Border molding

Question 1

what is Border molding

Answer 1

Shaping of an impression material by functional or manual manipulation of the tissue to duplicate/record the contours, height, width, and depth of the vestibule

Question 2

what is the objective of border molding

Answer 2

determine contours
height
width of border of the complete denture

Question 3

why is border molding needed

Answer 3

To gain maximum bearing area of denture
correct clearence from frenum
correct clearange of muscle and membranous attachments
obtain peripheryl seal for max stability and retention of final denture

Question 4

what happens if border molding material extends onto the wax spacers

Answer 4

removal of wax prior to impression disrupts the border molding

Question 5

how long should patients remove dentures before impression appointment

Answer 5

remove denture 24 hours prior to appointment

Question 6

why should a patient remove dentures 24 hours prior to treatment

Answer 6

allows tissue recovery and keratinization of the edentulous muccosa

Question 7

why is PVS good to use

Answer 7

Easy to mix and dispense

Question 8

why does PVS make good impression

Answer 8

good dimensional stability and acuracy (week)

Question 9

what makes easier to remove

Answer 9

Excellend eleastic recovery

Question 10

what is the stiffest elastomeric impression material

Answer 10

Polyether Rubber

Question 11

what makes Polyether rubber good for impression

Answer 11

Optimal recording of the functional periphery sealr
Dimensional stability (week)
hydrophylic
excelent soft tissue detail

Question 12

why is polyether rubber bad

Answer 12

Bitter taste

Question 13

how much wax is removed from the inside of a tray to allow for border molding

Answer 13

2mm

Question 14

what shape of joint does border molding make with the tray

Answer 14

U shaped

Question 15

how much clearance between the tray and vestibule should there be

Answer 15

2mm

Question 16

what is the key to a succesful impression

Answer 16

Borders

Question 17

what is the prerequisite to successful impression making

Answer 17

knowing muscles and structures produce the border

- how to activate said muscles

Question 18

what are the border action for a maxillary impression

Answer 18

• ask patient to create suction around a finger and the impression tray handle
• ask patient to create suction around a finger and pucker lips to produce a maximal smile line
• ask patient to open mouth wide and move mandible side to side and stretch pterygomandibular raphe allowing the coronoid processes to shape the impression
• pinch nostrils closed and ask patient to blow air through nose while holding down the tongue/ have patient say aah or caugh

Question 19

what does creating suction/ puckering lips help to border mold

Answer 19

Labial and bucal frena

Labial and buccal vestibule

Question 20

what does moving the mandible side to side help create for border molding

Answer 20

the coronoid processes

Pterygomandibular raphe

Question 21

what should you do if moving mandible side to side creates differences in the right and the left of the border molding

Answer 21

repeat to check if this is acurate

Question 22

what happens if you don’t border mold for the coronoid process

Answer 22

causes pain and dislodging of denture

Question 23

what does blowing air out of the nose while it is pinched off show

Answer 23

Hard-soft palate junction

Question 24

what does saying ahh allow you to locate

Answer 24

Vibrating line

Question 25

what is the importance of doing both saying of AHh and air blowing

Answer 25

Identify the area between the vibrating line and the hard palate soft palate junction

Question 26

what are the key actions for mandibular border molding

Answer 26

• ask patient to create suction around a finer and impression tray handle
• pucker or pooch lips to create a maximal smile line
• pronounce the word christmas, letter Q and U and pull lower lip and cheek superioly over the impression tray
• place finger on the top of each side of the impression tray and ask the patient to close mandible against resistance using one second intervals of applied force
• ask patient to raise their tongue to the roof of the mouth, then anterior to vermilion border, then corners of mouth, and then swollow if possible

Question 27

how far back should a mandibular custom tray go

Answer 27

all the way back to the retromolar pads and beccal shelves

Question 28

what is done to the tray after border molding

Answer 28

Remove the wax spacer

Question 29

how is material to be loaded into a custom tray

Answer 29

2-3mm thickness
Loaded quickly to avoid viscosity increase
avoid bubbles
bring material over peripheries

Question 30

what happens if you record tissue in a dispaced location

Answer 30

the pressure limits normal blood flow, depriving tissue of normal blood supply
- resorption of bone occurs

Question 31

how should a completed maxillary impression look

Answer 31

smooth with well defined peripheries
adequate flange extensions
Soft tissue detail
maximum extension
even pressure distribution
intimate tissue contact

Question 32

how should acompleted mandibular impression look

Answer 32

Smooth, well defined periphery
Maximum extension
even pressure distribution
intimate tissue contact

Question 33

why do we use heavy body for border molding

Answer 33

Normal impression material would be too runny and wouldn’t allow for 4-5mm of border molding

Question 34

what is elastic recovery

Answer 34

how well a material bounces back after being deformed

Question 35

why does flexibility of impression material matte

Answer 35

helps with pulling out of the impression, when undercuts may be present