Evaluation of the marginal accuracy of provisional restorations made of acrylic resins
Aim: To evaluate the marginal accuracy of provisional crowns made with acrylics resins and to identify the surface(s) with the highest marginal discrepancy. Methods: A direct technique was used to fabricate 96 provisional restorations with 8 materials: Dencrilay, Dencôrlay, Dencôr, Vipicor, Duralay, Resinlay Speed, Refine Bright and Alike (n=12). The provisional crowns were made on a prepared molar-shaped metal die with a vinyl polysiloxane impression as a matrix. Marginal discrepancy of provisional restorations was analyzed at buccal, lingual, mesial and distal surfaces of metal die finish line in a stereomicroscope lupe at 100X. The images obtained were transferred to the Corel Draw X7 program and the distances from the cervical margins of the specimen to the reference lines were measured vertically. Comparisons were made with 1-way analysis of variance and the Tukey test (p <0.05). Results: The Alike resin exhibited the lowest marginal discrepancy (0.018 mm) and was significantly different from the Dencôrlay (0.037 mm), Filter Bright (0.034 mm), Duralay (0.033 mm) and Vipicor (0.032) resins. The buccal surface showed the highest marginal discrepancy (0.040 mm) compared to those of other surfaces (distal 0.029mm, lingual 0.028mm and mesial 0.024mm). Conclusion: The marginal adaptation of all materials and surfaces tested in this study were within a clinical acceptable limit. The Alike resin showed the best performance compared to Dencôrlay, Refine Bright, Duralay, and Vipicor resins. The buccal surface showed the highest marginal discrepancy than those of the other tested surfaces.
Rakhshan V. Marginal integrity of provisional resin restoration materials: A review of the literature. Saudi J Dent Res. 2015 Jan; 6(1): 33-40. doi: 10.1016/j.sjdr.2014.03.002.
Nejatidanesh F, Lotfi HR, Savabi O. Marginal accuracy of interim restorations fabricated from four interim autopolymerizing resins. J Prosthet Dent. 2006 May;95(5):364-7.
Rastogi A, Kamble V. Comparative analysis of the clinical techniques used in evaluation of marginal accuracy of cast restoration using stereomicroscopy as gold standard. J Adv Prosthodont. 2011 Jun;3(2):69-75. doi: 10.4047/jap.2011.3.2.69.
Kim SH, Watts DC. Polymerization shrinkage-strain kinetics of temporary crown and bridge materials. Dent Mater. 2004 Jan;20(1):88-95.
Strassler HE. Fixed prosthodontics provisional materials: making the right selection. Compend Contin Educ Dent. 2013 Jan;34(1):22-4, 26; quiz 28, 30.
Strassler HE. In-office provisional restorative materials for fixed prosthodontics: part 1 – polymeric resin provisional materials. Inside Dent. 2009Apr;5(4):70-4.
Al Rifaiy MQ. Evaluation of vertical marginal adaptation of provisional crowns by digital microscope. Niger J Clin Pract. 2017 Dec;20(12):1610-1617. doi: 10.4103/1119-3077.196083.
Christensen GJ. Tooth preparation and pulp degeneration. J Am Dent Assoc. 1997 Mar;128(3):353-4.
Christensen GJ. The fastest and best provisional restorations. J Am Dent Assoc. 2003 May;134(5):637-9.
García-López DA, Rezende CEE, Hiramatsu DA, Nishida CL, Rubo JH. [Long-term dimensional stability of an acrylic resin for provisional crowns with different types of processing techniques]. Rev Odontol UNESP. 2013 May/Jun;42(3):196-203. doi: 10.1590/S1807-25772013000300009. Portuguese.
Tjan AH, Tjan AH, Grant BE. Marginal accuracy of temporary composite crowns. J Prosthet Dent. 1987 Oct;58(4):417-21.
Koumjian JH, Holmes JB. Marginal accuracy of provisional restorative materials. J Prosthet Dent. 1990 Jun;63(6):639-42.
Celik C, Gemalmaz D. Comparison of marginal integrity of ceramic and composite veneer restorations luted with two different resin agents: an in vitro study. Int J Prosthodont. 2002 Jan-Feb;15(1):59-64.
Alfredo Filho M, Vieira LCC, Baratieri LN. Ceramic inlays and onlays: clinical procedures for predictable results. J Esthet Restor Dent. 2003;15(6):338-51; discussion 352.
Ehrenberg D, Weiner S. Changes in marginal gap size of provisional resin crowns after occlusal loading and thermal cycling. J Prosthet Dent. 2000 Aug;84(2):139-48.
Ehrenberg D, Weiner GI, Weiner S. Long-term effects of storage and thermal cycling on the marginal adaptation of provisional resin crowns: a pilot study. J Prosthet Dent. 2006 Mar;95(3):230-6.
Balkenhol M, Knapp M, Ferger P, Heun U, Wöstmann B. Correlation between polymerization shrinkage and marginal fit of temporary crowns. Dent Mater. 2008 Nov;24(11):1575-84. doi: 10.1016/j.dental.2008.07.001.
Kim SH. The effect of monomer to powder ratio on polymerization shrinkage-strain kinetics of polymer-based provisional crown and fixed partial denture materials. J Korean Acad Prosthodont. 2007;45(6):735-42.
Dhillon MN, Kumar M, D'Souza DSJ. Effect of water temperature and duration of immersion on the marginal accuracy of provisional crowns. Med J Armed Forces India. 2011 Jul;67(3):237-40. doi: 10.1016/S0377-1237(11)60049-X.
Mei ML, So SYC, Li H, Chu CH. Effect of heat treatment on the physical properties of provisional crowns during polymerization: an in vitro study. Materials (Basel). 2015 Apr 15;8(4):1766-1777. doi: 10.3390/ma8041766.
Roda MI, Cara AA, Capp CI, Camargo MA, Scanavini MA. [Marginal adaptation of laboratory, composite resin and porcelain restauration]. Odonto. 2007 Jan-Jun;15(29):73-80. doi: 10.15603/2176-1000/odonto.v15n29p73-80. Portuguese.
The Brazilian Journal of Oral Sciences uses the Creative Commons license (CC), thus preserving the integrity of the articles in an open access environment.