Lec 4.2: RPD Measurement Guidelines

Question 1

Major Connector:
- Should be ________ placed in relation to the median suture line or median palatine raphe.
- Width:
* Bar =
* Strap = (ant, lat, post)
* Plate =
- Clearance from FGM:
* Mx =
* Md =
- ____ should be present for maxillary cases.
- For APPC, the superior border should follow the ___________.
- For mandibular distal free-end cases, the major connector should only extend ________ to the last natural teeth and ________ towards the edentulous area.

Answer 1

• perpendicularly
• BAR = 4mm; STRAP = 8-10mm ant, 7-9mm lat, 4-7mm post; PLATE = 9-12mm
• mx = 6-8mm; md = 3-4mm
• beading
• valley of rugae
• a little distal; slanting

Question 2

Minor connector:
- Should be ______ attached to the major connector.
- Should be __________ as it approaches the ______.
- Should be located on the _______ or _________.
- Those located proximal to the edentulous area should be made ____________ (proximal plate).
- The base should be _________.
- There should at least be ____ of space between 2 minor connectors; in cases this space could not be achieved, the area should be covered with a _______.

Answer 2

• perpendicularly
• tapering = occlusal
• interdental spaces / embrasure spaces
• wider but thinner
• rounded
• 5mm space; plate

Question 3

Direct retainer:
- Presence of _________.
- Rest should be provided with ________.
- There should be at least ___ of thickness of metal in the junction between a rest and minor connector.
- Should be one _______ (tapering) and oppose by a ________ (equal width).
- Flexible 3rd of the retentive arm should be located _____ the survey line.
- Reciprocal arm should be placed ______ the survey line.

Answer 3

• rest seat preparation
• occlusal anatomy
• 1.5mm metal
• retentive arm; reciprocal arm
• below
• above

Question 4

Direct retainer:
- Clasp arm should engages more than _____ degrees of tooth circumference.
- Follow the __________ for strategic location of abutment to minimize stress control.
- For circumferential clasp: clasp arm should be placed at the _______________ and NEVER on the ______.
- I-bar approach arm should be ______ to the pre-gingival margin.

Answer 4

• > 180 degrees
• polygon of support
• junction of middle and gingival 1/3; never on the occlusal 3rd
• parallel

Question 5

For I-bar clasp:
- Superior border of the approach arm should be located ____ from the FMG.
- Minimum vestibular depth of _____ during function is required.
- Vertical portion of the approach arm should be located at least _____ from adjacent / other vertical components.

Answer 5

• 3-4mm
• 5mm
• 5mm

Question 6

Proximal plate:
- For distal free-end cases: should extend ____ just fat enough so that otgether with the mesial rest, it will provide adequate encirclement to prevent lingual movement of abutment tooth.
- Should be ____ in thickness.
- Contacts _______ of the proximal.
- Extension guidelines? (5)

Answer 6

• lingually
• 1-1.5mm
• 1mm guiding plane
• Extension guidelines:
  (1) Buccal cusp tip
  (2) Proximolingual line angle
  (3) Contact point
  (4) Incisal line angle
  (5) Anterior lingual contour

Question 7

DBRE:
- Maxillary distal free-end: DBRE should extend to the ________ to cover maxillary tuberosity.

• Maxillary cases: EFL should be located ______ below gingival margin.
• Mandibular cases: EFL should be located _____ below FGM.
• Strut should be located in between _______ and ____ horizontally.
• For tooth-bounded edentulous area: EFL should extend from?

Answer 7

• entire edentulous ridge
• 2-3mm
• 3mm
• artificial teeth; 2mm
• from one minor connector to the other minor connector