title: Bonding characteristics of impacted versus erupted permanent teeth.
abstract: Erupted and impacted teeth from young (12 to 24 years of age) and older persons (over 50 years of age) were bonded by a standard technique using etching times of 0, 15, 30, and 60 seconds. Two subgroups of teeth were soaked for 7 days and compared with those in the remainder of the group. Test specimens were loaded in shear to bond failure by means of a testing machine with a 200- kg load cell and a crosshead speed of 5 mm/minute. Results indicated insignificant bond-strength differences between young-impacted and young-erupted teeth for any given etching time. Very small bond-strength differences were found for various etching times (15, 30, and 60 seconds). A significant difference was found between 24-hour soak and 7-day soak for the etching times of 30 and 60 seconds only.
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D001840:Dental Bonding; D003743:Dental Enamel / Q000502:physiology; D006801:Humans; D008875:Middle Aged; D010756:Phosphoric Acids / Q000008:administration & dosage; D013314:Stress, Mechanical; D013997:Time Factors; D014070:Tooth / Q000502:physiology; D014078:Tooth Eruption; D014095:Tooth, Impacted / Q000503:physiopathology
chemical_list: D010756:Phosphoric Acids