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Artificial Teeth Arrangement and Denture Base Waxup.

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Presentation on theme: "Artificial Teeth Arrangement and Denture Base Waxup."— Presentation transcript:

1 Artificial Teeth Arrangement and Denture Base Waxup

2 1. Procedures for Arranging Artificial Teeth and Waxing Up Denture Bases a. Tooth arrangement 1. If try-in is going to be accomplished, tinfoil is applied to cast over edentulous area as separator 2. Set the maxillary posterior teeth a. Flow wax around denture base retention to seal frame to cast b. Lower incisal guide pin 0.5 mm c. Set posterior teeth in maximum intercuspation 1. Marginal ridges set at same height 2. Maintain buccal alignment with adjacent teeth 3. Eccentric contacts must be avoided

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5 1. Procedures for Arranging Artificial Teeth and Waxing Up Denture Bases a. Tooth arrangement d. Return incisal guide pin flush with upper member e. Grind occlusal surfaces until pin touches the table to develop tight maximum intercuspation

6 1. Procedures for Arranging Artificial Teeth and Waxing Up Denture Bases b. Wax-up 1. Snowshoe principle a. Establish full coverage; cover ridge, mucco-buccal and lingual folds entirely b. Pressure is distributed over a broad surface area rather than concentrated on a point 2. Bulk wax - from finish lines to 1 mm past blue design line a. Overwax 2 mm onto the external finish line; allows finishing with no step between metal and acrylic b. Fill peripheral roll

7 b. Wax-up 3. Gingival trim - duplicate natural tissue a. 45 angle on the buccal side b. 90 angle on the lingual side 4. Festooning - eminences, when contoured should appear natural 5. Check occlusion to ensure no tooth movement has occurred during waxing

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9 Denture Bases Flasking and boiling out Processing Finishing

10 (1)Flasking and Boiling out RPD Bases (a)Flasking 1Lower half flasking aSeparate casts from mounting bDip casts in sepoarator cCover everything with stone EXCEPT wax and artificial teeth dDO NOT CREATE UNDERCUTS eBe careful not to cover wax or scratch it while cleaning the stone away

11 (1)Flasking and Boiling out RPD Bases fUse separator between the lower half and upper half of the flasks 2Upper half flasking aEnsure metal to metal contact of upper and lower halves bUncover occlusal surfaces of acrylic teeth cScoop out palate to aid in deflasking dUse separator

12 (1)Flasking and Boiling out RPD Bases 3Stone cap aOverfill slightly bEnsure metal to metal contact (b)Boil out 1One flask takes 4.5 minutes to heat up before separating 2Separate flask and remove all wax residue 3Watch for floaters

13 (2)Processing RPD Bases (a)Apply separator 1Paint a minimum of 2 coats on all stone surfaces 2DO NOT allow separator to pool in retention areas (b)Packing 1When working with acrylic, wear chemical resistant gloves 2Wash gloves thoroughly to prevent a line of demarcation caused by powder on gloves 3Mix acrylic resin IAW manufacturers directions

14 (2)Processing RPD Bases 4Split pack aPlace acrylic in both halves of flask 1The frameworks are retained in the lower half of the flask and the teeth in the upper 2This prevents the teeth and/or frameworks from being dislodged during trial packing bUse 2 plastic sheets between halves cTrial pack at least three times using plastic sheets between the halves for each trial pack dDo not allow acrylic to dry out during packing

15 (2)Processing RPD Bases 5Final pack - moisten both sides of acrylic with monomer to ensure there is no line of demarcation between the two halves (c)Cure F for 8 hours and 45 minutes 1Record flask numbers for identification purposes 2Ensure flasks are completely submersed in water

16 (3)Finishing RPD Bases (a)Deflask - recover casts with frameworks in place (b)Remount the casts on the articulator (c)Restore vertical dimension of occlusion 1Ensure incisal pin contacts the incisal guide table 2Be sure to maintain contacts in tight centric occlusion

17 (3)Finishing RPD Bases (d)Carefully remove RPDs from casts (dont break acrylic or bend out clasps) (e)Finish 1Trim flash using arbor bands or acrylic trimming stone 2Free acrylic from clasp using sandpaper discs 3Smooth transition between acrylic and external finish lines using rubber points and wheels 4Borders should be round with no sharp edges

18 (3)Finishing RPD Bases 5Use a fissure bur to grind bubbles from gingival trim (f)Polish 1Do not pumice festooning away - go back to finishing for hard to get areas 2Close attention should be given around clasps 3Repolish metal areas as necessary (g)Disinfect RPDs IAW manufacturer's directions


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