Download - Border-Molding in complete denture
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DR SHABEEL PNhttp://hi-dentfinishingschool.blogspot.com/
http://www.apexiondental.com/
BORDER MOLDING
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Shaping borders of impression tray
•Functional or manual manipulation of tissues
•Duplicates contour & size of vestibule
BORDER MOLDING
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Performed with Thermoplastic modeling compound
Waxes
Impression materials
BORDER MOLDING
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Remains in place during border molding procedures
TRAY WAX SPACER
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Comfortable 2-3 mm from vestibuleDry periphery of tray (Compound will not
stick to tray otherwise)
CUSTOM TRAY
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Use Bunsen Burner not Hanau Torch
Warm until it starts to droopDo not overheat – if catches fire
or boils, it will not mold properly
HEATING COMPOUND
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Apply over periphery of tray, in a thickness just slightly
narrower than the compound stick
COMPOUND APPLICATION
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Flame with a hand torch until all seams or sharp contours
have disappearedDo not melt wax spacer inside
tray
RE-SOFTEN AFTER APPLICATION
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Hold the tray upside down so that compound droops toward the depth of the vestibule
PREVENTING SLUMPING
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Temper in a water bath (135-140°F) for several seconds
Prevent burning
Hot water bath will keep compound soft for an extended period
TEMPERING COMPOUND
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Keep out of hot water bath to prevent melting
Difficult to replace tray intraorally in the same
positionResults in uneven border
molding
WAX SPACER
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Patient seated, head against headrest, mouth open & relaxed
If patient “opens wide”, commisures constrict, limiting access
PREPARE PATIENT
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Place intraorally by rotating into place
Mold by pulling on the cheeks, lips
Have patient make functional movements
INSERTING THE CUSTOM TRAY
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Chill in cold waterTrim excess over wax spacer or external material that is thicker
than 4-5 mm Clean debris from tray
AFTER REMOVAL
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Proper thicknessNo overlap
ASSESSING PERIPHERAL ROLE
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Difficult to see (opaque)Relieve tray
BURNTHROUGH
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If border is sharp or has seams, re-flame, temper and readapt
intraorallyRepeat until periphery is
completed
AFTER TRIMMING
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Don’t reduce border molding prior to final impression if:Modern low viscosity materials are used
Sufficient relief (spacer + holes)
BORDER MOLDING
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Seat tray firmly in mid-palatal area during border molding procedures
MAXILLA - SEATING THE TRAY
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Mold posterior buccal by pulling cheek down &
forward with slight circular movement
MAXILLA - CONTOURING
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Patient moves mandible side to side & opens wide
Molds the retrozygomal area
Allows for movement of coronoid process
Prevents impingement of pterygomandibular raphe
FUNCTIONAL MOVEMENTS
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Pull lip outward & downwardDo not pull to one side
MAXILLA - LABIAL FRENUM
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Labial frenum should be narrow
Buccal frenum usually broader, “V-shaped”
MAXILLA - LABIAL FRENUM
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Add compound across the top of the tray (not at the edge)
MAXILLA - POSTERIOR
BORDER
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Terminates at vibrating line and hamular notches
Mark with an indelible stickInsert tray & check visually
MAXILLA - POSTERIOR BORDER
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Relatively symmetrical
EVALUATING BORDER MOLDING
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Retentive
EVALUATING MAXILLARY BORDER MOLDING
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More difficultChanging position of the floor of the mouth
MANDIBLE
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Pull cheek upward while holding tray in placeHave patient suck cheeks inward while holding tray
in place
POSTERIOR BUCCAL AREAS
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Should be covered (at least partially) to provide a seal and comfort to the patient
RETROMOLAR PAD
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Don’t extend past EORPalpate cheek at angle of the
mandible Smooth transition between mandible &
border - not palpable
EXTERNAL OBLIQUE RIDGE
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Look for fold in vestibule
BUCCAL EXTENSION
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Distal buccal extension Patient closes against force
Activates the masseter, which will displace the compound
MASSETER MUSCLE
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Labial frenum is narrowpull lip straight up,
not as exaggerated as maxillaBuccal frena broad & “V-shaped”
MANDIBULAR FRENAL ATTACHMENTS
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Have patient touch their tongue to the corners of the mouth, to the palate and stick their tongue out of their mouth
POSTERIOR LINGUAL AREAS
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An “S” shaped lingual flange commonly results in posterior lingual area
POSTERIOR LINGUAL AREAS
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Distolingual border can extendStraight down from the retromolar pads
Anteriorly to varying degrees
Almost never angles posteriorly from retromolar pads
RETROMYLOHYOID SPACE
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Lower border at or slightly below mylohyoid ridge but not deeply
into the undercut below the ridge,
Minimizes, abrasion and discomfort
POSTERIOR LINGUAL AREAS
BuccalBuccal
AttachmentsAttachmentsTo HyoidTo Hyoid
MylohyoidMylohyoidRidgeRidge
X-section throughX-section throughMandibular ridgeMandibular ridgein 2nd Molar regionin 2nd Molar region
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Denture should not lift with normal tongue movements
POSTERIOR LINGUAL AREAS
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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
ANTERIOR LINGUAL