The purpose of this study was to determine the effect of auxiliary intrusion cantilevers used with resilient archwires during the leveling and alignment phase in intruding lower incisors.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
NONE
Enrollment
27
Patients received a full set of 0.022- inch slot brackets (Mini 2000, Ormco) with Roth prescription. Lower first molars received double tubed bands while 2nd molars received single bondable tubes. Leveling and alignment phase then started with 0.014 inch NiTi wires engaging all teeth and synched behind 2nd molars. Two 0.017" x 0.025" TMA (Ormco) sectional wires were attached to auxiliary tubes on 1st molars with tip back bends mesial to the molars and attached with hooks distal to lateral incisors on top of basal leveling arch wire. Amount of intrusive force was measured to range between 20 and 40 grams per side. Basal leveling arches were upgraded whenever needed. All patients were assessed after 6 months of treatment.
Patients received a full set of 0.022- inch slot brackets (Mini 2000, Ormco) with Roth prescription, 1st and 2nd molars received tubes or bands according to each patient's further needs Lower arch was leveled and aligned with sequential wires starting with 14 NiTi and upgraded when needed. All patients were assessed after 6 months of treatment.
Faculty of Dentistry, Alexandria University
Alexandria, Egypt
Overbite
Distance between incisal edges of upper and lower incisors measured on lateral cephalometric x-rays
Time frame: six months
True incisor intrusion
Perpendicular distance between the center of resistance of mandibular central incisor and the mandibular plane measured on lateral cephalometric x-rays
Time frame: six months
Proclination of lower incisors
Angle formed by the long axis of mandibular central incisor and mandibular plane measured on lateral cephalometric x-rays
Time frame: six months
Lower incisor intrusion and proclination
Perpendicular distance between the incisal edge of the lower central incisor and mandibular plane measured on lateral cephalometric x-rays
Time frame: six months
Lower incisor intrusion
Perpendicular distance between the apex of the lower central incisor and mandibular plane measured on lateral cephalometric x-rays
Time frame: six months
Extrusion of lower first molar
Perpendicular distance between the mesio-buccal cusp tip of the lower first molar and mandibular plane measured on lateral cephalometric x-rays
Time frame: six months
Distal tip of lower first molar
Angle formed between the long axis of lower 1st molar and mandibular plane measured on lateral cephalometric x-rays
Time frame: six months
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Depth of curve of Spee
Measured on dental casts by summing the right and left side maximum depths from a flat plane formed by the tips of the mandibular incisors anteriorly and the distal cusp tips of the second molars posteriorly
Time frame: six months
Depth of gingival sulcus
The sulcus depth was measured using Michigan O periodontal probe.
Time frame: six months
Width of keratinized gingiva
Measured with the aid of periodontal probe from the free gingival margin to the mucogingival junction.
Time frame: six months
Root resorption of lower incisors
Length of lower incisor roots was compared in before- and after-periapical radiographs taken with a paralleling technique.
Time frame: six months