Border Flashcards
complete denture impression
negative registration of the entire denture bearing, stabilizing and border seal areas present in the edentulous mouth
preliminary impression
made for the purpose of diagnosis or for the construction of a tray
primrary impression making uses
alginate
impression philosophies (3)
minimal pressure
functional pressure
selective pressure
minimal pressure impression
attempt is made to exert as little pressure as possible during impression procedures
objective is to capture tissues in their most undisturbed and undisplaced firm
minimal pressure rationale
suggests that if tissues are recorded in an indisturbed state using an accurate, free flowing impression material, retention and stability of the dentures would be increased
minimal pressure material
low viscosity, high flow
minimal pressure used to seat and hold tray
functional pressure impression
made with soft tissue under a significant load
impression material is more viscous
functional pressure theory
denture base tissue contact during function would be more intimate if tissue is recorded under compression
selective pressure impression
pressure in certain areas, minimal pressure on other areas
dentist decides where and how much pressure
which technique do we use?
selective pressure
how do we select areas of pressure and non pressure within the same impression? (4)
wax spacer relief
drill vent holes in tray
grind the tray for relief space
combination of the above
why use a custom. tray?
borders can be modified to control the movable soft tissues around the impression and avoid distorting them
space can be provided inside the tray so that the shape of the tissues supporting the denture may be recorded with minimal or selective — in the primary support areas
displacement
for secondary impressions, mucosa should be
healthy
secondary impression material
low viscosity
in secondary impressions, use minimum
pressure to seat tray; seat and hold impression until set
purpose of border molding
define denture in length, width, shape, countour
when completed it should resemble
anticipated denture border
border molding materials
thermoplastic materials, elastomeric impression materials
kerr green stick modeling comound working temp
123 F
water bath temp
135-140 F
maxillary border molding (2)
insert tray and insure that 2 mm of space is present between
vestibular reflection and tray border
Tray must extend into each hamular notch and to just beyond/posterior to the vibrating line (“ah” line on soft palate)
max border molding steps
warm compound and place on a section of perimeter of dry tray
temper in water bath
place in mouth
max posterior patient moves jaw from
side to side (determines length)
Buccal frenum area (3)
Warm compound, temper, insert tray
Elevate cheek, lightly massage outward, downward and ant. -posteriorly
Chill compound and inspect
Labial Vestibule
elevate lip outward, massage downward
Labial frenum (3)
Warm, temper compound
Elevate lip, seat tray
Lightly massage lip straight down –do not move lip side-to-side
Posterior palatal border
Have patient pinch nostrils, blow lightly through nose, then swallow
Mandibular (2)
Try in tray - - 2 mm space at border
►Difficult to see on lingual
Lingual frenum area:
Gently wet upper lip with tip of tongue – of border
Place tip of tongue under upper lip side to side – of border
length
width
Alveololingual sulcus
patient swallows or protrudes tongue- but not past the lips
Mylohyoid region (2)
Patient swallows forcefully 2 or 3 times-floor of the mouth moves
Tongue touches buccal vestibules (R & L) and thumb by the handle
Distal border and Masseteric notch (2)
Patient stretches wide open
Patient closes against manual pressure
Buccal frenum
Massage cheek outward, upward, inward/ Anterior-posterior
A mental picture: when completed, should resemble
what denture border will look like
