For instance, a small void in the impression caused by the trapping of an air bubble on one of the occlusal surfaces results in a nodule on the occlusal table. Flaws in the impressions result in inaccuracies in the casts that easily compound. Articulated diagnostic casts permit a detailed analysis of the occlusal plane and the occlusion, and diagnostic procedures can be performed for a better diagnosis and treatment plan tooth preparations can be “rehearsed” on the casts, and diagnostic waxing procedures allow evaluation of the eventual outcome of proposed treatment.Īccurate impressions of both dental arches are required. Relative alignment and angulation of proposed abutment teeth are easier to evaluate on casts than intraorally, as are many other subtle changes in individual tooth position. On an articulator, these are readily assessed in the occluded position and throughout the entire range of mandibular movement. Other critical information not immediately apparent during the clinical examination includes the occlusocervical dimension of edentulous spaces. If the casts have been articulated in CR, assessing both the CR and the maximum intercuspation (MI) position is possible, because any slide can then be reproduced. If the maxillary cast has been transferred with a facebow, a centric relation ( CR) interocclusal record has been used for articulation of the mandibular cast, and the condylar elements have been appropriately set (such as with protrusive and/or excursive interocclusal records), reproducing the patient’s movements with reasonable accuracy is possible. This enables static and dynamic relationships of the teeth to be examined without interference from protective neuromuscular reflexes, and unencumbered views from all directions reveal aspects of the occlusion not always easily detectable intraorally (e.g., the relationship of the lingual cusps in the occluded position). 2-1) transferred to a semiadjustable articulator are essential in planning fixed prosthodontic treatment.
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