title: Correlations of noncarious cervical lesions and occlusal factors determined by using pressure-detecting sheet.
abstract: OBJECTIVE
  The purpose of this clinical study was to examine the relationships of v-shaped noncarious cervical lesion (NCCL) formation with occlusal factors.
  
  
  METHODS
  A total of 159 male self-defense force officials with a mean age of 36.2 years participated in this study. All present teeth were examined for the presence and type of NCCL using the Tooth Wear Index (TWI). The subjects were then interviewed about bruxing and toothbrushing habit. Finally, occlusal force, occlusal contact area and average pressure were measured using a pressure-detecting sheet. Subject-level logistic regression was carried out to assess the associations of factors with presence of v-shaped NCCL teeth. Subjects without v-shaped NCCL were designated as control subjects.
  
  
  RESULTS
  Totally, 4518 teeth were examined. Seventy-eight subjects (49.1%) had one or more teeth with typical v-shaped NCCL (259 teeth). The number of teeth with v-shaped NCCL of grade 2 (defect less than 1mm in depth) was 195 (4.3%), and the number of teeth with v-shaped NCCL of grade 3 (defect 1-2mm in depth) was 54 (1.2%). The prevalence of teeth with v-shaped NCCL was significantly higher in the maxilla than in the mandible. Most of the NCCL teeth were premolars. There was no significant difference between teeth with NCCL on the right side and those on the left side. Subject-level logistic regression analysis revealed that age (OR=1.11), toothbrushing pressure (400g, OR=2.43) and occlusal contact area (>23.0mm(2), OR=4.15) were associated with the presence of NCCL teeth.
  
  
  CONCLUSIONS
  It is concluded that aging, toothbrushing pressure and occlusal contact area are associated with the presence of NCCLs.
authors.affiliation: Department of Preventive Dentistry, Division of Oral Health Science, Hokkaido University Graduate School of Dental Medicine, Nishi 7, Kita 13, Kita-ku, Sapporo 060-8586, Japan. jtake@den.hokudai.ac.jp
authors.forename: Junji
authors.initials: J
authors.lastname: Takehara
authors.forename: Tomotsugu
authors.initials: T
authors.lastname: Takano
authors.forename: Rahena
authors.initials: R
authors.lastname: Akhter
authors.forename: Manabu
authors.initials: M
authors.lastname: Morita
mesh_terms: D000328:Adult; D001732:Bite Force; D002012:Bruxism / Q000150:complications*; D003430:Cross-Sectional Studies; D003743:Dental Enamel / Q000473:pathology; D003769:Dental Occlusion, Traumatic / Q000150:complications*; D007839:Functional Laterality; D006801:Humans; D007574:Jaw Relation Record; D016015:Logistic Models; D008297:Male; D008334:Mandible; D008437:Maxilla; D014072:Tooth Abrasion / Q000145:classification / Q000209:etiology / Q000473:pathology; D019237:Tooth Cervix / Q000473:pathology*; D014077:Tooth Erosion / Q000145:classification / Q000209:etiology* / Q000473:pathology; D014099:Toothbrushing / Q000009:adverse effects; D055815:Young Adult