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Border Molding Shaping borders of impression tray Functional or manual manipulation of tissues Duplicates contour & size of vestibule Shaping borders of.

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Presentation on theme: "Border Molding Shaping borders of impression tray Functional or manual manipulation of tissues Duplicates contour & size of vestibule Shaping borders of."— Presentation transcript:

1 Border Molding Shaping borders of impression tray Functional or manual manipulation of tissues Duplicates contour & size of vestibule Shaping borders of impression tray Functional or manual manipulation of tissues Duplicates contour & size of vestibule

2 Border Molding Performed with –Thermoplastic modeling compound – Waxes –Impression materials Performed with –Thermoplastic modeling compound – Waxes –Impression materials

3 Tray Wax Spacer Remains in place during border molding procedures

4 Custom Tray Comfortable 2-3 mm from vestibule Dry periphery of tray (Compound will not stick to tray otherwise) Comfortable 2-3 mm from vestibule Dry periphery of tray (Compound will not stick to tray otherwise)

5 Heating Compound Use Bunsen Burner not Hanau Torch Warm until it starts to droop Do not overheat – if catches fire or boils, it will not mold properly Use Bunsen Burner not Hanau Torch Warm until it starts to droop Do not overheat – if catches fire or boils, it will not mold properly

6 Compound Application Apply over periphery of tray, in a thickness just slightly narrower than the compound stick

7 Re-soften After Application Flame with a hand torch until all seams or sharp contours have disappeared Do not melt wax spacer inside tray Flame with a hand torch until all seams or sharp contours have disappeared Do not melt wax spacer inside tray

8 Preventing Slumping Hold the tray upside down so that compound droops toward the depth of the vestibule

9 Tempering Compound Temper in a water bath ( °F) for several seconds –Prevent burning – Hot water bath will keep compound soft for an extended period Temper in a water bath ( °F) for several seconds –Prevent burning – Hot water bath will keep compound soft for an extended period

10 Wax Spacer Keep out of hot water bath to prevent melting –Difficult to replace tray intraorally in the same position –Results in uneven border molding Keep out of hot water bath to prevent melting –Difficult to replace tray intraorally in the same position –Results in uneven border molding

11 Prepare Patient Patient seated, head against headrest, mouth open & relaxed If patient “opens wide”, commisures constrict, limiting access Patient seated, head against headrest, mouth open & relaxed If patient “opens wide”, commisures constrict, limiting access

12 Inserting the Custom Tray Place intraorally by rotating into place –Mold by pulling on the cheeks, lips –Have patient make functional movements Place intraorally by rotating into place –Mold by pulling on the cheeks, lips –Have patient make functional movements

13 After Removal Chill in cold water Trim excess over wax spacer or external material that is thicker than 4-5 mm –Clean debris from tray Chill in cold water Trim excess over wax spacer or external material that is thicker than 4-5 mm –Clean debris from tray

14 Assessing Peripheral Role Proper thickness No overlap Proper thickness No overlap

15 Burnthrough Difficult to see (opaque) Relieve tray Difficult to see (opaque) Relieve tray

16 After Trimming If border is sharp or has seams, re-flame, temper and readapt intraorally Repeat until periphery is completed If border is sharp or has seams, re-flame, temper and readapt intraorally Repeat until periphery is completed

17 Border Molding Don’t reduce border molding prior to final impression if: –Modern low viscosity materials are used –Sufficient relief (spacer + holes) Don’t reduce border molding prior to final impression if: –Modern low viscosity materials are used –Sufficient relief (spacer + holes)

18 Maxilla - Seating the Tray Seat tray firmly in mid-palatal area during border molding procedures

19 Maxilla - Contouring Mold posterior buccal by pulling cheek down & forward with slight circular movement

20 Functional Movements Patient moves mandible side to side & opens wide –Molds the retrozygomal area –Allows for movement of coronoid process –Prevents impingement of pterygomandibular raphe Patient moves mandible side to side & opens wide –Molds the retrozygomal area –Allows for movement of coronoid process –Prevents impingement of pterygomandibular raphe

21 Maxilla - Labial Frenum Pull lip outward & downward –Do not pull to one side Pull lip outward & downward –Do not pull to one side

22 Maxilla - Labial Frenum Labial frenum should be narrow Buccal frena usually broader, “V-shaped” Labial frenum should be narrow Buccal frena usually broader, “V-shaped”

23 Maxilla - Posterior Border Add compound across the top of the tray (not at the edge)

24 Maxilla - Posterior Border Terminates at vibrating line and hamular notches Mark with an indelible stick –Insert tray & check visually Terminates at vibrating line and hamular notches Mark with an indelible stick –Insert tray & check visually

25 Evaluating Border Molding Relatively symmetrical

26 Evaluating Maxillary Border Molding Retentive

27 Mandible More difficult Changing position of the floor of the mouth More difficult Changing position of the floor of the mouth

28 Posterior Buccal Areas Pull cheek upward while holding tray in place Have patient suck cheeks inward while holding tray in place Pull cheek upward while holding tray in place Have patient suck cheeks inward while holding tray in place

29 Retromolar Pad Should be covered (at least partially) to provide a seal and comfort to the patient

30 External Oblique Ridge Don’t extend past EOR Palpate cheek at angle of the mandible –Smooth transition between mandible & border - not palpable Don’t extend past EOR Palpate cheek at angle of the mandible –Smooth transition between mandible & border - not palpable

31 Buccal Extension Look for fold in vestibule

32 Masseter Muscle Distal buccal extension Patient closes against force Activates the masseter, which will displace the compound Distal buccal extension Patient closes against force Activates the masseter, which will displace the compound

33 Mandibular Frenal Attachments Labial frenum is narrow –pull lip straight up, –not as exaggerated as maxilla Buccal frena broad & “V-shaped” Labial frenum is narrow –pull lip straight up, –not as exaggerated as maxilla Buccal frena broad & “V-shaped”

34 Posterior Lingual Areas Have patient touch their tongue to the corners of the mouth, to the palate and stick their tongue out of their mouth

35 Posterior Lingual Areas An “S” shaped lingual flange commonly results in posterior lingual area

36 Retromylohyoid Space Distolingual border can extend –Straight down from the retromolar pads –Anteriorly to varying degrees –Almost never angles posteriorly from retromolar pads Distolingual border can extend –Straight down from the retromolar pads –Anteriorly to varying degrees –Almost never angles posteriorly from retromolar pads

37 Posterior Lingual Areas Lower border at or slightly below mylohyoid ridge but not deeply into the undercut below the ridge, Minimizes, abrasion and discomfort Lower border at or slightly below mylohyoid ridge but not deeply into the undercut below the ridge, Minimizes, abrasion and discomfort Buccal Attachments To Hyoid MylohyoidRidge X-section through Mandibular ridge in 2nd Molar region

38 Posterior Lingual Areas Denture should not lift with normal tongue movements

39 Anterior Lingual Patient lifts tongue to palate, to corners of mouth and sticks tongue out Hold tray in place – denture should not lift with normal tongue movement Patient lifts tongue to palate, to corners of mouth and sticks tongue out Hold tray in place – denture should not lift with normal tongue movement


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