Three-Dimensional Evaluation Of The Intrusive Effects Of Usage Of Single Miniscrew Versus Two In Correcting Anterior Deep Bite With Gummy Smile: Double Armed Randomized Trial

Abstract

Deep over bite with gummy smile can be treated with orthodontics only or combination with orthognathic surgery. the use of miniscrews is a treatment option that offers an effective method for obtaining maxillary dento-alveolar intrusion and correction of the gummy smile. Aim of the study This study aimed to compare one anterior miniscrew versus two anterior miniscrews for correcting deep overbite with gummy smile using cone beam computerized tomography. Methods thirty-two adults with deep overbite and gummy smile were divided into two groups: group A was treated with one miniscrew between upper central incisors and group B with two miniscrews between upper lateral incisors and canines. Incisor intrusion was measured from CBCT before treatment and six months after intrusion. Forces were applied ranged from (6o to 80 g) from the miniscrews to the archwire using elastomeric chains. Results Significant intrusion in both groups was observed. Average intrusion of upper incisors in group A was almost 1.5 mm. while in group B the average intrusion was almost 3.5 mm. Conclusions  Both single and double mini-screws are significant to perform incisor intrusion  The amount of intrusion while using two mini-screws more than the amount of intrusion while using single mini-screw