RECORD BASE AND OCCLUSAL RIM Dr Ali Ehsan

RECORD BASE AND OCCLUSAL RIM Dr. Ali Ehsan Kareem B. D. S. , M. Sc. /prosthodontist

Record bases (denture base) Uses: 1. 2. 3. 4. Support of the occlusal rims. Recording maxillomandibular relation. Carry of artificial teeth to perform try in procedure. Gives an idea about the contour and aesthetics of the denture.

Requirement of record bases: 1. The borders should be resemble a finished denture without reduction. 2. All surfaces that contact lips, cheek and tongue should be smooth and rounded. 3. The crest and labial and/or buccal slopes should be thin (1. 5 mm) to provide space for teeth arrangement.

Uses of bite rims: 1. Determination of of maxillomandibular relation, including: 2. Setting up or arrangement of teeth. 3. Orientation of occlusal plane. 4. Determination the shape of the arch. 5. Support of the facial muscles 6. Selection of teeth, includes determining of: *midline position: *canine lines position: *width of 6 anterior teeth: *width of posterior teeth: * high lip line: *low lip line:

Occlusal rims (bite rims or wax rims): wax form constructed on record bases used for recording jaw relation and teeth arrangement. Maxillary occlusion rim features: 4 mm 22 mm 18 mm 6 -8 mm 7 mm Mandibular occlusion rim features: 18 mm

Occlusal plane: Fox bite: Note: The best anatomic guides aid in determining the proper contouring of the anterior section of both occlusion rims are: 1. The nasolabial sulcus 2. The mentolabial sulcus 3. The philtrum 4. The commissure of the lips Nasolabial sulcus Philtrum Under support Over support Commissure of the lip Mentoolabial sulcus