The results of the present study indicate that treatment with tissue-level implants is potentially more advantageous than with bone-level implants for implant-supported fixed prostheses.
Introduction: The curve of spee is very important in complete oral reconstructions and can be used as a reference for prosthetic and orthodontic reconstructions. This study assessed the curve of spee in the maxilla and mandible and its relationship with the overjet and overbite in class I, II, and III malocclusions in Iranian population. In this descriptive cross- sectional study, 75 pairs of dental casts with permanent dental system and having second molars, available in the clinic of Khorasgan Azad University and private orthodontic offices were selected and divided into three groups of 25 based on malocclusion I, II, and III.
Materials & Methods: In this descriptive cross- sectional study, 75 pairs of dental casts with permanent dental system and having second molars, available in the clinic of Khorasgan Azad University and private orthodontic offices were selected and divided into three groups of 25 based on malocclusion I, II and III. The radius and depth of curve of spee were obtained. Radius of the curve of spee, the tip of canine cusps, the mesiobuccal of the first molars, and the distobuccal cusps of the second molars were joined together in the form of an arch. To measure the depth of curve of spee, the reference plan was drawn from buccal canine cusp to distobuccal cusp of the second molars. The perpendicular lines were drawn from this line to the edge of the premolars cusp, the first molar and the second molar mesiobuccal cusp and the deepest part was regarded for the measurements. Overjet was measured as an average of 6 upper anterior teeth and overbite as an average of 4 anterior lower teeth and the values of radius and depth of horseshoe curvature and overbite and overjet values were analyzed by One-way ANOVA and Tukey test and Correlation between data was also examined by Pearson correlation coefficient test (p value = 0.05).
Results: In class II malocclusion, overbite values had a significant relationship with radius (p value = 0.02) and depth of the curve of spee (p value = 0.04), in class III malocclusion, overbite values had a significant relationship with the curve of spee (p value = 0.001) had. In class II malocclusion, the curve of spee was deeper and overbite values were higher, and also in the class III malocclusions, a direct relationship existed between the curve of spee and overbite
Conclusion: Curve of spee effects the values of overjet and overbite, and the presence of increased overbite results from a deep spee curvature.
Introduction: Marginal adaptation is one of the key factors in the success of dental crowns. It is necessary to identify marginal adaptation in order to determine the spacing and prevent the onset of diseases. This study sought to use 3D and manual printing methods aiming at manufacturing heat press full-coverage extra-coronal restorations with more marginal adaptation.
Materials & Methods: This study was conducted in the year 1397-98 at the Islamic Azad University of Isfahan using descriptive-analytical and cross-sectional method with 20 samples. Ten samples were evaluated using a 3D printing method, and ten samples were assessed by manual wax-up technique. Results were analyzed using Kruskal-Wallis and Mann-Whitney tests.
Results: There was a significant difference between the restoration space and the marginal edges in eight parts of the teeth in the manual method (p value < 0.001). The marginal edge space in the eight parts of the tooth was not significantly different in the 3D print method (p value = 0.614). A significant difference was observed in restoration space and the marginal edge between 3D printing and manual techniques (p value < 0.001).
Conclusion: The compatibility of the complete outer crowns of the heat press in the 3D printing method was not significantly different from the manual waxing method.
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