Based on the underlying etiology and clinical presentation, appropriate restorative strategies can be selected to address tooth wear effectively. This section reviews evidence-based approaches to restorative management.
4.1. Etiological Control and Risk Management
Tooth wear, especially erosive tooth wear, is a multifactorial, progressive disease. Its etiology mainly includes extrinsic erosion (e.g., dietary acids) and intrinsic erosion (e.g., gastric acid reflux). Effective etiological control and risk management are key to preventing disease progression and reducing the need for complex restorative treatment.
First, identifying the source of the etiology is the primary step in management. Based on the location and clinical presentation, a preliminary judgment can be made between intrinsic or extrinsic erosion. Intrinsic erosion is often related to GERD, eating disorders, chronic alcoholism, etc. Extrinsic erosion is associated with acidic diet, occupational exposure, medication use, etc. [7]. Clinicians should conduct systematic assessment through detailed history taking, diet diaries, and clinical examination, combined with the BEWE scoring system.
Regarding dietary management, a hospital-based case-control study by O’Toole et al. (2017) indicated that the frequency of acidic drink intake, consumption of acidic foods between meals, and prolonged intraoral contact time of acidic substances (e.g., swishing juice, slow drinking) are significant risk factors for ETW [44]. Notably, in that study, consuming fruit with meals did not significantly increase the risk, whereas acidic drinks, whether consumed with or between meals, were significantly associated with ETW [44]. Although these findings provide valuable insights, they were derived from a specific population (adults referred to a dental hospital) and require confirmation in longitudinal studies with more diverse samples. From an etiological control perspective, patients should be advised to avoid acidic foods and drinks between meals, reduce the total daily intake of acidic beverages, and modify drinking habits (e.g., using a straw) to reduce contact time with teeth [7,44].
Oral hygiene behaviors also require individualized guidance. Although traditional advice emphasizes delaying brushing after meals to avoid further wear of softened enamel, O’Toole et al. (2017) found no significant independent association between brushing timing and ETW; brushing immediately after meals did not significantly increase tooth wear risk in their study population, suggesting that the traditional recommendation of delaying brushing after meals may need re-evaluation. Therefore, the focus of prevention should lean more towards dietary control rather than simply postponing brushing [44]. Furthermore, using low-abrasiveness toothpaste, soft-bristled toothbrushes, and avoiding immediate brushing after acid exposure—rinsing first with water, fluoride mouthwash, or milk to neutralize the acidic environment—is recommended [7].
For intrinsic causes, such as GERD or eating disorders, multidisciplinary management should be adopted. Patients with suspected GERD should be referred to gastroenterology for further diagnosis and management; patients with bulimia nervosa require psychological counseling; patients with obstructive sleep apnea and nocturnal reflux should undergo sleep studies and consider using CPAP or mandibular advancement devices [7].
In summary, etiological control for tooth wear, especially erosive tooth wear, is a systematic process requiring the integration of etiology identification, dietary intervention, behavior modification, and multidisciplinary collaboration to achieve comprehensive risk control from prevention to management.
4.2. Evidence-Based Evaluation of Restorative Material Performance
In the restorative treatment of tooth wear, material selection should be based on evidence of long-term clinical performance, comprehensively considering aesthetics, function, durability, and individual patient circumstances. Commonly used restorative materials include composite resins, ceramic materials (e.g., lithium disilicate, zirconia), resin nano-ceramics, and CAD/CAM materials. The performance of different materials is systematically evaluated below based on recent clinical studies.
4.2.1. Composite Resin Materials
Composite resins are widely used for direct restoration of moderate to severe tooth wear due to their ease of use, low cost, and minimally invasive nature [45]. The overall survival rate of direct composite restorations is lower than that of resin nanoceramic and indirect ceramic restorations [46], and one of the key factors affecting their long-term survival is the wear behavior of the composite resin [47].
Although composite resins have complications such as wear, staining, or fracture (annual complication rate about 2.16%) [46], their reparability maintains their advantage in early and intermediate restorations [48].
4.2.2. Ceramic Materials
Ceramic materials, known for their excellent mechanical strength, wear resistance, and aesthetic properties, are the preferred choice for restorations in high-load areas [49,50]. Lithium disilicate glass ceramics (e.g., IPS e.max) perform excellently in both anterior and posterior restorations, with high aesthetic match, suitable for veneers, inlays/onlays, and crowns [49,50]. Long-term randomized controlled trials show a success rate exceeding 98% over 6 years, with color match superior to zirconia [49]. Good outcomes have also been achieved in occlusal vertical dimension reconstruction [50]. Zirconia has excellent mechanical properties, suitable for posterior high-load areas, but its high hardness may cause wear of opposing enamel. Studies show that the vertical wear of opposing natural teeth by zirconia crowns (average 46 μm) is significantly higher than controls, suggesting careful occlusal design and consideration for protecting opposing teeth when using it [51]. Systematic reviews indicate that ceramic materials have the lowest annual failure rate (0.04%), significantly lower than composite resin (0.64%) and resin nano-ceramic (0.13%) [46].
4.2.3. CAD/CAM Resin Matrix Composites
The application of CAD/CAM technology provides minimally invasive, personalized solutions for tooth wear restoration, particularly suitable for materials like resin nano-ceramics (e.g., Lava Ultimate) and polymer-infiltrated ceramic network (PICN) [52]. CAD/CAM resin-based composites showed an overall survival rate of 96.8–100% over 5.5 years of follow-up, but failure risk was higher in molar regions, with fracture being the main failure reason [52]. Clinical evidence indicates that one limitation of CAD/CAM resin-matrix composites is their tendency to exhibit more noticeable wear within the first year after placement. To address this, the routine use of an occlusal splint has been proposed [48]. Nevertheless, these materials remain a valuable option for minimally invasive rehabilitation of worn dentition [48].
4.2.4. Emerging Materials and Development Trends
In recent years, new materials such as resin-infiltrated ceramics and polyoxymethylene (POM) have been gradually applied clinically. POM has good mechanical properties and biocompatibility, suitable for removable partial dentures, but its wear resistance still needs improvement [53]. In the future, with advancements in material science and digital technology, restorative materials will become more personalized and functional.
In summary, direct composite resin is suitable for anterior teeth, balancing minimally invasive and repairable advantages [45]; ceramic materials (e.g., lithium disilicate, zirconia) are more suitable for posterior high-load areas, offering excellent mechanical properties and long-term durability [49]; CAD/CAM resin-based composites serve as minimally invasive options with acceptable medium-term survival rates, but require higher maintenance in molar regions [52]. More high-quality, long-cycle randomized controlled trials are still needed in the future to further refine the evidence base for restorative material selection.
4.3. Achieving Long-Term Stable Bonding and Digital Technologies
In the restorative treatment of tooth wear, achieving long-term stable bonding between the restoration and tooth structure is key to success. With the rapid development of material science and digital technology, modern restorative therapy can restore vertical dimension, function, and aesthetics through minimally invasive means, significantly enhancing the longevity and predictability of restorations. This section reviews adhesive techniques and material selection, integration of digital workflows, and long-term stability and clinical outcomes.
4.3.1. Adhesive Techniques and Material Selection
Bonding is the core of long-term survival for minimally invasive restorations. For anterior veneers and posterior inlays/onlays, lithium disilicate ceramics are widely used due to their excellent mechanical properties, aesthetics, and reliable bonding performance [50]. The standard bonding protocol includes hydrofluoric acid etching, silane coupling agent application, selective enamel etching, and the use of universal adhesives and resin cements (e.g., Variolink series) [50]. Studies show that lithium disilicate restorations using this protocol have a high long-term survival rate [50]. For ultra-translucent multilayer zirconia, its chemical inertness must be addressed through specific surface treatment protocols. The “APC zirconia bonding concept” is recommended, including Airborne-particle abrasion (A), ceramic primer containing MDP monomer (B), and composite resin Cement (C), clinically demonstrating reliable bond strength and long-term stability [54].
4.3.2. Digital Workflows
Digital technology provides an efficient and predictable treatment pathway for full-mouth rehabilitation. Acquiring digital models via intraoral scanning, combined with 3D facial photography or stereophotogrammetry systems, allows precise assessment of vertical dimension changes and their impact on facial soft tissues [55]. In virtual design, Digital Smile Design (DSD) and virtual articulators enable clinicians to simulate post-restorative aesthetics and function and communicate expected outcomes with patients [54].
Digital processes have been proven to have certain advantages in multiple studies. Ibrahim et al. reported that by combining facial scanning with CAD/CAM technology, increasing the vertical dimension in full-mouth bonded rehabilitations, and testing the new jaw position using high-performance polycarbonate provisional restorations, the final lithium disilicate restorations showed no failures over 9 years of follow-up [56]. Kreulen et al. also confirmed that CAD/CAM nano-composite resin restorations offer minimally invasive advantages with good functional and aesthetic recovery in severely worn dentitions [57]. Furthermore, Gkantidis et al. developed a digital wear assessment method based on 3D superimposition, providing a high-precision tool for pre-operative planning and post-operative monitoring [58]. The introduction of artificial intelligence further enhances diagnostic efficiency, such as the deep learning-based tooth wear grading system developed by Pang et al., achieving 93% accuracy [23].
4.3.3. Long-Term Stability and Clinical Outcomes
The success of minimally invasive restorations relies on precise bonding and adequate material thickness. Lithium disilicate ceramics demonstrate good fatigue strength even at 0.5 mm thickness [50], while ultra-translucent zirconia offers translucency similar to natural teeth while maintaining strength [54]. The combination of digital design and adhesive techniques not only restores occlusal function and aesthetics but also maintains stability over long-term use [50,54,55]. Clinical studies further support the long-term benefits of integrating adhesion and digitalization. For example, Luna-Dominguez et al. used a fully digital workflow combined with MDP-based bonding protocol to observe restoration edge tightness, color stability, and no shedding or chipping at 2-year follow-up [54].
The combination of adhesive techniques and digital workflows provides minimally invasive, predictable, and long-term stable solutions for tooth wear restoration. Future research should further explore the integration of personalized bonding protocols and digital follow-up systems to achieve more efficient long-term management.