Overview
Occlusal wear of teeth encompasses the progressive loss of tooth structure due to mechanical forces exerted during mastication and other oral activities. This condition can significantly impact both the functional integrity and aesthetic appearance of the dentition. Historical studies comparing hunter-gatherer and agricultural populations reveal that dietary habits and daily activities play pivotal roles in the extent of wear [PMID:18773466]. Modern occupational environments, particularly those involving abrasive materials, also contribute substantially to increased wear among specific populations, such as miners [PMID:3467443]. Understanding the multifaceted causes of occlusal wear is crucial for effective diagnosis, management, and patient counseling.
Pathophysiology
The pathophysiology of occlusal wear is multifaceted, influenced by dietary abrasiveness, chewing patterns, and environmental factors. Hunter-gatherers, characterized by their abrasive diets rich in raw foods and tough textures, exhibit significantly greater occlusal wear compared to agriculturalists who consume more processed foods [PMID:18773466]. This dietary difference underscores the direct impact of food texture on tooth wear. Additionally, the manner in which individuals chew influences wear patterns. Research using jaw tracking devices has shown that a grinding chewing pattern significantly increases wear, particularly in posterior teeth, as measured by Woda's arbitrary scale [PMID:11722722]. This pattern places disproportionate stress on molar and premolar regions, leading to more pronounced wear compared to a chopping pattern.
Biomechanical stresses also play a critical role. Subjects with advanced occlusal wear often demonstrate elevated bite forces, which can lead to increased stress on craniofacial structures, potentially altering their morphology over time [PMID:7879761]. These structural adaptations highlight the interconnectedness between occlusal health and overall craniofacial integrity. Interestingly, certain behaviors, such as chewing snuff, paradoxically increase salivary flow, which can mitigate wear through enhanced lubrication [PMID:1876979]. However, occupational exposures, particularly in mining environments, exacerbate wear due to inhalation of abrasive particles, leading to higher wear rates among miners with prolonged exposure [PMID:3467443].
Epidemiology
The epidemiology of occlusal wear reveals consistent patterns across different populations and occupational groups. Central incisors and first molars consistently show the highest levels of wear, likely due to their prominent role in initial food breakdown and their occlusal surface exposure [PMID:18773466]. Conversely, third molars, often less functional and more prone to extraction, exhibit the least wear. Demographic variability is evident, with studies including diverse adult samples (e.g., 54 adults with varying degrees of wear [PMID:7879761]) highlighting the broad impact across different age and gender groups.
Occupational factors significantly influence wear patterns. Miners, especially those with longer employment durations (5-7 years and over ten years), exhibit statistically higher occlusal wear compared to non-exposed controls, underscoring the occupational risk [PMID:3467443]. Behavioral factors also contribute; among snuff users, occasional or frequent snuff placement between teeth suggests potential exposure to abrasive elements, though the direct impact on wear is nuanced, with increased salivary flow potentially offsetting some wear [PMID:1876979]. These findings emphasize the need for tailored preventive strategies based on individual risk factors.
Clinical Presentation
Clinically, occlusal wear manifests through both aesthetic and functional impairments. Patients may present with collapsed occlusal vertical dimension, leading to aesthetic concerns and functional difficulties such as masticatory inefficiency and temporomandibular joint (TMJ) issues [PMID:36916616]. Surface roughness changes in restorations, particularly with composite resins like Filtek Z250, can exacerbate symptoms such as tooth sensitivity and discomfort, necessitating careful material selection [PMID:25220522]. The eruption order of teeth, dietary habits, and individual behaviors collectively influence wear patterns, with posterior teeth often showing more pronounced wear due to grinding patterns [PMID:18773466].
Psychological factors also play a role. Children with low dental anxiety may experience increased self-reported pain over multiple visits, while those with high anxiety report heightened pain during initial treatments, indicating the importance of managing anxiety in pediatric patients [PMID:18035498]. Specific craniofacial traits, such as vertical direction deviations and reduced gonial angles, are observed in individuals with advanced wear, reflecting biomechanical adaptations to chronic stress [PMID:7879761]. These clinical presentations underscore the comprehensive approach required for diagnosis and management, addressing both structural and psychological aspects.
Diagnosis
Accurate diagnosis of occlusal wear involves a combination of clinical examination and advanced diagnostic tools. Intraoral scanning technologies provide precise digital models of the maxillary and mandibular arches, facilitating detailed assessment and treatment planning [PMID:36916616]. Scanning electron microscopy (SEM) can reveal significant changes in the surface topography of dental materials post-tooth brushing, aiding in the evaluation of restoration wear [PMID:25220522]. Traditional methods, such as study casts and ordinal scales, remain practical for evaluating wear extent in clinical settings [PMID:7879761]. These diagnostic approaches collectively ensure a thorough understanding of wear patterns and their implications for treatment.
Management
Effective management of occlusal wear requires a multifaceted approach tailored to individual patient needs. Full-mouth restoration using advanced digital workflows, including intraoral scanning, digital design, and fabrication techniques like 3D printing for temporary restorations, followed by definitive restorations such as zirconia crowns, can significantly improve both function and aesthetics [PMID:36916616]. Material selection is crucial; for instance, understanding that certain composites like Filtek P90 exhibit higher surface roughness under wear conditions can guide clinicians in choosing more durable materials [PMID:25220522].
Behavioral modifications are also essential. Patients with grinding patterns may benefit from interventions such as occlusal splints to reduce wear on posterior teeth [PMID:11722722]. Addressing biomechanical stresses, particularly in individuals with elevated bite forces, involves comprehensive orthodontic or prosthodontic adjustments to redistribute occlusal forces [PMID:7879761]. Psychological support, especially for patients with dental anxiety, can improve treatment outcomes and patient compliance [PMID:18035498]. For occupational groups like miners, preventive measures and regular dental screenings can mitigate wear associated with their work environment [PMID:3467443].
Prognosis & Follow-up
The prognosis for patients with occlusal wear varies based on the severity and underlying causes. Early intervention can significantly improve outcomes, preserving both function and aesthetics. However, chronic wear may lead to irreversible structural changes in the craniofacial region, necessitating ongoing management. Follow-up care should focus on monitoring wear progression, adjusting restorations as needed, and addressing any emerging functional or aesthetic issues. Notably, pain perception patterns, such as the strong correlation between initial injection pain and subsequent visits [PMID:18035498], highlight the importance of managing pain effectively to enhance patient compliance and satisfaction during follow-up visits.
Key Recommendations
References
1 Zhivago P, Turkyilmaz I, Yun S. Aesthetic and functional rehabilitation of collapsed occlusal vertical dimension using an advanced digital workflow. Primary dental journal 2023. link 2 Al Khuraif AA. An in vitro evaluation of wear and surface roughness of particulate filler composite resin after tooth brushing. Acta odontologica Scandinavica 2014. link 3 Deter CA. Gradients of occlusal wear in hunter-gatherers and agriculturalists. American journal of physical anthropology 2009. link 4 Versloot J, Veerkamp JSJ, Hoogstraten J. Children's self-reported pain at the dentist. Pain 2008. link 5 Kim SK, Kim KN, Chang IT, Heo SJ. A study of the effects of chewing patterns on occlusal wear. Journal of oral rehabilitation 2001. link 6 Kiliaridis S, Johansson A, Haraldson T, Omar R, Carlsson GE. Craniofacial morphology, occlusal traits, and bite force in persons with advanced occlusal tooth wear. American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics 1995. link70144-3) 7 Magnusson T. Is snuff a potential risk factor in occlusal wear?. Swedish dental journal 1991. link 8 Enbom L, Magnusson T, Wall G. Occlusal wear in miners. Swedish dental journal 1986. link