Comparison of Bonding Failure Rates of Fixed Lingual Mandibular Retainers in a French Sample Aged 11 or Older, Comparing Prior Enamel Sandblasting With Conventional Pumice Polishing
Comparison of Bonding Failure Rates of Fixed Lingual Mandibular Retainers in a French Sample Aged 11 or Older, Comparing Prior Enamel Sandblasting With Conventional Pumice Polishing
At the completion of orthodontic treatment, the position of the mandibular canines and
 incisors is being maintained on a routine basis by bonding a multi-braided wire retainer onto
 their lingual surfaces. One of the adverse events that might occur with time is the debonding
 of the wire from one or several lower anterior teeth . This event which can unfortunately get
 unnoticed by the patient can lead to unwanted tooth displacement. When the practionner
 detects such a debonding, he has to go through a laborious and lengthy procedure to rebond
 the wire. When on the other hand the patient notices himself such a debonding, he is to call
 in emergency his practitioner to get his retainer repaired. This leads to emergency visits
 that are susceptible to affect adversely his timetable. The prevalence of these bonding
 failures is estimated at 37% at 18 month follow-ups. It has been reported that with prior
 enamel sandblasting, bonding failure rate is reduced to 8% at 24 month follow-ups. However,
 no study has reported yet the debonding rate of lower fixed, comparing wires that have been
 bonded after prior enamel pumicing to those that were put in place after prior enamel
 sandblasting.

 The expected result of this trial is a significantly decrease in bonding failure rate of
 mandibular lingual retainer when enamel surfaces are initially sandblasted compared to the
 ones which are pumiced. This reduction would lower the risk of unwanted tooth movement of
 mandibular incisors and canines after orthodontic treatment and decrease the number of
 emergency appointments for the patient and the practitioner.
Inclusion Criteria:

 -  Minimum of 11 years of age

 -  At completion of fixed orthodontic therapy

 -  Presence of all 6 mandibular canines and incisors

 Exclusion Criteria:

 -  Active decay

 -  Presence of dental restorations

 -  Tooth fracture

 -  Periodontal disease

 -  Structural anomalies affecting the lingual side of the mandibular incisors and canines

 -  Cleft lip and palate

 -  Cranio-facial syndrome

 -  Inability to obtain the patient informed consent