Root resorption associated with maxillary buccal segment intrusion using variable force magnitudes:

Abstract

Objectives To compare the root resorption resulting from miniscrew-supported maxillary posterior dentoalveolar intrusion using two different force magnitudes. Materials and Methods: Adult patients with skeletal open bite, indicated for maxillary posterior dentoalveolar intrusion, were recruited and randomly assigned to the comparison or intervention groups. The comparison group involved applying 200 g of intrusive force per segment, which measured 20 g per root, while this force was 400 g per segment in the intervention group, measuring 40 g per root. Results Twenty participants were included in the final analysis after 2 patients dropped out, 1 in each group, to end up with 10 subjects (200 roots) per group. There was statistically significant root resorption of 0.84 ± 0.96 mm and 0.93 ± 1.00 mm in the comparison and the intervention groups, respectively. However, there was no statistically significant difference between the groups. Conclusions Root resorption inevitably took place in association with orthodontic intrusion. However, increasing the magnitude of the intrusive force did not increase the amount of root resorption, either statistically or clinically.

Three-dimensional assessment of the favorability of maxillary posterior teeth intrusion in different skeletal classes limited by the vertical relationship with the maxillary sinus floor

“…Skeletal open bite malocclusion is considered the most challenging malocclusion with respect to its treatment as well as stability [ 5 ]. One of the most common protocols to correct this malocclusion is by intruding posterior maxillary teeth [ 6 ]. Two main limiting factors for such treatment that might result in apical root resorption of the intruded teeth exist: (1) concentrated orthodontic force over a small apical surface area and, (2) proximity of the teeth to the maxillary sinus with its cortical bone lining.…”

Effect of maxillary molar intrusion on surrounding bone density during treatment of anterior open bite

“…Whereas the outcomes of the study indicated that the alveolar bone density of left first permanent molars had statistically significant decrease (461.02±162.29 HU) and non-significant decrease (59.43±179.72 HU) in the buccal and palatal side, respectively. Table (2,4,6) result, CBCT was utilized to assess bone density in this investigation. In the current study there was no statistical difference in bone density between male and female patients that were allocated.…”

“…Furthermore, the bone density, in the current study, was assessed at T1 and T2, T2 was determined to be on average period of 4.5 months for the range (3-6) months. This range is the time needed to achieve total molar intrusion with TADs as a treatment modality for AOB management [2,10,16].…”

Vertical and Orovestibular Forces Generated by Beta-Titanium and Stainless-Steel Rectangular Wires in Labial and Fully Customized Lingual Bracket Systems

“…Histological and metabolic pulp changes have been observed in patients under orthodontic treatment [2,34]. Moreover, apical root resorption (ARR) has been associated with intrusion forces [35,36]. Risk factors, such us the force magnitude, the age of the patient, the tooth type, the treatment duration and the range of movement, should be taken into consideration [36][37][38].…”

“…Moreover, apical root resorption (ARR) has been associated with intrusion forces [35,36]. Risk factors, such us the force magnitude, the age of the patient, the tooth type, the treatment duration and the range of movement, should be taken into consideration [36][37][38]. Variances observed between activations on the same axis (i.e., between intrusion and extrusion or oral and vestibular activation) have multifactorial etiology.…”