Final Impressions, Jaw Relationship Records, and Articulation for Removable Prosthodontics

How do you identify the mylohyoid ridge on the cast?

turn the cast to throw a shadow on the lingual of the alveolar ride

How far away from the crest of the ridge are the frenulum located?

3-5mm

How much of the mentalis muscle can you safely cover?

1/3

What are the oblong bumps on either side of the labial frenum?

the mentalis muscle attachments

What does the mentalis muscle do to the denture?

Lift the denture

What is the ridge on the buccal side of the alveolar ridge?

External Oblique Ridge

What is the tissue in the anterior half of the retromolar pad and what function does it serve?

• Fibrous CT

• Provides stability and support for the distal end of the denture

What provides support for the floor of the mouth and is active in most physiologic movements of the mouth

mylohyoid muscle

What is the objective when pouring a cast?

capture all surface detail of the impression in as bubble-free of a manner as possible

How thick should master casts be in order to provide strength during articulation, set up, flasking, processing?

15 mm

Indexs are used to…

properly reposition the casts on the articulator after processing

What is a baseplate/record base?

an interim denture base used to support the record rim material for recording maxillomandibular records

Baseplates should do what 3 things?

1. fit master cast as accurately as possible

2. cover all areas which will be covered by completed denture

3. not rock on the cast

What are two categories of baseplates?

• Basic

• Stabalized

What is a basic baseplate?

it tightly adapts to the peripheral borders of the cast

What is a stabilized baseplate?

baseplate lined with an impression material to improve stability and adaptation

What are the 3 materials baseplates can be made from?

1. Wax

2. Resin

3. Auto-polymerizing resin

Why is wax the least desirable?

body temp. can distort the wax

Resin can be (two)?

1. light cured

2. vacuum formed

Why is auto-polymerizing resin preferred for baseplates?

Strength and stability

What is an occlusion rim?

artificial occluding surface built on temporary denture base for the purpose of making relationship records

what are the occlusion dimensions for maxillary?

• Anterior: 22mm

• Posterior: 18mm

What are the occlusion dimensions for the mandibular?

• Anterior: 18mm, 2/3 up the retromolar pads

What are the occlusion dimensions for the labio-lingual height?

8-10mm

What are the 6 reasons occlusion rims are used for?

1. Establishing vertical dimension

2. Establishing and maintaining occlusal plane

3. Establishing and maintaining the relationship of the man. to the max.

4. Restoring facial contours, specifically lip forms

5. Recording mid-line, high lip line (smile line), and the corners of the mouth

6. Hold artificial teeth

What is an articulator?

an instrument which stimulates or approximates the movements of the temporomandibular joints to which casts may be mounted

What is a face bow?

an instrument that records the relationship of the maxilla to the hinge axis of rotation of the mandible

What are central bearing devices?

• Intra/Extra oral

• produce an arrow point tracing which is a graphic representation of centric relation

What is a gothic arch tracing device?

an intra oral device which scribes man. movement and forms a series of apices, the center of which indicates the most posterior, unstrained relation of the mandible to the maxilla, CENTRIC RELATION

What is a pantograph?

an extra oral device which when attached to occlusion rims records mandibular boundary movements

what is mounting?

laboratory task of attaching casts to an articulator

What are 2 non-adjustable articulators?

• Hinge (straight line)

• fixed guide

What is a hinge articulator used for?

hold or maintain the vertical and horizontal relationships between two casts at one man. position

What is a fixed guide articulator used for?

produce the lateral and protrusive movements characteristics of a statically average patient

What is a semi-adjustable articulator?

adjustable horizontal and lateral condylar guides, minor bennet adjustments and occlusal table

What is a fully adjustable articulator?

allows for accurate replication of jaw relationships and lateral and protrusive movements

What is an ARCON Articulator?

articulator that has the condyle elements attached to the lower member in the same way condyles are an anatomic feature of the man. in a human skull

What is balancing occlusion?

contact of teeth in centric and eccentric positions which provides a harmonious, simultaneous contacting of anterior and posterior teeth in each arch

What is centric relation?

the most posterior relation of the mandible to the maxilla at an established vertical dimension

• only movement an edentulous patient can repeat

What is centric occlusion?

relationship of opposing occlusal surfaces which provides maximum planned contact between teeth

• way artificial teeth, crowns, etc. are positioned

What is lateral movement?

mandible moving right or left of the midline

what is interocclusal distance?

distance between occluding surfaces of maxillary and mandibular teeth in a rest position

• also called free-way space

what is vertical dimension?

vertical measurement of the face or dental arches, measured at the midline

what are the two types of vertical dimension?

• occlusal VDO

• rest VDR

What is balancing side?

side of the dental arch opposite the direction of man. movement

What is the curve of spee?

curvature of the man. occlusal plane beginning at the tip of the lower cuspid and following the buccal cusps of the post. teeth continuing to the terminal molar

What is the curve of wilson?

lateral curve of the occlusal table formed by the lingual inclination of the posterior teeth

What is canine guided articulation?

form of mutually protected articulation in which the canines disengage the posterior teeth during an excursive man. movement

• also called cuspid guidance

• not desired set up for complete dentures