Mechanical benefits of conservative restoration for dental fissure caries

Zhang, Zhongpu; Zheng, Keke; Li, Eric; Li, Wei; Li, Qing; Swain, Michael V.

doi:10.1016/j.jmbbm.2015.08.010

Cited by 35 publications

(22 citation statements)

References 48 publications

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“…As mentioned in Section , several studies have explained PDL behaviour using elastic isotropic or hyperelastic material formulations . Moreover, some computational studies have attempted to explain the nonlinear anisotropic behaviour by introducing collagen fibres as 1D FE elements .…”

Section: Discussionmentioning

confidence: 99%

“…As mentioned in Section 1, several studies have explained PDL behaviour using elastic isotropic or hyperelastic material formulations. 23,25,26 Moreover, some computational studies have attempted to explain the nonlinear anisotropic behaviour by introducing collagen fibres as 1D FE elements. 60 On the other hand, some researchers have explained the effect of the PDL interstitial fluid by means of viscoelastic material formulations.…”

Section: Characterization and Validation Of The Materials Modelmentioning

confidence: 99%

“…The authors of these studies assert the importance of considering the irregular geometry of the PDL to obtain reliable results. Some FE studies use isotropic hyperelastic or elastic properties 23,25,26 for the ligament or viscoelastic material models. 27,28 Instead of defining the PDL as an isotropic tissue without fluid coupling, we considered the porous and fibrous components of the PDL in our previous study.…”

Section: Introductionmentioning

confidence: 99%

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A porous fibrous hyperelastic damage model for human periodontal ligament: Application of a microcomputerized tomography finite element model

Ortún‐Terrazas

Cegoñino

Santana‐Penín

et al. 2019

Numer Methods Biomed Eng

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The periodontal ligament (PDL) is a soft biological tissue that connects the tooth with the trabecular bone of the mandible. It plays a key role in load transmission and is primarily responsible for bone resorption and most common periodontal diseases. Although several numerical studies have analysed the biomechanical response of the PDL, most did not consider its porous fibrous structure, and only a few analysed damage to the PDL. This study presents an innovative numerical formulation of a porous fibrous hyperelastic damage material model for the PDL. The model considers two separate softening phenomena: fibre alignment during loading and fibre rupture. The parameters for the material model characterization were fitted using experimental data from the literature. Furthermore, the experimental tests used for characterization were computationally modelled to verify the material parameters. A finite element model of a portion of a human mandible, obtained by microcomputerized tomography, was developed, and the proposed constitutive model was implemented for the PDL. Our results confirm that damage to the PDL may occur mainly because of overpressure of the interstitial fluid, while large forces must be applied to damage the PDL fibrous network. Moreover, this study clarifies some aspects of the relationship between PDL damage and the bone remodelling process.

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Section: Discussionmentioning

confidence: 99%

Section: Characterization and Validation Of The Materials Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A porous fibrous hyperelastic damage model for human periodontal ligament: Application of a microcomputerized tomography finite element model

Ortún‐Terrazas

Cegoñino

Santana‐Penín

et al. 2019

Numer Methods Biomed Eng

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“…Moreover, pits and fissures have been partially filled up with the RI (compare Figures 1 and 5). Accordingly, non-removed initial carious lesions that have been infiltrated and hardened would act as stress breakers, 44 thus avoiding any repeated pressure forging of the polymerised sealant (a phenomenon known as “trampoline effect”), exhibiting better fracture resistance compared with traditional restorative methods, 71 and leading to prolonged longevity of the final restoration. 70 …”

Section: Discussionmentioning

confidence: 99%

Resin infiltration of deproteinised natural occlusal subsurface lesions improves initial quality of fissure sealing

et al. 2017

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The aim of this ex vivo study was to evaluate the infiltration capability and rate of microleakage of a low-viscous resin infiltrant combined with a flowable composite resin (RI/CR) when used with deproteinised and etched occlusal subsurface lesions (International Caries Detection and Assessment System code 2). This combined treatment procedure was compared with the exclusive use of flowable composite resin (CR) for fissure sealing. Twenty premolars and 20 molars revealing non-cavitated occlusal carious lesions were randomly divided into two groups and were meticulously cleaned and deproteinised using NaOCl (2%). After etching with HCl (15%), 10 premolar and 10 molar lesions were infiltrated (Icon/DMG; rhodamine B isothiocyanate (RITC)-labelled) followed by fissure sealing (G-ænial Flo/GC; experimental group, RI/CR). In the control group (CR), the carious fissures were only sealed. Specimens were cut perpendicular to the occlusal surface and through the area of the highest demineralisation (DIAGNOdent pen, KaVo). Using confocal laser-scanning microscopy, the specimens were assessed with regard to the percentage of caries infiltration, marginal adaption and internal integrity. Within the CR group, the carious lesions were not infiltrated. Both premolar (57.9%±23.1%) and molar lesions (35.3%±22.1%) of the RI/CR group were uniformly infiltrated to a substantial extent, albeit with significant differences (P=0.034). Moreover, microleakage (n=1) and the occurrence of voids (n=2) were reduced in the RI/CR group compared with the CR group (5 and 17 specimens, respectively). The RI/CR approach increases the initial quality of fissure sealing and is recommended for the clinical control of occlusal caries.

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“…In silico analysis, for example, using finite element analysis, might be used to elucidate this further. A recent study in this direction, for example, found selective removal or sealing (ultraconservative removal) to have mechanical benefits over nonselective removal in shallow cavities …”

Section: Restorative Issues and Open Questionsmentioning

confidence: 99%