Stress distribution in molars restored with inlays or onlays with or without endodontic treatment: A three-dimensional finite element analysis

Jiang, Wenxin; Hui, Bo; YongChun, G.; Ni, Longxing

doi:10.1016/s0022-3913(09)60206-7

Cited by 123 publications

(116 citation statements)

References 26 publications

Supporting

Mentioning

102

Contrasting

Unclassified

Order By: Relevance

“…Thickness of zinc phosphate cement layer in restored molar tooth was estimated to be only about 0.03 mm 4) , and the Young's modulus of zinc phosphate cement was close to that of dentin 16) . Therefore, the cement layer between post and dentin and between core and crown was not included in all the 3D models representing the restored molar tooth 4,17) , since it was considered to have negligible adverse effect on interfacial stress.…”

Section: Materials Propertiesmentioning

confidence: 89%

A three-dimensional finite element analysis of the effects of restorative materials and post geometry on stress distribution in mandibular molar tooth restored with post-core crown

et al. 2012

View full text Add to dashboard Cite

Section: Materials Propertiesmentioning

confidence: 89%

A three-dimensional finite element analysis of the effects of restorative materials and post geometry on stress distribution in mandibular molar tooth restored with post-core crown

et al. 2012

View full text Add to dashboard Cite

“…Nevertheless, recent studies have demonstrated that during maximum intercuspidation within the second phase of chewing, higher stresses are more concentrated along the cervical dental portion and mesiolingual radicular area of the mandibular molars. Jiang et al [32] …”

Section: Discussionmentioning

confidence: 99%

Effects of fiber-glass-reinforced composite restorations on fracture resistance and failure mode of endodontically treated molars

Scotti

Forniglia

Tempesta

et al. 2016

Journal of Dentistry

View full text Add to dashboard Cite

A B S T R A C TObjectives: The study evaluated the fracture resistance and fracture patterns of endodontically treated mandibular first molars restored with glass-fiber-reinforced direct composite restorations. Methods: In total, 60 extracted intact first molars were treated endodontically; a mesio-occluso-distal (MOD) cavity was prepared and specimens were then divided into six groups: sound teeth (G1), no restoration (G2), direct composite restoration (G3), fiber-post-supported direct composite restoration (G4), direct composite reinforced with horizontal mesio-distal glass-fibers (G5), and buccal-palatal glassfibers (G6). Specimens were subjected to 5000 thermocycles and 20,000 cycles of 45 oblique loading force at 1.3 Hz and 50 N; they were then loaded until fracture. The maximum fracture loads were recorded in Newtons (N) and data were analyzed with one-way ANOVA and post-hoc Tukey tests (p < 0.05). Fractured specimens were analyzed with a scanning electron microscope (SEM). Results: The mean static loads (in Newtons) were: G1, 831.83; G2, 282.86; G3, 364.18; G4, 502.93; G5, 499.26; and G6, 582.22. Fracture resistance did not differ among G4, G5, and G6, but was significantly higher than G3 (p = 0.001). All specimens fractured in a catastrophic way. In G6, glass fibers inducted a partial deflection of the fracture, although they were not able to stop crack propagation. Conclusions: For the direct restoration of endodontically treated molars, reinforcement of composite resins with glass-fibers or fiber posts can enhance fracture resistance. The SEM analysis showed a low ability of horizontal glass-fibers to deviate the fracture, but this effect was not sufficient to lead to more favorable fracture patterns above the cement-enamel junction (CEJ). Clinical significance: The fracture resistance of endodontically treated molars restored with direct composite restorations seems to be increased by reinforcement with fibers, even if it is insufficient to restore sound molar fracture resistance and cannot avoid vertical fractures.

show abstract

“…10 Ceramic inlays, onlays, and endocrowns have been introduced as alternative restorations for endodontically treated molars, depending on the availability of remaining tooth structure. [11][12][13][14] Initially proposed by Pissis 15 in 1995, endocrowns are a type of restoration consisting of the entire core and crown as a single unit (ie, monoblock). Endocrowns use the available surface of the pulp chamber axial walls as macroretentive resources and adhesive resin cement as a means of micromechanical retention.…”

Section: Introductionmentioning

confidence: 99%

Fracture Resistance and Microleakage of Endocrowns Utilizing Three CAD-CAM Blocks

El-Damanhoury¹,

Haj-Ali²,

Platt³

2015

Operative Dentistry

174

169

View full text Add to dashboard Cite

Fracture resistance and mode of failure of CAD/CAM-fabricated monoblock endocrowns varies widely between materials. Clinicians should be cautious with material selection for endocrown restorations. SUMMARYThis study assessed marginal leakage and fracture resistance of computer-aided design/ computer-aided manufacturing (CAD/CAM) fabricated ceramic crowns with intracoronal extensions into the pulp chambers of endodontically treated teeth (endocrowns) using either feldspathic porcelain (CEREC Blocks [CB], Sirona Dental Systems GmbH, Bensheim, Germany), lithium disilicate (e.max [EX], Ivoclar Vivadent, Schaan, Liechtenstein), or resin nanoceramic (Lava Ultimate [LU], 3M ESPE, St Paul, MN, USA).). Thirty extracted human permanent maxillary molars were endodontically treated. Standardized preparations were done with 2-mm intracoronal extensions of the endocrowns into the pulp chamber. Teeth were divided into three groups (n=10); each group was restored with standardized CAD/CAM fabricated endocrowns using one of the three tested materials. After cementation with resin cement, specimens were stored in distilled water at 378C for one week, subjected to thermocycling, and immersed in a 5% methylene-blue dye solution for 24 hours. A compressive load was applied at 35 degrees to long axis of the teeth using a universal testing machine until failure. Failure load was recorded, and specimens were examined under a stereomicroscope for modes of failure and microleakage. Results were analyzed using one-way analysis of variance and Bonferroni post hoc multiple comparison tests (a=0.05). LU showed significantly (p,0.05) higher fracture resistance and more favorable fracture mode (ie, fracture of the endocrown without fracture of tooth) as well as higher dye penetration than CB and EX. In conclusion, although using resin

show abstract

Stress distribution in molars restored with inlays or onlays with or without endodontic treatment: A three-dimensional finite element analysis

Cited by 123 publications

References 26 publications

A three-dimensional finite element analysis of the effects of restorative materials and post geometry on stress distribution in mandibular molar tooth restored with post-core crown

A three-dimensional finite element analysis of the effects of restorative materials and post geometry on stress distribution in mandibular molar tooth restored with post-core crown

Effects of fiber-glass-reinforced composite restorations on fracture resistance and failure mode of endodontically treated molars

Fracture Resistance and Microleakage of Endocrowns Utilizing Three CAD-CAM Blocks

Contact Info

Product

Resources

About