Evaluation of the fracture resistance of premolars with extensive and medium cavity preparations restored with direct restoring systems

Pottmaier, L.F.; Linhares, Ludmilla de Azevedo; Vieira, Luiz Clóvis Cardoso

doi:10.4103/ijdr.ijdr_602_16

Cited by 7 publications

(5 citation statements)

References 1 publication

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“…Deep gingival floors of the proximal boxes which could act as a fulcrum for cusp bending in conjunction with decreased thickness might lead to lower fracture strength in extended preparations [ 30 ]. Another study by Pottemaier et al [ 31 ] showed that increasing the cavity width from 1/3 of the intercuspal distance to 2/3 did not decrease the fracture strength.…”

Section: Discussionmentioning

confidence: 99%

Fracture Strength and Marginal Adaptation of Conservative and Extended MOD Cavities Restored with Cention N

Firouzmandi

Alavi

Jafarpour

et al. 2021

International Journal of Dentistry

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The aim of the present study was to compare the fracture strength and marginal adaptation of MOD cavities restored with Cention N, bonded Cention N, and resin composite, as well as to investigate the effect of cavity preparation volume on those properties. In this experimental study, 120 human maxillary premolars were randomly divided into six groups according to the type of restoration and cavity volume (n = 20): (I) conservative MOD restored with Cention N, (II) conservative MOD restored with bonded Cention N, (III) conservative MOD restored with Z250 resin composite, (IV) extended MOD restored with Cention N, (V) extended MOD restored with bonded Cention N, and (VI) extended MOD restored with Z250 resin composite. Fracture strength (MPa) was tested using a universal testing machine. To investigate marginal adaptation, polyvinyl-siloxane impressions were taken and poured with epoxy resin. Resin replicas were examined by SEM (×400) for marginal adaptation. ANOVA tests, Tukey’s test, and independent t-test were used to analyze data ( P ≤ 0.05). Among conservative restorations, the fracture strength of bonded Cention N was significantly greater than that of Cention N ( P = 0.001), while in the extended preparations, there was no significant difference between fracture strengths of different types of restorations ( P = 0.579). In terms of marginal adaptation, there was no significant difference between different types of conservative restorations ( P = 0.232). However, in extended preparations, composite showed significantly lower marginal adaptation than Cention N and bonded Cention N ( P = 0.004 and P = 0.045, respectively). Conservative preparations showed significantly greater fracture strength and marginal adaptation compared to extended ones in groups restored with composite. The volume of cavity preparation was shown to be effective in the materials fracture strength and marginal adaptation. Cention N showed promising results in terms of fracture strength and marginal adaptation.

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Section: Discussionmentioning

confidence: 99%

Fracture Strength and Marginal Adaptation of Conservative and Extended MOD Cavities Restored with Cention N

Firouzmandi

Alavi

Jafarpour

et al. 2021

International Journal of Dentistry

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“…This might be attributed to the presence of a continuous circle of dental structure composed from buccal and lingual cusps and intact marginal ridges. While the teeth with Class-II MOD cavity undergo a greater reduction in fracture resistance as a result of the damage at the marginal ridge, which weakens the residual tooth structure and increases their susceptibility to fracture [ 20 – 22 ]. This came in general agreement with other studies which reported that the intact teeth displayed a greater value of FR when compared to the prepared unrestored teeth [ 5 , 20 , 23 , 24 ].…”

Section: Discussionmentioning

confidence: 99%

“…While the teeth with Class-II MOD cavity undergo a greater reduction in fracture resistance as a result of the damage at the marginal ridge, which weakens the residual tooth structure and increases their susceptibility to fracture [20][21][22]. is came in general agreement with other studies which reported that the intact teeth displayed a greater value of FR when compared to the prepared unrestored teeth [5,20,23,24]. e second null hypothesis, which stated that there would be nonsignificant difference in FR value of premolar restored with bulk-fill restorative materials and that incrementally restored with conventional composite was accepted.…”

Section: Discussionmentioning

confidence: 99%

Assessing Fracture Resistance of Restored Premolars with Novel Composite Materials: An In Vitro Study

Al-Ibraheemi

Jawad

Haider

2021

International Journal of Dentistry

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During restorative treatment, premolars restored with resin filling materials using the conventional incremental-fill technique take longer restoration time and undermine the integrity of the tooth. The aim of this study was to assess fracture resistance of premolars restored by various types of novel bulk-fill composite resin materials. Forty-eight (n = 48) freshly extracted sound maxillary first premolars were used in this in vitro study. The teeth were divided into six groups, each having 8 specimens. Group A (positive control) was allocated for the intact teeth. For specimens in Groups B to F, a large cavity (Class-II MOD) was prepared with a standardized dimension of cavity (3 mm depth on the pulpal floor, 4 mm at the gingival seat, and 3 mm cavity width). Group B represented prepared teeth without any restoration. Group C, Group D, Group E, and Group F were restored with Tetric EvoCeram® incremental-fill (conventional), Beautifil bulk-fill, Filtek posterior bulk-fill, and SonicFill 2 bulk-fill restorative materials, respectively. All samples were finished and polished with an enhanced finishing kit and stored in distilled water for a month before the fracture resistance testing. All the samples were exposed to the axial loading (the speed of crosshead was 1 mm/min) in a computer-controlled universal testing machine (LARYEE, China) via a steel bar (6 mm in diameter) and the maximum applied force in Newton was recorded as the fracture resistance. One-way analysis of variance (SPSS 21) was used to compare the fracture resistance within the groups, and Tukey’s post hoc test was used to determine the difference between the groups. The lowest value of fracture resistance was recorded for Group B, and the highest value was recorded for Group A followed by the values of Group D, Group C, Group F, and Group E. One-way ANOVA revealed a statistically significant difference between the groups ( P < 0.05 ). Nonsignificant difference was found between the premolars restored by bulk-fill and conventional composites. Among the bulk-fill restored specimens, Beautifil restorative demonstrated significantly higher fracture resistance in comparison with the other two bulk-fill restored specimen groups (SonicFill 2 and Filtek). Bulk-fill composite such as Beautifil could be an alternative option to conventional incremental-fill composite for premolar restoration.

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“…15 The negative control (prepared unrestored teeth) group, on the other hand, had the lowest FR values, which might be related to the MOD cavity preparation's weakening impact as a result of the damage at the marginal ridge, which weakens the residual tooth structure. 35 Amongst the restored groups, Aura BF group showed the highest FR values with no significant difference with the conventional Filtek Z350 XT restored group. This result might be attributed to the high filler loading (81% and 78.5%) respectively.…”

Section: P1: Comparison Between Aura Bf and Other Groups P2: Comparis...mentioning

confidence: 84%

Cuspal Deflection and Fracture Resistance of Maxillary Premolars with Complex Class II and Restored with Contemporary Bulk-Fill Resin Composite

2022

Mansoura Journal of Dentistry

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Objective: This study aimed to evaluate cuspal deflection (CD) and fracture resistance (FR) of maxillary premolars with Mesio-occluso-distal (MOD) cavities and restored with conventional and bulk-fill resin composites. Materials and Methods: One conventional (Filtek Z350XT) and two recent bulk-fill (Aura, and Reveal HD) resin composites were used. A total number of 120 maxillary premolars were used in this study. For CD test, 45 maxillary premolars prepared with standardized MOD cavity preparations and were divided into three groups (n=15). The different three resin composites (RCs) were used to restore the three groups. The CD values were measured using a digital micrometer five minutes after restoration completion. For FR test, 75 maxillary premolars were divided into five groups (n=15), positive control group (intact unprepared), and four groups received MOD cavities, negative control (prepared unrestored), and three groups restored as in CD test. A universal testing machine (Instron) was used to measure FR in Newton (N), and mode of failure was assessed. Results: The mean CD was significantly different in the three groups (p≤0.001). The highest deflection was noted in Filtek Z350XT (12.73±2.52 μm), the lowest was noted in Aura BF (5.60±0.74 μm). Highest FR was noted in the positive control group (1502±183.85 N) with significant difference with other groups (p≤0.001), followed by Aura BF (964.3±183.8 N) and Filtek Z350 XT (927.62±177.1 N) with no significant difference (p=0.501). The lowest FR value within the restored groups was noted in Reveal HD BF (787.9±98.2 N), and the negative control group revealed the lowest FR value in all tested groups (353.9±40.51 N). There was no significant difference between the materials regarding the failure mode. Conclusion: Bulk-Fill resin composites had less significant CD. However, fracture resistance values were material dependent.

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Evaluation of the fracture resistance of premolars with extensive and medium cavity preparations restored with direct restoring systems

Abstract: The cavity preparation weakens the remaining tooth structure; however, its resistance could be partially restored using direct adhesive restorations.

Cited by 7 publications

References 1 publication

Fracture Strength and Marginal Adaptation of Conservative and Extended MOD Cavities Restored with Cention N

Fracture Strength and Marginal Adaptation of Conservative and Extended MOD Cavities Restored with Cention N

Assessing Fracture Resistance of Restored Premolars with Novel Composite Materials: An In Vitro Study

Cuspal Deflection and Fracture Resistance of Maxillary Premolars with Complex Class II and Restored with Contemporary Bulk-Fill Resin Composite

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