Fracture Strength and Fracture Patterns of Root-filled Teeth Restored With Direct Resin Composite Restorations Under Static and Fatigue Loading

2014 ◽  
Vol 39 (2) ◽  
pp. 181-188 ◽  
Author(s):  
NA Taha ◽  
JE Palamara ◽  
HH Messer
Keyword(s):  
Fracture Strength ◽  
Resin Composite ◽  
Glass Ionomer Cement ◽  
Fatigue Loading ◽  
Test System ◽  
Fracture Load ◽  
Composite Restorations ◽  
Fracture Patterns ◽  
Lower Load ◽  
Number Of Cycles

SUMMARY Aim To assess fracture strength and fracture patterns of root-filled teeth with direct resin composite restorations under static and fatigue loading. Methodology MOD cavities plus endodontic access were prepared in 48 premolars. Teeth were root filled and divided into three restorative groups, as follows 1) resin composite; 2) glass ionomer cement (GIC) core and resin composite; and 3) open laminate technique with GIC and resin composite. Teeth were loaded in a servohydraulic material test system. Eight samples in each group were subjected to stepped fatigue loading: a preconditioning load of 100 N (5000 cycles) followed by 30,000 cycles each at 200 N and higher loads in 50-N increments until fracture. Noncycled teeth were subjected to a ramped load. Fracture load, number of cycles, and fracture patterns were recorded. Data were analyzed using two-way analysis of variance and Bonferroni tests. Results Fatigue cycling reduced fracture strength significantly (p<0.001). Teeth restored with a GIC core and a laminate technique were significantly weaker than the composite group (379±56 N, 352±67 N vs 490±78 N, p=0.001). Initial debonding occurred before the tooth underwent fracture. All failures were predominantly adhesive, with subcrestal fracture of the buccal cusp. Conclusions Resin composite restorations had significantly higher fracture strength than did other restorations. Fatigue cycled teeth failed at lower load than did noncycled teeth.

scholarly journals Evaluation of Marginal/Internal Fit and Fracture Load of Monolithic Zirconia and Zirconia Lithium Silicate (ZLS) CAD/CAM Crown Systems

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6346
Author(s):  
Haneen A. Sadeqi ◽  
Mirza Rustum Baig ◽  
Mohammad Al-Shammari
Keyword(s):  
Fracture Strength ◽  
Fatigue Loading ◽  
Fracture Load ◽  
Lithium Silicate ◽  
Cad Cam ◽  
Monolithic Zirconia ◽  
Axial Compressive Strength ◽  
The Individual ◽  
Internal Fit ◽  
Mechanical Aging

Fit accuracy and fracture strength of milled monolithic zirconia (Zi) and zirconia-reinforced lithium silicate (ZLS) crowns are important parameters determining the success of these restorations. This study aimed to evaluate and compare the marginal and internal fit of monolithic Zi and ZLS crowns, along with the fracture load, with and without mechanical aging. Thirty-two stone dies acquired from a customized master metal molar die were scanned, and ceramic crowns (16 Zi Ceramill Zolid HT+ and 16 ZLS Vita Suprinity) were designed and milled. Absolute marginal discrepancies (AMD), marginal gaps (MG), and internal gaps (IG) of the crowns, in relation to the master metal die, were evaluated using x-ray nanotomography (n = 16). Next, thirty-two metal dies were fabricated based on the master metal die, and crowns (16 Zi; 16 ZLS) cemented and divided into four groups of eight each; eight Zi with mechanical aging (MA), eight Zi without mechanical aging (WMA), eight ZLS (MA), and eight ZLS (WMA). Two groups of crowns (Zi-MA; ZLS-MA) were subjected to 500,000 mechanical cycles (200 ± 50 N, 10 Hz) followed by axial compressive strength testing of all crowns, until failure, and the values were recorded. Independent sample t tests (α = 0.05) revealed no significant differences between Zi and ZLS crowns (p > 0.05); for both internal and marginal gaps, however, there were significant differences in AMD (p < 0.005). Independent samples Mann–Whitney U and Kruskal–Wallis tests revealed significant differences between the two materials, Zi and ZLS, regardless of fatigue loading, and for the individual material groups based on aging (α = 0.05). Multiple comparisons using Bonferroni post-hoc analysis showed significant differences between Zi and ZLS material groups, with or without aging. Within the limitations of this study, the ZLS crown fit was found to be on par with Zi, except for the AMD parameter. As regards fracture resistance, both materials survived the normal range of masticatory forces, but the Zi crowns demonstrated greater resistance to fracture. The monolithic Zi and ZLS crowns seem suitable for clinical application, based on the fit and fracture strength values obtained.

scholarly journals Fracture Behavior and Integrity of Different Direct Restorative Materials to Restore Noncarious Cervical Lesions

Polymers ◽  
2021 ◽  
Vol 13 (23) ◽  
pp. 4170
Author(s):  
Emese Battancs ◽  
Márk Fráter ◽  
Tekla Sáry ◽  
Emese Gál ◽  
Gábor Braunitzer ◽  
...  
Keyword(s):  
Fracture Resistance ◽  
Fracture Behavior ◽  
Resin Composite ◽  
Testing Machine ◽  
Glass Ionomer Cement ◽  
Fatigue Loading ◽  
Cervical Lesions ◽  
Loading Test ◽  
Restorative Materials ◽  
Static Loading Test

The purpose of this study was to analyze the fracture resistance and marginal leakage of noncarious cervical lesion (NCCL) restorations made of different restorative materials. Eighty upper premolars were randomly divided into four groups (n = 20/group). Standardized NCCL cavity preparations were performed on the buccal surface of the teeth and then restored with four different materials. Group 1: Packable resin composite (PC); Group 2: Highly flowable resin composite (HF); Group 3: Low flowable resin composite (LF); Group 4: Resin modified glass ionomer cement (RMGIC). After restorations were completed, cyclic and static fracture behavior was evaluated using a loading testing machine. Extra restored teeth were sectioned and then stained (n = 5/group). The specimens were viewed under a stereo microscope and the percentage of microgaps at the tooth–restoration interface was calculated. All restored teeth survived after fatigue loading. There was no statistically significant (p > 0.05) difference between the tested restorations after the static loading test. NCCLs restored with highly filled flowable composite showed the least microleakage among the tested groups (p < 0.05). The investigated restorative materials are acceptable for NCCL restorations in terms of fracture resistance and microleakage.

scholarly journals Effect of Load Cycling on the Fracture Strength/Mode of Teeth Restored with FRC Posts or a FRC Liner and a Resin Composite

2018 ◽  
Vol 2018 ◽  
pp. 1-10
Author(s):  
Maria D. Gaintantzopoulou ◽  
Eleftherios T. Farmakis ◽  
George C. Eliades
Keyword(s):  
Glass Fiber ◽  
Fracture Strength ◽  
Root Canal ◽  
Failure Modes ◽  
Resin Composite ◽  
Fracture Load ◽  
Load Cycling ◽  
Group A ◽  
Root Fractures ◽  
Group B

The aim of the study was to comparatively evaluate the fracture strength and mode of root canal treated teeth restored with resin composites with and without posts. The lingual cusps of root canal treated first upper premolars (n = 10/group) were removed down to cervical enamel and restored with the following: group A: glass-fiber post (Glassix) followed by a particulate-filled composite resin (PFC, G-aenial posterior, 3 × 2 mm layers); group B: glass-fiber reinforced composite bulk fill liner (EverX posterior, 4 mm layer) with the PFC (2 mm layer). Specimens were immersed in H2O (1 w/37°C), then subjected to load cycling (50 N/0.2 Hz/200k cycles), and fractured under compressive loading. Failure mode was characterized by stereomicroscopy. Statistical analysis was performed by Mann-Whitney (load) and Chi-square (mode) at a = 0.05. No statistically significant differences (p = 0.273) were found in fracture load between median values of groups A (860 N) and B (1059 N). In group A, 60% of the specimens demonstrated catastrophic root fractures and 40% mixed crown fractures (tooth cusp and restoration), whereas in group B, no root fractures were found, and the failure modes were equally distributed between mixed fractures as above and fracture of the buccal cusp. These differences were statistically significant (p = 0.004). The combination of the glass-FRC bulk fill liner with the PFC diminished the catastrophic root fractures induced by FRC posts, at a similar or higher fracture load.

Internal adaptation of resin composite restorations with different thicknesses of glass ionomer cement lining

2017 ◽  
Vol 9 (2) ◽  
pp. e12308 ◽  
Author(s):  
Ornjira Chailert ◽  
Danuchit Banomyong ◽  
Nataya Vongphan ◽  
Piyanart Ekworapoj ◽  
Michael F. Burrow
Keyword(s):  
Resin Composite ◽  
Glass Ionomer Cement ◽  
Glass Ionomer ◽  
Composite Restorations ◽  
Internal Adaptation ◽  
Ionomer Cement

Resistance of Bonded Composite Restorations to Fracture of Endodontically Treated Teeth

2004 ◽  
Vol 5 (3) ◽  
pp. 51-58 ◽  
Author(s):  
A.R. Daneshkazemi
Keyword(s):  
Composite Resin ◽  
Resin Composite ◽  
Glass Ionomer Cement ◽  
Bonding Agent ◽  
List Type ◽  
Endodontically Treated Teeth ◽  
Dentin Bonding ◽  
Composite Restorations ◽  
Significant Difference ◽  
Bonded Composite

Abstract The aim of this in vitro study was performed to evaluate the effect of dentin bonding agents and glass ionomer cement beneath composite restorations and its resistance to fracture of endodontically treated teeth. Fifty sound extracted maxillary teeth were selected; ten of them for controls and the remainder were modified with root canal treatment and a mesial occlusal distal (MOD) cavity preparation. The modified teeth were then divided into five groups: Sound teeth Prepared without restorations for control Prepared and restored with Vitrebond (3M, USA), Singlebond (3M, USA), and Z100 (3M, USA) resin composite Prepared and restored with Concise enamel bonding agent (3M, USA) and Z100 resin composite Prepared and restored using Singlebond and Z100 composite resin The modified specimens were subjected to compressive load by an Instron machine until fracture occurred. Group 1 showed the highest resistance to compressive force followed by Groups 5, 3, 4, and 2, respectively. Statistical analysis using analysis of variance (ANOVA) and a t-test indicated significant difference between all groups. Use of a dentin bonding agent and composite resin increased the resistance of endodontically treated teeth to fracture. Citation Daneshkazemi AR. Resistance of Bonded Composite Restorations to Fracture of Endodontically Treated Teeth. J Contemp Dent Pract 2004 August;(5)3:051-058.

Postoperative sensitivity associated with resin composite restorations

ORL ro ◽  
2018 ◽  
Vol 4 (41) ◽  
pp. 45
Author(s):  
Irina-Maria Gheorghiu ◽  
Loredana Mitran ◽  
Mihai Mitran ◽  
Anca-Nicoleta Temelcea ◽  
Sânziana Scărlătescu ◽  
...  
Keyword(s):  
Resin Composite ◽  
Composite Restorations ◽  
Postoperative Sensitivity
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