Use of fiberglass CAD-CAM post-and-core for rapid orthodontic extrusion of anterior tooth – Case Report

This report describes the restoration of an anterior fractured tooth with a fiberglass CAD-CAM post-and-core followed by rapid orthodontic extrusion. The post space was prepared, the post-and-core was luted and a interim crown was luted to allow the tooth extrusion through the use of orthodontic buttons and elastic rubber bands. A lithium disilicate glass-ceramic crown was luted and the case was followed up after 6 and 12 months.

A comparative study between the effect of reverse curve of Spee archwires and anterior bite turbos in the treatment of deep overbite cases: A randomized clinical trial

ABSTRACT Objectives To compare deep overbite treatment using 0.016 × 0.022 nickel-titanium lower reverse curve of Spee archwire (LRCA) or metal anterior bite turbos (ABTs). Materials and Methods 48 patients with deep overbite malocclusion were randomly allocated into two groups. Group I (age = 18.4 ± 2.8 years, overbite = 5.8 ± 0.6 mm) was treated with LRCA, while Group II (age = 18.2 ± 3.1 years, overbite = 5.2 ± 0.4 mm) was treated with ABTs bonded to the palatal surface of the upper central incisors. Two cephalograms were taken for each patient, at post-alignment stage (T1) and post-leveling stage (T2). The primary outcomes were the anteroposterior and vertical changes of the lower teeth. The secondary outcomes were the effect on upper incisor inclination and the vertical linear changes of upper teeth, to assess the sagittal and vertical skeletal changes, and to compare the duration of overbite correction. Results 42 of the 48 patients recruited completed the study (21 in each group). At T2, the lower incisors proclined more in Group I (P ≤ .001). Both lower second molars (P ≤ .001) and lower first molars (P = .001) tipped more distally, while the lower first premolar tipped more mesially, in Group I (P < .05). All cusps of both lower molars showed more extrusion in Group II (P < .05) except for the mesial cusp of lower second molars (P = .095). The duration of overbite correction was shorter using the ABTs by 1.7 months (4.85 ± 1.56 and 3.15 ± 0.93 months for Group I and Group II, respectively). Conclusions LRCA causes lower incisor proclination with distal tipping of lower molars, while ABTs result in lower posterior tooth extrusion.

Skeletal and dental changes after lower posterior tooth extrusion in Class II Division 1 deep bite short-faced growing patients

Objectives: The objectives of the study were to investigate the effect of lower posterior tooth extrusion on skeletal and dental changes in Class II division 1 deep bite short-faced growing patients. Materials and Methods: Twenty-two growing patients with Class II/1 malocclusion deep bite/short-face were treated using a pre-adjusted edgewise-fixed appliance. The curve of Spee (COS) was leveled by rectangular wire and posterior vertical elastic. Two consecutive lateral cephalometric radiographs were collected before and after treatment. Changes from the cephalometric analysis were compared with 22 untreated matched subjects during the observation period with independent t-test. Results: The reduction of deep bite from the COS in the treated group was 2.83 mm which was obtained by a greater amount of posterior extrusion (1.37 mm), than anterior intrusion (0.58 mm), and lower facial height significantly increased (3.70 mm). The treated group showed significant forward mandibular position from SNB (1.36°), Pg-Nperp (1.53 mm), and the skeletal relationship improved (ANB = −0.88°). The mandibular plane angles (SN-MP and FMA) showed no significant changes during treatment. Dental changes revealed significant decreases in overjet and overbite, whereas the position and inclination of the upper and lower incisors were not significantly different. Conclusions: The increase of lower facial height in Class II deep bite short-faced growing patients was successfully accomplished by lower posterior tooth extrusion with the use of rectangular wire with posterior vertical elastic. The mandibular plane angle did not change during treatment. Class II skeletal relationship improved by the forward position of the mandible in hypo- and normodivergent pattern subjects.

Dental Extrusion with Orthodontic Miniscrew Anchorage: A Case Report Describing a Modified Method

In recent years, the skeletal anchorage through miniscrews has expanded the treatment options in orthodontics (Yamaguchi et al., 2012). We hereby present a modified method for tooth extrusion for cases where crown-lengthening surgery is contraindicated for aesthetic reasons. This modified method uses three orthodontic appliances: a mini-implant, an orthodontic wire, and a bracket. The aim of this case report was to increase the length of the clinical crown of a fractured tooth (tooth 23) by means of an orthodontic extrusion with the modified method of Roth and Diedrich.