Major and Minor Connectors

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Maxillary and mandibular major connector need to place away from gingival margin at least:
- Maxillary: 6 mm
- Mandibular:
- 4 mm
What limit the inferior border of a lingual mandibular major connector?

The floor of the mouth
There are 2 methods for determining the height of the floor of the mouth:
- Measure with a probe while letting patient licks their upper lip
- Individual impression
How thick the lingual bar should be?

6-gauge half-pear-shaped wax
Where is the upper boarder of lingual plate?

The upper border should not be placed above the middle third of the lingual surface.
Lingual plate and cingulum bar can act as indirect retainer. T/F?

F! If the indirect retainer is needed, definite rest must be provided.
4 indications for lingual plate:
- 1. Height of the floor of mouth is less than 8 mm. (lingual bar + space = 4+4)
- 2. Kennedy Cl I with excessive vertical resorption (bracing effect resists rotation)
- 3. For stabilizing periodontal teeth
- 4. Future replacement of questionable incisors
Where sublingual bar is placed comparing to lingual bar?

more inferior and posterior
In limited height of the floor of the mouth (<8mm), sublingual bar can be used in lieu of lingual plate when:

when anterior lingual undercut presents
Contraindication for the use of sublingual bar:
- interfering lingual tori
- high lingual frenum
- elevation of the floor of the mouth while functioning
Which situation a cingulum bar (continuous bar) should be used instead of a lingual pplate?
when excessive blockout of interproximal undercut must be made
- Remember: cingulum bar locate slightly above cingulum
- Remember2: cingulum bar can be used alone or in conjunction with lingual bar
What are indications for labial bar? (2)
Why labial bar is rarely used?
- The indications of labial bar are:
- extreme lingual inclination on incisors and premolars
- inoperable tori
Because most inclined teeth can be reshaped (or crown), and tori can be removed.
Swing-Lock design consists of (2) which function as:
- 1. Labial bar: retention from retentive bar
- 2. lingual plate: stabilization and receprocation
Indications for Swing-Locks design: (4)
- Missing key abutment such as canines*
- Teeth with questionable prognosis*
- unfavourable tooth contour
- unfavourable soft tissue contour
(*) Absent of key abutment or questionable pronosis tooth is not a big deal when SL design already use all teeth as abutments.
Contraindication for Swing-Lock design:
- poor oral hygiene
- high frenum
The advantage of a single palatal strap is:

less bulk (22 guage)

Remember: A single palatal strap is used in posterior teeth replacement only.
Anterior and posterior palatal strap placement:
- Anterior part: posterior to rugae
- Posterio part (at least 8 mm): anterior to junction of hard and soft palate
Remember: anterior part can be extended anteriorly to support anterior teeth replacement
Contratindication for anterio-posterior palatal strap:
- Large tori that extends from hard to soft palate.
- U-shaed major connector can be used in this case.
What are the purpose of beading of the maxillary cast?
- to transfer major connector design to the investment cast
- provide visible finishing line
- ensure intimate tissue contact
Remember: groove is no larger than 0.5 m
What are 2 purposes of tissue stop?
- provide stability during the stages of transfer and processing
- preventing distortion of framework
What is used to augment under tissue stop during packing?

Autopolymerising resin

Remember: minor connertor is elevated after functional impression
The finishing line takes the form of angle no greater than:

90 degrees

Author

Sompol

338316

Card Set

Major and Minor Connectors

Description

McCracken’s RPP

Updated

2018-02-21T17:33:33Z