structure of the popular thermoplastic orthodontic aligners, analyzes their mechanical properties for the as-received condition and after intraoral or artificial aging, and discusses the impact of these alterations on the efficacy of orthodontic treatment. Invisalign aligners are constructed from a thermoplastic polyurethane. Other manufacturers make greater use of polyethylene terephthalate glycol. Orthodontic forces delivered by thermoplastic appliances depend on amount of activation, material, thickness, and thermoforming process. However, in each aligner, most tooth movement occurs within the first 24 h. A strong correlation exists between mechanical properties, mainly hardness and elastic modulus, of the thermoplastic materials and force produced by the appliances. Additionally, appliances with higher hardness are expected to demonstrate better wear resistance. Aging causes a decrease of the residual stress within all materials with time and a deterioration of their clinical properties. The impact of this deterioration in tooth movement is not always clear. These materials absorb water with time and expand hygroscopically. Aligners were found not to release traceable monomers or by-products after short-term in vitro aging. Moreover, they did not seem to induce cytotoxic and estrogenic effects.