الفهرس | Only 14 pages are availabe for public view |
Abstract One of the fundamental elements of fixed prosthodontics is conservatism, which aims to preserve the tooth’s root structure and lengthen its lifespan. Restoration of severely damaged teeth that have undergone endodontic treatment continues to be a clinical issue. By exploiting the pulp chamber walls’ macro-retentive support and the micromechanical retention produced by adhesive cementation, the Endocrown method is completed without the use of a post application. This clinical study compared two designs of lithium disilicate endodontic crown restorations with intra-radicular extension to standard endodontic crown restorations without extension in order to assess clinical performance (in terms of marginal adaptation, fracture, retention, and soft tissue response). For molar teeth, 26 endocrowns were created. According to the preparation plans, the patients were split into two groups. (Design for intra-radicular extension) Group1 and Group2 (conventional no extension design). The first restorations were made of PMMA resin (mammoth PMMA resin), and the final restorations were made of lithium disilicate (Ivoclar-Vivadent, Schann, Liechtenstein). The Cad/Cam (ceramill motion 2) machine and software were used to fabricate the endocrowns (Exocad). Sandblasting and a silane coupling agent (Bisco) were used to prepare the repair surfaces, and self-adhesive resin cement was used for cementation (visalys cem, kettenbach). Both groups’ soft tissue responses, fractures, and retention were assessed using modified United States Public Health Services (USPHS) standards. All quantitative variables are put to the test for normality using the Shapiro-Wilk test before the proper parametric and non-parametric tests are selected. When comparing the means of two groups for variables that are discovered to have a normally distributed distribution, an independent samples t parametric test is used. Kruskal-Wallis is used for non-normally distributed variables. When comparing many groups, nonparametric tests are employed, whereas Mann-Whitney nonparametric tests are used when comparing just two groups. To examine the impact of groups and position as main factors and their interaction on internal gap, a two-way General Linear Model (GLM) ANOVA is used. Internal gap variables are typically not normally distributed, therefore non parametric testing are applicable. The marginal gap of both groups may be considered to be normally distributed, so parametric tests are used. The Mean, Standard Deviation (SD), Range (Minimum - Maximum), Standard Error (SE), 95% confidence interval of the mean, Median, and Inter-quartile range are used to characterise quantitative values (IQR). Frequencies and percentages are used to describe qualitative category variables. For comparing two groups, the Fisher exact probability test is used. The threshold for significance was chosen at P 0.01. Statistical analysis was done using IBM SPSS Statistics for Windows, Version 23.0. IBM Corp., New York, Armonk According to the results of our investigation, there was no statistically significant difference between the two groups in terms of soft tissue reaction, marginal adaption, |