Restorative Dentistry & Endodontics

Effect of dentin roughening and type of composite material on the restoration of non-carious cervical lesions: an in vivo study with 18 months of follow-up: Sanjana Verma, Rakesh Singla, Gurdeep Singh Gill, Namita Jain; Restor Dent Endod 2023;48(4):e35. Published online October 17, 2023; DOI: https://doi.org/10.5395/rde.2023.48.e35

Abstract PDF PubReader ePub: Objectives
The purpose of this study was to evaluate the impact of dentin roughening and the type of composite resin used (either bulk-fill flowable or nanohybrid) on the restoration of non-carious cervical lesions (NCCLs) with an 18-month follow-up period.
Materials and Methods
This prospective split-mouth study included 36 patients, each with a minimum of 4 NCCLs. For each patient, 4 types of restorations were performed: unroughened dentin with nanohybrid composite, unroughened dentin with bulk-fill flowable composite, roughened dentin with nanohybrid composite, and roughened dentin with bulk-fill flowable composite. A universal bonding agent (Tetric N Bond Universal) was applied in self-etch mode for all groups. The restorations were subsequently evaluated at 6, 12, and 18 months in accordance with the criteria set by the FDI World Dental Federation. Inferential statistics were computed using the Friedman test, with the level of statistical significance established at 0.05.
Results
The 4 groups exhibited no significant differences in relation to fracture and retention, marginal staining, marginal adaptation, postoperative hypersensitivity, or the recurrence of caries at any follow-up point.
Conclusions
Within the limitations of the present study, over an 18-month follow-up period, no significant difference was present in the clinical performance of bulk-fill flowable and nanohybrid composite restorations of non-carious cervical lesions. This held true regardless of whether dentin roughening was performed.

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A combined approach to non-carious cervical lesions associated with gingival recession: SungEun Yang, HyeJin Lee, Sung-Ho Jin; Restor Dent Endod 2016;41(3):218-224. Published online May 2, 2016; DOI: https://doi.org/10.5395/rde.2016.41.3.218

Abstract PDF PubReader ePub: Non-carious cervical lesions (NCCLs) with gingival recession require specific consideration on both aspects of hard and soft tissue lesion. In the restorative aspect, careful finishing and polishing of the restorations prior to mucogingival surgery is the critical factor contributing to success. Regarding surgery, assessment of the configuration of the lesion and the choice of surgical technique are important factors. The precise diagnosis and the choice of the proper treatment procedure should be made on the basis of both restorative and surgical considerations to ensure the successful treatment of NCCLs.

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The influence of combining composite resins with different elastic modulus on the stress distribution of Class V restoration: a three-dimensional finite element study: Jeong-Kil Park, Bock Hur, Sung-Kyo Kim; J Korean Acad Conserv Dent 2008;33(3):184-197. Published online May 31, 2008; DOI: https://doi.org/10.5395/JKACD.2008.33.3.184

Abstract PDF PubReader ePub

This study was to investigate the influence of combining composite resins with different elastic modulus, and occlusal loading condition on the stress distribution of restored notch-shaped non-carious cervical lesion using 3D finite element (FE) analysis.

The extracted maxillary second premolar was scanned serially with Micro-CT. The 3D images were processed by 3D-DOCTOR. ANSYS was used to mesh and analyze 3D FE model. A notch-shaped cavity was modeled and filled with hybrid, flowable resin or a combination of both. After restoration, a static load of 500N was applied in a point-load condition at buccal cusp and palatal cusp. The stress data were analyzed using analysis of principal stress.

Results showed that combining method such that apex was restored by material with high elastic modulus and the occlusal and cervical cavosurface margin by small amount of material with low elastic modulus was the most profitable method in the view of tensile stress that was considered as the dominant factor jeopardizing the restoration durability and promoting the lesion progression.

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Stress distribution of Class V composite resin restorations: A three-dimensional finite element study: Jeong-Kil Park, Bock Hur, Sung-Kyo Kim; J Korean Acad Conserv Dent 2008;33(1):28-38. Published online January 31, 2008; DOI: https://doi.org/10.5395/JKACD.2008.33.1.028

Abstract PDF PubReader ePub

This study was to investigate the influence of composite resins with different elastic modulus, cavity modification and occlusal loading condition on the stress distribution of restored notch-shaped noncarious cervical lesion using 3-dimensional (3D) finite element (FE) analysis.

The extracted maxillary second premolar was scanned serially with Micro-CT. The 3D images were processed by 3D-DOCTOR. ANSYS was used to mesh and analyze 3D FE model. A notch-shaped cavity and a modified cavity with a rounded apex were modeled. Unmodified and modified cavities were filled with hybrid or flowable resin. After restoration, a static load of 500N was applied in a point-load condition at buccal cusp and palatal cusp. The stress data were analyzed using analysis of principal stress.

The results were as follows:

In the unrestored cavity, the stresses were highly concentrated at mesial CEJ and lesion apex and the peak stress was observed at the mesial point angle under both loading conditions.

After restoration of the cavity, stresses were significantly reduced at the lesion apex, however cervical cavosurface margin, stresses were more increased than before restoration under both loading conditions.

When restoring the notch-shaped lesion, material with high elastic modulus worked well at the lesion apex and material with low elastic modulus worked well at the cervical cavosurface margin.

Cavity modification the rounding apex did not reduce compressive stress, but tensile stress was reduced.

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Effects of occlusal load on the stress distribution of four cavity configurations of noncarious cervical lesions: A three-dimensional finite element analysis study: Sang-Je Jeon, Jeong-Kil Park, Hyeon-Cheol Kim, Sung-Gwan Woo, Kwang-Hoon Kim, Kwon Son, Bock Hur; J Korean Acad Conserv Dent 2006;31(5):359-370. Published online January 14, 2006; DOI: https://doi.org/10.5395/JKACD.2006.31.5.359

Abstract PDF PubReader ePub

Abstract

The objective of this study was to investigate the effect of excessive occlusal loading on stress distribution on four type of cervical lesion, using a three dimensional finite element analysis (3D FEA).

The extracted maxillary second premolar was scanned serially with Micro-CT. The 3D images were processed by 3D-DOCTOR. ANSYS was used to mesh and analyze 3D FE model. Four different lesion configurations representative of the various types observed clinically for teeth were studied. A static point load of 500N was applied to the buccal and lingual cusp (Load A and B). The principal stresses in lesion apex, and vertical sectioned margin of cervical wall were analyzed.

The results were as follows

The patterns of stress distribution were similar but the magnitude was different in four types of lesion.

The peak stress was observed at mesial corner and also stresses concentrated at lesion apex.

The compressive stress under load A and the tensile stress under load B were dominant stress.

Under the load, lesion can be increased and harmful to tooth structure unless restored.

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