title: Microarchitectural pattern of pristine maxillary bone.
abstract: OBJECTIVE
  There is limited evidence available on the influence of location on bone density in the maxilla. Therefore, this study was aimed at comparing the microarchitecture of bone harvested from different nonatrophic maxillary locations.
  
  
  METHODS
  A total of 37 partially edentulous subjects (aged 48.15 ± 15.85 years) were included in the study. A bone core biopsy specimen was obtained from one site per patient at the planned implant surgery location. Thirty-four specimens were used for microcomputed tomography (micro-CT) analysis. Mann-Whitney U tests (independent samples) were performed to determine whether the distributions of the six bone-related parameters showed significant differences between sexes and site locations. Study sites were categorized as either anterior (incisors and canines) or posterior (premolars and molars). The possible associations among variables (bone volume fraction [BV/TV], age, and five bone-related parameters) were examined using the Spearman rank correlation test.
  
  
  RESULTS
  The mean BV/TV values showed no significant difference between the maxillary anterior (46.93 ± 26.2) and posterior (51.90 ± 28.42) locations. Statistically significant positive correlations were identified between BV/TV and trabecular thickness (Tb.Th) (r = 0.6, P < .001) and between BV/TV and trabecular number (Tb.N) (r = 0.49, P = .006). Statistically significant negative correlations were found between BV/TV and trabecular spacing (Tb.Sp) (r = -0.65, P < .001), between BV/TV and trabecular pattern factor (Tb.Pf) (r = -0.7, P <.001), and between BV/TV and the structural model index (SMI) (r = -0.68, P <.001). However, no correlations between BV/TV and age or sex were found.
  
  
  CONCLUSIONS
  Bone density was independent of the anatomical location, assessed by micro-CT in the pristine nonatrophic maxillary bone. Studies with a larger sample size and different population should be conducted to validate the findings of the current project.
authors.forename: Alberto
authors.initials: A
authors.lastname: Monje
authors.forename: Raúl
authors.initials: R
authors.lastname: González-García
authors.forename: Florencio
authors.initials: F
authors.lastname: Monje
authors.forename: Hsun-Liang
authors.initials: HL
authors.lastname: Chan
authors.forename: Pablo
authors.initials: P
authors.lastname: Galindo-Moreno
authors.forename: Fernando
authors.initials: F
authors.lastname: Suarez
authors.forename: Hom-Lay
authors.initials: HL
authors.lastname: Wang
mesh_terms: D000328:Adult; D000368:Aged; D015519:Bone Density; D005260:Female; D006801:Humans; D008297:Male; D008437:Maxilla / Q000000981:diagnostic imaging / Q000502:physiology / Q000648:ultrastructure*; D008875:Middle Aged; D012737:Sex Factors; D018709:Statistics, Nonparametric; D055114:X-Ray Microtomography