Abstract

Biomechanics, Materials and Shape Memory Aligners

by Nanda Ravindra

Orthodontics specialty is quite unique and different than medicine as far as introduction of new devices is concerned as well as existing treatment modalities. There is a serious lack of randomized trials and prospective studies as noted by various systematic reviews and meta-analyses. Almost always new devices are being marketed by the orthodontic companies without any background evidence- based research or peer reviewed publications. This presentation will concentrate on how aligners and temporary anchorage devices (TADs) were introduced and adopted by the orthodontic profession without any supportive data about their efficacy for treating various malocclusions Most of the understanding of biomechanics and research related to TADs has been exemplary few years after their introduction. Unfortunately, it is not the same with aligners. Research studies on aligners lagged considerably during the first 15 years or so following their introduction. Only in recent years research has shown limited efficacy of various tooth movements with conventional aligners, pointing out limitations due to inadequate biomechanics, not so optimal attachments, rigid material, and compliance issues.

Learning Objectives

After this lecture, you will be able to understand force system applied by aligners
After this lecture, you will be able to learn shortcomings in efficacy of aligners
After this lecture, you will be able to understand shape memory properties of aligners