Provisional restn


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Provisional restn

  2. 2. PROVISIONAL RESTORATION {TEMPORARY RESTORATION,TEMPORARISATION}: It is defined as a fixed or removal prosthesis designed to enhance esthetics stabilization and function for a limited period of time after a which it is to be replaced by definitive prosthesis.
  3. 3. The word provisional means established for the time being pending a permanent arrangement . This type of a restoration has also been known for many years as temporary restoration .
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  5. 5. The criteria for a provisional material are as follows 1. Convenient handling: adequate working time,easily moldability, rapid setting time. 2. Bicompatibility: nontoxic, nonallergic, nonexothermic 3. .Dimensional stability during solidification . 4. Ease of contouring and polishing .
  6. 6. 5.Adequate strength and abrasion strength. 6.Goodappearance,transclucent,colorcontrollable, colour stable. 7.Good patient acceptance,non irritating ,odorless. 8.Ease of adding to or reparing . 9.Chemical compatibility with provisional luting agent.
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  8. 8. Requirements of a Provisional Restoration: 1. Fit : A temporary crown must fit closely at the finish line of the preparation. This will help prevent tooth sensitivity and promote health of the surrounding gingiva.
  9. 9. 2. Occlusion: The provisional should establish or maintain adequate occlusal contacts. Without occlusal contacts, the prepared tooth may extrude Occlusal contacts on the provisional must not be too high. This will cause occlusal disharmony and may result in tooth sensitivity.
  10. 10. 3. Proximal contacts: The provisional must establish or maintain adequate proximal contacts to prevent movement of the prepared tooth in a lateral direction. Without proximal contacts, the tooth may drift.
  11. 11. Adequate esthetics: The temporary must have adequate contours, color, translucency and texture. This is especially important in anterior teeth
  12. 12. 5. Proper contours: A provisional must have proper contours for esthetics and for gingival health. In a fixed partial denture, the pontic must be contoured so that it is as self cleansing as possible.
  13. 13. The photo at right shows an improperly contoured fixed partial denture.
  14. 14. 6. Strength: Provisionals must be of adequate thickness to withstand occlusal forces without cracking.
  15. 15. Material used to fabricate provisional restorations can be classified as acrylics or resin composites. Subcategories are based on method of polymerization (e.g., chemically activated, light activated, dual activated).
  16. 16. AcrylicsAcrylics : They are the most commonly used materials today for both single-unit and multiple-unit restorations. due to their low cost, esthetics, and versatility. They produce acceptable short-term provisionals but tend to discolor over time. Other disadvantages are an objectionable odor, significant shrinkage and heat generation during setting, and messiness during mixing.
  17. 17. The three types of acrylics used are : 1. polymethyl methacrylates 2. poly-R’ methacrylates(where R’ represents either ethyl,vinyl,or isobutyl groups), and 3. epimines.
  18. 18. Preformed materials Preformed provisional crowns or matrices usually consist of tooth-shaped shells of plastic, cellulose acetate, or metal. They are commonly relined with acrylic resin to provide a more custom fit before cementation, but the plastic and metal crown shells can also be cemented directly onto prepared teeth using a stiff luting material following adjustment.
  19. 19. Metal Metal provisional materials are generally esthetically limited to posterior restorations. Aluminum shells provide quick tooth adaptation due to the softness and ductility of the material, but this same positive quality can also promote rapid wear that results in perforation in function and or extrusion of teeth.
  20. 20. Pulpal response Dental pulp inflammation can be caused by either thermal or chemical insult resulting from materials used to produce direct provisional restorations. Hypersensitivity Hypersensitivity from provisional materials has been reported but appears to be rare.
  21. 21. Provisional luting materials Provisional luting agents should possess good mechanical properties, low solubility, and tooth adhesion to resist bacterial and molecular penetration. The most important function of these materials is to provide an adequate seal between the provisional restoration and prepared tooth. This is necessary to prevent marginal leakage and pulpal irritation.
  22. 22. There are a variety of luting materials used for interim purposes. The most commonly used luting materials include : (1)Calcium hydroxide (2) Zinc - oxide and eugenol (3) Non - eugenol materials. Generally, all of these possess poor mechanical properties that likely worsen over time.
  23. 23. This can have a negative influence on marginal leakage but also provides an advantage by allowing easier dislodgment and removal of provisional restorations from teeth. The retentive requirements for provisional luting materials are that they be strong enough to retain a provisional restoration during the course of treatment but allow easy restoration removal when required. This necessity for good retentive and sealing quality and easy restoration retrieval may lead to a compromise in material behavior, particularly regarding mechanical properties.
  24. 24. Types of provisional restorations: Many different types of procedures are used to construct provisional. Provisional construction can be categorized into two main methods: 1. Custom temporaries - those that are made with a matrix derived from the original tooth or a modified diagnostic cast. Custom temporaries can be constructed in three different manners: 2. Direct: these are constructed with a matrix lined with provisional material that is placed directly on the prepared tooth
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