Podcast
PROSTHO RPD
Hosted by Dr. Mayakha Mariam · EN
These are lectures of The Gulfie Dentist Online Coaching
10episodes
Episodes
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1. Parts of an RPD
Jan 8, 202200:03:20Tap to summarizePARTS1. MAJOR CONNECTOR2. DIRECT RETAINER3. MINOR CONNECTOR4. INDIRECT RETAINER (if the prosthesis has distal extension)5. BASEMAJOR CONNECTORS Definition:- It is a part of CPD (cast partial denture) that connects the component from one side of the arch to the other side. Major connecter A rigid part of the partial denture casting that unites the rests and another part of the prosthesis to the opposite side of the arch. FUNCTION1. Unification of all other components2. Stress distribution3. Cross arch stabilization Property of— rigidity, which is why it is always placed on a rigid surface Maxillaryo anterior extension — 6 mm* from palate gingival margino Posterior border — anterior vibrating line Mandibular anterior border — 3 mm* from lingual gingiva
Transcribe →2. Maxillary major connectors
Aug 29, 202000:03:51Tap to summarizeMAXILLARY MAJOR CONNECTORS: -A. Complete Palate Major Connectori. Best major connectorii. Like CDiii. There is a plate covering the entire plate, this acts as the major connector.iv. When all post teeth missing, class 1v. Periodontally compromised remaining teeth,vi. Shallow vault cases, small mouth, flat or flabby ridges.vii. Almost anywhere and everywhereB. Anterior—Posterior Bari. Sharp designii. Most rigid after complete palateC. Horse — Shoei. Least preferred as it is least rigidii. Patient with palatal torusD. Single palatal bara. Posterior palatal bar or strip used with: Kennedy class3.E. Single palatal strapF. Unshaped palatal connectorG. Combination of anterior—posterior palatal strapMaxillary RPD major connectors may be beaded to — produce positive contact with the tissueAll major connectors should cross the midline at a right angleQ. Refractory cast To fabricate a removable partial casting requires making a second cast of high heat investment material this cast.
Transcribe →3. Mandibular major connectors
Aug 29, 202000:04:37Tap to summarizeMANDIBULAR MAJOR CONNECTORo Upper border 3 mm from gingivalo Lower border 1st step to designLINGUAL BARo Most commonly usedo Lingual bar is short & thick - used in wide lingual sulcus & lingual frenum is lowo However, there are certain cases where we cannot use lingual bari. Shallow vestibuleii. Lingually high frenal attachmentiii. Alveolar ridge resorptioniv. Lingual toriv. Severe vertical resorptionLINGUAL PLATEa. Can use in above conditionsb. When teeth are periodontally weak also giving splint effectc. Need for the addition of one or more anterior teethd. When teeth lingually inclinedQ. Lingual plate is long & thin - used in shallow sulcus, high lingual frenum, & for splinting mobileanterior teeth.LABIAL BAR
Transcribe →4. Direct Retainers
Aug 29, 202000:02:41Tap to summarizeDIRECT RETAINERSa. Intracoronal (tooth prepared)o Precision attachement- Female on the removable part nd male on the fixed part. o Class III, Class IVo Considering aesthetics- because no claspsb. Extracoronalo More commono Should encircle the tooth at least 180 degree
Transcribe →5. Parts of clasps
Aug 29, 202000:05:19Tap to summarizePARTS OF CLASPRetentive Arm- Retention*a. Orginates from the occlusal third and terminates in the cervical thirdb. Placed on the buccal aspectc. The retentive terminal engages the undercut – ie apical to the highest point of contour / the survey line.d. Rest of the clasp has to be above the hight of contour.e. It has tapering thickness when you talk about shapef. It has to be sated passively, ie no force when already seated, and be only active or provide retention when dislodging forces are applied.Reciprocal Arm- Stability*a. Is placed on the lingual aspectb. It originates from the occlusal third and terminates above the highest point of contourc. Doesn’t have to engage in any undercutd. Resists lateral movement of the prosthesise. Counteracts the force produced by clasp/ retentive armf. Resists potential orthodontic movement of the abutmentBody/Minor connector = stability*Rest = support* to entire armShoulder = connects the parts of clasp assembly, function – stability
Transcribe →6. Types of clasps 1
Aug 29, 202000:05:31Tap to summarizeSUPRABULGE – COMES / ORIGINATES FROMABOVE THE BULGE Akers Ring Combination EmbrasureC clasp , akers clasp , circumferencial, supra bulge, three quarter clasp Universal type of clasp Can be used in almost all cases Only disadvantage is - mobilityRing clasp Lingually tilted tooth, Kennedy class 2, Isolated PM cases When the undercut is near the proximal plate side, the clasp will have to go all around and engage in there. Sometimes there is only one seat, or they might add an additional seat on the opp side as well Also, they could add an additional arm from the meshwork coming infrabulge way, and soldered perpendicular to the lingual part of the arm to provide more stability.Embrasure Clasp 2 Akers clasp hugging both teeth on right and left like a father hugging his two sons with both of his arms Need 2 occlusal rest and has only 1 body Kennedy class IIMultiple Clasp – circleto Periodontally compromisedo 2 occlusal rest and 2 bodyCombination Claspo Distal extension caseso Abutment tooth with severe undercut
Transcribe →7. Types of clasps 2
Aug 29, 202000:04:15Tap to summarizeINFRABULGE- COMES FROM BELOW THE BULGE I bar T bar Modified T bar Y barBar clasp (Gingivaly approaching clasp/ infrabulge) Anterior canines in maxillary Aesthetic situations Most retentive Because canines have very less undercuts. Contraindicationo When there is not enough vestibular deptho When there is undercut in that area – coz it will engage there while removal, and traumatize the tissue, hurt the patientCLASP ASSEMBLIESRPI system R-Rest (always mesial), P-proximal plate, I- I bar MO, distally, buccallyRPA / RPC system R-Rest (always mesial, P-proximal plate , A-akers retentive arms (Always wrought wire) Aker’s retentive — made of wrought wire.Q. Occlusal rest for support (resist vertical forces)
Transcribe →8. Wrought wire alloy
Aug 29, 202000:01:26Tap to summarizeWrought alloy wire * -o Advantages of wrought wire over cast wire flexibility &o Gives less pressure onto the teeth less irritant to abutment.o Used for periodontally compromised and endo treated abutmento more flexibleo soldered onto the frameworkCobalt-Chromium metal –o Metal alloy used to make the frameworko For reciprocal arm
Transcribe →9. Kennedy's Classification
Aug 29, 202000:01:08Tap to summarizeKENNEDY’S CLASSIFICATION:-CLASS 1BILATERAL EDENTULOUS AREA LOCATED POSTERIORTO BOTH REMAINING NATURAL TEETHCLASS IIUNILATERAL EDENTULOUS AREA LOCATED POSTERIORTO THE REMAINING NATURAL TEETHCLASS IIISINGLE EDENTULOUS AREA BOUNDED BY NATURAL TEETH BOTH ANTERIORLY AND POSTERIORLY TO ITCLASS IVSINGLE EDENTULOUS AREA THAT CROSSESTHE MIDLINE AND IS ANTERIOR TO THE REMAINING NATURAL TEETH
Transcribe →10. Indirect Retainer
Aug 29, 202000:02:47Tap to summarizeINDIRECT RETAINER Most commonly used in Kennedy class I, II & IV -ie. Distal extension cases They have the most tipping tendency and need both tooth + tissue support Resistance by preventing lifting off of the distal extension through First order liver principle(see-saw principles) The rest should be fabricated at 90 degrees away and anterior to the fulcrum line Should be placed as far as possible from fulcrum line. Types: auxillary rest — google (PM/canine) -- o Lingual plate major connector + indirect retainer -- o Canine extension from mesial rest
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