Partial denture obturator with conus crown restored remaining teeth (canine and two premolars) served as postoperative maxillary defect which was classified into Aramany's Class I category. Impression of denture bearing area, including defect periphery, was made by the dynamic impression technique to obtain the maximum support. Bilateral occlusal contact was applied on the defect side and canine guided occlusion (disclusion) was provided on the opposite side to prevent rotation of the obturator during lateral excursion. The stability of the obturator prosthesis depends upon good retention of the conus crown. The obturator prosthesis could preserve remaining teeth and tissue, and restored adequate functions, speech, deglutition, and mastication.
The results of improvement were as follows;
1. An oral seal was confirmed by the standard lung function test and monitoring image during swallowing sequence by X-ray video fluorography. It created a good function of speech and swallowing.
2. The stability, retention and support of the obturator prosthesis applied by conus crowns, dynamic impression technique and occlusion could decrease the rotation and mobility of the obturator. It provided adequate mastication.
3. Conus crowns cause not only direct retention but also secondary splinting effects on remaining teeth. Mobility of remaining teeth decreased after wearing a prosthesis in spite of a large defect of denture bearing capacity.
