Influence of different load application devices on fracture resistance of restored premolars

Silva, Gisele Rodrigues da; Silva, Natércia Rezende da; Soares, Paulo Vinícius; Costa, Ana Rosa; Fernandes-Neto, Alfredo Júlio; Soares, Carlos José

doi:10.1590/s0103-64402012000500003

Cited by 15 publications

(8 citation statements)

References 17 publications

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“…The bevel designs have been showed to improve the behaviors of restored teeth compared to teeth with non-beveled margin designes. 42,43 The significance of the cusp inclination and the loading zone 44,45 and the position of the residual tooth structure 31,34 have been described in in previous studies.…”

Section: Discussionmentioning

confidence: 89%

Effect of Preparation Design on Fracture Resistance and Failure Mode of Root Canal Treated Maxillary Premolars Restored with Onlay Restorations

Al-Zordk

2019

Egyptian Dental Journal

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Purpose: Cusp fractures are among the major reasons for the extractions of root-treated teeth. With the intention of increasing information about the mechanical behavior of minimally invasive cusp coverage restorations, the aim of current study was to evaluate the fracture resistance and failure modes of endodontically treated maxillary premolars restored with onlays employing various cusp reduction designs (anatomic, horizontal and beveled) to identify the optimum design and to assess whether these designs influence the restorable fracture rate. Materials and methods: Fifty defect-free maxillary premolar teeth were divided into 5 groups: onlay with anatomic occlusal reduction design (OA), onlay with horizontal occlusal reduction design (OH), onlay with beveled occlusal reduction design (OB), full-coverage crown (CR) and non-restored sound teeth (NR). In OA, OH, OB and CR groups, the access cavities were sealed using bonded composite after endodontic treatment. For OA, OH and OB groups, cusps were prepared with anatomic, horizontal and beveled designs. Except for NR group, all teeth were restored with resin-infiltrated ceramic restorations. After thermal aging for 10000 cycles between 5°C and 50 °C, all specimens were submitted to compressive axial load at a crosshead speed of 1 mm min-1 till failure. The data were analyzed using ANOVA test. Results: The highest load to fracture values (N) was recorded in control non-restored group (1657±167.7N), followed by CR, OA, OB and OH groups where the mean values were 887.5±40.3, 789.4±54.8, 722.2±46.2 and 634.8±74.2N respectively. Significant differences were found among fracture values of test groups (p<.05). The intact teeth predominantly fractured with favorable fracture patterns followed by CR group; while both OB and OH groups showed the heights nonfavorable pattern of fracture. Group OA represented moderate percentage of favorable fracture. Conclusions: Root treated teeth restored with anatomic cusp reduction design displayed greater fracture resistance and greater rates of restorable fractures than root treated teeth submitted to horizontal and beveled reduction deigns.

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Section: Discussionmentioning

confidence: 89%

Effect of Preparation Design on Fracture Resistance and Failure Mode of Root Canal Treated Maxillary Premolars Restored with Onlay Restorations

Al-Zordk

2019

Egyptian Dental Journal

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“…Another study also showed that the type of load application device significantly influences the behavior of the tooth-restoration complex during the mechanical fracture resistance test. 22 Another critical point to emphasize is that we measured dimensional and volumetric proportions and a low deviation was accepted when selecting samples. Teeth are biological structures with intrinsic morphological and compositional variability, which may influence the individual mechanical behavior of samples.…”

Section: Discussionmentioning

confidence: 99%

Influence of crosshead speed on failure load and failure mode of restored maxillary premolars

et al. 2016

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Abstract:We analyzed the effect of the crosshead speed of an applied load on failure load and failure mode of restored human premolars. Fifty intact, noncarious human premolars were selected. Class II mesio-occlusodistal preparations were made with a water-cooled high-speed preparation machine, and the teeth were restored with composite resin. The specimens were divided into five groups (n = 10 each) and tested individually in a mechanical testing machine, in which a 6.0-mm-diameter steel cylinder was mounted to vary the crosshead speed: v0.5: 0.5 mm/min; v1: 1.0 mm/min; v2.5: 2.5 mm/min; v5: 5.0 mm/min; and v10: 10.0 mm/min. The cylinder contacted the facial and lingual ridges beyond the margins of the restorations. Peak load to fracture was measured for each specimen (N). The means were calculated and analyzed with one-way analysis of variance followed by Tukey's test (a = 0.05). The mean load at failure values were (N) as follows: v0.5, 769. 4 ± 174.8; v1, 645.2 ± 115.7; v5, 614.3 ± 126.0; v2.5, 609.2 ± 208.1; and v10, 432.5 ± 136.9. The fracture modes were recorded on the basis of the degree of the tooth structural and restorative damage: (I) fracture of the restoration involving a small portion of the tooth; (II) fractures involving the coronal portion of the tooth with cohesive failure of the composite resin; (III) oblique tooth and restoration fracture with periodontal involvement; and (IV) vertical root and coronal fracture. Varying crosshead speeds of 0.5-5.0 mm/min did not influence the failure load of restored maxillary premolars; however, increasing the crosshead speed to 10 mm/min decreased the failure load values and the degree of tooth structural damage.

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“…A total of 64 sound maxillary first premolars (with two roots) were extracted for orthodontic treatment with comparable size. The teeth were collected and tested within three months (Javheri et al, 2012;Silva et al, 2012). The teeth stored in 0.1 vol % thymol for 2 days (Kikuti et al, 2012), and then in distal water at room temperature to avoid the dehydration of the specimens (Santos and Bezerra 2005;Abdo et al, 2012).…”

Section: Teeth Selectionmentioning

confidence: 99%

Fracture resistance of weakened premolars restored with different preheated bulk fill composites (A comparative in vitro study)

2018

Int. J. Biosci.

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Objective: This was performed to evaluate the preheating effect of different bulk fill composite materials on the fracture resistance of the maxillary premolars. A 64 caries & crack-free maxillary premolar teeth were divided into groups and subgroups with eight teeth each: group 1, sound unprepared teeth; group 2, teeth received (MOD) cavity and left unrestored; group 3-A, restored with Filtek TM bulk fill posterior restoration; group 3-B, restored with preheated Filtek TM bulk fill posterior restoration; group 4-A, restored with Beautifil -Bulk ™ composite; group 4-B, restored with preheated Beautifil -Bulk ™ composite; group 5-A, restored with Tertic Evo Ceram® Bulk Fill composite; and group 5-B, restored with preheated Tertic Evo Ceram® Bulk Fill composite.The teeth subjected to compression load with the long axis of the teeth until fractured using a universal testing machine. The data were statistically analyzed using one-way ANOVA, LSD test and t-test. The specimens in groups 3-5 were examined to evaluate the mode of failure. Group 1 showed the highest fracture resistance compared with other groups at room temperature and preheated composite materials. The differences among groups were statistically highly significant (P<0.01).Group 2 showed the lowest fracture resistance. Among the restored groups, group 4 recorded the highest fracture resistance than others, and statistically significant difference was found (P<0.05).No statistically significant differences were found (P<0.05) among the restored groups when preheated composite materials were used. No statistically differences were found (P<0.05) among the subgroups except group 5-A at room temperature and group 5-B at 54±1 °C.

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Influence of different load application devices on fracture resistance of restored premolars

Cited by 15 publications

References 17 publications

Effect of Preparation Design on Fracture Resistance and Failure Mode of Root Canal Treated Maxillary Premolars Restored with Onlay Restorations

Effect of Preparation Design on Fracture Resistance and Failure Mode of Root Canal Treated Maxillary Premolars Restored with Onlay Restorations

Influence of crosshead speed on failure load and failure mode of restored maxillary premolars

Fracture resistance of weakened premolars restored with different preheated bulk fill composites (A comparative in vitro study)

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