Mandibular major and minor connectors of RPDs

Preclinical course of Removable Partial Denture:
1- Introduction and Definitions
2- Forces acting on RPD.
3- Biomechanical considerations
4- Denture bases
5- Rests
6- Major and Minor connectors
7- Retainers
8- Indirect retainers
9- Stress equalizing Designs

1. 6-Major Connectors
b. Mandibular Major Connectors

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a kind word,
a listening ear,
an honest compliment,
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3. CONNECTORS
A-Major connectors
B-Minor connectors
Maxillary Major Connector
Mandibular Major Connector

4. Definition
It is that unit of the
partial denture to which
all other parts are
directly or indirectly
attached.
This component Provides
Cross-arch Stabilization.

5. 1.Jointhe component parts of RPD together.
2.They may contribute to the functions of
bracingand reciprocation.
Functions of mandibular
connectors

6. Structural Requirements for
Mandibular Major Connectors
1-Rigid and should provide
cross arch stabilization
and broad load
distribution.
2-Relievedto avoid settling
into the mucosa
3-A half-pear shape in cross
section.

7. Structural Requirements for Mandibular Major Connectors
4-The superior border of the lingual
barshould be placed 3-5 mm
5-The borders should run parallel to
the gingival margin
6-The inferior border should be
gently rounded above the moving
tissues of the floor of the mouth.
7-Impingement of gingival tissues
should be avoided.

8. Structural Requirements for Mandibular Major Connectors
The gingival margin should be relieved.
8-The lingual
plateshould
be extends to
the cingulae of
the anterior
teeth

9. 9.Not Interfere or irritate the tongue.
10.Not alter the natural contourof the
lingual surfaces of the arch.
11.Not impingeon the oral tissues (tori),
when the restoration is placed, removed
or rotated during function.

10. 12.Cover no more tissues than necessary.
13.Not allow trapping of food.
14.Be made from an alloy compatible with oral
tissues.

11. TYPES OF MANDIBULAR MAJOR
CONNECTORS
Lingual bar.
Sublingual bar.
Double lingual bar.
(Kennedy bar)
Cingulum bar.
Labial bar.
PLATEBARS
Lingual plate

12. 3-5mm
3-4 mm
3-5mm
Location and Form
LINGUAL BAR

13. Lingual bar
4mm
gingival margin
Class ?????????
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14. Half-pear shape in cross section, tapered superiorly with
the broader and thicker portion at the inferior border.
LINGUAL BAR

15. LINGUAL BAR
The inferior border should be gently rounded
above the moving tissues of the floor of the
mouth; to avoid irritation or injuring the
subadjacent tissues when the restoration moves

16. LINGUAL BAR
The bar should be
relieved sufficientlybut
not excessively over the
underlying tissues.
Lingual tori are
generously relieved
when surgery is
contraindicated.

17. Function:
The lingual bar functions only as a major
connector. It does not provide neither support
nor indirect retention.

18. F
It does not provide neither support nor
indirect retention.
?????????Why

19. Disadvantages
* May attain some flexibility, specially if
they are poorly constructed or designed.
Contraindications:
-Inadequate space
-Extreme lingual inclination of lower
anterior teeth.
-High lingual frenularattachment.
-Bilateral torus mandibularis
-Undercut on the lingual side of the ridge

20. MEASUREMENT OF LINGUAL SULCUS.

21. SUBLINGUAL BAR
Location and form:
•Extending over and parallel to the anterior floor of the
mouth.
•It has a tear drop configurationwhose base is towards
the base of the tongue.
•It is relieved( 26-30 gauge) from the floor of the mouth.

22. SUBLINGUAL BAR
•Insufficient depthof
alveololingualsulcus.
•Reduced height of the
alveolar ridge,
Contraindication
•Highly attached lingual
frenum.
Indications:

23. SUBLINGUAL BAR
•Well tolerated
•It permits exposureof the
gingival tissue
•Allows for proper cleaning.
•The under side of the tongue is
sparsely provided with tactile
receptors.
Advantages:
1-Requires functional impression.
2-Difficult in lab construction .
Disadvantages:

24. THE DOUBLE LINGUAL BAR
KENNEDY BAR
•A lingual bar and a cingulum
bar (Kennedy bar).
•Secondary lingual bar.
•Usedto add to the strength
and rigidity of the denture
•Kennedy baris neither a
major connector nor indirect
retainer by itself

25. KENNEDY BAR
Two supporting rests must be placed one on each end of
the Kennedy bar. These restsprevent settling of the bar during
function, thus preventing laceration of the gingiva and act as
indirect Retainers

26. •Allows natural stimulation
•stabilization
•Rigidity
•Proper distribution of the stresses
•Splintingof teeth.
•No gingival coverage..
•I.R. through its terminal rests.
Advantages of KENNEDY BAR
Disadvantages:
•Objectionable to the tongue
•Collect food
•Phonetic problems.
Contraindications: short clinical crowns or inclined
linguallyand Not used with space anteriors

27. CINGULUM BAR
•Indicated where there is insufficient roomfor
the lingual bar
•The teeth should have good mesiodistal contact
with sufficient crown length.
•Marked lingual inclinationof the anterior teeth
prevents the use of cingulum bar

28. LINGUAL PLATE
Most rigidmand. M. c.
Better bracing
Cross-arch stabilization
Splinting for weak teeth.

29. 1-The superior border should be
LINGUAL PLATE
a-Scalloped and projected to the
contact points between the
projections the border should not
exceed the middle third of the teeth.
b-Positively contacting the teeth.
c-As thin as possible.
2-It is relieved at the gingival margin.
3-It is provided with slots in case of diastema.
4-Lingual area should be surveyed to block out
undercuts.

30. Indications:
1-High floor of the mouth and high frenalattachment.
2-When future teeth replacement is anticipated.
3-Splinting of periodontallyaffected teeth.
Advantages:
1-The most rigid lower connector.
2-Can act as indirect retainer XX????.
3-Provides splinting if used in conjunction with labial bar.
Disadvantages:
1-Covers gingiva and teeth; so no gingival stimulation.
(Patient is instructed to massage the gingiva).
2-May contribute to caries and periodontal disease.
LINGUAL PLATE

32. LABIAL BAR
•Thick and bulkthan a lingual barto
counteract the increased flexibility due to
increased length.
•Half-pear shapedwith bulkiest potion
located inferiorly.
•Runs across the labial and buccal mucosa .
•Superior border taperedto soft tissue
located at least 4 mmbelow the gingival
margin.
Form and Location:
•Must be relievedover the canine eminence .

33. LABIAL BAR
When large lingual toriexist and surgery is
precluded.
i.e. obviates the need for surgical intervention
Indications:
With extreme lingual
inclinationof mandibular
anterior teeth

34. Prominent inoperable tori.
(Bone growth)

35. Made thick because
of lacks of sufficient
rigidity.
Labial vestibular depth
must be adequate
especially in the presence
of gingival recession
LABIAL BAR
Disadvantages:

36. It provides splinting.
Contraindications:Poor oral hygiene.
The presence of shallow buccal or labial
vestibule. The presence of high frenal attachment
LABIAL BAR

37. The Swing Lock Partial Denture
LABIAL BAR

38. Connected by a hinge device at one end and a
locking device at the other end.Vertical minor
connectorsarise from the labial bar, touch the anterior
teeth below the survey line
LABIAL BAR

39. Mandibular major connectors
Lingual
Plate
Lingual bar
Sublingual
Bar
Dental bar
Kennedy bar

40. Continuous bar Sublingual bar
Linguoplate Labial bar
?
?
?
?

41. Split Lingual Major Connector
A flexible
connector
used where some
stress release
from the
abutment teeth is
desired.
Split lingual Plate

42. Split Lingual Major Connector
A complex construction
More costly
Greater demands on plaque control
Less well tolerated by the patient.
Split lingual Bar

43. • ققرت ببسي دئازلا حلملا نأ ملعت له
ماظعلا(Osteoporosis)
•و لضفأ نم اهنلأ كلذو ، بلقلل ةديفم ةلوارفلا نأ
ةدسكلأا تاداضم(Antioxidant) فايللأاب ةينغو ،
ىلع لمعت فايللأا هذهو ،نابوذلل ةلباقلا ةيئاذغلا
ءافك ةدايزو ،مدلا يف لورتسيلوكلا لدعم ضيفخت ة
ةيومدلا ةرودلا

45. Minor Connectors
Definition:
Functions:
1-Connectdifferentunitswithsaddle
ormajorconnector.
2-Transfertheeffectoftheconnected
components totheotherpartsof
thedenture.
3-Transferfunctionalstresstothe
abutmentteeth.
4-Providebracingandsometimes
reciprocation.
Itisthepartofthepartialdenture,that
connectsunitsoftheprosthesiswitheither
themajorconnectororthedenturebase.

46. Minor Connectors
It is the part of the partial
denture, that connects
units of the prosthesis with
either the major connector
or the denture base.
Minor connectors

47. Requirements:
1.There should be a minimum of 5mm space
between any two neighboring minor
connectors.
2.They should be inconspicuous to the
tongue.Therefore they are placed on the
guiding planes of abutments or in the
embrasure between teeth.
3.They should join the major connector at
right angleto cover as little as possible of
the gingiva.

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everybody, and Everybody will like you.....