title: Occlusal tooth wear in Chinese adults with shortened dental arches.
abstract: To assess associations between occlusal tooth wear and shortened dental arches (SDA) in Chinese 40 years and older subjects. From a sample of 1462 urban and rural adults, those presenting with SDA (n = 150) were compared with a control group of 65 randomly selected subjects with complete dentitions (CDA). Occlusal wear was assessed using a modified Smith and Knight index - the occlusal tooth wear index (OWTI) - and analysed using multivariate (logistic) regression. There was no significant effect from SDA on severe occlusal wear (OTWI score 3 or 4: OR = 2.016; 95% CI = 0.960-4.231; P = 0.064). Higher age was associated with severe occlusal wear (P values ≤0.007) and with higher mean OTWI scores; urban had less often severe occlusal wear than rural residents (OR = 0.519; P = 0.008). Higher mean OTWI scores were associated with rural residents, except for anterior teeth. Females had lower mean OTWI score for anterior teeth (effect = -0.153; P = 0.030). Premolars in SDA had higher mean OTWI scores compared with those in CDA (effect = +0.213; P = 0.006). In SDA, more posterior occluding pairs (POPs) were associated with lower mean OTWI sores for anterior teeth (effect: -0.158; P = 0.008) and higher scores for molars (effect: +0.249, P = 0.003). Subjects with SDA or CDA presented comparable occlusal wear, but premolars in SDA tend to have higher probability for having occlusal wear. Fewer numbers of POPs were associated with more wear in anterior teeth.
authors.affiliation: Department of Prosthetic Dentistry and Implantology, Key laboratory of Oral Medicine, School and Hospital of Stomatology, Guangzhou Medical University, Guangzhou City, China.
authors.forename: Q
authors.initials: Q
authors.lastname: Zhang
authors.forename: D J
authors.initials: DJ
authors.lastname: Witter
authors.forename: E M
authors.initials: EM
authors.lastname: Bronkhorst
authors.forename: D W
authors.initials: DW
authors.lastname: Bartlett
authors.forename: N H J
authors.initials: NH
authors.lastname: Creugers
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D044466:Asian People; D016022:Case-Control Studies; D003430:Cross-Sectional Studies; D003724:Dental Arch / Q000503:physiopathology*; D003766:Dental Occlusion; D005260:Female; D006801:Humans; D007576:Jaw, Edentulous, Partially / Q000503:physiopathology*; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D012307:Risk Factors; D012423:Rural Health; D012720:Severity of Illness Index; D019217:Tooth Attrition / Q000503:physiopathology*; D014504:Urban Health
keywords: Chinese adults; dental occlusion; epidem-iologic study; occlusal tooth wear; shortened dental arch