INTRODUCTION
Functional appliances act by changing the spatial relationship of the mandible in relation to maxilla. This is accomplished by the means of forward repositioning of the mandible by making a CONSTRUCTION BITE
Bite registration means register the bite by intermaxillary wax record used to relate mandible to maxilla in the three dimensions of space. For the success functional appliance -- Determination of the proper construction bite is critical
Even with great attention to the diagnostic assessment , the functional pattern, Depth of overbite, Relative position of maxilla to cranial base, Amount of sagittal discrepancy, direction of growth are important for this determination
Some principles should be clearly understood and if these principles are followed , it is possible describes the positioning of mandible in three planes of space like sagittal , vertical and transverse
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