Light-curing of orthodontic bracket adhesive by transillumination through dentine and enamel

摘要

Bonding properties of light-curing adhesive cured by transillumination through the tooth were compared to those achieved by the conventional technique. The study analyzed the degree of cure (DC%), debonding force (DF) and adhesive remnant index (ARI) when light was transmitted through dental hard tissues.Slices of dentin and enamel of 1?mm in thickness were combined with total thicknesses of 3 or 4?mm to simulate tooth structure without the pulp tissue. DC% with curing time of 20?s, 40?s and 60?s and irradiance power was measured for each group (n ?=?5). Brackets were bonded using transillumination on extracted incisors (n ?=?6) and premolars (n ?=?10), and DF was measured and ARI was scored.No statistical difference was found in light transmission between the simulated samples and incisors (p >?.05). Increasing the curing time from 40?s to 60?s enhanced the DC% only in premolars (p ?