Effect of brushing simulation on the wear behavior of repaired CAD-CAM restorations

Pablo Machado Soares; Amanda Maria de Oliveira Dal Piva; Gabriel Kalil Rocha Pereira; Luiz Felipe Valandro; Marilia Pivetta Rippe; Albert J Feilzer; Cornelis Johannes Kleverlaan; João Paulo Mendes Tribst

doi:10.1016/j.identj.2024.02.012

Effect of brushing simulation on the wear behavior of repaired CAD-CAM restorations

Int Dent J. 2024 Mar 8:S0020-6539(24)00066-2. doi: 10.1016/j.identj.2024.02.012. Online ahead of print.

Authors

Pablo Machado Soares¹, Amanda Maria de Oliveira Dal Piva², Gabriel Kalil Rocha Pereira¹, Luiz Felipe Valandro¹, Marilia Pivetta Rippe¹, Albert J Feilzer³, Cornelis Johannes Kleverlaan², João Paulo Mendes Tribst⁴

Affiliations

¹ Division of Prosthodontics-Biomaterials, Center for Development of Advanced Materials, Federal University of Santa Maria (UFSM), Santa Maria, Brazil.
² Department of Dental Materials Science, Academic Centre for Dentistry Amsterdam (ACTA), Universiteit van Amsterdam and Vrije Universiteit, Amsterdam, North Holland, The Netherlands.
³ Department of Dental Materials Science, Academic Centre for Dentistry Amsterdam (ACTA), Universiteit van Amsterdam and Vrije Universiteit, Amsterdam, North Holland, The Netherlands; Department of Reconstructive Oral Care, Academic Centre for Dentistry Amsterdam (ACTA), Universiteit van Amsterdam and Vrije Universiteit, Amsterdam, North Holland, The Netherlands.
⁴ Department of Reconstructive Oral Care, Academic Centre for Dentistry Amsterdam (ACTA), Universiteit van Amsterdam and Vrije Universiteit, Amsterdam, North Holland, The Netherlands. Electronic address: j.p.mendes.tribst@acta.nl.

PMID: 38461097
DOI: 10.1016/j.identj.2024.02.012

Abstract

Objective: The aim of the present study was to evaluate the influence of multidirectional brushing on the surface roughness, morphology, and bonding interface of resin-repaired CAD-CAM ceramic and composite restorations.

Materials and methods: Twelve (N = 12) blocks (4 mm × 4 mm × 2 mm for parallel axis; 5 mm × 4 mm × 2 mm for perpendicular axis) of lithium disilicate glass-ceramic (IPS e.max CAD, Ivoclar AG) and CAD-CAM resin composite (Tetric CAD, Ivoclar AG) were obtained and repaired with direct resin composite (Clearfil AP-X, Kuraray). An abrasive slurry was prepared and the brushing was performed according to each restorative material and axis of brushing (n = 6; perpendicular to repair interface and parallel to repair interface) during 3,650 cycles (240 strokes per minute) to simulate 3 years of brushing. The surface roughness (Ra) and the profile variation for each material (restoration and direct repair resin composite) were measured at the baseline condition and after brushing, and the mean roughness and presence of steps at the repair interface were evaluated through factorial analysis of Variance (ANOVA). Scanning Electron Microscopy (SEM) images were taken to evaluate the surface topography of the repaired materials after brushing.

Results: The mean roughness of the repaired CAD-CAM restorations was affected by the brushing (P < .05), mainly when evaluating the repair material and the interface (P < .05), while the restorative CAD-CAM materials presented more stable values. The profile evaluation showed higher steps at the interface when repairing lithium disilicate than for CAD-CAM resin composite.

Conclusion: Repaired CAD-CAM restorations were susceptible to wear after brushing simulation. The surface roughness of the direct resin composite was the most affected leading to step development at the interface, particularly in the repaired lithium disilicate samples. Cinical maintenance recalls and polishing protocols must be considered to enhance the longevity of such restorations.

Keywords: Dental restoration repair; Surface Loss; Surface roughness; Toothbrush wear.