78786739 Fixed Partial Denture 1

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    INTRODUCTION, TERMINOLOGY,INTRODUCTION, TERMINOLOGY,

    CLASSIFICATION,CLASSIFICATION,

    INDICATIONS& CONTRAINDICATIONSINDICATIONS& CONTRAINDICATIONS

    ADVANTAGES& DISADVANTAGESADVANTAGES& DISADVANTAGES

    Seminar by H.SUNILSURESHSeminar by H.SUNILSURESH

    FIXED ARTIALFIXED ARTIALDENTUREDENTURE

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    DEFINITION:DEFINITION:

    Fixed partial denture is a partial dentureFixed partial denture is a partial denturethat is luted or otherwise securelythat is luted or otherwise securelyretained to natural teeth, tooth roots andretained to natural teeth, tooth roots andor dental implant abutments that furnishor dental implant abutments that furnishthe primary support for the prosthesesthe primary support for the prostheses

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    CLASSIFICATION OFCLASSIFICATION OF

    F!F!

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    Conventional and minimal-Conventional and minimal-preparation bridges

    preparation bridges""

    Con#entional brid$es in#ol#eCon#entional brid$es in#ol#e

    remo#in$ tooth tissue, or a pre#iousremo#in$ tooth tissue, or a pre#iousrestoration, and replacin$ it with arestoration, and replacin$ it with aretainer% This may be destructi#e ofretainer% This may be destructi#e of

    tooth tissue and will certainly be timetooth tissue and will certainly be timeconsumin$ and expensi#e%consumin$ and expensi#e%

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    &inimal' preparation brid$e in#ol#es&inimal' preparation brid$e in#ol#esattachin$ pontics #ia a metal plate toattachin$ pontics #ia a metal plate to

    the unprepared (or minimally prepared)the unprepared (or minimally prepared)

    lin$ual surfaces of ad*acent teeth%lin$ual surfaces of ad*acent teeth%

    Attachment is made by a compositeAttachment is made by a composite

    resin material, ob#iously these brid$esresin material, ob#iously these brid$es

    can be used only when the abutmentcan be used only when the abutment

    teeth ha#e su+cient intact enamel%teeth ha#e su+cient intact enamel%

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    Classication of Fixed partial dentureClassication of Fixed partial denture

    is basically based on theis basically based on the

    -% !esi$n of the brid$es, the-% !esi$n of the brid$es, the

    di.erence bein$ the type of supportdi.erence bein$ the type of supportpro#ided at each ends of the pontic%pro#ided at each ends of the pontic%

    /% Types of materials used for brid$es%/% Types of materials used for brid$es%

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    DESIGNS:DESIGNS:There are four basic desi$ns ofThere are four basic desi$ns ofbrid$e, the di.erence bein$ the typebrid$e, the di.erence bein$ the typeof support pro#ided at each end ofof support pro#ided at each end of

    the pontic, namely"the pontic, namely"-% FI01!'FI01! 23I!41-% FI01!'FI01! 23I!41

    /%FI01!' &O5A2L1 23I!41/%FI01!' &O5A2L1 23I!41

    6%CANTIL1513 23I!416%CANTIL1513 23I!417%S3IN4 CANTIL1513 23I!417%S3IN4 CANTIL1513 23I!41

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    The four basic desi$ns are the sameThe four basic desi$ns are the samewhether the brid$e is a con#entionalwhether the brid$e is a con#entional

    or minimal' preparation type% It isor minimal' preparation type% It ispossible to combine / or more of thepossible to combine / or more of thefour basic desi$ns and to combinefour basic desi$ns and to combinecon#entional and minimal'preparationcon#entional and minimal'preparation

    retainers in the same brid$e%retainers in the same brid$e%

    Of the four desi$ns, the rst 6 desi$nsOf the four desi$ns, the rst 6 desi$ns

    may be either con#entional ormay be either con#entional orminimal'preparation types% It isminimal'preparation types% It isunusual to ha#e a minimal'preparationunusual to ha#e a minimal'preparationtype in sprin$ cantile#er brid$e%type in sprin$ cantile#er brid$e%

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    FOUR !ASIC DESIGNSFOUR !ASIC DESIGNS".". FIXED#FIXED !RIDGEFIXED#FIXED !RIDGE""

    A Fixed'Fixed brid$e has a ri$id connectorA Fixed'Fixed brid$e has a ri$id connectorat both ends of the pontic%at both ends of the pontic%

    The abutment teeth are therefore ri$idlyThe abutment teeth are therefore ri$idly

    splinted to$ether, and for a con#entionalsplinted to$ether, and for a con#entionalbrid$e, must be prepared parallel to eachbrid$e, must be prepared parallel to eachother so that the brid$e, which is aother so that the brid$e, which is aminimum of 6 units, can be cemented inminimum of 6 units, can be cemented inone piece%one piece%

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    The retainers should ha#eThe retainers should ha#eapproximately the same retention asapproximately the same retention as

    each other to reduce the ris8 that forceseach other to reduce the ris8 that forcesapplied to the brid$e will dislod$e oneapplied to the brid$e will dislod$e oneretainer from its abutment, lea#in$ theretainer from its abutment, lea#in$ thebrid$e suspended from the otherbrid$e suspended from the other

    abutment%abutment%

    To minimi9e this ris8, it is also importantTo minimi9e this ris8, it is also important

    for the entire occludin$ surfaces of allfor the entire occludin$ surfaces of allthe abutment teeth for a con#entionalthe abutment teeth for a con#entionalbrid$e to be co#ered by the retainers%brid$e to be co#ered by the retainers%

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    The opposin$ teeth cannot then contactThe opposin$ teeth cannot then contactthe surface of an abutment tooth,the surface of an abutment tooth,depress it in its soc8et and brea8 thedepress it in its soc8et and brea8 thecement lute%cement lute%

    If this should happen, the retainer will notIf this should happen, the retainer will notappear loose since it will be held in placeappear loose since it will be held in placeby the rest of the brid$e% :owe#er, oralby the rest of the brid$e% :owe#er, oral

    ;uids will enter the space between the;uids will enter the space between theretainer and the abutment preparation,retainer and the abutment preparation,and caries will rapidly de#elop%and caries will rapidly de#elop%

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    This rule does not apply to minimal

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    /%/% FI01!' &O5A2L1 23I!41"FI01!' &O5A2L1 23I!41"

    A Fixed' mo#able brid$e has a ri$idA Fixed' mo#able brid$e has a ri$idconnector, usually at the distal end of theconnector, usually at the distal end of thepontic, and a mo#able connector thatpontic, and a mo#able connector that

    allows some #ertical mo#ement of theallows some #ertical mo#ement of themesial abutment tooth%mesial abutment tooth%

    The mo#able connector should resist bothThe mo#able connector should resist bothseparation of the pontic from the retainerseparation of the pontic from the retainerand lateral mo#ement of the pontic%and lateral mo#ement of the pontic%

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    Occasionally the xed and mo#ableOccasionally the xed and mo#able

    connectors are re#ersed, but this hasconnectors are re#ersed, but this has

    number of disad#anta$es%number of disad#anta$es%

    The retainer with the mo#able connectorThe retainer with the mo#able connector

    (the minor retainer) is smaller and less(the minor retainer) is smaller and less#isible and so is better in the more#isible and so is better in the more

    anterior abutment tooth% osterior teethanterior abutment tooth% osterior teeth

    commonly tilt mesially, and this tends tocommonly tilt mesially, and this tends to

    unseat distal mo#able connectors, but isunseat distal mo#able connectors, but is

    resisted by mesial ones%resisted by mesial ones%

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    The mo#able connector can be separatedThe mo#able connector can be separated

    before the brid$e is cemented, and so thebefore the brid$e is cemented, and so the

    two parts of the brid$e can be cementedtwo parts of the brid$e can be cemented

    separately%separately%

    The abutment teeth do not therefore ha#eThe abutment teeth do not therefore ha#eto be prepared parallel to each other andto be prepared parallel to each other and

    the retention for the minor retainer does notthe retention for the minor retainer does not

    need to be as extensi#e as for the ma*orneed to be as extensi#e as for the ma*orretainer% Neither does it need full occlusalretainer% Neither does it need full occlusal

    protection%protection%

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    Occlusal forces applied to the toothOcclusal forces applied to the toothsurface not co#ered by the retainer willsurface not co#ered by the retainer will

    depress the tooth in its soc8et, anddepress the tooth in its soc8et, andthere will be mo#ement at the mo#ablethere will be mo#ement at the mo#able*oint rather than rupturin$ of the*oint rather than rupturin$ of thecement lute%cement lute%

    A xed' mo#able minimal' preparati