Questions and Answers
What is the mean difference between Group A and Group B?
Which group has the highest mean value?
What is the significance of * in the LSD Multiple Comparisons table?
How many groups are compared in the LSD Multiple Comparisons table?
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What is the mean of all the groups combined?
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What is the error std in the LSD Multiple Comparisons table?
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How many samples are in Group A?
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What is the mean difference between Group B and Group C?
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What is the significance of the comparison between Group A and Group C?
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How many times is the significance level 0.007 in the LSD Multiple Comparisons table?
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Study Notes
Study Design
- 45 human maxillary premolars were used, with normal occlusal anatomy, comparable crown dimensions, and no attrition.
- Teeth were visually inspected with blue light transillumination to ensure enamel was free of cracks.
- Three experimental groups were randomly assigned to receive direct composite veneers using different materials.
Materials and Preparation
- Group A: Nano composite (Z350 XT, 3M, USA).
- Group B: Flowable composite (G-aenial Universal flo, GC, Japan).
- Group C: Nanohybrid Composite (G-aenial GC, Japan).
- Uniform preparations (partial wrap) were made for all teeth using veneer system preparation burs (Komet, Germany).
- The cervical third of the face shrunk by 0.4 mm and 0.5 mm, respectively, compared to the middle and occlusal thirds.
Fracture Resistance Test
- The test was used to measure the fracture strength of the veneers.
- The mean fracture load for Group C (restored with nanohybrid composite) was the greatest.
- This was associated with the increased mechanical qualities of the nanohybrid composite, with high filler weight and volume percentages (76% and 72%, respectively).
Previous Studies
- Studies have shown that laminate veneers with cuspal reduction have improved mechanical performance (lower stress concentration).
- The use of nano- and micro-hybrid particles may be a factor in increased fracture resistance.
- Previous studies have also investigated the fracture strength of direct and indirect laminates with and without fiber application.
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Description
A study comparing different materials used for direct composite veneers in human maxillary premolars. The teeth were prepared and randomly assigned to receive veneers using nano composite or flowable composite materials.
