Successful crown and bridgework relies heavily upon the precise use of temporary restorations. It is the importance of this stage in crown and bridgework, perhaps more than any other, that is so often underestimated.
The primary requirement of a temporary restoration is to maintain the health of the tissues. Pulp vitality should be protected and plaque control facilitated. It is also essential that the tooth position is stabilized and the appearance of the teeth made acceptable during this temporary period.
Temporary restorations are needed to maintain pulp vitality, occlusal position and acceptable esthetics.
Temporary restorations are needed to assess new occlusal contacts and new esthetics.
Temporary restorations are needed to allow resolution of gingival inflammation and peripheral lesions.
Precise and predictable outcome using CAD/CAM technology
Validations
Fabrication of provisional restorations is an important procedure in fixed prosthodontics. Provisional restorations must satisfy the requirements of pulpal protection, positional stability, occlusal function, ability to be cleansed, margin accuracy, wear resistance, strength, and aesthetics. They serve the critical function of providing a template for the final restorations once they have been evaluated intraorally. Provisional restorations in fixed prosthodontic rehabilitation are important treatment procedures, particularly if the restorations are expected to function for extended periods of time or when additional therapy is required before completion of the rehabilitation. Interim procedures also must be efficiently performed, because they are done while the patient is in the operatory and during the same appointment that the teeth are prepared. Costly chair side time must not be wasted, but the dentist must produce an acceptable restoration. Failure to do so results in the eventual loss of more time than was initially thought saved. A well-made provisional fixed partial denture should provide a preview of the future prosthesis and enhance the health of the abutments and periodontium. The theories and techniques of fabrication for numerous types of provisional restorations abound in the dental literature.
(Regish et al. Techniques of Fabrication of Provisional Restoration: An Overview, International Journal of Dentistry Volume 2011)
Maximum Force at the Fracture (N) of Milled PMMA and Conventional Direct Resin
| Fabrication Technique | Type | Force at Fracture (N) | |
| Mean | SD | ||
| Conventional Direct | Methyl Methacrylate | 657.87 | 82.84 |
| CAD/CAM Milling | PMMA | 953.60 | 58.88 |
(Reeponmaha et al., Comparison of fracture strength after thermo-mechanical aging between provisional crowns made with CAD/CAM)