Influence of Low-pH Beverages on the Two-Body Wear of CAD/CAM Monolithic Materials

Abstract

The aim of this in vitro study is to evaluate the effect of different acidic media on volumetric wear and surface roughness of CAD/CAM monolithic materials. Forty-eight rectangular specimens were prepared using different CAD/CAM monolithic materials: nanohybrid composite (Grandio Blocks, Voco), resin-based composite (Cerasmart, GC), lithium disilicate (E-Max, Ivoclar), and high-translucency zirconia (Katana STML, Kuraray Noritake). After storage in distilled water at 37 °C for two days, the specimens were tested using a chewing machine with a stainless-steel ball as an antagonist (49N loads, 250,000 cycles). Testing was performed using distilled water, Coca-Cola, and Red Bull as abrasive media. Wear and surface roughness analyses of the CAD/CAM materials were performed using a 3D profilometer and analyzed with two-way analysis of variance and post hoc pairwise comparison procedures. Worn surfaces were examined using scanning electron microscopy. Resin-based materials suffered higher volumetric wear than ceramics (p = 0.00001). Water induced significantly less volumetric wear than the other tested solutions (p = 0.0014), independent of the material tested. High-translucency zirconia showed less surface roughness than all the other materials tested. The selection of monolithic CAD/CAM materials to restore worn dentition due to erosive processes could impact restorative therapy stability over time. Resin-based materials seem to be more influenced by the acidic environment when subjected to a two-body wear test.

Evaluation of colour stability and surface roughness of three CAD/CAM materials (IPS e.max, Vita Enamic, and PEEK) after immersion in two beverage solutions: An in vitro study

“…Coffee is a mild acid with PH=5.8, composed of caffeine, tannic acid, citric acid, chlorogenic acid, while Coca-Cola is a strong acid with PH=2.5 composed of phosphoric acid, carbonated water, sugar, and caramel colour [15,16] . Dental restorative materials when exposed to the oral cavity may develop a change in colour and surface roughness, which is caused by a variety of reasons, including the type of the material, surface finishing, patient's dietary habits and oral hygiene.…”

Wear Behaviour of Polymer-Infiltrated Network Ceramics, Lithium Disilicate and Cubic Zirconia against Enamel in a Bruxism-Simulated Scenario

“…Therefore, it is not surprising that their wear behaviour mostly consisted of delamination starting from wear facets [ 33 ]. Previous studies showed how the ZR delamination phenomenon seems to be more similar to the sound enamel wear mechanism, with several cracks regularly distributed throughout the entire extension of the wear pattern [ 34 , 35 ]. On the contrary, the LS group showed a more irregular surface and crack propagation pattern, both inside and outside of the wear scar’s area [ 36 ].…”

Influence of Acidic Environment on the Hardness, Surface Roughness and Wear Ability of CAD/CAM Resin-Matrix Ceramics

“…In today’s world, wear of restoration has become a common and serious problem. Restorative materials are exposed to a complex environment in the oral cavity, where they undergo severe chemical and physical stresses due to temperature changes, functional and parafunctional loads and chemicals from food and drinks [ 14 , 15 ], especially the erosive potential of acidic drinks [ 16 ]. To provide long-term stability, dental materials should demonstrate good wear resistance [ 17 ].…”