Effect of maxillary and mandibular extrusion arches on dentoskeletal changes in adults with anterior open bite: a quantitative analysis

Abstract

Objective To quantify dentoskeletal changes accompanying the use of extrusion arches during the treatment of anterior open bite (AOB) in adults. Materials and Methods A total of 23 adult patients with an AOB of −3.05 mm ± 1.27 mm were treated with upper and lower extrusion arches after the alignment phase. Lateral cephalograms were taken before placement of the extrusion arch, immediately after closure of the open bite (T2), and at the end of orthodontic treatment (T3). Data were statistically analyzed using repeated-measures analysis of variance and the Bonferroni post hoc test for pairwise comparisons (α = 0.05). Results Successful closure of AOB, with an overall change in overbite of 4.73 ± 1.93 mm, was achieved in an average of 3.8 months and remained stable at T3. Upper and lower incisors were significantly extruded by 2.05 mm ± 0.72 mm and 2.54 mm ± 1.63 mm, respectively, and significantly retroclined by 6.36° ± 1.63° and 8.45° ± 3.83°, respectively, with a resultant increase in the interincisal angle of 12.80° ± 2.09°. Statistically significant intrusion and mesial tipping (P < .001) of the maxillary and mandibular first molars were observed at T2. Dentoskeletal changes remained stable at T3, except for a significant reduction of the mesial tipping of the maxillary and mandibular first molars. Conclusions The combined use of maxillary and mandibular extrusion arches resulted in significant favorable dentoskeletal changes that led to the successful closure of AOB during a short duration of treatment.

Dentoalveolar effects of skeletally anchored extrusion arch in anterior open bite patients: A prospective clinical trial

“…Regarding extrusion of the anterior teeth, these findings agree with those of Hammad et al 17 The results of this study revealed that there was significant palatal tipping of the maxillary incisors by -5.78±0.77°, and there was no significant change in the inclination of the lower incisors. These results can be explained as there was an uprighting moment produced by the extrusion arch on the upper incisors, 11 effect that is favorable in patients with labial inclination of the maxillary incisors.…”

“…Moreover, this study showed that the interincisal angle increased significantly by 9.94±1.09°, due to the palatal tipping of the anterior teeth. These results were consistent with those of Hammad et al, 17 Atsawasuwan et al, 20 and de Brito Vasconcelos et al 15 As a result of incisor palatal tipping, the overjet reduced significantly by 1.58± 0.5 mm.…”

“…The maxillary first permanent molars were intruded significantly by 0.02±0.03mm, but this amount of intrusion is considered clinically ineffective, and there was no change in the vertical position of the lower first permanent molars. These findings were less than the results reported by Hammad et al, 17 Kim et al, 8 and He et al 25 , who revealed significant intrusion of the maxillary first permanent molars by 0.95mm, 0.66mm, and Regarding soft tissue changes, the results of this study indicated that the upper lip showed a significant retraction tendency toward the E-plane, without a significant change in the position of the lower lip, with a significant increase in the nasolabial angle. These results coincide with the results of Cozza et al 26 and Giuntin et al 27 .…”

Assessment of the Treatment Quality of Patients With Functional Disorders of the Dento-Magular Apparatus Combined With the Dentoalveolar Form of Deep Bite

“…Відомо, кількість дорослого населення, що звертається за ортодонтичною допомогою, протягом останніх років за даними авторитетних вчених зросла на 17-23 % та має тенденцію до збільшення [1,2]. Глибокий прикус -достатньо розповсюджена патологія, яка складає близько до 20 % усіх зубо-щелепних аномалій.…”

“…Важливість цього питання обумовлена значною розповсюдженістю даної анормальності, регулярним під-вищенням зафіксованих звернень пацієнтів, різноликістю клінічних проявів, значними труднощами при проведенні діагностики, диференційної діагностики та лікування, що потребує ґрунтовного міждисциплінарного рішення [5,6]. Останнім часом спостерігається тенденція до зростання кількості стоматологічних пацієнтів, які скаржаться на порушення функціональної оклюзії, яка спричинена реконструктивними реставраціями при наявній патології прикусу [7,8].…”