From a clinical perspective, the temporary phase is a step of crucial importance for successful treatment during a restoration process. In actual fact, a good temporary phase allows the dentist to earn the patient’s trust and favourably influence the future success of the final restoration.
The purpose of the temporary phase is usually to analyse the shape and function characteristics of the future final prosthesis and thus determine the effectiveness of the treatment plan. (2)
Currently, the materials most commonly used to make temporary restorations are acrylic resins and composite resins. (3, 4) The latter offer better mechanical characteristics in terms of flexural strength and hardness. (4)
There are several temporary restoration fabrication techniques, which can be direct, indirect and mixed. (5)
These include:
We will now focus on the pre-tooth preparation direct-indirect technique (5-8).
With the pre-tooth preparation technique, the temporary restoration is fabricated by a dental technician in a laboratory before the dentist prepares the tooth on which it is to be fitted.
This method has several advantages. Firstly, after the tooth preparation phase no further appointments are required, resulting in considerable time saving for both the dentist and the patient.
In addition, the temporary restoration will usually be relined in the patient’s mouth, so the amount of resin used will be limited, the exothermic reaction will be contained and free monomer dispersion will be reduced.
However, this technique has the disadvantage of requiring a preliminary impression phase before the preparation phase, in order to allow the dental technician to fabricate the model and the temporary restoration.
We will now take a closer look at this technique, taking all the clinical and laboratory steps one by one.
Acrytemp is the Zhermack solution for temporary restorations: it is a self-curing bis-acrylic resin suitable for short- and long-term temporary restorations, with high failure resistance. It is available in 50 ml cartridges in shades A1, A2, A3, A3.5 and B1.
References
1) The Glossary of Prosthodontic Terms: Ninth Edition. J Prosthet Dent. 2017 May;117(5S):e1-e105. doi: 10.1016/j.prosdent.2016.12.001. PMID: 28418832;
2) Shillingburg H, Sather D, Wilson E, Cain J, Mitchell D, Blanco L, Kessler J. Fondamenti di protesi fissa. 2014;
3) Tom, T. Nigel, et al. Provisional restorations: An overview of materials used. Journal of Advanced Clinical and Research Insights, 2016; 3.6: 212-214;
4) Astudillo-Rubio D, et al. Mechanical properties of provisional dental materials: A systematic review and meta-analysis. PloS one, 2018; 13.2: e0193162;
5) Regish, K. M., Sharma, D., & Prithviraj, D. R. (2011). Techniques of fabrication of provisional restoration: an overview. International journal of dentistry, 2011.
6) H. B. Dumbrigue, “Composite indirect-direct method for fabricating multiple-unit provisional restorations,” Journal of Prosthetic Dentistry, vol. 89, no. 1, pp. 86–88, 2003.
7) K. G. Boberick and T. K. Bachstein, “1998 Judson C. Hickey Scientific Writing Award. Use of a flexible cast for the indirect fabrication of provisional restorations,” The Journal of Prosthetic Dentistry, vol. 82, no. 1, pp. 90–93, 1999.
8) V. Bennani, “Fabrication of an indirect-direct provisional fixed partial denture,” Journal of Prosthetic Dentistry, vol. 84, no. 3, pp. 364–365, 2000.
Article from https://magazine.zhermack.com/en/laboratory-en/direct-indirect-pre-tooth-preparation-temporary-restoration-technique/
Courtesy of Dr. Alessandro Barbaglia