my seminar

1. Different designs of bridges
By
Yasmin Mohammed
Group e2
University of Baghdad/college of dentistry

2. Fixed partial denture
•It is a fixed dental prosthesis which replace
and restore the function and esthetic of one
or more missing natural teeth ,it can not be
removed from the mouth by the patient. It
is primarily supported by natural teeth or
root .

3. The bridge consists of
:
1. Retainer : it is the part
of the bridge which is
cemented to the
abutment teeth .it could
be full metal ,full veneer
with facing , partial
veneer , post crown or
inlay … etc .

4. 2. Pontic
Is the part of the
bridge which
represent the missing
tooth and it
connected to the
retainer by a
connector

5. 3. Connector
is the part of the
bridge which connect
the pontic and the
retainer , it maybe
rigid (solid joint ) or
movable joint
(precision attachment
, key and key way )

6. Types of connectors
•1. rigid
•2. non rigid
•_tenon mortise conectors
•_loop connectors
•_split pontic connectors
•_cross pin and wing connectors

7. Tenon mortise

8. Loop connectors split pontic

9. Cross pin and wing connectors

10. 4. Abutment
Is the natural tooth
which support the
bridge and on
which the retainer
is cemented (tooth
or root )

11. Crown_ root ratio
•Is the measurement of the length of tooth occlusal to
the alveolar crest of the bone compare with the
length of root embedded in the bone . The ideal
crown root ratio for a tooth to be used as a bridge
abutment is 1:2 , and the minimum ratio acceptable
for prospective abutment under normal circumstances
is 1:1 .

13. Antews low
•The root surface area (pericemental area
)of the abutment teeth should be more
or at least equal to the root suface area
(pericemental area )of the missing teeth
being replace .

14. Types of bridges
•There are 4 main type of bridges
•1. fixed _ fixed bridge
•2. fixed movable bridge
•3.cantilever bridge
•4.resin bonded bridge (conservative bridge )

15. Fixed _fixed bridge
•In this type the pontic is attached to the
retainers (mesial and distal)by rigid
connector(solid joint) so they should
have one path of insertion . This is the
most commonly used FPD .

17. Advantages :
•1. maximum retention and support .
•2. abutment teeth are splinted together .
3. the design is most practical for larger bridges .
disadvantages
1.require preparation to be parallel
2. All the retainers are major retainers and require extensive
,destructive preparation of the abutment teeth .
3.Has to be cemented in one piece .

18. Fixed movable bridge
•In this type the pontic is attached to one distal
major retainer (distal end of the pontic )by fixed
connector while the other end is attached to the
minor retainer (in front of pontic )by movable
joint .it s indicated in case of drifted abutment
teeth and difficulty to obtaining parallel
abutments.

19. Advantages:
•1. preparations do not need to be parallel to each other .
•2. more conservative of tooth tissue because preparations for minor
retainers are less destructive .
•3. parts can be cemented separately .
•Disadvantages
•1.more complicated to construct in laboratory than fixed
fixed bridge .
•2.difficult to make temporary bridge .

24. Preoperative picture

25. Tooth preparation for porcelain fused to metal
restorations

26. Case
Prefabricated castable
bar attached between
waxed up copings

27. Metal try-in

28. Bar attached parallel to the ridge on palatal
aspect

29. Waxed up trial denture for removable partial
denture

30. Wax added on labial flange of removable
partial denture for lip support

31. Final cementation of porcelain fused to metal
fixed partial denture and fixed component of
Andrew's Bridge

32. Andrews bridge placement