الفهرس 
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Abstract
In order to evaluate the efficacy of three different design software programs on the margin and internal fit of developed fixed dental prostheses, preparations of three different span lengths with total occlusal convergence of 12° were made.
The models were divided into three groups according to type of the design software used: Exocad, 3Shape, and inLab; each group was then divided into three subgroups according to span length.
After the models were ready, the Medit T310 extraoral desktop Scanner was used to scan each model individually. ’Flexible Multi-die’ was selected as the scanner mode. Then, a solid mode was chosen. After that, a complete reconstruction model was created to align the scans. STL files were then exported to each design software separately.
The STL files were exported and submitted to the Geomagic software once the designs were finished. Prothesis abutment and prothesis intaglio files were imported in accordance with the triple scan technique as reference and measured data, respectively. To superimpose the prothesis intaglio file and master die file, the prothesis abutment file was used as the reference data. A best-fit alignment followed by a preliminary alignment was done.
The accurate fit of dental restorations is crucial for ensuring their long-term success and patient satisfaction. With the advancements in digital dentistry, different software options are available for designing dental restorations. This research aimed to investigate the influence of software and span length on the marginal and internal fit of dental restorations.
The study involved testing three different software options, namely InLab, 3Shape, and Exocad. Dental restorations with three different span lengths (Span 1, Span 2, and Span 3) were fabricated using each software. The marginal and internal fit of the restorations were measured and analyzed.
Results:
Marginal Fit: The interaction between software and span length had a significant effect on the marginal fit of the dental restorations. InLab consistently showed the highest marginal fit values across all span lengths tested. In contrast, Exocad consistently demonstrated the lowest marginal fit values. This suggests that InLab may be a more reliable choice for achieving accurate marginal fit in dental restorations.
Furthermore, for Span 3, InLab exhibited significantly higher marginal fit values compared to both 3Shape and Exocad. This indicates that InLab may be particularly effective when dealing with longer span lengths, offering improved marginal fit in such cases.
Internal Fit: The span length was found to have a significant effect on the internal fit of the dental restorations, whereas the software choice did not significantly impact internal fit values. Interestingly, Span 3 showed significantly higher internal fit values compared to both Span 1 and Span 2. This suggests that longer span lengths may be associated with better internal fit, regardless of the software used.
Correlation: A strong positive correlation was observed between marginal fit and internal fit. This implies that as the marginal fit improved, the internal fit also tended to improve. Therefore, achieving accurate marginal fit is crucial to ensuring favorable internal fit of dental restorations.
Dentists and dental technicians should consider these findings when selecting software and managing cases with different span lengths, aiming for optimal fit and clinical outcomes. Further research is warranted to explore additional variables and evaluate the long-term performance of the restorations produced with different software options.