Prosthetic Provisionals: Fabrication and Temporary Management

Why the provisional phase isn't just an aesthetic stopgap but a clinical step decisive for the success of the final restoration, and how materials differ for short- and long-term temporary crowns.

A prosthetic provisional is defined, according to the reference glossary of prosthetic terms, as a temporary restoration made to improve the aesthetics, stability and function of the prepared tooth during the period between preparation and placement of the definitive prosthesis. Beyond the technical definition, the provisional phase serves a clinical function far from secondary: it protects the exposed tooth structure from thermal sensitivity and irritation, allows the dentist to check shape and function before committing to the final fabrication, and — no less important — helps build patient confidence in the ongoing treatment, indirectly influencing perception of the final result.

The most commonly used materials are polymethyl methacrylate (PMMA) acrylic resins and bis-acrylic composite resins. The former offer excellent moldability, fast setting times and low cost, but tend to generate more heat during intraoral polymerization and have lower mechanical strength over time. Bis-acrylic resins, more recent, generally offer superior strength and aesthetics, making them the preferred choice for provisionals meant to remain in the mouth for longer periods or on more aesthetically demanding restorations like bridges and veneers.

The fabrication technique can be direct — built directly in the mouth by the dentist, typically on a preformed shell made from a pre-preparation situation — or indirect, made by the dental lab on a model, with greater precision but longer turnaround. In everyday practice, the provisional phase typically lasts a few weeks, roughly 30-40 days, the time needed to fabricate the final restoration in the lab; in special clinical cases — waiting for healing after periodontal or pre-prosthetic surgery, managing complex cases with multiple treatment phases — the duration can extend longer, but always remains time-limited due to the growing risk of bacterial infiltration at the margins as the provisional material wears.

With the evolution of the digital workflow, PMMA provisionals can now be designed using the same digital file later reused to produce the final restoration, simply adjusting parameters specific to the final material (for example thicknesses, if switching to zirconia). This approach reduces overall fabrication time and ensures shape continuity between provisional and final restoration, a non-trivial advantage when the provisional phase also served to validate aesthetics together with the patient.

On Oralzon you'll find acrylic and bis-acrylic resins for making direct and indirect provisionals, both for single units and multi-unit provisional bridges.