Cephalometric Evaluation of a Clear Mandibular Advancement Appliance Based on the Twin-block Design
NCT ID: NCT03824574
Last Updated: 2019-01-31
Study Results
The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.
Basic Information
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COMPLETED
NA
20 participants
INTERVENTIONAL
2016-09-20
2018-03-04
Brief Summary
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Detailed Description
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Conditions
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Keywords
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Study Design
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NA
SINGLE_GROUP
TREATMENT
NONE
Study Groups
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Treatment arm
Subjects receiving the clear mandibular advancement appliance
Clear Mandibular Advancement Appliance
Clear Mandibular Advancement Appliance for treatment of skeletal class II patients with retrognathic mandible
Interventions
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Clear Mandibular Advancement Appliance
Clear Mandibular Advancement Appliance for treatment of skeletal class II patients with retrognathic mandible
Eligibility Criteria
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Inclusion Criteria
2. Chronological age: All recruited subjects were between the ages of 8-12 years.
3. Anteroposterior skeletal relationship: Subjects with skeletal Class II malocclusion with normal maxilla and retrognathic mandible were selected. This was confirmed using lateral cephalometric radiographic analysis with the following parameters: decreased effective mandibular length (Co-Gn) according to McNamara composite , SNB\<78, SNA=82+2.
4. Dental characteristics:
* Angle Class II molar relationship ranging from edge to edge to full unit Class II.
* Overjet ranging between 5-10 mm.
* Absence of posterior crossbite and/or tendency for posterior crossbite.
5. Skeletal maturation stage: The growth stage for all subjects was selected to be before or at the prepubertal growth spurt. This was confirmed by cervical vertebral maturation analysis from the lateral cephalometric radiograph. The cervical vertebrae maturation stage required was Cervical Vertebrae Maturation stage 2-3 according to the cervical vertebrae maturation index by Baccetti et al. allowing sufficient time before the end of the growth spurt.
6. No previous history of orthodontic treatment.
7. Absence of systemic diseases affecting growth or craniofacial development. -
Exclusion Criteria
8 Years
12 Years
FEMALE
No
Sponsors
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Ain Shams University
OTHER
Responsible Party
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Ahmed Mostafa Zaky
Lecturer of Orthodontics
References
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Jena AK, Duggal R, Parkash H. Skeletal and dentoalveolar effects of Twin-block and bionator appliances in the treatment of Class II malocclusion: a comparative study. Am J Orthod Dentofacial Orthop. 2006 Nov;130(5):594-602. doi: 10.1016/j.ajodo.2005.02.025.
Teuscher U. A growth-related concept for skeletal class II treatment. Am J Orthod. 1978 Sep;74(3):258-75. doi: 10.1016/0002-9416(78)90202-6.
Lv Y, Yan B, Wang L. Two-phase treatment of skeletal class II malocclusion with the combination of the twin-block appliance and high-pull headgear. Am J Orthod Dentofacial Orthop. 2012 Aug;142(2):246-55. doi: 10.1016/j.ajodo.2010.12.024.
O'Brien K, Macfarlane T, Wright J, Conboy F, Appelbe P, Birnie D, Chadwick S, Connolly I, Hammond M, Harradine N, Lewis D, Littlewood S, McDade C, Mitchell L, Murray A, O'Neill J, Sandler J, Read M, Robinson S, Shaw I, Turbill E. Early treatment for Class II malocclusion and perceived improvements in facial profile. Am J Orthod Dentofacial Orthop. 2009 May;135(5):580-5. doi: 10.1016/j.ajodo.2008.02.020.
Tulloch JF, Phillips C, Koch G, Proffit WR. The effect of early intervention on skeletal pattern in Class II malocclusion: a randomized clinical trial. Am J Orthod Dentofacial Orthop. 1997 Apr;111(4):391-400. doi: 10.1016/s0889-5406(97)80021-2.
Cozza P, Baccetti T, Franchi L, De Toffol L, McNamara JA Jr. Mandibular changes produced by functional appliances in Class II malocclusion: a systematic review. Am J Orthod Dentofacial Orthop. 2006 May;129(5):599.e1-12; discussion e1-6. doi: 10.1016/j.ajodo.2005.11.010.
Baccetti T, Franchi L, Toth LR, McNamara JA Jr. Treatment timing for Twin-block therapy. Am J Orthod Dentofacial Orthop. 2000 Aug;118(2):159-70. doi: 10.1067/mod.2000.105571.
Clark WJ. The twin block technique. A functional orthopedic appliance system. Am J Orthod Dentofacial Orthop. 1988 Jan;93(1):1-18. doi: 10.1016/0889-5406(88)90188-6. No abstract available.
Toth LR, McNamara JA Jr. Treatment effects produced by the twin-block appliance and the FR-2 appliance of Frankel compared with an untreated Class II sample. Am J Orthod Dentofacial Orthop. 1999 Dec;116(6):597-609. doi: 10.1016/s0889-5406(99)70193-9.
Trenouth MJ. Cephalometric evaluation of the Twin-block appliance in the treatment of Class II Division 1 malocclusion with matched normative growth data. Am J Orthod Dentofacial Orthop. 2000 Jan;117(1):54-9. doi: 10.1016/s0889-5406(00)70248-4.
Mills CM, McCulloch KJ. Posttreatment changes after successful correction of Class II malocclusions with the twin block appliance. Am J Orthod Dentofacial Orthop. 2000 Jul;118(1):24-33. doi: 10.1067/mod.2000.104902.
Singh GD, Hodge MR. Bimaxillary morphometry of patients with class II division 1 malocclusion treated with twin block appliances. Angle Orthod. 2002 Oct;72(5):402-9. doi: 10.1043/0003-3219(2002)0722.0.CO;2.
Schaefer AT, McNamara JA Jr, Franchi L, Baccetti T. A cephalometric comparison of treatment with the Twin-block and stainless steel crown Herbst appliances followed by fixed appliance therapy. Am J Orthod Dentofacial Orthop. 2004 Jul;126(1):7-15. doi: 10.1016/j.ajodo.2003.06.017.
O'Brien K, Wright J, Conboy F, Sanjie Y, Mandall N, Chadwick S, Connolly I, Cook P, Birnie D, Hammond M, Harradine N, Lewis D, McDade C, Mitchell L, Murray A, O'Neill J, Read M, Robinson S, Roberts-Harry D, Sandler J, Shaw I. Effectiveness of treatment for Class II malocclusion with the Herbst or twin-block appliances: a randomized, controlled trial. Am J Orthod Dentofacial Orthop. 2003 Aug;124(2):128-37. doi: 10.1016/s0889-5406(03)00345-7.
Flores-Mir C, Major PW. Cephalometric facial soft tissue changes with the twin block appliance in Class II division 1 malocclusion patients. A systematic review. Angle Orthod. 2006 Sep;76(5):876-81. doi: 10.1043/0003-3219(2006)076[0876:CFSTCW]2.0.CO;2.
Khoja A, Fida M, Shaikh A. Cephalometric evaluation of the effects of the Twin Block appliance in subjects with Class II, Division 1 malocclusion amongst different cervical vertebral maturation stages. Dental Press J Orthod. 2016 Jun;21(3):73-84. doi: 10.1590/2177-6709.21.3.073-084.oar.
Mills CM, McCulloch KJ. Treatment effects of the twin block appliance: a cephalometric study. Am J Orthod Dentofacial Orthop. 1998 Jul;114(1):15-24. doi: 10.1016/s0889-5406(98)70232-x.
Other Identifiers
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AinShamsUOrthodontics
Identifier Type: -
Identifier Source: org_study_id