Bidimensional Technique Theory and Practice

sures. The section on “Elastic wear motivation” includes patient compliance, appointment intervals for elastic wearers, limitations and warning signals of elastic wearing, headgear instruction, and motivational ideas. The next 3 chapters outline the biomechanics of elastic forces used in Class I, Class II, and Class III malocclusions. Included in these chapters are the indications and clinical applications for the various elastic types, elastomeric chains and associated problems, Class II molar extrusion and how to combat it, and possible TMD problems in Class III treatment. Particular intermaxillary elastics, such as rectangular, U-shaped, delta, Vshaped, M-shaped and W-shaped, accordion, and Class II triangular, are shown in a separate chapter. Similarly described are extraoral elastic forces used in Class I, Class II, and Class III headgear and a variety of Class III face masks and chincups. In the chapter entitled “Rationale for elastic prescription,” the author discusses how to prescribe elastics, taking into consideration vertical, transverse, and sagittal dimensions and relationships. In many texts, the precise placement of elastics, indications and contraindications, elastic types, force values, and side effects are either largely omitted or only casually debated. This uniquely formatted “all you ever wanted to know about elastics and their clinical application in orthodontics” volume should adequately fill that void. Orthodontists and orthodontic residents should benefit from reviewing this well-referenced and beautifully reproduced book.