Effect of Different Liners on Fracture Resistance of Premolars Restored with Conventional and Short Fiber‐Reinforced Composite Resins

Shafıei, Fereshteh; Doozandeh, Maryam; Ghaffaripour, Dordaneh

doi:10.1111/jopr.12743

Cited by 7 publications

(6 citation statements)

References 37 publications

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“…Yet, it was demonstrated that a flowable liner probably bonds and polymerizes simultaneously, leading to viscoelastic flow that reduces the negative effect of polymerization stress on the bonding. This property is advantageous in terms of marginal adaptation [ 56 ].…”

Section: Development Of Discussionmentioning

confidence: 99%

Overviews on the Progress of Flowable Dental Polymeric Composites: Their Composition, Polymerization Process, Flowability and Radiopacity Aspects

Vouvoudi

2022

Polymers

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A review article has been conducted including the main research results and comments referring to flowable dental polymeric materials. To begin with, the synthesis and composition of this category of composites is discussed, revealing the major components of the commercial products in terms of chemistry and proportion. Later, the polymerization characteristics are unfolded regarding the reaction time and rate, volumetric shrinkage and depth of cure for both photocurable and self-curable composites. To continue, some perspectives of the pre-treatment or accompanying processes that a clinician may follow to enhance the materials’ performance are described. Fluidity is certainly associated with the progress of polymerization and the in-depth conversion of monomers to a polymeric network. Last, the aspects of radiopacity and translucency are commented on, showing that all flowable polymeric composites satisfy the radiography rule, while the masking ability depends on the fillers’ properties and specimen thickness. The reviewing article is addressed to all field scientists and practitioners dealing with flowable dental composites studies or applications.

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Section: Development Of Discussionmentioning

confidence: 99%

Overviews on the Progress of Flowable Dental Polymeric Composites: Their Composition, Polymerization Process, Flowability and Radiopacity Aspects

Vouvoudi

2022

Polymers

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“…I.d) Fracture resistance test The specimens were subjected to thermoycling (1200 cycles) between 5°C and 55°C, with a dwell time of 30 seconds. Afterwards, all the specimens were subjected to load cycling of 240,000 cycles that simulates one year of clinical service in a custom made chewing simulator device prior to fracture resistance testing procedure (15). Axial compression was applied in a universal testing machine (5ST, Tinius Olsen, England) (Figure 1) using a 4-mm diameter metal ball with a crosshead speed of 0.5 mm/minute until fracture occurred.…”

Section: Methodsmentioning

confidence: 99%

Fracture Resistance of Maxillary Premolars With Complex Class Ii Cavities Restored With Recent Types of Posterior Composites and Biaxial Flexural Strength Assessment

Khaleel

Elkady

Motie

2022

Alexandria Dental Journal

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This study aimed to evaluate the fracture resistance of maxillary premolars with MOD cavities restored with recent composite types, and assess the biaxial flexural strength of those composites. MATERIALS AND METHODS: Sixty maxillary premolars were collected for fracture resistance (FR) evaluation of which ten were left intact (Group A).The remaining teeth received standardized MOD preparations. Forty teeth were divided into 4 subgroups (n=10) an``11```d restored with an assigned composite material; Subgroup B1 Filtek bulkfill posterior (3M ESPE). Subgroup B2 Ceram X Spheretec nanoceramic (Dentsply). Subgroup B3 Swisstec microhybrid (Coltene). Subgroup B4 Harmonize nanohybrid (Kerr). For group C, ten teeth were left unrestored after preparation. Fracture resistance test was done with the Universal Testing Machine (UTM) and failures were evaluated. For biaxial flexural strength (BFS) test, forty composite discs were divided into 4 groups, (n=10). Groups I, II, III and IV where discs made of (Filtek Bulkfill Posterior, 3MESPE), (Ceram X Spheretec, Dentsply), (Swisstec, Coltene) and (Harmonize, Kerr) respectively. Specimens were loaded till fracture using UTM. BFS was calculated and failures evaluated. RESULTS: FR values of Group A were the highest (1517.20), followed by Subgroup B2 (1179.00), Subgroup B4 (940.30), Subgroup B1 (813.70), Subgroup B3 (657.90) and Group C (559.50), with significant differences among the groups (p=0.001). BFS values were the highest in Group I (207.605) followed by Group III (165.241), Group IV (164.284) and Group II (151.221), with significant differences among the groups (p=0.001). CONCLUSION: FR of nanoceramic composite was significantly higher than all experimental groups, while microhybrid was the lowest with no significant difference with Group C. BFS of bulkfill composite was significantly higher than other groups, and that of nanocermic was the lowest. No direct correlation was found between FR and BFS of composite.

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“…Before to embedding the teeth in a cylinder of self-curing acrylic resin up to 1 mm below the cementoenamel junction (CEJ), their roots were covered with a 0.2-0.3-mm layer of melted wax. This layer was replaced with a polyether impression material to mimic the periodontal ligament (17). The long axis of the tooth was perpendicular to the base of the cylinder.…”

Section: Methodsmentioning

confidence: 99%

Effect of proanthocyanidin mediated immediate and delayed dentin sealing on the strength of premolars restored with composite resin inlay

Shafıei¹,

Aghaei²,

Jowkar³

2020

J Clin Exp Dent

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Background: Immediate dentin sealing (IDS) with proanthocyanidin (PA) could be used before cementation with a self-adhesive (SA) cement. The aim of this study was to assess the effect of PA treatment on acid-etched dentin before adhesive application, in IDS and delayed dentin sealing (DDS), on the strengthening property of SA-cemented composite resin inlay in premolars. Material and Methods: Eighty-four maxillary premolars were divided into 7 groups (n=12): 1) (Intact) Sound teeth served as controls; groups 2-7) After cavity preparation and fabrication of composite resin inlay, temporary inlays were made and cemented. After one week, the inlays were removed and composite inlays were luted with a self-adhesive resin cement as follows: 2) (SA) Without dentin-pretreatment; 3) (DDS) Etch-and-rinse adhesive before the cementation; 4) (DDS/PA) PA treatment of acid-etched dentin before the adhesive, followed by the cementation; 5) (Etch/PA) PA treatment of acid-etched dentin before the cementation; 6 and 7) (IDS and IDS/PA) Application of IDS without or with PA treatment, respectively, one week before the cementation. After thermo-mechanical aging, fracture resistance (FR) was tested. Data were analyzed using one-way ANOVA and Tamhane tests (α=0.05). Results: There was a significant difference between the study groups (P < 0.001). The IDS and IDS/PA groups yielded significantly higher FR compared to the SA group (P ≤ 0.003), but the DDS, DDS/PA and Etch/PA groups did not differ from the SA group (P > 0.05). The effect of PA on FR in the IDS and DDS techniques was not significant. Conclusions: IDS with or without PA treatment considerably improved the strength of premolars with self-adhesive-cemented inlay, while the value of only IDS with PA treatment reached the level of the sound teeth.

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Effect of Different Liners on Fracture Resistance of Premolars Restored with Conventional and Short Fiber‐Reinforced Composite Resins

Abstract: The four liners can be used without interfering with the higher efficacy of SFRC, compared to conventional composite resins, to improve the fracture strength of premolar MOD cavities.

Cited by 7 publications

References 37 publications

Overviews on the Progress of Flowable Dental Polymeric Composites: Their Composition, Polymerization Process, Flowability and Radiopacity Aspects

Overviews on the Progress of Flowable Dental Polymeric Composites: Their Composition, Polymerization Process, Flowability and Radiopacity Aspects

Fracture Resistance of Maxillary Premolars With Complex Class Ii Cavities Restored With Recent Types of Posterior Composites and Biaxial Flexural Strength Assessment

Effect of proanthocyanidin mediated immediate and delayed dentin sealing on the strength of premolars restored with composite resin inlay

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