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Descripción: Mostafa Fayad Table of contents Subjects 1 OBJECTIVES AND CLASSIFICATION 2 BIOMICHANICS OF RPD 3 PARTIAL DENTURE DESIGN 4 DENTAL SURVEYOR 5 Denture base 6 RESTS AND REST SEATS 7 CONNECTO...
BORDER MOLDING
DR SHABEEL PN http://hi-dentfinishingschool.blogspot.com/ http://www.apexiondental.com/
BORDER MOLDING
Shapingg borders of impress Shapin impression ion tray Functional or manual manual manipulation of of tissues Duplicates contour contour & size of vestibule
BORDER MOLDING
Performed with Thermoplastic modeling compound Waxes Impression materials
TRAY
WAX SPACER
Remains in place during border molding procedures
CUS TOM TRAY
Comfortable
2-3 mm from vestibule Dry periphe periphery ry of tra tray y ( Compound will not stick to tray otherwise)
HEA TING
Use
COMPOUND
Bunsen Burner not Hanau Torch
Warm until it starts to droop Do not not ove overhea rheatt ² if catc catches hes fire fire or or boils, it will not mold properly
COMPOUND APPLICA TION
Apply over over periphery peripher y of tray tray,, in a thickness just slightly narrower than the compound stick
RE-SOF TEN AF TER APPLICA TION
Flame with a hand torch until all seams or sharp contours have disappeared Do not melt wax spacer inside tray
PREVEN TING SLUMPING
Hold the tray upside down so that compound droops toward the depth of the vestibule vestibule
TEMPERING
COMPOUND
°
Temper T emper in a water bath (135-140 ( 135-140 F) for several seconds Prevent burning Hot water bath will keep compound soft for an extended period
WAX SPACER
eep K eep
outt of hot wate ou waterr bath to prevent melting
Difficult to replace tray intraorally in the same position Results Re sults in uneven border molding mol ding
PREPARE PA TIEN T
Patient seated, head against headrest, mouth open & relaxed If patient ´opens ´opens wideµ, commisures commisures constrict, limiting access
INSER TING THE CUS TOM TRAY
Place intraorally by rotating into place Mold by pulling on the cheeks, lips Have patient make functional movements
AF TER REMOVAL
Chill
in cold water
Trim excess over wax spacer or external material that is thicker than 4-5 mm Clean
debris from tray
ASSESSING PERIP HERAL ROLE
Proper thickness No overlap
BURN THROUGH
Difficult to see (opaque) Relieve tray
AF TER TRIMMING
If border is sharp or has seams, seams, re-flame, re-flame, temper and readapt intraorally Repeat until periphery is completed
BORDER MOLDING
Don·t reduce border molding prior to final impression if: Modern low viscosity materials viscosity materials are used Sufficient relief (spacer + holes)
- SE SEAT ATIN ING G TH THE E TRA TRAY Y
MAXILLA
Seat tray firmly in mid-palatal area during border molding procedures
- CONTO TOU URING
MAXILLA
Mold posterior buccal by pulling cheek down & forward with slight circular movement
FUNC TIONAL MOVEMEN TS
Patient moves mandible side to side & opens wide Molds the retrozygomal area Allows for movement movement of coronoid process Prevents impingement of pterygomandibular raphe
- LA LABI BIA AL FR FREN ENUM UM
MAXILLA
Pull lip outward & downward Do not pull to one side
- LA LABI BIAL AL FRE REN NUM
MAXILLA
Labial frenum should be narrow Buccal frenum usually us ually broader, ´V ´V-shapedµ
-
MAXILLA
POSTERIOR BORDER Add compound compound across across the top of the tray (not at the edge)
- PO POST STER ERIO IOR R BO BORD RDER ER
MAXILLA
Terminates at vibrating line and hamular notches Mark with an indelible stick Insert tray & check visually
EVALUA TING BORDER MOLDING
Relatively symmetrical
EVALUA TING MAXILLAR MAXILLARY Y BORDER MOLDING Retentive
MANDIBLE
More difficult Changing
position of the floor of the mouth
POS TERIOR BUCCAL AREAS
Pull cheek upward while holding tray in place Have patient suck cheeks inward while holding tray in place
RE TROMOLAR PAD
Should be covered (at least partially) to provide a seal and comfort to the patient
EX TERNAL OBLIQUE RIDGE
Don·t extend past EOR Palpate Pal pate cheek at angle angle of the mandible mandible Smooth transition between between mandible & border - not palpable
BUCCAL EX TENSION
Look for fold in vestibule
MASSE TER MUSCLE
Distal buccal extension Patient closes against force Activates the masseter, which will displace the compound
MANDIBULAR FRENAL A TT ACHMEN TS
Labial frenum is narrow pull lip straight up, not as exaggerated as maxilla
Buccal frena broad & ´V-shapedµ
POS TERIOR LINGUAL AREAS
Havee patient touch their Hav their tongue to the corners of the mouth, to the palate and stick stick their tongue out of their mouth
POS TERIOR LINGUAL AREAS
An ´Sµ shaped lingual flange commonly results in posterior lingual area
RE TROMYLOH YOID SPACE
Distolingual border can extend Straight down from the retromolar pads Anteriorly to varying degrees Almost never angles posteriorly from retromolar pads
POS TERIOR LINGUAL AREAS
Lower border at or slightly below mylohyoid myloh yoid ridge but not deeply into the undercut below the ridge, Minimizes,, abrasion Minimizes a brasion and discomfort
X--section X -section through Mandibular ridge in 2nd Molar region
Buccal Mylohyoid Ridge Attachments To Hyoid Hy oid
POS TERIOR LINGUAL AREAS
Denture should not lift with normal tongue movements
AN TERIOR LINGU LIN GUAL AL
Patient lifts tongue to palate, to corners of mouth and sticks tongue out Hold tray tray in place place ² denture should should not lift lift with normal tongue movement
