Principles Of Tooth Preparation PDF

Principles Principles Of Tooth Of Preparation Tooth Preparation Dr.Wayel Mohammed Huraib Dr.Wayel Mohammed Huraib Consultant in Prosthodontics Fixed Prosthodontics-D3 15/09/2021  Principles Of Tooth Preparation Teeth do not possess the regenerative ability found in mo...

Principles Principles Of Tooth Of Preparation Tooth Preparation Dr.Wayel Mohammed Huraib Dr.Wayel Mohammed Huraib Consultant in Prosthodontics Fixed Prosthodontics-D3 15/09/2021  Principles Of Tooth Preparation Teeth do not possess the regenerative ability found in most other tissues. Therefore, once enamel or dentin is lost as a result of caries, trauma, or wear, restorative materials must be used to reestablish form and function. Principles Of Tooth Preparation Principles Of Tooth Preparation 1 Biological Considerations  Principles Of Tooth Preparation I Biological Considerations I- Surgical precision crucial : Surgical procedures on living tissues require careful execution to prevent unnecessary damage.  Principles Of Tooth Preparation I Biological Considerations II- Consequences of poor preparation: Inadequate marginal t or de cient crown contour resulting from poor preparation can complicate plaque control around xed restorations. fi fi fi  Principles Of Tooth Preparation I Biological Considerations III- Risks to adjacent structures: Teeth, soft tissues, and the pulp of the prepared tooth are susceptible to damage during tooth preparation.  I Prevention of Damage During Tooth Preparation Biological Considerations 1- Adjacent teeth Iatrogenic Damage to Adjacent Teeth: Common error in dentistry involves iatrogenic damage to adjacent teeth during procedures. Reshaping and polishing a damaged proximal contact area may not prevent increased susceptibility to dental caries compared to the original undamaged tooth surface.  I Prevention of Damage During Tooth Preparation Biological Considerations 1- Adjacent teeth To protect the Adjacent tooth: - Use a Metal matrix band - Use a thin tapered diamond  Principles Of Tooth Preparation I Biological Considerations 2- Soft tissues. To prevent a damage to the soft tissues - retraction with an aspirator tip, mouth mirror.  Principles Of Tooth Preparation I Biological Considerations 3- Pulp. Extreme temperatures, Chemical irritation, or microorganisms can cause an irreversible pulpitis  Principles Of Tooth Preparation I Biological Considerations 3- Pulp. Pulp size which can be evaluated on a radiograph and decreases with age.  Principles Of Tooth Preparation I Biological Considerations 3- Pulp. Temperature Excessive pressure, higher rotational speeds, and the type, shape, and condition of the cutting instrument increase generated heat.  Principles Of Tooth Preparation I Biological Considerations 3- Pulp. ! Temperature Even with the lightest touch, the tooth overheats unless a water spray is used.  Principles Of Tooth Preparation I Biological Considerations 3- Pulp. Chemical Action Bases, Restorative Resins, Solvents, and Luting Agents can cause palpal damage, particularly when they are applied to freshly cut dentin.  Principles Of Tooth Preparation I Biological Considerations 3- Pulp. ! Bacterial Action All carious dentin should be removed before placement of a restoration that will serve as a foundation for a xed prosthesis. fi  Principles Of Tooth Preparation I Biological Considerations Tooth structure is conserved through adherence to the following guidelines: 1- Use of partial coverage rather than complete coverage restorations.  Principles Of Tooth Preparation I Biological Considerations Tooth structure is conserved through adherence to the following guidelines: 2- Preparation of teeth with the minimum practical convergence angle (taper) between axial walls  Principles Of Tooth Preparation I Biological Considerations Tooth structure is conserved through adherence to the following guidelines: 3- Preparation of the occlusal surface so that reduction follows the anatomic planes to give uniform thickness in the restoration.  Principles Of Tooth Preparation I Biological Considerations Tooth structure is conserved through adherence to the following guidelines: 4- Preparation of the axial surfaces so that a maximal thickness of residual tooth structure surrounding pulpal tissues is retained.  Principles Of Tooth Preparation I Biological Considerations Tooth structure is conserved through adherence to the following guidelines: 4- If necessary, teeth should be orthodontically repositioned.  Principles Of Tooth Preparation I Biological Considerations Tooth structure is conserved through adherence to the following guidelines: 5- Selection of a margin geometry that is conservative and yet compatible with the other principles of tooth preparation  Principles Of Tooth Preparation I Biological Considerations Tooth structure is conserved through adherence to the following guidelines: 6- Avoidance of unnecessary apical extension of the preparation.  Principles Of Tooth Preparation I Biological Considerations Margin Placement I Supra-gingival Margin II Subgingival Margin  Principles Of Tooth Preparation I Biological Considerations Margin Placement I-Supragingival Margin. They can be easily nished without associated soft- tissue trauma. fi  Principles Of Tooth Preparation I Biological Considerations Margin Placement I-Supragingival Margin. They are more easily kept plaque free.  Principles Of Tooth Preparation I Biological Considerations Margin Placement I-Supragingival Margin. Impressions are more easily made, with less potential for soft tissue damage.  Principles Of Tooth Preparation I Biological Considerations Margin Placement I-Supragingival Margin. Restorations can be easily evaluated at the time of placement or at recall appointments  Principles Of Tooth Preparation I Biological Considerations Margin Placement II-Subgingival Margin. Dental caries, cervical erosion, or restorations extend subgingivally.  Principles Of Tooth Preparation I Biological Considerations Margin Placement II-Subgingival Margin. The proximal contact area extends to the gingival crest.  Principles Of Tooth Preparation I Biological Considerations Margin Placement II-Subgingival Margin. Additional retention and/or resistance is needed  Principles Of Tooth Preparation I Biological Considerations Margin Placement II-Subgingival Margin. The margin of a metalceramic crown is to be hidden behind the labiogingival crest.  Principles Of Tooth Preparation I Biological Considerations Margin Placement II-Subgingival Margin. Root sensitivity cannot be controlled by more conservative procedures, such as the application of dentin bonding agents. Principles Of Tooth Preparation