FIXED PARTIAL DENTURE

THE PROCESS
1. Treatment planning
a. See if abridge is possible
b. Check the health of the abutment
c. Check if we can follow Ante’s law
d. Choose the pontic
2. Primary Impression-for temporary bridge
3. Crown preparation
4. Take the Impression
5. Pour cast
6. Provisional restoration
7. Crown from lab
8. Cementation

ABUTMENT TEETH
 It is not a part of FPD unit / Bridge itself !
 Selection
o Should have Well sounded periodontium
o Must fullfill ante’s law
o Caries if any must have been restored
o Should be able to withstand force
o Must be in alignment with the common path of insertion (not tilted cases)
 Best abutment — ankylosed teeth
- Diverging multirooted, curved roots preferred to fused, single conical roots
 Least preferred — endo treated tooth
- 3rd molar if it is tilted, short-fused root.


ANTE’S LAW:-
States thaaaat : Root surface area of the 2 orrrr three abutment teeth supported by bone should be greater than or at least equal to, to the root surface area of the tooth or teeth that is being replaced.

Root/Crown Ratio:-
𝑅𝑜𝑜𝑡/𝐶𝑟𝑜𝑤𝑛 =2/1 --- ] 𝐼𝑑𝑒𝑎𝑙
𝑅𝑜𝑜𝑡/𝐶𝑟𝑜𝑤𝑛=3/2 ----- ] 𝑟𝑒𝑐𝑜𝑚𝑚𝑒𝑛𝑑𝑒𝑑

2 abutments 1 pontic 3 abutment teeth 2 pontics

Remember, Crown is always the lesser no.
It will be easy to remember if they alter the ratio position,

𝑅𝑜𝑜𝑡/ 𝐶𝑟𝑜𝑤𝑛 = 1/1 --- ] 𝑚𝑖𝑛𝑖𝑚𝑢𝑚
Cantilever for lateral


Q. crown to root ratio: a. ideal 1-2 b. Optimum 2-3 c. normal 1-1.5 d. acceptable 1-1.