Reality Check #9

8/3/2019 Reality Check #9

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DESIGNING CLASS III RPDS

WHATS THE DIFFERENCE BETWEEN I & II vs. III?


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?????How supported.Impressions needed.Direct retainers usedDenture base materialIndirect retention needs


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Essentially Teeth

How supported.


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Impressions needed.

Single impression that is usually alginate.


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Direct retainers used.

Anything goes but usually a cast clasp of some sort.


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Indirect retention needs

Since the edentulous area is supported at both ends with rests and direct retentionthen no rotary movement and thus no need for I.R.


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1. Where place rests?


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Where are guide planes located?


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How effective do you think the G.P.s on the mesial of the cuspids will be compared to those on the posterior teeth?CAUTION! Dont extend your guide plane preparation anyfurther than halfway to the facial of anterior teeth or you willremove the proximal height of contour and ruin the esthetics ofthese teeth.


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What major connector should I use?First ask your self why cant I use a ? for each arch.

LIGUAL BAR ON MANDIBLEA-P BAR ON MAXILLAE

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 strongenough to unite the parts.


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DENTURE BASE RETENTION

What are your needs????-space-alveolar bone replacement-esthetics


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RECIPROCATION

Whatever fits the bill!

INDIRECT RETENTION

Needed in Class III?

MINOR CONNECTOR

Make sure everything is connected to the major connector.

Reality Check #9

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Transcript of Reality Check #9