###### Abstract  
The knowledge on the surface deviations and wear of recently introduced additively or subtractively manufactured materials indicated for definitive prosthesis is limited. The aim of this present study was to evaluate the external surface and mesiodistal width deviation and the occlusal surface wear of one additively manufactured composite resin (MS) and three subtractively manufactured resins (nanographene-reinforced polymethylmethacrylate (GR), conventional polymethylmethacrylate (PMMA), and reinforced composite resin (BC)) after thermomechanical aging. Molar-shaped crowns were fabricated in the tested materials and digitized with an intraoral scanner (CEREC Primescan; Dentsply Sirona, Bensheim, Germany). Each crown was subjected to thermomechanical aging and rescanned with the same scanner. A three-dimensional analysis software (Geomagic Control X v.2022.1; 3D Systems, Rock Hill, SC, USA) was used to calculate the deviations on the external surface, mesiodistal width, and wear on the occlusal surfaces of the tested crowns. Data were analyzed using one-way ANOVA and [PERSON]'s tests (\(\alpha\) = 0.05). MS had higher external surface deviations than PMMA and GR (\(p\)\(\leq\) 0.038) and higher mesiodistal width deviations than PMMA and BC (\(p\) = 0.004). BC and GR had higher volume loss than PMMA (\(p\)\(\leq\) 0.002). The additively manufactured composite resin was more prone to deviations, while reinforced composite resin had lower wear resistance than most of the tested materials.  
additive manufacturing; external deviation; mesiodistal width; occlusal wear; thermomechanical aging +
Footnote †: journal: Applied  
Wear is material loss from the surface, and it is a multifactorial process that can be either physiological or pathological when intraoral situations are considered [11]. An ideal restorative material should wear similar to that of natural dentition [12], and excessive wear might lead to the loss of both esthetics and function [13]. The wear behavior of a material depends on various properties, such as filler size, filler volume, filler hardness, elastic modulus, fracture toughness, and hardness [14].  
Even though additively manufactured composite resins [4; 15; 16; 17; 18; 19; 20; 21; 22; 23] and nanographenreinforced PMMA [3; 5; 6; 7; 19; 24; 25; 26; 27] have been investigated previously, only one study has focused on the comparison between these materials as [PERSON] et al. [19] investigated the fabrication trueness of these materials when fabricated as crowns. Given that restorative materials should maintain their integrity intraorally, a study based on how these new-generation resin-based CAD-CAM materials indicated for definitive prostheses behave after thermomechanical aging could elaborate the knowledge on their clinical applicability. However, to the authors' knowledge, only two studies evaluated the wear of additively manufactured composite resins [21; 22], and the wear of nanographene-reinforced PMMA has not been investigated. Therefore, the aim of this present study was to compare the external surface and mesiodistal width deviations (any change in the external surface or mesiodistal width determined using the greatest mesiodistal width of the occlusal third of the crowns due to leaching or water absorption during thermomechanical aging) and occlusal surface wear (material loss from the occlusal surface during thermomechanical aging) of one additively manufactured composite resin and three subtractively manufactured resins (one nanographene-reinforced PMMA, one PMMA, and one reinforced composite resin) after thermomechanical aging. The null hypotheses were that material type would not affect external surface deviations, mesiodistal width deviations, and occlusal surface wear after thermomechanical aging.