Guiding Planes and Path Insertion Critical RPD Stability
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Guiding Planes and Path Insertion Critical RPD Stability
- 1. Surveying removable partial dentures: the importance of guiding planes and path of insertion for stability INDIAN DENTAL ACADEMY Leader in continuing dental education www.indiandentalacademy.com www.indiandentalacademy.com
- 2. Introduction • When performing oral rehabilitation with removable partial dentures (RPDs), the objective of the dentist should be to make a prosthesis that the patient can easily seat and remove from the mouth and yet, when seated, the prosthesis will resist the dislodgment potential caused by masticatory function, especially mastication of sticky foods. www.indiandentalacademy.com
- 3. • A diagnostic cast should be surveyed for three major reasons : – determination of the path of insertion to obtain efficient and esthetically pleasing retentive clasps – tracing the survey line to enable positioning of the rigid parts of the prosthesis, so they will seat without interference – analysis of the contour of soft tissues to prevent the occurrence of lesions that result from seating the prosthesis. www.indiandentalacademy.com
- 4. Guide planes • The flat axial surfaces in an occlusal- gingival direction on abutments are referred to as guiding planes. They should be prepared to be parallel to one another and to the path of insertion as determined by the surveying stylus. These surfaces very seldom occur naturally and need to be prepared directly on enamel or on cast or composite restorations. www.indiandentalacademy.com
- 5. • During insertion, the rigid parts of the prosthesis contact with these surfaces, which direct the movement of the RPD until it is seated securely in the predetermined terminal position in the mouth. www.indiandentalacademy.com
- 6. Undercut surfaces • The inclination given to the cast in relation to the surveying stylus (path of insertion determined for the prosthesis) should result in undercuts on the abutments measured gingivally from the survey line. The undercuts should be proportionally equal in depth and convergence angle on all abutments and should permit the retentive clasp tips to engage the undercut in the gingival third of the tooth www.indiandentalacademy.com
- 7. Inteferences • In the determination of the path of insertion, it is important to detect and resolve the presence of interference from structures other than teeth that will interfere with the placement of the prosthesis, such as exostoses, soft tissue, and undercut ridges. www.indiandentalacademy.com
- 8. Determination of the path of insertion www.indiandentalacademy.com
- 20. Thank you For more details please visit www.indiandentalacademy.com www.indiandentalacademy.com