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Semelhante a ABUTMENT TOOTH PREPARATION.pptx
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ABUTMENT TOOTH PREPARATION.pptx
- 2. By. Dr Ayesha Sadaf (BDS gold medalist), FCPS(Pak), Affiliate member of RCPS GLASGOW , Consultant prosthodontist SCFHS Abutment tooth preparation for RPD
- 4. MOUTH PREPARATION FOR RPD Pre Prosthetic Mouth Preparation Prosthetic Mouth preparation
- 5. “ Our objective should be the perpetual preservation of what remains rather than the meticulous replacement of what is missing” M . M. De Van
- 6. Pre prosthetic Mouth Preparation ORAL SURGICAL PROCEDURES CONDITIONING OF ABUSED AND IRRITATED TISSUES Periodontal preparations & Restorative procedures Preparation of abutment tooth
- 7. Extraction of Hopeless teeth 1. Non restorable teeth 2. Poor prognosis teeth 3. Teeth which don’t contribute to design of RPD
- 8. REMOVAL OF RESIDUAL ROOTS 1. Residual roots are close to tissue surface 2. R.R are in proximity to abutment teeth 3, Associated pathologies are evident
- 9. Conditioning of abused and irritated tissue Denture stomatitis Aetiology 1. Candida Albicans PREDISPOSING FACTORS • Poor denture hygiene • Vit b 12 deficiency • Trauma from denture • Diabetes mellitus • Immunocompromised patients
- 11. Denture stomatitis PLAQUE DISCLOSING SOLUTION MECHANICAL METHOD TO REMOVE PLAQUE
- 12. Acrylic denture can be immersed in sodium hypochlorite solution daily. Combination of mechanical and chemical method. Denture half treated with sodium hypo chloride for 20 minutes
- 13. Acrylic denture should not be dipped in sodium hypochloride for long period of time
- 17. Abutment tooth preparation (outline) • Objective of abutment tooth preparation • Classification of abutment teeth • Sequence of abutment teeth preparation • Guide planes preparation • Modification of height of contour • Creating undercut areas
- 19. Classification of abutment teeth • Requiring minor modification to enamel of coronal portion (Enameloplasty) • Requiring modification to existing minor restoration • Requiring major restorations i.e, full coverage crowns
- 20. Abutment tooth preparation All proposed preparation should be done on the diagnostic cast usually with the red pencil after initial surveying and designing of RPD
- 21. Sequence of Abutment Tooth Preparation • Establish Guide planes • Modify un favorable survey lines • Create favorable undercut areas • Provide rest seats
- 22. • Guide planes Preparation of guide planes
- 25. Guide planes Advantages PREVENTION OF CLASP DEFORMATION
- 28. Burs Long Cylindrical Carbide or Diamond (8837K 014) 8837K-014 8/14/2022 Dr. Aysha Sadaf 28
- 29. Polish Prepared Surfaces Rubber wheels or points 8/14/2022 Dr. Aysha Sadaf 29
- 30. Guiding Plane Dimensions * Round Axial Line Angles Round Axial Line Angles 2-4 mm 1/2-1/3 height 2-4 mm 1/2-1/3 height 8/14/2022 Dr. Aysha Sadaf 30
- 31. Guiding Plane Dimensions * Use short guideplanes on Class I & II Use long guideplanes on Class III & IV Use short guideplanes on Class I & II Use long guideplanes on Class III & IV 8/14/2022 Dr. Aysha Sadaf 31
- 32. Guide planes preparation 8/14/2022 Dr. Aysha Sadaf 32
- 33. Sequence of abutment tooth preparation Prepare Guiding Planes First * 8/14/2022 Dr. Aysha Sadaf 33
- 34. If Axial Surface Already Parallel to Path of Insertion? •NO Preparation ! 8/14/2022 Dr. Aysha Sadaf 34
- 35. Sequence of abutment tooth preparation Guide planes preparation
- 37. High SURVEY LINE
- 38. CREATING UNDERCUT ONLY LIMITED ENAMELOPLASTY CAN BE DONE IN THE GINGIVAL 1/3
- 40. CREATING UNDERCUT ACID ETCH COMPOSITE IN THE GINGIVAL 1/3 CAN BE USED FOR UNDERCUT CREATION ULTRA FINE AND HYBRID COMPOSITES ARE MORE SUITABLE
Notas do Editor
- PREVIOUSLY U HAVE STUDIED MOUTH PREPARATION FOR RPD, IT’S THE CONTINUATION OF IT, A RECALL
- History of removable prosthesis goes back to 17th century ,when George Washington American president was given a set of partial denture made with ivory , gold and also his natural teeth. In th end he had one tooth remaining.
- 1.Preparation of mouth is fundamental for success of RPD 2. MOUTH preparation works under the philosophy of preservation of what remains
- Preprosthetic mouth preparation follows the preliminary diagnosis and provisional treatment plan. Final treatment plan can be post poned until the desired outcome of moth preparation is achieved. Final impression can be delayed until all preprosthetic mouth preparation have achieved their objectives. Preprosthetic mouth preparation have been divide into four categories. 1. oral surgical procedures 2. conditioning of abused and irritated tissue 3 periodontal preparation 4. preparation of abutment teeth
- Extractions are indicated on diagnostic cast with red pencil, tooth which are non-restorable and cannot be preserved are indicated for extraction before giving RPD
- Denture stomatitis is diffuse inflammation of mucosa due to a fungal infection candida albicans.
- REMOVAL OF CAUSATIVE FACTOR
- IF THE PLAQUE CONTROL IS POOR DENTIST CAN DEMONSTRATE BY PLAQUE DISCLOSING SOLUTION. EXPLAIN THE SIGNIFICANCE OF PLAQUE DEMONSTRATE HOW TO REMOVE IT
- trauma CAUSED BY OVEREXTENSIONS CAN BE REMOVED BY PRESSURE INDICATING PASTE OR SILICONE WASH IMPRESSION
- LOSS OF OCCLUSAL CONTACTS OVER A LONG PERIOD OF TIME AND CAUSE TRAUMA TO DENTURE BEARING AREA. OCCLUSAL ADJUSTMENT CAN BE DONE BY RECORDING NEW JAW RELATION AND PROVIDING OCCLUSAL CONTACTS
- Temporary relining can be done with soft tissue conditioning materials. To soothe the irritated tissue for a short period of time
- After surgery , periodontal treatment, endodontic treatment and tissue conditioning of the arch involved, the abutment teeth may be prepared tp provide support, stabilization, reciprocation and retention.
- Two or more surface of the teeth which are parallel to one another and also to the path of insertion and removal
- It is achieved by resisting forces which are acting on the denture other than the path of insertion
- GUIDE PLANES HELP IN MAINTAINING THE CONTINUOUS. CONTACT OF THE reciprocating element with the tooth.
- 1. IS THE NORMAL POSITION OF CLASP DURING REMOVAL OF DENTURE. 2. WITHOUT GUIDE PLANES CLASP WILL CHANGE HIS POSITION IN OTHER DIRECTIONS AS THE PATIENTB WILL TILT OR ROTATE THE DENTURE
- Guide surface permits an intimate contact with the surface of tooth creating a natural and more aesthetic appearance
- All guide planes should be made parallel to the path of insertion and removal of denture.
- Guiding planes should be at least 1/2 to 1/3 of the axial height of tooth (generally a minimum of 2 mm in height). Lingual guiding planes for bracing or reciprocal arms should be 2-4 mm and ideally be located in the middle third of the crown, occluso-gingivally.
- Guiding planes for distal-extension cases should be slightly shorter to avoid torquing of abutment teeth.
- If occlusal rest seats are prepared initially, placement of a proximal guiding plane will remove some of the rest seat preparation, and result in a narrowed rest with a sharp occluso-proximal angle.
- IF THE MAXIMUM HEIGHT of contour is located more occlusally then it causes deformation of clasp. A high clasp arm is more noticeable to patient and will interfere in masticatio
- 1. DEFORMATION OF CLASP, NOT GOIN INTO THE UNDERCUT 2. ROUNDING OFF SHARP ANGLES WILL ALTER THE SURVEY LINE