Fracture resistance of root canal-treated molars restored with ceramic overlays with/without different resin composite base materials: an in vitro study

Haridy, Mohamed Fouad; Ahmed, Hend; Kataia, Mohamed M.; Saber, Shehabeldin Mohamed; Schäfer, Edgar

doi:10.1007/s10266-021-00682-5

Cited by 14 publications

(15 citation statements)

References 43 publications

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“…We also consider coronal access modification with minimally invasive approaches to avoid fatigue failure of NiTi files. Access designs should be executed with a precise balance that provides convenience for safe instrumentation on one side and the other side preserves an adequate amount of tooth structure, which is essential for post-treatment restorability and long-term serviceability of the endodontically treated tooth ( 30 ).…”

Section: Discussionmentioning

confidence: 99%

Impact of Angle of File Access and Location of Canal Curvature on the Dynamic Cyclic Fatigue of Nickel Titanium Rotary Instruments

ASSAF

2024

Eur Endod J

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Objective To evaluate the impact of different file access angles and root canal curvature’s location on the fatigue failure of One Curve (OC) and E3 Azure (EZ) NiTi files using a dynamic model at simulated body temperature. Methods Eighty new instruments with similar tip sizes and taper (#25/0.06) from two NiTi rotary systems, One Curve and E3 Azure, were tested at simulated body temperatures (37°C) using a custom-made dynamic cyclic fatigue device. Instruments were divided into four subgroups according to the location of root canal curvature (a coronal curve 5 mm from the root canal orifice and an apical curve 10 mm from the root canal orifice) and the angle of file access (0° or 30°). Instruments were operated in simulated stainless-steel canals having a 60° curve and a 3 mm radius. A custom-made device produced controlled vertical pecks during file rotation. Time to failure (sec) was registered, and the length of the fragment segments was measured (mm). Data were analysed statistically with One-Way ANOVA and Tukey post hoc tests. The significance level was set at 5%. All separated instruments were examined by scanning electron microscope. Results One-way ANOVA (p<0.05) found a significant difference among the tested instruments. Post Hoc analysis revealed lower cyclic fatigue resistance when the angle of file access was 30º, and the root canal curvature was located coronally for both files (p<0.0001). Three-way ANOVA showed that the angle of file access was the most influential contributor to cyclic fatigue, followed by the location of file curvature and, finally, the file type (p<0.0001). The fractographic examination revealed a predominantly ductile fracture mode for all tested instruments. The lengths of all fractured segments showed no significant difference (p>0.05), indicating an accurate trajectory during testing. Conclusion OC files had superior cyclic fatigue resistance than EZ files; coronal curvatures negatively impacted cyclic fatigue resistance compared to apical curvatures, while the angle of file access presented the highest impact on dynamic cyclic fatigue.

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Section: Discussionmentioning

confidence: 99%

Impact of Angle of File Access and Location of Canal Curvature on the Dynamic Cyclic Fatigue of Nickel Titanium Rotary Instruments

ASSAF

2024

Eur Endod J

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“…All preparation was adjusted to be in enamel, with the exception of the proximal and inlay boxes, which were adjusted in dentin 3,31 . In order to make the preparation standardized, depth grooves (0.5 mm) were first marked, and the preparation was then checked by putty index that was taken prior to preparation 32 . The thickness and dimensions of all restorations were then standardized using computer‐aided design and computer‐aided manufacturing (CAD‐CAM) software.…”

Section: Methodsmentioning

confidence: 99%

Influence of retainer design and number of inlay boxes on the biomechanical behavior of zirconia cantilever resin bonded fixed dental prosthesis

Kasem,

Abo‐Madina,

Al‐Zordk

2023

J Esthet Restor Dent

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ObjectivesThe development of dental adhesives with enhanced bond strength has assisted minimally invasive dentistry. The aim of this study was to evaluate the fracture load and stress distribution pattern of two retainer designs for posterior cantilever resin bonded fixed dental protheses (RBFDPs).Materials and MethodsForty human mandibular molars were divided into two groups according to the retainer design; lingual coverage (LC) and occlusal coverage (OC) retainers. Each main group was then divided according to the number of inlay boxes (n = 10); one inlay and two inlay boxes. High translucency (3Y) zirconia was used to manufacture all restorations, and a dual‐polymerizing adhesive resin cement was used for bonding. All specimens underwent 10,000 cycles of thermocycling (5–55°C), 240,000 cycles of dynamic loading (50 N, descending speed v = 30 mm/second, frequency = 1.6 Hz), and failure load test. Both one‐way and two‐way ANOVA tests were used to analyze the data. The four models included in the in‐vitro study are part of the finite element analysis (FEA). When the restorations failed, maximal principal stress values on restorations, enamel, dentin, and luting resin were investigated.ResultsA statistically significant (p = 0.018) higher failure load was recorded for OC1 (627.00 ± 153.4 N) than the other groups; (548.0 ± 75.6 N, 521.20 ± 11.3 N, and 509.20 ± 14.9 N for LC1, LC2, and OC2, respectively). With regard to failure mode, one inlay box designs showed more favorable failure pattern than those of two inlay boxes. FEA showed higher stress magnitude transmitted to the tooth structure in models LC2 and OC2.ConclusionsLingual coverage and occlusal coverage retainers are promising designs capable to withstand the normal occlusal force for cantilever RBFDP in premolar area. The use of two inlay boxes decreased the fracture load of the two retainer designs and increased the stress transmitted to the tooth and resulted in high incidence of catastrophic failure.Clinical SignificanceMonolithic high translucent zirconia RBFDP could be considered as a viable treatment option to substitute missing posterior tooth, with improved esthetics and biocompatibility.

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“…To standardize the preparation, the depth grooves were first marked, and the teeth were prepared using a dental surveyor with a convergence angle of 60. The preparation dimensions were then checked using a putty index, which was taken before preparation [32].…”

Section: Teeth Preparation and Fabrication Of Restorationsmentioning

confidence: 99%

Cantilever resin-bonded fixed dental prosthesis to substitute a single premolar: Impact of retainer design and ceramic material after dynamic loading

et al. 2023

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To evaluate the influence of retainer design and ceramic materials on the durability of minimally invasive cantilever resin-bonded fixed dental prostheses (RBFDPs) after artificial aging. Methods: One hundred caries-free human mandibular molars were prepared as abutments for all-ceramic cantilevered fixed dental prostheses using the following retainer designs: One wing (OW), Two wings (TW), Inlay ring (IR), Lingual coverage (LC), and Occlusal coverage (OC). Two ceramic materials were used: monolithic high translucent zirconia(z) and zirconia-reinforced lithium disilicate (ZLS 2 ) (n=10). All restorations were adhesively bonded with resin cement. The thermocycling of the specimens were performed between 5°C and 55°C for 10,000 cycles and then exposed to 240.000 cycles of dynamic loading on a chewing simulator. All surviving specimens were loaded onto the pontic until failure using a universal testing machine. Results: The mean failure load ranged from 124.00 to 627.00 N for the zirconia groups and from 133.30 to 230.00 N for the ZLS 2 groups. Regarding the materials, a significantly higher failure load was recorded in the zirconia groups than in the ZLS 2 groups (P<0.001), except for OW (P=0.748). Regarding the retainer designs, a significant different failure load was recorded between the different designs except for IR and LC in the zirconia groups, IR and OC, OW and TW, and TW and LC in the ZLS 2 groups (P<0.001). Conclusions: Zirconia IR, LC, and OC can be used as cantilever RBFDP in the premolar region. The fracture resistance of the ZLS 2 design was below the normal bite force and should not be recommended as the first option.

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Fracture resistance of root canal-treated molars restored with ceramic overlays with/without different resin composite base materials: an in vitro study

Cited by 14 publications

References 43 publications

Impact of Angle of File Access and Location of Canal Curvature on the Dynamic Cyclic Fatigue of Nickel Titanium Rotary Instruments

Impact of Angle of File Access and Location of Canal Curvature on the Dynamic Cyclic Fatigue of Nickel Titanium Rotary Instruments

Influence of retainer design and number of inlay boxes on the biomechanical behavior of zirconia cantilever resin bonded fixed dental prosthesis

Cantilever resin-bonded fixed dental prosthesis to substitute a single premolar: Impact of retainer design and ceramic material after dynamic loading

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