Assessment of Intra-Oral Repair Systems for Veneered Zirconia and Zirconia Only

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

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

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

Knowledge and awareness of Turkish population about dental treatment during COVID-19-A questionnaire based survey

Introduction: SARS-CoV-2, also known as Coronavirus (COVID-19), is a zoonotic virus, which can spread from animals to humans, such as SARS-CoV and the Middle East Respiratory Syndrome (MERS-CoV) virus. The first case was reported on 31 December 2019 by the WHO Country Office in China. Aim: This study aimed to assess the knowledge and apprehension of the Turkish population about dental treatments during SARS-CoV-2. Materials and Methods: A cross-sectional questionnaire-based survey was conducted which consisted of 8 self-prepared questions with two parts. A total of 560 participants, participated in this study. Participants was selected randomly and chi-square analysis was used to analyse statistical significance difference in the response between different groups. Results: Most of the participants (80.9%) thought that their level of knowledge about coronavirus (COVID-19) was sufficient. More than half of the participants (57.2%) evaluated themselves in the risk group in the COVID-19 pandemic. A few of the participants (16.4%) had dental problems during pandemic and apart from that while 53.3% of the participants think that it is not risky to have treatment with vibrating tools used in dentistry; 47.6% of the participants do not prefer to go to dentist even if they had an abscess. Conclusion: The majority of the participants thought that they were knowledgeable enough about the risks of dental treatments in the pandemic period. However, the results have shown us that further steps need to be taken to educate people about the risks of dental treatments and the necessary situations that they have to go to the dentist during this period.Istanbul Medipol University, School of dentistr