Objective:The purpose of this study was to compare the accuracy of two working cast fabrication techniques using strain- gauge analysis.Methods:Two working cast fabrication methods were evaluated. Based on a master model, 20 working casts were fabricated by means of an indirect impression technique using polyether after splinting the square transfer copings with acrylic resin. Specimens were assigned to 2 groups (n=10): Group A (GA): type IV dental stone was poured around the abutment analogs in the conventional way; Group B (GB), the dental stone was poured in two stages. Spacers were used over the abutment analogs (rubber tubes) and type IV dental stone was poured around the abutment analogs in the conventional way. After the stone had hardened completely, the spacers were removed and more stone was inserted in the spaces created. Six strain-gauges (Excel Ltd.), positioned in a cast bar, which was dimensionally accurate (perfect fit) to the master model, recorded the microstrains generated by each specimen. Data were analyzed statistically by the variance analysis (ANOVA) and Tukey's test (α= 5%).Results:The microstrain values (με) were (mean±SD): GA: 263.7±109.07με, and GB: 193.73±78.83με.Conclusion:There was no statistical difference between the two methods studied.
El protocolo de carga convencional iniciada por Brånermark en dos fases quirúrgicas ha sido evaluado durante los últimos 30 años bajo todas las condiciones clínicas posibles. Este tratamiento ha resuelto problemas relacionados a la retención y estabilidad de prótesis totales removibles convencionales, que perjudican función, la estética, la salud psicológica y las relaciones sociales de sus usuarios. Sin embargo, estas rehabilitaciones normalmente involucran tratamientos largos, con dos intervenciones quirúrgicas y varios ajustes de la prótesis provisional,siendo repetitivo para el profesional y el paciente. En comparación, la carga inmediata es un protocolo relativamente nuevo que necesita de una estricta evaluación clínica. El protocolo de carga inmediata sobre implantes es una de las opciones preferidas por los pacientes, puesconsiste en la colocación de los implantes e inmediata instalación de la prótesis total fija, siendo mas rápida y menos traumática. Sin embargo, el éxito de la carga inmediata depende de algunos pre-requisitos importantes las condiciones del paciente, así como la destreza y el conocimiento técnico del implantologo y el rehabilitador oral. Este trabajo describe el éxito de un caso clínico de protocolo con carga inmediata sobre implantes, en que sea relatado los procedimientos clínicos y de laboratorio con un seguimiento durante 12 meses. Debido a sus ventajas, creemosque esta puede ser una técnica utilizada y previsible cuando bien indicada y ejecutada.
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