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