Prof. Johnson Hsin-Chung Cheng

Efficiency in this context refers to achieving the best possible results in the shortest amount of time, using the simplest devices, and at the most appropriate timing. The purpose of this report is to present orthodontic treatments for anterior crossbites and complex cases of horizontally impacted mandibular second molars using simple and efficient spring appliances.

Traditionally, various types of devices have been used to correct anterior crossbites, each with its own advantages and disadvantages. One such device is the lingual arch with finger springs. I have used this device for over two decades and have developed simplified and effective treatment modalities based on it. This report includes a study using finite element analysis to determine the optimized design of the appliance, followed by its application in clinical cases. Statistical analysis confirmed the effectiveness of the treatment. The report outlines a step-by-step guide on how to bend and apply this simple orthodontic appliance, as well as its scientific effects, based on 30 clinical cases.

Additionally, I introduce another spring appliance that I personally designed and patented for uprighting horizontally impacted mandibular second molars. The designs of these spring appliances were also optimized using finite element analysis and applied successfully in clinical practice. Clinical studies and complex cases presentations of these treatments will be included in this report.