Abstract
Background: Treatment of patients with severe tooth wear is complex. Treatments involving more tooth structure removal may be inappropriate for patients who have already lost a significant amount of dental tissue due to erosion. The aim of this study was to evaluate the effect of two modified occlusal veneer preparations on the fatigue resistance and stress distribution of bonded occlusal veneers, in comparison to the conventional preparation design. Methods: A total of 54 human mandibular molars were distributed into three equal groups of n=18 teeth each, according to the occlusal veneer preparation design, where group I (conventional design) received Planar occlusal veneer preparation, group II (occlusal veneer with circumferential finish line) and group III (occlusal veneer with intracoronal cavity extension). For the manufacture of all the veneers using machinable zirconium lithium silicate glass ceramic blocks, a computer aided design/manufacturing system was used. A dual cure, adhesive resin cement was used to bond all occlusal veneers to corresponding prepared teeth. After storage in water for one week, step-stress (accelerated life testing was performed for all samples. Finite element analysis was carried out as well to evaluate the distribution of stresses. Results: The highest values (mean±SD) were recorded for group II (890.57±211.53 N) followed by Group I values (883.54±135.91 N), while the lowest values were recorded for Group III (875.57±143.52 N). The difference between groups was statistically non-significant as indicated by ANOVA (P=0.9814>0.05). The stress values were generally found to be low and their distribution differed among groups. Conclusion: Group I and II showed comparable fatigue resistance and more favourable failure behaviour when compared to Group III based on the fractographic and 3D finite element analyses.
Highlights
IntroductionMaximum sound tooth structure conservation is crucial for tooth restorations and durability[1]
Invasive dentistry has recently become an area of interest
Fatigue resistance It was discovered that the largest mean±standard deviation (SD) values were registered for Group II; (890.57± 211.53 N) followed by Group I mean±SD values; (883.54±135.91 N) whereas, the smallest mean±SD values were recorded for Group III (875.57±143.52 N)
Summary
Maximum sound tooth structure conservation is crucial for tooth restorations and durability[1]. This concept can be applied successfully with occlusal veneers (thin onlay/overlay with non-retentive design), which are posterior extra coronal Restorations needing less preparation guided by interocclusal space and teeth anatomy[2]. The evaluation of various preparation models showed that the amount of tooth structure removed in the posterior teeth for onlay and partial coverage preparation could be reduced by as much as 40% compared to full coverage preparation[2]. The aim of this study was to evaluate the effect of two modified occlusal veneer preparations on the fatigue resistance and stress distribution of bonded occlusal veneers, in comparison to the conventional preparation design. Conclusion: Group I and II showed comparable fatigue resistance and more favourable failure behaviour when compared to Group III based on the fractographic and 3D finite element analyses
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