Core Build-Ups and Post Placement

Field, Claire; Stone, Simon; Whitworth, John; Wassell, Robert

doi:10.1007/978-3-319-79093-0_19

Cited by 2 publications

(5 citation statements)

References 52 publications

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“…Using RC, an effective bond between core and tooth are expected, however, only when moisture contamination and polymerization shrinkage can be properly controlled. 26,27 In short, when GIC was present, the lowest fracture load and the highest stress peaks were observed. However, according to the FEA the stress increases only 0.62% when GIC was used instead of RC for 0.5 mm restoration thickness, and 0.06% for 1.0 mm restoration thickness.…”

Section: Discussionmentioning

confidence: 95%

“…14 In addition, GIC is a water-based material, so while still needing moisture control, it is not as technique-sensitive as RC. 26 On the other hand, composites have excellent strength and can be used to make core build-ups both for vital and nonvital teeth. Using RC, an effective bond between core and tooth are expected, however, only when moisture contamination and polymerization shrinkage can be properly controlled.…”

Section: Discussionmentioning

confidence: 99%

“…23 The use of GIC to support lithium disilicate ceramic material has been previously reported. 24 25 Some dentists prefer GICs for core build-ups due to its apparent ease of placement, fluoride release, good adherence, coefficient of thermal expansion similar to dentin, 26 and reduced residual stress. 14 In addition, GIC is a water-based material, so while still needing moisture control, it is not as technique-sensitive as RC.…”

Section: Discussionmentioning

confidence: 99%

“…Using RC, an effective bond between core and tooth are expected, however, only when moisture contamination and polymerization shrinkage can be properly controlled. 26 27…”

Section: Discussionmentioning

confidence: 99%

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Substrate Rigidity Effect on CAD/CAM Restorations at Different Thicknesses

et al. 2022

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Objectives This article evaluated the effect of substrates rigidities on the post-fatigue fracture resistance of adhesively cemented simplified restorations in lithium disilicate glass ceramic. Methods Precrystalized computer-aided design/computer-aided manufacturing ceramic blocks were processed into disc-shaped specimens (n = 10, Ø = 10 mm), mimicking a simplified restoration at two thicknesses (0.5 and 1.0 mm). Thereafter, the discs were cemented onto different base substrates (dentin analogue [control], dentin analogue with a central core build-up of resin composite [RC], or glass ionomer cement [GIC]). The specimens were subjected to mechanical cycling in a chewing simulator (100 N, 1 × 106 cycles, 4 Hz) and then subjected to thermocycling aging (10,000 cycles, 5/37/55°C, 30 seconds). After the fatigue protocol, the specimens were loaded until failure (N) in a universal testing machine. Finite element analysis calculated the first principal stress at the center of the adhesive interface. Results The results showed that “restoration thickness,” “type of substrate,” and their interaction were statistically significant (one-way analysis of variance; p < 0.001). Regardless the restoration thickness a higher fracture load was observed for specimens cemented to dentin analogue. Among the base materials, RC build-up presented the highest fracture load and lower stress magnitude for both restoration thicknesses in comparison with GIC build-up. The 0.5-mm restoration showed higher stress peak and lower fracture load when submitted to the compressive test. Conclusion More flexible base material reduces the fracture load and increases the stress magnitude of adhesively cemented lithium disilicate restorations regardless the ceramic thickness. Therefore, more rigid substrates are suggested to be used to prevent restoration mechanical failures.

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Section: Discussionmentioning

confidence: 95%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

“…Using RC, an effective bond between core and tooth are expected, however, only when moisture contamination and polymerization shrinkage can be properly controlled. 26 27…”

Section: Discussionmentioning

confidence: 99%

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Substrate Rigidity Effect on CAD/CAM Restorations at Different Thicknesses

et al. 2022

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“…Preservation of the remaining tooth structure without the need to create retentive means in the preparation is considered a great advantage, moreover, these tooth-colored materials support the esthetic demands 4 . Posts are not always used for a fact 5 . Earlier, using posts was considered to strengthen root canal treated teeth and prevent their fracture.…”

Section: Introductionmentioning

confidence: 99%

Fracture resistance and 3D finite element analysis of machined ceramic crowns bonded to endodontically treated molars with two planes versus flat occlusal preparation designs: an in vitro study

2021

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Background: The flat occlusal preparation design (FOD) of posterior teeth offers promising results of fracture resistance and stress distribution, but its application in vital teeth is limited as there may be a danger of pulp injury. Although this danger is omitted in endodontically treated teeth, there is no research work assessing the impact of FOD on the fracture resistance and distribution of stresses among these teeth. The aim of this study was to assess the impact of FOD of endodontically treated molars on the fracture resistance and distribution of stresses among a ceramic crown-molar structure when compared to the two planes occlusal preparation design (TOD). Methods: 20 human mandibular molars were endodontically treated and distributed equally to two groups: Group I (TOD) and Group II (FOD). Ceramic CAD/CAM milled lithium disilicate (IPS e.max CAD) crowns were produced for all preparations and adhered using self-adhesive resin cement. Using a universal testing machine, the fracture resistance test was performed. The fractured samples were examined using a stereomicroscope and scanning electron microscope to determine modes of failure. Stress distribution was evaluated by 3D finite element analysis, which was performed on digital models of endodontically treated mandibular molars (one model for each design). Results: Group II recorded statistically non-significant higher fracture resistance mean values (3107.2± 604.9 N) than Group I mean values (2962.6 ±524.27 N) as indicated by Student’s t-test (t=0.55, p= 0.57). Also, Group II resulted in more favorable failure mode as compared to Group I. Both preparation designs yielded low von-Mises stresses within the factor of safety. However, the stress distribution among different layers of the model differed. Conclusions: FOD having comparable fracture strength to TOD and a more favorable fracture behavior can be used for the preparation of endodontically treated molars.

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Core Build-Ups and Post Placement

Cited by 2 publications

References 52 publications

Substrate Rigidity Effect on CAD/CAM Restorations at Different Thicknesses

Substrate Rigidity Effect on CAD/CAM Restorations at Different Thicknesses

Fracture resistance and 3D finite element analysis of machined ceramic crowns bonded to endodontically treated molars with two planes versus flat occlusal preparation designs: an in vitro study

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