Retentive Capacity of Bonded Retainer Vs Vacuum-formed and Combined Bonded-vacuum Retainers

"* After patient finishes orthodontic treatment, the fixed orthodontic appliance will be debonded; finishing and polishing of the enamel surface will be done.~* An alginate impression will be taken to be poured into a working model for fabrication of the Vacuum-formed retainer; 1mm Hard vacuum sheet will be used.~* The retainer will be finished and delivered to the patient.~* The patient will be instructed to wear the retainer night time only and to contact us if any damage occurred to the retainers for immediate replacement; and he will be supplied with a check list to evaluate the compliance and to calculate the wearing hours.~* Another alginate impression will be taken for fabrication of the study model which will later be scanned to obtain the digital model at T0; and a periodontal chart will be filled to record the periodontal status at T0 (before wearing of the retainer)."

"* A multistrand rectangular stainless steel retainer wire will be bonded to the lingual surface of the lower anterior teeth, from the canine-to-canine bonded to all six anteriors; followed by an alginate impression; the impression will be poured into a working model for fabrication of the Vacuum-formed retainer; 1mm Hard vacuum sheet will be used \& it will be finished and delivered to the patient.~* The patient will be instructed to wear the Vacuum retainer night time only and to contact us if any damage occurred to the retainers for immediate replacement or rebonding of the detached parts of the bonded retainer; and will be supplied with a check list to evaluate the compliance and to calculate the wearing hours.~* Another alginate impression will be taken (with the bonded retainer in place) for fabrication of the study model which will later be scanned to obtain the digital model at T0; and a periodontal chart will be filled to record the periodontal status at T0."

"* After patient finishes orthodontic treatment, the fixed orthodontic appliance will be debonded; finishing and polishing of the enamel surface will be done.~* A multistrand rectangular stainless steel retainer wire will be bonded to the lingual surface of the lower anterior teeth, from the canine-to-canine bonded to all six anteriors.~* The patient will be instructed to contact us if any damage occurred to the retainers for immediate replacement or rebonding of the detached parts of the retainer.~* An alginate impression will be taken (with the bonded retainer in place) for fabrication of the study model which will later be scanned to obtain the digital model at T0; and a periodontal chart will be filled to record the periodontal status at T0 (at the same visit of the delivery of the bonded retainer)."