Artículos de revistas
Strain Gauges's Analysis On Implant-retained Prosthesis' Cast Accuracy
Registro en:
Indian Journal Of Dental Research. Medknow Publications, v. 25, n. 5, p. 635 - 640, 2014.
9709290
10.4103/0970-9290.147113
2-s2.0-84920182871
Autor
Rodrigues M.A.
Luthi L.F.
Takahashi J.M.F.K.
Nobilo M.A.A.
Henriques G.E.P.
Institución
Resumen
Introduction: A proper cast is essential for a successful rehabilitation with implant prostheses, in order to produce better structures and induce less strain on the implants.Aims: The aim of this study was to evaluate the precision of four different mold filling techniques and verify an accurate methodology to evaluate these techniques.Materials and Methods: A total of 40 casts were obtained from a metallic matrix simulating three unit implant-retained prostheses. The molds were filled using four different techniques in four groups (n = 10): Group 1 - Single-portion filling technique; Group 2 - Two-step filling technique; Group 3 - Latex cylinder technique; Group 4 - Joining the implant analogs previously to the mold filling. A titanium framework was obtained and used as a reference to evaluate the marginal misfit and tension forces in each cast. Vertical misfit was measured with an optical microscope with an increase of 120 times following the single-screw test protocol. Strain was quantified using strain gauges. Data were analyzed using one-way ANOVA (Tukey's test) (α =0.05). The correlation between strain and vertical misfit was evaluated by Pearson test.Results: The misfit values did not present statistical difference (P = 0.979), while the strain results showed statistical difference between Groups 3 and 4 (P = 0.027).Conclusions: The splinting technique was considered to be as efficient as the conventional technique. The strain gauge methodology was accurate for strain measurements and cast distortion evaluation. There was no correlation between strain and marginal misfit. 25 5 635 640 Jemt, T., Lekholm, U., Measurements of bone and frame-work deformations induced by misfit of implant superstructures (1998) A Pilot Study in Rabbits. Clin Oral Implants Res, 9, pp. 272-280 Del'acqua, M.A., Arioli-Filho, J.N., Compagnoni, M.A., Mollo Fde, A., Jr., Accuracy of impression and pouring techniques for an implant-supported prosthesis (2008) Int J Oral Maxillofac Implants, 23, pp. 226-236 Carr, A., Sokol, J., Accuracy of casts produced by the Nobelpharma impression techniques (1991) J Dent Res, 70, p. 290 Cheshire, P., Hobkirk, J., An in vivo quantitative analysis of the fit of Nobel Biocare implant superstructures (1991) Int J Oral Maxillofac Implants, 6, pp. 448-455 Wise, M., Fit of implant-supported fixed prostheses fabricated on master casts made from a dental stone and a dental plaster (2001) J Prosthet Dent, 86, pp. 532-538 Watanabe, I., Topham, D.S., Laser welding of cast titanium and dental alloys using argon shielding (2006) J Prosthodont, 15, pp. 102-107 Sartori, I.A., Ribeiro, R.F., Francischone, C.E., De Mattos Mda, G., In vitro comparative analysis of the fit of gold alloy or commercially pure titanium implant-supported prostheses before and after electroerosion (2004) J Prosthet Dent, 92, pp. 132-138 Jemt, T., Failures and complications in 391 consecutively inserted fixed prostheses supported by Branemark implants in edentulous jaws: A study of treatment from the time of prosthesis placement to the first annual checkup (1991) Int J Oral Maxillofac Implants, 6, pp. 270-276 Kan, J.Y., Rungcharassaeng, K., Bohsali, K., Goodacre, C.J., Lang, B.R., Clinical methods for evaluating implant framework fit (1999) J Prosthet Dent, 81, pp. 7-13 Naconecy, M.M., Teixeira, E.R., Shinkai, R.S., Frasca, L.C., Cervieri, A., Evaluation of the accuracy of 3 transfer techniques for implant-supported prostheses with multiple abutments (2004) Int J Oral Maxillofac Implants, 19, pp. 192-198 Koke, U., Wolf, A., Lenz, P., Gilde, H., In vitro investigation of marginal accuracy of implant-supported screw-retained partial dentures (2004) J Oral Rehabil, 31, pp. 477-482 Jemt, T., Lie, A., Accuracy of implant-supported prostheses in the edentulous jaw: Analysis of precision of fit between cast gold-alloy frameworks and master casts by means of a three-dimensional photogrammetric technique (1995) Clin Oral Implants Res, 6, pp. 172-180 Rodrigues, M.A., Luthi, L.F., Henriques, G.E., The influence of master cast technique on the cast precision of implant-retained fixed prostheses (2012) Gen Dent, 60, pp. 122-178 Castilho, A.A., Kojima, A.N., Pereira, S.M., De Vasconcellos, D.K., Itinoche, M.K., Faria, R., In vitro evaluation of the precision of working casts for implant-supported restoration with multiple abutments (2007) J Appl Oral Sci, 15, pp. 241-246 Carr, A.B., Comparison of impression techniques for a two-implant 15-degree divergent model (1992) Int J Oral Maxillofac Implants, 7, pp. 468-475 Heshmati, R.H., Nagy, W.W., Wirth, C.G., Dhuru, V.B., Delayed linear expansion of improved dental stone (2002) J Prosthet Dent, 88, pp. 26-31 Wee, A.G., Cheng, A.C., Eskridge, R.N., Accuracy of 3 conceptually different die systems used for implant casts (2002) J Prosthet Dent, 87, pp. 23-29 McCartney, J.W., Pearson, R., Segmental framework matrix: Master cast verification, corrected cast guide, and analog transfer template for implant-supported prostheses (1994) J Prosthet Dent, 71, pp. 197-200 Shiau, J.C., Chen, L.L., Wu, C.T., An accurate impression method for implant prosthesis fabrication (1994) J Prosthet Dent, 72, pp. 23-25 Hsu, C.C., Millstein, P.L., Stein, R.S., A comparative analysis of the accuracy of implant transfer techniques (1993) J Prosthet Dent, 69, pp. 588-593 Vigolo, P., Fonzi, F., Majzoub, Z., Cordioli, G., An evaluation of impression techniques for multiple internal connection implant prostheses (2004) J Prosthet Dent, 92, pp. 470-476 Glantz, P.O., Rangert, B., Svensson, A., Stafford, G.D., Arnvidarson, B., Randow, K., On clinical loading of osseointegrated implants. A methodological and clinical study (1993) Clin Oral Implants Res, 4, pp. 99-105 Watanabe, F., Uno, I., Hata, Y., Neuendorff, G., Kirsch, A., Analysis of stress distribution in a screw-retained implant prosthesis (2000) Int J Oral Maxillofac Implants, 15, pp. 209-218 Assunção, W.G., Barão, V.A., Tabata, L.F., Gomes, E.A., Delben, J.A., Dos Santos PH. Biomechanics studies in dentistry: Bioengineering applied in oral implantology (2009) J Craniofac Surg, 20, pp. 1173-1177 Clelland, N.L., Papazoglou, E., Carr, A.B., Gilat, A., Comparison of strains transferred to a bone simulant among implant overdenture bars with various levels of misfit (1995) J Prosthodont, 4, pp. 243-250 Millington, N.D., Leung, T., Inaccurate fit of implant superstructures. Part 1: Stresses generated on the superstructure relative to the size of fit discrepancy (1995) Int J Prosthodont, 8, pp. 511-516 Nissan, J., Gross, M., Shifman, A., Assif, D., Stress levels for well-fitting implant superstructures as a function of tightening force levels, tightening sequence, and different operators (2001) J Prosthet Dent, 86, pp. 20-23