Issue 10.2

Corticotomy Assisted Orthodontics

The use of orthodontic treatment in adult patients is becoming more common and these patients have different requirements especially regarding duration of treatment and facial and dental aesthetics. Theories to increase the rapidity of tooth movement are always being suggested. One such theory is Corticotomy assisted orthodontic treatment.  Alveolar corticotomy is an effective means of accelerating orthodontic treatment. This literature review includes an historical background, biological and orthodontic fundamentals and clinical application and contraindications of this technique. Orthodontic treatment time is reduced with this technique to one-third of that in conventional orthodontics. Corticotomy facilitated orthodontics is promising procedure . Controlled clinical and histological studies are needed to understand the biology of tooth movement with this procedure, the effect on teeth and bone, post-retention stability, quantifying  the volume of mature bone formation, and determining the status of the periodontium and roots after treatment.
Key words: Corticotomy, osteotomy, accelerated orthodontics.

Evaluation of Shear Bond strength between Acid etching , Air Abrasion and Bur abrasion Technique – An in vitro Study.

The present study was to evaluate the shear bond strength of straight wire brackets bonded to pre treated enamel surface prepared by 37% phosphoric acid, air abrasion and bur abrasion. Sixty human premolars extracted for orthodontic purposes were randomly assigned to three groups based on conditioning method: Group 1- conventional etching with 37% phosphoric acid; Group 2- Air abrasion with 50 µm aluminium oxide; and Group 3- Bur abrasion with diamond fissure bur (#330, MANI, Dia-Burs, New jersy). The specimens were fixed in a self cure acrylic blocks and were bonded on prepared enamel using a light-cured composite.  Shear bond strength were measured using a uni- versal testing machine with a crosshead speed of 0.5 mm per second. The statistical comparison of different group was carried out by One-way analysis of variance was used to compare shear bond strengths The results showed that the bond strength of the sandblasted groups was significantly lower than that of the etching groups. It was concluded that sand blasting was favourable than conventional bur preparing enamel surface for bond strength. The result of the study proved acid etching to be acceptable for bonding procedures.