Interim Fixed Restorations PDF

Interim Fixed Restorations (TEMPORIZATION)  Interim Fixed Restorations Requirements. Materials and procedures. Post and core interim restorations. Cementations.  Biological Mechanical Pulp Resist functional Periodontium load O...

Interim Fixed Restorations (TEMPORIZATION)  Interim Fixed Restorations Requirements. Materials and procedures. Post and core interim restorations. Cementations.  Biological Mechanical Pulp Resist functional Periodontium load Occlusion Resist removal Position force fracture Alignment Esthetic Easily contourable Color compatibility Translucency Color stability  Biologic a) Pulp: Against Thermal, chemical and physical irritation b) Periodontium: By enhancing oral hygiene procedures c) Occlusion and position: maintain proper contacts both proximal and occlusion d) Fracture: protecting the prepared tooth from possible fracture  Biological Mechanical Pulp Resist functional Periodontium load Occlusion Resist removal Position force fracture Alignment Esthetic Easily contourable Color compatibility Translucency Color stability  Mechanical Resistance to functional load and removal forces  Mechanical Maintain interabutment alignment  Biological Mechanical Pulp Resist functional Periodontium load Occlusion Resist removal Position force fracture Alignment Esthetic Easily contourable Color compatibility Translucency Color stability  Esthetic Areas visible during talking and smiling should be restored temporarily to avoid psychological trauma  Interim Fixed Restorations Requirements. Materials and procedures. Post and core interim restorations. Cementations.  Types of Temporary Restorations Intra-coronal Restorations: For Inlay prep. Extra-coronal Restorations: 1- Custom made acrylic resin crown and bridge 2- Prefabricated crowns: a- Tooth colored polycarbonate crown b)Clear cellulose acetate crown form c) Prefabricated metal crowns e.g. aluminum shell, aluminum anatomic, stainless steel and Ni-chromium anatomic crowns.  Custom Made Temporary Restoration  Formed directly in the patient's mouth or indirectly on the cast.  Application of temporary self curing resin over fresh cut dentin may cause pulpal irritation.  However, it is usually safe due to brief period of contact.  Characteristics of an ideal provisional material  Convenient handling  Biocompatibility  Dimensional stability  Ease of contouring and polishing  Adequate strength  Acceptable appearance  Acceptability to patient  Ease of adding or repairing  Chemical compatibility with provisional luting agents Currently available provisional materials Poly-methyl methacrylate Poly-ethyl methacrylate resin resin Microfilled composite resins Light cured microfilled with AutoMix delivery system resins Fabrication of custom made temporary restorations Direct technique Indirect technique for fabrication of custom made temporary restoration Indirect-direct technique for fabrication of custom made temporary restoration Prefabricated polycarbonate temporary crown  Prefabricated cellulose acetate crown forms  The celluloid crown former is selected according to the M-D width  It is filled with resin then seated over the prepared tooth and the excess is removed.  It does not bond to the resin, so it must be removed by slicing  This leads to loss of the proximal contact and requires additional material to be added to these areas.  If left in place, it may peel away during function and lead to loss of contact.  Adjustment and cementation. Prefabricated metal crown  Interim Fixed Restorations Requirements. Materials and procedures. Post and core interim restorations. Cementations. Temporary restoration for endodontically treated tooth Temporization of laminate veneers  Interim Fixed Restorations Requirements. Materials and procedures. Post and core interim restorations. Cementations.  Temporary cementation The primary function of the temporary luting agent is to provide a seal against marginal leakage It should not be relied upon to resist occlusal forces.  Ideal properties of temporary luting agent  Seal against leakage of oral fluids  Strength consistent with intentional removal  Low solubility  Obtundent effect on the pulp  Chemical compatibility with resins used  Convenience of dispensing and mixing  Ease of eliminating excess  Adequate working time and short setting time o Of the currently available materials zinc oxide- eugenol cements appear to be the most satisfactory. o Unfortunately, free eugenol acts as a plasticizer of methacrylate resins reducing its surface hardness and accordingly strength. o Non-eugenol cements have been used which have a liquid of either: - Ortho-methoxy phenol - Ortho-methoxy benzoic acid - Ortho-ethoxy benzoic acid. Steps of cementation Thank you