Before the application of the adhesive protocol to one tooth buccal and lingual surfaces, the adjacent teeth are separated using teflon tape. After the curing of the matrix material, small openings are made in the middle of the incisal edge for the injection of the flowable resin composite ( Figure 1). The restorative concept included the construction of a clear polyvinyl siloxane matrix by replicating the diagnostic wax-up using a nonperforated tray. described the resin composite injection technique, which mainly focuses on the rehabilitation of the anterior teeth. (2) Use of a matrix for each tooth combined with a pre-heated composite was the most inaccurate technique, but the use of the clear tray in combination with the matrix improved the accuracy.Īdditional published concepts have been based on the idea of constructing direct composite veneers via matrices. Conclusions: (1) Use of one or two matrices and the injection of flowable composite were accurate techniques. Group 3 was different from the control in the incisal and middle third, and group 4 was different in the cervical third. Results: No statistically significant differences were found between groups 1 and 2 and the control. Kruskal-Wallis test and Dunn post-hoc test ( p < 0.05) were used to analyze the results.

Measurements were made at the incisal, middle and cervical third. Scans from the veneers were superimposed with the scans from the wax-up and compared using the Patient Monitoring software. Group 4: The same procedure as group 3, but the loaded matrix was placed first in the clear plastic tray, which was used for the matrix’s fabrication. Group 3: Transparent silicone matrices cut for each tooth and preheated resin composite. Group 2: The same procedure as group 1, but the first three teeth were restored using the matrix constructed from the ‘every other tooth’ wax-up model. Group 1: Transparent silicone matrices with holes for the injection of the flowable composite.

Materials and method: A total of 48 identical misaligned models, 12 wax-up models and one ‘every other tooth’ wax-up model were 3D printed. Purpose: To evaluate the discrepancy between the diagnostic wax-up and the resulting direct veneers using different matrices.

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