Influence of cavosurface angle on the stress concentration and gaps formation in class V resin composite restorations

Correia, Ayla Macyelle de Oliveira; Pereira, Victoria Elisa Maciel; Bresciani, Eduardo; Platt, Jeffrey A.; Borges, Alexandre Luiz Souto; Caneppele, Taciana Marco Ferraz

doi:10.1016/j.jmbbm.2019.05.034

Cited by 9 publications

(5 citation statements)

References 43 publications

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“…Meanwhile, the stress reduction at the root may be due to the loss of contact between the root and the bone tissue due to the defect of preapical bone, which naturally leads to a decrease in root stress. What’s more, this change in stress can lead to a polarization of stresses within the tooth and finally have an extremely destructive effect on the residual dental hard tissue [ 41 , 42 ].…”

Section: Discussionmentioning

confidence: 99%

The effect of periapical bone defects on stress distribution in teeth with periapical periodontitis: a finite element analysis

Chen,

Ye,

Hong

et al. 2023

BMC Oral Health

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Background Apical periodontitis directly affects the stress state of the affected tooth owing to the destruction of the periapical bone. Understanding the mechanical of periapical bone defects/tooth is clinically meaningful. In this study, we evaluate the effect of periapical bone defects on the stress distribution in teeth with periapical periodontitis using finite element analysis. Methods Finite element models of normal mandibular second premolars and those with periapical bone defects (spherical defects with diameters of 5, 10, 15, and 20 mm) were created using a digital model design software. The edges of the mandible were fixed and the masticatory cycle was simplified as oblique loading (a 400 N force loaded obliquely at 45° to the long axis of the tooth body) to simulate the tooth stress state in occlusion and analyze the von Mises stress distribution and tooth displacement distribution in each model. Results Overall analysis of the models: Compared to that in the normal model, the maximum von Mises stresses in all the different periapical bone defect size models were slightly lower. In contrast, the maximum tooth displacement in the periapical bone defect model increased as the size of the periapical bone defect increased (2.11–120.1% of increase). Internal analysis of tooth: As the size of the periapical bone defect increased, the maximum von Mises stress in the coronal cervix of the tooth gradually increased (2.23–37.22% of increase). while the von Mises stress in the root apical region of the tooth showed a decreasing trend (41.48–99.70% of decrease). The maximum tooth displacement in all parts of the tooth showed an increasing trend as the size of the periapical bone defect increased. Conclusions The presence of periapical bone defects was found to significantly affect the biomechanical response of the tooth, the effects of which became more pronounced as the size of the bone defect increased.

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Section: Discussionmentioning

confidence: 99%

The effect of periapical bone defects on stress distribution in teeth with periapical periodontitis: a finite element analysis

Chen,

Ye,

Hong

et al. 2023

BMC Oral Health

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“…44 On contrary to our result, several authors reported that using this technique for composite application leads to an increase in the Cfactor, and thereupon increases the shrinkage stresses between the opposing cavity walls which lead to microleakage. 45,46 The next best result of microleakage distribution was the oblique technique (GpIII) (Figure 4). Our results were in agreement with Lopes et al, 47 and Loguercio et al, 48 who documented that the combined simultaneous different layers using the oblique placement technique may result in much more shrinkage stress and microleakage.…”

Section: Discussionmentioning

confidence: 99%

Influence of Different Placement Techniques of Bulk-fill Resin Composite on Microleakage of Class II Cavity Preparation

Bubteina,

I. Faraj,

M. Betamar

2021

Libyan J Dent

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Aim: To evaluate the microleakage at the gingival seat of the class II cavity restored with bulk-fill resin composite using different placement techniques. Materials and Methods: Two standardized class II cavities (MO and DO) were prepared in forty sound extracted human premolars. The cervical margin of the proximal box is located at 1 mm occlusal to the cementoenamel junction (CEJ). The prepared teeth were divided into four groups of 10 teeth each (n=20 cavities) and restored with Tetric N-Bond total-etch adhesive, followed by resin composite, Tetric N-Ceram Bulk-fill placed in four different techniques: GpI; as bulk-fill in a single increment, GpII; horizontal layering, GpIII; oblique (wedge-shaped) layering, GpIV; vertical layering. All restored teeth were stored in distilled water for 24h at 37ºC, thermocycled, and then soaked in 2% methylene blue dye for 24h. Teeth were then sectioned for microleakage evaluation using a stereomicroscope. Data were collected and statistically analyzed. Two specimens from each group were selected at random and examined under a scanning electron microscope (SEM) for marginal adaptation of restoration. Results: No statistically significant differences in the microleakage score were observed between the four placement techniques (P=0.610). However, bulk placement had the highest mean and median score (3.0 ±1.45&4). The horizontal, oblique, and vertical techniques had lower scores than bulk placement (2.30±1.81, 2.6±1.66, 2.45±1.61) respectively. Conclusions: Microleakage could not be eliminated by any of the tested placement techniques. Incremental placement techniques showed a lower score of microleakage compared with the bulk placement. The horizontal layering of bulk-fill composite showed the best results in terms of the marginal seal with tooth structure.

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“…For the extension of NCCLs, previous studies showed that some cavity con gurations might favor stress concentration at the bonded interface more than others [17,[19][20], which could contribute to premature failure of the resin composite restorations. A recent systematic review and meta-analysis [21] pointed out that the cavity extension did not in uence the retention of resin composite restoration.…”

Section: Introductionmentioning

confidence: 99%

Effects of lesion size on the 30-month clinical performance of restorations with bulk fill and a regular nanofilled resin composite in noncarious cervical lesions

et al. 2023

Self Cite

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Objective: The aim of this double-blind, randomized controlled trial was to evaluate the in uence of the occlusogingival distance (OGD) in noncarious cervical lesions (NCCLs) on the clinical performance of a regular bulk-ll resin composite and a regular nano lled resin composite.Materials and Methods: 140 NCCLs in 77 participants were randomly divided into four groups (n=35), according to OGD (1.5 mm±10% or 3 mm±10%) and resin composites (Filtek Bulk Fill Posterior [B] or Filtek Z350 XT [C]), namely: 1.5 mm-B, 1.5 mm-C, 3 mm-B, and 3 mm-C. The restorations were bonded using a two-step self-etch adhesive (Clear l SE Bond), applied following the manufacturer's instructions. Restorations were polished 1 week after placement. Two experienced and calibrated examiners evaluated the restorations using modi ed US Public Health Service criteria at baseline (7 days) and after 6, 12, 18, 24 and 30 months. Statistical analyses were carried out using Kruskal-Wallis, Friedman's repeated measures analysis of variance and the Wilcoxon Signed rank test (α = 0.05).Results: After 30 months, the recall rate was 94.2%. Eight restorations were lost (3 for 1.5 mm-C, 2 for 1.5 mm-B, 1 for 3 mm-C and 2 for 3 mm-B). All groups resulted in a signi cantly worse marginal discoloration and surface texture at 30 months in comparison with the baseline (one week). Conclusion:The restorations performed with both resin composites produced clinically acceptable restorations. The OGD of NCCLs of did not in uence the clinical performance of restorations.Clinical signi cance: The regular bulk-ll material showed excellent clinical behavior in NCCLs of different sizes, similar to the regular nano lled resin composite.

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Influence of cavosurface angle on the stress concentration and gaps formation in class V resin composite restorations

Cited by 9 publications

References 43 publications

The effect of periapical bone defects on stress distribution in teeth with periapical periodontitis: a finite element analysis

The effect of periapical bone defects on stress distribution in teeth with periapical periodontitis: a finite element analysis

Influence of Different Placement Techniques of Bulk-fill Resin Composite on Microleakage of Class II Cavity Preparation

Effects of lesion size on the 30-month clinical performance of restorations with bulk fill and a regular nanofilled resin composite in noncarious cervical lesions

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