1 / 19

Basing materials (materials used to protect pulp): role, classification, indications.

Basing materials (materials used to protect pulp): role, classification, indications. Objectives :. Cavity preparation is relationship with pulp Explain the protecting the pulp with cavity

whitney
Download Presentation

Basing materials (materials used to protect pulp): role, classification, indications.

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Basing materials (materials used to protect pulp): role, classification, indications.

  2. Objectives: • Cavity preparation is relationship with pulp • Explain the protecting the pulp with cavity • Describe the purpose of using cavity liners, list the type of materials that can be used and explain the placement procedure • Describe the purpose of using cement base. List types of materials and placement procedure

  3. Introduction: • Should be familiar preparation of the cavity with the amount of enamel and dentin removed and how near the preparation is to the pulp • Should understand the pulp protection theory that the depth of cavity preparations and pulpal relation

  4. Cavity preparation/Pulp protection theory • The cavity preparation for a restoration depends on the amount of decay, the location of the decay, and the type of materials used to restore the tooth • Should examine the cavity preparation to assess pulpal involvement and then place the liners, base, or warnish

  5. Treatment of cavity preparations • Treatmentoftheidealcavitypreparation • Treatmentofthebeyond – idealcavity preparation 3. Treatmentofthenear – exposurecavitypreparation

  6. Treatment of the ideal cavity preparation: • A base is not required because only a minimal amount of enamel and dentin has been removed • Some dentists place only the restoration, while other prefer to place a fluoride –releasing liner • If an amalgam restoration is going to be placed, two thin layers of cavity varnish are often placed over the dentin • If a composite restoration is going to be used, a glass ionomer liner or calcium hydroxide is placed over the exposed dentin

  7. Treatment of the beyond – ideal cavity preparation • With a beyond –ideal preparation , the level of the dentin is restored with a cement base • With an amalgam restoration, there are several options. One option is to placetwo thin layers of varnish to seal the dentin tubules and then place a layer of a cement base, such as zinc phosphate

  8. Another option is a reinforced ZOE base which has a soothing effect on the pulp. Varnish is not used with this material • Other options include polycarboxylate or glass ionomer base, which also do not require varnish • Under composite restorative materials, use a glass ionomer base or calcium hydroxide

  9. Treatment of the near – exposure cavity preparation: • Thenearerthecavitypreparationcomes to thepulp, the more precautions are needed. There are alsoseveraloptionsoftreatmentofthenear-exposurepreparation • Cavitywhichgoing to restorewithamalgam, a linerofcalcium hydroxide , glassionomer , or ZOE isplacedfirst , then a layerof cement base suchasZincphosphate, polycarboxylate, or glassionomercements

  10. Another option for amalgam restoration is to place a liner, then a layer of reinforced ZOE, polycarboxylate, or glass ionomer cement. This is then sealed with cavity varnish , although some dentist do not place cavity varnish • Restore with composite, a liner is placed first, then place a layer of either polycarboxylate or glass ionomer cement • A cavity liner is placed on a near exposure, the procedure is often referred to as an indirect pulp capping

  11. Treatment of the exposed- pulp cavity preparation: • In an exposed pulp, should be decided whether endodontic treatment is indicated or should save the vitality of the tooth. • If the treatment of choice is to save the pulp, a procedure called a direct pulpcapping is performed

  12. Cavity liners • Cavity liners are placed in the deepest portion of the cavity preparation on the axial walls or pulpal walls • When the liners are hardened, they form as a cement layer with minimum strength • Liners are protect the pulp from chemical irritations and also provide a therapeutic effect to the tooth • Liners are calcium hydroxide, zinc oxide eugenol, and glass ionomer cement • Liners also called low-strength base

  13. On thisdirectpulpcappingtreatment, placethecalcium hydroxide or glassionomerliner and thenreinforced ZOE as a temporaryrestoration . Thisgives to thedentisttime to seewhetherthepulpisgoingtoheal • Anothertreatmentinvolvestheplacementof a liner, a layerof ZOE cement, twothinlayersofvarnish, and cement base • Somedentistprefer to place a liner and then a layerofpolycarboxylate or glassionomer cement base

  14. Placement of cavity liner in preparation

  15. Cavity varnish • Cavityvarnishisused to sealthedentinetubulestoprotectacids, saliva and debrisfromthepulp • Itisusedunderamalgamrestorations to preventmicroleakageandunderzincphosphate cement to preventpenetrationofacidtothepulp • Ifcavityliners or medicatedbased are used,varnishisplacedafter or on top ofthesematerials

  16. Placement of cavity varnish

  17. Cement bases • Cement bases are mixed to a thick putty and placed in the cavity to protect the pulp and provide mechanical support for the restoration • These cement bases are placed on the floor of the cavity • Cement bases are glass ionomers, hybrid ionomers, reinforced zinc oxide

  18. Placement of cement bases

More Related