2 research outputs found

    Assessment of intra-oral repair systems for veneered zirconia and zirconia only

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    The aim of this study was to compare bond strength resin composites to porcelain laminate veneers in the indirect repair method to composite resins used in the direct repair method for cases of porcelain veneer fracture of zirconia-based fixed dental prostheses. In the study, the groups were formed with different percentages of areas to be repaired to mimic porcelain fractures in the mouth. The experimental group of veneered zirconia were as follows: Group A = 100% Zr surface; Group B = 70% Zr, 30% porcelain surface; Group C = 50% Zr, 50% porcelain surface; Group D = 30% Zr, 70% porcelain surface; Group E = 100% porcelain surface. The repairs of the specimens were made using composite resin systems in half of the groups and using porcelain laminate veneers in the other half. Specimens were embedded in acrylic blocks before surface treatments and repairs were applied. After surface conditioning, laminate veneers were applied to the first half of the groups, and composite repair systems were applied to the second half of the groups. After all specimens were aged by thermal cycling, their bond strength values were measured using a Universal Testing Machine, and the obtained data were recorded. The specimens were examined with a stereomicroscope and classified according to failure types (adhesive/cohesive/mixed). Bond strength values were evaluated based on independent-samples t-test statistics. According to the comparisons among the groups, the bond strength of the indirect repairs made with the laminate material was higher than the bond strength of the repairs made with the composite. There was a statistically significant difference in favor of the indirect repair groups among all groups except for Group C. The highest bond strength was found in Group A in the indirect repair method, while the lowest bond was found in the direct repair method in Group E. Adhesive failure was mostly seen in the groups that were repaired with the composite

    Minimally invasive restoration of fractured maxillary central incisors with partial laminate veneers- a case series

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    Porcelain laminate veneers are one of the most preferred treatment methods today, due to the increasing interest in minimally invasive approach and their superior aesthetic properties. With the appreciation of the minimally invasive approach and the developing adhesive procedures, the partial laminate veneers have become more popular in dental field. In these case series, the teeth were restored with partial laminate veneers by only intervening in the fractured area. In this case series, the teeth that were restored with partial laminate veneers were prepared with different techniques. Preparation was performed without bevel in enamel margin in the case 1, with incisal overlap and bevel to create more natural transition on tooth surface in the case 2. In the case 3, preparation with incisal overlap was performed with preparation of the palatal surface of the tooth. The optical impression was made with the digital camera of the Chairside Economical Restoration of Esthetic Ceramic (CEREC) acquisition unit (Omnicam CEREC Sirona, Bensheim, Germany), in the first case. In the other cases, impression was taken with elastomeric impression materials. In addition, restorations were fabricated from feldspathic porcelain and lithium disilicate porcelain. In all the cases, restoration was cemented with resin cements. The following cases present the minimally invasive treatment of maxillary central incisors with a partial laminate veneers fabricated from different ceramic materials. New materials, procedures, and techniques provide patients an improved quality of life and a greater self-esteem with creating a confident aesthetic smile
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