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