The first molar of youth is often extracted for seriously caries or without long term good effect after therapy because the first molar is often misunderstood as deciduous tooth by parents and therefore it is regarded as unnecessary to treat. For such young patients, the corresponding ipsilateral first molar caries while third molars (or germ) existing with crown well-developed,we can exact the first molar and move the second molar by segmental arch technique. In this way, we can quickly shift the second molar to the desired location, increases the efficiency and reduce both dental movement and period of treatment.

The confirmation of maxillomandibular relation is the key step to manufacture complete denture. Certain kind of transformation and shift will lead to the inaccuracy in the progress of the confirmation of maxillomandibular relation, while these problems could be avoided by applying remodified vacuum-formed occlusal pad. In this way, accuracy of the confirmation of maxillomandibular relation and the clinical effect can be enhanced.