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DESIGNING CLASS II RPDS

Generally more favorable than Class I.If no mod space on opposite side can present problems.

Potential for long lever arm forward of the fulcrum line.

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1. Where place rests?

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1

2

2

22

1. Mesial occlusal on terminal abutments.2. Adjacent to tooth bounded edentulous area.2. On cuspids also distribute stress = equal loads transferred to teeth.2. Cuspids can be incisal or possibly cingulum.

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Where are guide planes located?

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What is the rule for their location?

How effective do you think the G.P.s on the mesial of the cuspids will be compared to those on the posterior teeth?

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What major connector should I use?

First ask your self why cant I use a ? for each arch.

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Lingual Bar A-P Bar

FIRST CHOICE IS

Know the factors which enter into selection of M.C.!

REMEMBER: in modification areas you must have the M.C. extendingacross the space and not leave it as meshwork only which is not strong

enough to unite the parts.

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1. On the extension side need what in order to be able to reline?2. On the modification side what are your options?

DENTURE BASE RETENTION

1.

2.

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1. Mesh of some sort in order to be able to reline.2. What are your needs here?

-replace missing tissue use mesh with falnge.-vertical space restriction consider metal base with beads or studs.

DENTURE BASE RETENTION

1.

2.

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What direct retainers can be used on terminal abutmentson distal extensions?

What direct retainers can be used forward of the fulcrum line?

What direct retainers can be used on the posterior modification space abutment?

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Circumferential W.W. or I-bar. Or if only a DF undercut then what?????

Circumferential W.W. If dont clasp what other component could be utilized instead?

Cast circumferential into a DB undercut most cases. If no DB undercutcould consider an infrabulge or a ring clasp going into a MB undercut.

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RECIPROCATION

Whatever fits the bill!

INDIRECT RETENTION

X X

In most cases indirect retention has already been taken care of by rest requirements addressed earlier but still might run into a case where anadditional rest for I.R. might be needed.

MINOR CONNECTORMake sure everything is connected to the major connector.