%0 Journal Article
%T Light-curing of orthodontic bracket adhesive by transillumination through dentine and enamel
%A Erika M£¿kinen
%A Juha Varrela
%A Lippo Lassila
%A Pekka Vallittu
%J Biomaterial Investigations in Dentistry
%D 2019
%R https://doi.org/10.1080/26415275.2019.1632709
%X Abstract 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£¿<£¿.05). An adequate DF was achieved through transillumination both in incisors and premolars, but in premolars, the DC% remained low compared to conventionally cured brackets. Most of the bracket failures resulted from weak bracket-adhesive bond
%U https://www.tandfonline.com/doi/full/10.1080/26415275.2019.1632709