Lab procedures/ dental education in india

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Indian Dental Academy: will be one of the most relevant and exciting training

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Lab procedures/ dental education in india

  1. 1. PRODUCTIONPRODUCTION OF MASTER CASTOF MASTER CAST SURVEYING OF MASTER CASTSURVEYING OF MASTER CAST (MAP)(MAP) BLOCKOUT AND DUPLICATIONBLOCKOUT AND DUPLICATION REFRACTORY CASTREFRACTORY CAST WAXING OF PARTIALWAXING OF PARTIAL DENTURE FRAMEWORKDENTURE FRAMEWORK INVESTING OF SPRUEDINVESTING OF SPRUED PATTERNPATTERN ANATOMICANATOMIC REPLICAREPLICA PATTERNPATTERN Contd….
  2. 2. INVESTING OF SPRUEDINVESTING OF SPRUED PATTERNPATTERN BURN OUTBURN OUT CASTINGCASTING FINISHING &FINISHING & POLISHINGPOLISHING ANATOMICANATOMIC REPLICAREPLICA PATTERNPATTERN
  3. 3. STEP I : PRODUCTION OF MASTERSTEP I : PRODUCTION OF MASTER CASTCAST  Preliminary impressions are made in either Alginate, Agar or Elastomeric materials  Both Alginate and Agar should be poured immediately and proper base should be formed  Elastomeric impression can be beaded and boxed before pouring to get cast ready for surveying  Grind model, if necessary Personally my preference is to use medium viscosity elastomers for a cast partial impression
  4. 4. STEP II : SURVEYING & DESIGNING OF MASTERSTEP II : SURVEYING & DESIGNING OF MASTER CASTCAST Objective :  “To select the most suitable path of placement that satisfy the requirements of guiding planes, retention, non-interferences & esthetics”  Determine undercut areas with surveying instrument & tracing rod  Place the rod of the undercut disc against the clasp tooth  Mark the curve of the equator & clasp  Only the last third of the clasp should lie in the retention area
  5. 5. Contd…. ESTABLISHING MAPESTABLISHING MAP Primary objective is to establish a position of the cast that places teeth & associated tissues in the “Most-Advantageous-Position’’ (MAP) for treatment with the partial denture
  6. 6.  Eye-Survey : tilting the cast  Check parallelism of the guiding surfaces by Analyzing rod  Retention areas  Check for tissue undercuts  Eliminating spaces & voids  Tripoding
  7. 7.  Materials needed for this exercise are:  Sheet casting wax, a variety of profile waxes, pencil, Ash 5  Start by using a pencil, draw the outline of the framework on to the cast to ensure no components are omitted prior to spruing and casting. Failure to include every item may result in a new casting being made ESTABLISH OUTLINE & PREPARATIONESTABLISH OUTLINE & PREPARATION
  8. 8.  Addition of wax is intended to make the frameworks stand away from the master cast  Removable partial denture frameworks usually display intimate contact with the teeth & soft tissues, however there are certain areas where contact is not desirable  In these areas ,frameworks are shaped to stand away from underlying tissues  Addition of wax intended to make the frameworks stand away from the master cast is termed as relief A 2X2 mm stopper may be2X2 mm stopper may be placedplaced RELIEFRELIEF
  9. 9. MODELLING TIPMODELLING TIP The edges of wax steps should be formed using a sharp instrument at an angle of 90° so that the wax clasp profile receives a defined position
  10. 10. WAX FOR PATTERN FABRICATIONWAX FOR PATTERN FABRICATION Blocking-out wax  Bocking-out wax is easy to scrape and cut, and was developed for blocking out undercuts that have no clinical importance  Even during temperature-controlled soaking, the wax retains its shape and adheres firmly to the model  Blocking-out wax is hard and enables sharp contours to be reproduced on the duplicate model for clasp profiles  Blocking-out wax is easy to remove from the master model  Setting temperature approx. 68 °C, melting point 80-85 °C
  11. 11. DUPLICATINDUPLICATIN G THEG THE MASTERMASTER CAST BYCAST BY GEL/AGAR-GEL/AGAR- AGARAGAR
  12. 12. DESIGN TRANSFERDESIGN TRANSFER  Before waxing can begin ,the design has to be transferred from the master cast to the refractory cast  Do not apply pressure !!  Position of Individual clasps is most critical during transfer of design- they are positioned over appropriate ledges created during block out  Other areas are not so critical  It can be accurately  transferred with reasonable care
  13. 13. Stippling makes it easier to fixate food and weakens the extent to which the tongue senses foreign matter CASTING WAX RANGE SMOOTH CASTING WAX 0.25mm-0.80mm STIPPLED CASTING WAX 0.35mm-0.60mm COARSE,MEDIUM,FINE
  14. 14.  Waxes can be shaped in every thickness and profile, are easy to fixate, and adhere well to the model  The different profile shapes cover virtually every dental indication  Wax profile strips can be processed very well even at low temperatures, thus having a positive influence on contraction characteristics  The recipe makes the wax profile stable under pressure, and very little restoring force arises  An assortment of the most commonly used profiles is available in a practical box where they can be kept sorted WAX PROFILE STRIPSWAX PROFILE STRIPS
  15. 15. BEADING WAX CONTINUOUS CLASPS CASTING STRIPS
  16. 16.  Wax edge strips with retentions greatly reduce the modelling time for bases of partial maxillary dentures  The prefabricated shapes can be easily adapted to individual requirements WAX EDGE STRIPS WITH RETENTIONSWAX EDGE STRIPS WITH RETENTIONS
  17. 17. SPECIAL WAX BARSPECIAL WAX BAR PROFILESPROFILES  The half-teardrop  It is easy to finish & polish  The anatomical bar profile in the Prof. Dr. Marxkors design enables a very dimensionally stable construction, shape is standard for a sublingual bar  This profile has been well- proven over many years
  18. 18.  The bottom edge of this profile is rounded, like the functional edge of full dentures  The rounded side is inserted towards the mucous membrane, while the flat bar side faces the tongue  The anatomical wax bar profile enjoys very good acceptance among patients  It has a rounded top edge and a groove-like recess for the tongue
  19. 19.  Excellent restoration results can be achieved in both mandibular and maxillary modelling  Both partial and total dental prostheses can be modelled easily and efficiently WAX HOLE & LADDER RETENTIONSWAX HOLE & LADDER RETENTIONS WAX HOLE RETENTIONS WAX LADDER RETENTIONS WAX RETENTIONS WITH ROUND HOLES
  20. 20. WAX CLASPWAX CLASP PROFILESPROFILES Wax clasp profiles for molars & premolars are designed to ensure good hold & stability for dentures  All clasp profiles have an optimal anatomical shape & are made of easily adapted wax  Adhesion to the investment material model is optimal  Wax clasp profiles help save time during modelling,& highly customised adaptation of the wax shapes can be effected by shortening or lengthening them HALF PEAR DROP SECTIONSHALF PEAR DROP SECTIONS ARE EFFECTIVE &ARE EFFECTIVE & PREVENT FOOD RESIDUEPREVENT FOOD RESIDUE FROM GETTING STUCKFROM GETTING STUCK
  21. 21. WAX CLASPWAX CLASP PROFILESPROFILES  Wax clasp profiles for molars and premolars  Wax clasp profiles for ring clasps  Wax clasp profiles for Bony hard clasps  Wax clasp profiles for ring clasps, straight
  22. 22. WAX CLASP PROFILES FOR RINGWAX CLASP PROFILES FOR RING CLASPSCLASPS WAX CLASP PROFILES FORWAX CLASP PROFILES FOR GINGIVALLY APPROACHINGGINGIVALLY APPROACHING CLASPS WAX CLASP PROFILES FORWAX CLASP PROFILES FOR RING CLASPS, STRAIGHTRING CLASPS, STRAIGHT
  23. 23.  Slender shape with high stability is one of the requirements met superbly by these retentions  These retentions are characterised by two important aspects: the complexity of wax-up is reduced, thus saving time, and the partial denture prosthesis acquires optimal stability and wearing comfort  The grid retentions with holes can also be integrated very well as
  24. 24.  Wax wires on rolls are available as medium-hard wax in the various colour commonly green, with diameters ranging from 2.5 to 5 mm in 0.5 mm increments  When worked carefully, unwanted restoring forces during modelling will rarely occur; the recipe is designed for high internal stability while at the same time WAX WIRES FOR SPRUESWAX WIRES FOR SPRUES
  25. 25.  Wax wire on rolls is very economical in terms of consumption, because only the amount actually required needs to be cut
  26. 26. Once the wax pattern for framework is over the pattern is sprued either by: Overhead spruing Base spruing Spruing is followed by investing-casting

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