External Marginal Gap Evaluation of Different Resin-filling Techniques for Class II Restorations—A Micro-CT and SEM Analysis

Sampaio, Camila S.; Alvear, Gonzalo Andrés Garcés; Kolakarnprasert, Nantawan; Atria, P; Giannini, Marcelo; Hirata, Ronaldo

doi:10.2341/19-053-l

Cited by 13 publications

(15 citation statements)

References 31 publications

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“…Moreover, when restorations are placed below the CEJ, the quality of the marginal integrity is uncertain [30]. Findings from the current research indicate that different filling techniques can affect gap formation on the external interproximal margins of class II restorations [23]. The present study focused on the evaluation of internal and external gap formation using two different filling techniques for restoring class II restorations, by means of BFC.…”

Section: Discussionmentioning

confidence: 89%

“…Unlike other published studies [23], using optimized settings, it was possible to maximize the contrast between the densities of the different enamel, dentin and composite resin materials, in just a single scan, so that it was not necessary to perform scans before and after restoration, saving experimental time and vanishing possible artefacts introduced by the synchronization process. The Defect Analysis Tool of VG Studio MAX software has been calibrated to detect internal defects with a minimum volume of 5000 µm 3 , which means minimum linear dimension of around 20 µm.…”

Section: Discussionmentioning

confidence: 99%

“…To overcome all these drawbacks, X-ray micro-computed tomography (µ-CT) has recently been introduced to evaluate both PSS and the internal and external adaptation of resin composites [21][22][23]. Due to the penetrating capacity of X-rays, µ-CT allows clinicians to accurately analyse the restoration without sectioning the samples.…”

Section: Introductionmentioning

confidence: 99%

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Microleakage Analysis of Different Bulk-Filling Techniques for Class II Restorations: µ-CT, SEM and EDS Evaluations

et al. 2020

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This study aimed to compare two different bulk-filling techniques, evaluating the internal and external adaptation of class II resin-composite restorations, by analysing the gap formation using microcomputed tomography (µ-CT) and scanning electronic microscopy (SEM) coupled with energy-dispersive X-ray spectroscopy (EDS). Two standardized mesio/disto-occlusal (MO/DO) cavities were prepared in eight extracted human third molars that were divided, according to the filling technique used, in the following two groups (n = 4): BG (Bulk&Go group) and BT (Bulk Traditional group). After universal bonding application, followed by the light curing, all teeth were restored using a bulk-fill composite. Specimens were scanned with µ-CT to evaluate 3D interfacial gaps. Acquired µ-CT data were analysed to quantify the gap formation. Complementary information to the µ-CT analysis were obtained by SEM. Thereafter, the chemical composition of tooth–restoration interface was analysed using EDS. The µ-CT analysis revealed gaps formation at the tooth–restoration interface for both the BG and BT groups, while within the restoration, only in the BT group there was evidence of microleakage formation. The scanning electron micrographs of both groups showed that the external marginal integrity of the restoration was preserved, while EDS showed the three different structures (tooth surface, adhesive layer and resin composite) of the tooth–restoration interface, highlighting the absence of gap formation. In both BG and BT, the two filling techniques did not show significant differences regarding the internal and external marginal adaptation of the restoration. To achieve a successful restoration, the clinician could be advised to restore a class II cavity using a single increment bulk-filling technique (BG), thus treating it as a class I cavity.

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Section: Discussionmentioning

confidence: 89%

Section: Discussionmentioning

confidence: 99%

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Microleakage Analysis of Different Bulk-Filling Techniques for Class II Restorations: µ-CT, SEM and EDS Evaluations

et al. 2020

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“…46 Another study evaluated composite placed with the snowplow technique versus incremental placement, but using the low stress, flowable bulk-fill composite (SDR flow) as the first uncured flowable layer. 56 They assessed marginal adaptation with SEM and micro-CT and found that the snowplow method produced fewer gaps than an oblique incremental technique, but similar to a horizontal increment method with conventional composite. While not directly assessing marginal integrity, resindentin bond strength was compared in another study for two composites placed in class I cavities in increments, or with the snowplow method, or in bulk.…”

Section: Resultsmentioning

confidence: 99%

“…However, one study evaluated marginal adaptation of a heated composite without pre‐curing before the incremental fill, and showed no difference when compared with conventional incremental placement 46 . Another study evaluated composite placed with the snowplow technique versus incremental placement, but using the low stress, flowable bulk‐fill composite (SDR flow) as the first uncured flowable layer 56 . They assessed marginal adaptation with SEM and micro‐CT and found that the snowplow method produced fewer gaps than an oblique incremental technique, but similar to a horizontal increment method with conventional composite.…”

Section: Resultsmentioning

confidence: 99%

Probing the hierarchy of evidence to identify the best strategy for placing class II dental composite restorations using current materials

Ferracane

Lawson

2020

J Esthet Restor Dent

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Objective The objective of this review is to present a synopsis of the existing clinical and in vitro evidence regarding placement of direct class II restorations with dental composites of varying viscosities, focusing on the marginal integrity achievable. Overview The literature on class II composites placed with various techniques was searched through PubMed, Scopus, and the citations of identified articles, focusing on aspects related to adaptation and clinical performance. Studies comparing layering of conventional composite to layering with a flowable liner, including the “snow plow technique,” use of warmed composite, flowable bulk‐fill liners with a conventional composite capping layer, and bulk‐fill restorative in a single or incremental fill (including placement with sonic energy and dual‐curing) Conclusions In vitro and clinical evidence does not support any one specific method or material type for achieving optimal performance when restoring class II cavity preparations with current dental composites. Clinical significance Although there are many available placement methods and types of composite materials on the market for use in class II restorations, the reasonable success presented in the clinical and laboratory literature for the various approaches suggests that the most important factor for achieving success is likely careful and proper placement and light‐curing technique, independent of the approach.

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Assessment of internal porosities for different placement techniques of bulk-fill resin-based composites: a micro-computed tomography study

Al-Zain,

Baeesa,

Jassoma

et al. 2023

Clin Oral Invest

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Purpose: The aim was to compare the porosity of different bulk-ll resin-based composites (RBCs) placement techniques to the conventional incremental technique using microcomputed tomography (μ-CT).Methods: Occlusal cavities were prepared on extracted human molars that were allocated into ve placement technique groups (n=10): Monoblock-two-step technique: SureFil SDR ow+Ceram.X; Monoblock with sonic activation technique: SonicFill2; Monoblock-one-step technique: Tetric EvoCeram Bulk-Fill; Monoblock-two-step technique: Tetric EvoFlow Bulk-Fill+Tetric EvoCeram Bulk-Fill, and incremental technique: Filtek Z250. The number, volume of closed pores, and the total porosity was evaluated (μ-CT). Data were analyzed with analysis of variance on ranks (Student-Newman-Keuls method and Mann-Whitney rank-sum test) to verify the RBC viscosity and the socination placement technique signi cance. Porosity characteristics correlation was performed (Spearman correlation) (α= 0.05).Results: The SonicFill2 group presented a higher number of closed pores than the other groups (p<0.05).The volume and total porosity characteristics were similar among all groups (p>0.05). The overall porosity within the restoration bulk seemed greater in the following order: Filtek Z250>SonicFill2>Tetric EvoFlow Bulk-Fill+Tetric EvoCeram Bulk-Fill>Tetric EvoCeram Bulk-Fill>SureFil SDR Flow+Ceram.X.Sonication tended to increase the number (p=0.005) and volume (p=0.036) of closed pores. Increased viscosity of the materials tended to increase the closed pores volume (p=0.036). There was a strong correlation between the number and volume of closed pores (R 2 =0.549, p<001).Conclusions: The different placement techniques resulted in signi cantly less internal porosity than the monoblock with sonic activation technique (SonicFill2). Sonication during application contributed to the higher number and volume of closed pores than the passive bulk-ll RBCs application.

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External Marginal Gap Evaluation of Different Resin-filling Techniques for Class II Restorations—A Micro-CT and SEM Analysis

Cited by 13 publications

References 31 publications

Microleakage Analysis of Different Bulk-Filling Techniques for Class II Restorations: µ-CT, SEM and EDS Evaluations

Microleakage Analysis of Different Bulk-Filling Techniques for Class II Restorations: µ-CT, SEM and EDS Evaluations

Probing the hierarchy of evidence to identify the best strategy for placing class II dental composite restorations using current materials

Assessment of internal porosities for different placement techniques of bulk-fill resin-based composites: a micro-computed tomography study

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