Abstract
BackgroundMiniscrews are effective devices for performing upper incisor intrusion. Different mechanics can be applied depending on the treatment objectives. This study aimed to evaluate the efficacy of one or two anterior miniscrews for upper incisor correction in cases of overbite and angulation in adult patients.MethodsForty-four adults with deep overbite were divided into two groups: group 1 was treated with one miniscrew between upper central incisors and group 2 with two miniscrews between upper lateral incisors and canines. Incisor intrusion and length were measured from lateral cephalograms before treatment, after treatment and at least 12 months into retention (T0, T1 and T2). Forces were applied (90 g) from the miniscrews to the archwire using elastomeric chains. ANOVA analysis was used to determine whether differences between evaluation times were statistically significant.ResultsMean root resorption was 2.15 ± 0.85 mm, which ceased after active treatment. Overbite mean correction was − 3.23 ± 1.73 mm with no statistically significant relapse. Overbite correction and incisor intrusion were significantly greater in group 2 (− 3.80 ± 1.43 versus − 2.75 ± 1.63 for OB and 8.19 ± 3.66 versus 5.69 ± 2.66 for intrusion). Resorption and overbite correction were positively related. No counterclockwise rotation of the mandibular plane was observed.ConclusionsOverbite correction can be performed by means of upper incisor intrusion without rotation of the mandibular plane. Correction of upper incisor intrusion and overbite is greater in patients treated with two miniscrews. The increase in upper incisor buccal angulation is greater with one miniscrew. Root resorption is positively related to the extent of intrusion. Stability is satisfactory regardless of whether one or two miniscrews are used.
Highlights
Vertical malocclusions with deep overbite can be treated with orthodontics alone or in combination with orthognathic surgery
Ten female and six male patients with a mean age of 35.6 ± 6.3 years comprised the group with one miniscrew, while the group treated with two miniscrews was made up of 14 females and 14 males subjects with a mean age of 34.6 ± 3.48
Mean total treatment duration was 23.3 ± 7.7 months, and miniscrews were used for a mean period of 6.1 months ± 1.2
Summary
Vertical malocclusions with deep overbite can be treated with orthodontics alone or in combination with orthognathic surgery. When surgical treatment is not an option because of the patient’s refusal to undergo surgery, or because no maxillary vertical excess is present, the use of miniscrews is a treatment option that offers an effective method for attaining maxillary incisor intrusion and correcting the gummy smile [2]. Intrusion of upper and lower incisors, reducing overbite, can be achieved by placing miniscrews in anterior interradicular areas and applying the appropriate orthodontic mechanics. Miniscrews are effective devices for performing upper incisor intrusion. This study aimed to evaluate the efficacy of one or two anterior miniscrews for upper incisor correction in cases of overbite and angulation in adult patients
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