major connectors

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  • Major Connector Tanta UNIversity Fatema al zhraa alhaj omar

  • Definition Major Connectors is the of PD that connect parts of prosthesis from one side to other side& all other parts of RPD are attached to it directly or indirectly

  • Functions Make RPD as a one unit Equal stress distribution at the parts of RPPD Cross arch stabilization If it rested on hard tissue give support (unless if it rested on soft tissue , relief must be done

  • Requirements Rigid to give equal distribution of forces should be comfort to patientshouldn't interference with movable tissue shouldn't impingement of gingival margins (maxilla at least 6mm from margins mandible at least 3-4 mm from gingiva)shouldn't have sharp edges or margins Should be perpendicular at minor connector but with gentle curve Avoid food impactiondesigned to be self cleansable area

  • Types of mandibular major connectors Lingual bar lingual plateDouble lingual bar ( lingual bar with a continuous bar indirect retainer) labial bar (plate) cingulum bar sublingual bar

  • 1- Lingual bar The most common used The simplest major connector

    *

  • Design of lingual bar1. it is half pear shape (flat to floor )2. superior portion is thin& inferior portion is thick 3. superior portion should be away from gingival at least 3-4mm4. portion should be present as low as floor of the mouth5. if lingual undercut present, relief should be done

  • Advantages # Disadvantages* Advantages1. simple 2.accebted tongue 3. No interference to gingiva * Disadvantagesit is rigid if poorty constructed

  • 2- lingual plate major connectorUse it if I have not convenient height to use ling.bar(
  • Design lingual plate Cover gingiva and cingulum of ant teethMust have cingulum rest

    **indication:1- functional bar < 7mm2- more rigidity needed

    ***contraindication :Ant.teeth inclined linguallytorus mandibularis

  • Advantages # DisadvantagesAdvantages:Most rigid M.CAct as indirect retainer Reflection food Resist horizontal forces Cross arch stabilizationSplinting RPD as one unit

    iDisadvantages:Gingival irritationPeriodontal disease No gingival stimulation

  • Double lingual bar (LINGUAL BAR WITH CONTINUOUSBAR INDIRECT RETAINER)Indications:1. Situations where the majorconnector must contact thenatural teeth to providebracing and indirect retentionand there are open cervicalembrasures whichcontraindicate the use of alingual plate. There must be adequate space for the lingualbar portion of the major connector.Contraindications:1. Where a lingual bar orlingual plate will suffice.2. Any contraindication for alingual bar.3. Any contraindication for alingual plate except opencervical embrasures.4. Diastemas.

  • Double lingual bar design rest seat preparation needed As lingual plate but have a space at the middle Half oval shaped

  • Advantages # DisadvantagesAdvantages:

    More rigid than lingual bar.Indirect retainer Horizontal stabilization 4. Covers less tooth and tissuesurface than lingual plate.Disadvantages: 1. Very complex design.2. May be objectionable topatient because there are fouredges exposed to the tip ofthe tongue.3-food impaction

  • Maxillary major connectors Anterior palatal bar Posterior palatal barMiddle palatal barAnterio posterior palatal bar (ring design )Anterior palatal strap Middle palatal strap Anterio posterior palatal strap (closed horse shoe )Complete plate

  • Maxillary major connectors

  • 1. Antero posterior palatal bar(ring design)Indication 1- used when rigidity is important 2- used in any class especially when the anterior and posterior abutments are widely separated 3- little palatal coverage is needed in case with large palatal toni

  • 1. Antero posterior palatal bar(ring design)Advantages rigid minimal coverage of palate

    Disadvantages poor support may be thick to overcome the support problem anterior bar may interfere with speech

  • 1. (ring design)Design borders should be smooth ant. bar is flat& post is curved

  • 2. Closed horses shoes (aniero posterior palatal strapIndication class I or ll when anterior teeth are to be replaced used when tours palatines is present used with all PD designs

  • 2. Closed horses shoes (aniero posterior palatal strap Advantages very rigid connector give good support from palate

    Disadvantages more palatal coverage may be less tolerant

  • 2. Closed horses shoes (aniero posterior palatal strapDesign details uniform thickness finished border should be smooth it should be located at least 6mm away from gingival margins

  • 3.Complete palate it cover wide area of palate than any other type of max connectors it should extended anteriory at least 6mm away from gingival margins cover cingula of teeth with relief of gingival margins

  • 3.Complete palate Indication long space in class I long saddle in heavy bite poor rigid& need for retention in patient with cleft palate

  • 3.Complete palate Advantages give highly support give highly retention give highly bracing(resist lateral forces) wide distribution of vertical forces which decrease destruction of abutment teeth

    Disadvantages not used if present of tours palatines interfere with speech

  • 3.Complete palate Types complete metal complete acrylic metallic ant palatal connector with acrylic posterior extension

    Design it should be located at least 6mm away from gingival margins border should be extended as complete

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