logging in or signing up the rpi system abhirams Download Post to : URL : Related Presentations : Let's Connect Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Copy embed code: Embed: Flash iPad Dynamic Copy Does not support media & animations Automatically changes to Flash or non-Flash embed WordPress Embed Customize Embed URL: Copy Thumbnail: Copy The presentation is successfully added In Your Favorites. Views: 7489 Category: Education License: All Rights Reserved Like it (1) Dislike it (1) Added: March 18, 2010 This Presentation is Public Favorites: 2 Presentation Description rest, proximal plate, i bar Comments Posting comment... By: aisha.alisha (34 month(s) ago) nice Saving..... Post Reply Close Saving..... Edit Comment Close Premium member Presentation Transcript The RPI System. : The RPI System. Dr. Abhiram.S BDS Contents : Contents Introduction Direct retainers Clasps I bar removable partial denture RPI INTRODUCTION : INTRODUCTION RPI stands for: Rest. Plate (proximal). I bar clasp. INTRODUCTION : INTRODUCTION Modified I bar retainer system Krol 1973 Principle “stress control with minimal tooth and gingival coverage” Direct retainers : Direct retainers Intracoronal retainers Extracoronal retainers Precision semi precision extra coronal attachment clasp It is that component part of a removable partial denture that is used to retain and prevent dislodgement, consisting of a clasp assembly or a precision attachment --GPT CLASPS : CLASPS On basis of DESIGN Circumferential clasps Bar clasps Aker Reverse aker Recurved Extended Half and half Embrasure RPA Multiple Ring Back action Reverse back action T shape Half T U shape RPI C shape L shape I shape I bar RPD : I bar RPD Kratochvil To reduce tooth contact of the retainer I bar rpd Regular rpd : I bar rpd Regular rpd Mesial rest I bar retainer Long guide planes extending into tooth tissue junction Distal rest Occlusally approaching Normal guide planes Design concepts : Design concepts Distal Mesial Slide 11: Mesial rest --minor connector Major connector Reasons -elimination of harmful effects due to horizontal forces -mesial tipping -fulcrum line away from edentulous ridge Slide 12: Proximal plates -additional proximal plate on distal surface -2-5 mm occlusogingivally -long guide plane Advantages: Increased horizontal stability Better retention Good reciprocation Distributes occlusal load uniformly across the arch Slide 13: I bar -Modified bar or roach clasp -Long tapering arm with a half round cross-section -Placed on buccal surface of abutment, mesial to the mesiodistal height of contour -Should extend about 2 mm above the tooth tissue junction Slide 14: Advantages -Minimal tooth coverage -Passive Disadvantages -Reduced retention -Less horizontal stability than its counter parts Other parts : Other parts Major connector Minor connectors Denture base connectors Slide 16: Modifications of I bar RPDs Rest, Proximal plate and I bar Rest, Proximal plate and Aker’s clasp Rest, Proximal Plate and I-bar (RPI) : Rest, Proximal Plate and I-bar (RPI) RPI uses : RPI uses Used for distal extension base partial denture & provide stress release. -Kennedy class I and class II Modifications in RPI : Modifications in RPI Mesial rest modification -molars-triangular fossa -canines-mesial marginal ridge Slide 21: Proximal plate modification -Design modification I marginal ridge to junction between cervical and middle third -Design modification II extends along entire length of proximal surface of abutment -Design modification III contacts just about 1 mm of gingival third of guiding plane of abutment tooth Slide 23: I bar modification -Tip is pod shaped to allow more tooth contact -To compensate for the decreased encirclement Slide 24: Advantages: -kinder on the abutment. -has stress-breaking action. -no stress on the tooth. -passivity Thank you… : Thank you… You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.