title: The relationship between incisal/occlusal wear, dentine hypersensitivity and time after the last acid exposure in vivo.
abstract: OBJECTIVE
  The aim of this study was to investigate the relationship between tooth wear and dentine hypersensitivity on occlusal/incisal tooth surfaces and the time since dietary acid consumption.
  
  
  METHODS
  350 subjects were recruited from hospital and general practice in SE England aged 19-34 years old. The severity of tooth wear and dentine hypersensitivity was calculated on occlusal/incisal tooth surfaces per subject using Basic Erosive Wear Examination (BEWE) and Cumulative Hypersensitivity Index (CHI) scores respectively at each appointment. The CHI score relied on evaporative stimuli applied to each occlusal/incisal tooth surface. The subjects were also asked about the time since their last acidic food or drink consumption.
  
  
  RESULTS
  Tooth wear was recorded in 93% (n=327) of subjects and dentine hypersensitivity was recorded in 56% (n=196) of subjects. A positive statistically significant relationship existed between the severity of tooth wear and severity of dentine hypersensitivity recorded using BEWE and CHI on occlusal/incisal tooth surfaces (p<0.01). Dentine hypersensitivity and tooth wear were correlated with consumption of acidic beverages (p<0.01). The severity of dentine hypersensitivity on occlusal/incisal tooth surfaces was associated with the time since the subject's last acidic food consumption (p<0.01). Among those subjects who consumed an acidic beverage within 60min of their appointment, 87.2% (n=130) had dentine hypersensitivity. Among subjects who had consumed the acidic beverage more than 1h previously, the prevalence of dentine hypersensitivity was 12.8% (n=19).
  
  
  CONCLUSIONS
  The severity of tooth wear on occlusal/incisal tooth surfaces is associated with the dentine hypersensitivity severity. Subjects who consume dietary acidic beverages more recently are more likely to have dentine hypersensitivity.
  
  
  CONCLUSIONS
  Occlusal tooth surfaces suffer erosive, attritive and abrasive tooth wear. Tooth wear is important in the aetiology of dentine hypersensitivity on these surfaces. Dentine hypersensitivity is more likely initiated if subjects consume acidic beverages more recently. This supports clinically the episodic nature of dentine hypersensitivity caused predominately by active erosive tooth wear.
authors.affiliation: King's College London, Dental Institute, Department of Conservative Dentistry, Guy's Hospital, Room 301, Floor 26, Guys Tower Wing, London Bridge, SE1 9RT, UK. Electronic address: ryan.olley@kcl.ac.uk.
authors.forename: Ryan C
authors.initials: RC
authors.lastname: Olley
authors.affiliation: Oral Clinical Research Unit, King's College London, Dental Institute, Guy's Dental Hospital, Room 365, Floor 25, Tower Wing, London Bridge, London SE1 9RT, UK. Electronic address: rebecca.v.moazzez@kcl.ac.uk.
authors.forename: Rebecca
authors.initials: R
authors.lastname: Moazzez
authors.affiliation: Prosthodontics, Kings College London, Dental Institute, Floor 25, Tower Wing, SE1 9RT, UK.
authors.forename: David
authors.initials: D
authors.lastname: Bartlett
mesh_terms: D000143:Acids / Q000009:adverse effects*; D000328:Adult; D003766:Dental Occlusion; D003807:Dentin Sensitivity / Q000139:chemically induced* / Q000150:complications*; D005260:Female; D006801:Humans; D007180:Incisor / Q000187:drug effects* / Q000473:pathology*; D008297:Male; D013997:Time Factors; D019217:Tooth Attrition; D057085:Tooth Wear / Q000139:chemically induced* / Q000150:complications*; D055815:Young Adult
chemical_list: D000143:Acids
keywords: Dentine hypersensitivity; Erosion; Occlusal; Tooth wear