Search for: [Abstract = "Orthodontic extrusion allows for the reconstruction of the damaged tooth and preservation of its periodontium with all the benefits. While orthodontic crown lengthening is taking place, the clinical crown is improved, but a decrease in the crown to root ratio is observed.The aim of the study was to evaluate resistance of extruded andsubsequently prosthetically reconstructed teeth in a laboratory experimental model. Additional aim was to construct a diagnostic and therapeutic protocol for the orthodontic crown lengthening followed by prosthetic reconstruction.Study material consisted of 60 incisors divided into groups showing the most common clinical situations in which extrusion is needed before prosthetic reconstruction, and a diverse range of extrusion. The tested range of extrusion in groups was 0, 2, 4 and 6 mm. The control group was a group of healthy teeth. Specially designed for the purpose of research model consisted of laboratory samples which underwent endurance tests. The result of these tests was the force at which the destruction of the sample occurred \[kN\], displacement \[mm\] and the energy of destruction \[J\]. Comparisons in groups were made using analysis of variance \(ANOVA\) and differences in individual pairs of groups was assessed using a post hoc test Student\-Newman\-Keuls'a.Reduction of mean values of destructive forces in the control study groups was successiv"]

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