Three-Dimensional Cephalometric Study of Upper Airway Space in Skeletal Class II and III Healthy Patients

ABSTRACT Objectives: To characterize upper airway volume and morphology in patients with different skeletal patterns of Class II malocclusion compared to Class I. Materials and Methods: A total of 197 individuals who had cone-beam computed tomography were allocated into groups according to ANB, SNA, and SNB angles (Class I, Class II maxillary protrusion, Class II mandibular retrusion), each subdivided into hypodivergent, normal, and hyperdivergent. Nasopharynx (NP), oropharynx (OP), and hypopharynx (HP) were assessed with three-dimensional image reconstruction software. Results: Intergroup comparison did not detect significant differences in volume and morphology of NP, OP, and HP. The males displayed larger OP and HP volume than the females. Positive correlations between age and NP, OP, HP volume and between craniocervical angle and OP and HP volume were observed. Linear regression analysis detected a tendency for OP and HP volume to increase as maxillary and mandibular length increased. Conclusions: Upper airway volume and morphology were similar in different skeletal patterns of Class II malocclusion. Actual upper and lower jaw lengths were more closely related to upper airway volume and morphology than the angles that reflected their position relative to the cranial base.

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Uso de propulsor mandibular fixo Flex Developer como recurso no tratamento da Classe II em paciente não colaborador

Orthodontic Science and Practice ◽

10.24077/2020;1352-4051 ◽

2020 ◽

Vol 13 (52) ◽

pp. 40-51

Author(s):

Renato Barcellos Rédua

Keyword(s):

Upper Airway ◽

Class Ii ◽

Class Ii Malocclusion ◽

Skeletal Class ◽

Advantages And Disadvantages ◽

Skeletal Class Ii ◽

High Incidence ◽

Therapeutic Alternatives ◽

Smile Aesthetics ◽

Treatment Alternatives

Class II malocclusion has a high incidence in the population, which may compromise smile aesthetics, occlusion function and stability. Skeletal Class II may affect facial aesthetics and upper airway volume. Class II malocclusion is routinely associated with skeletal Class II condition, having as treatment alternatives the use of Extra Buccal Appliance (EBA) or removable or fixed propulsor appliance. This article describes a case of a patient who did not accept the use of EBA and so it was fitted a Flex Developer propulsor for Class II correction and discussed the advantages and disadvantages of therapeutic alternatives for Class II correction.

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Perioral soft tissue evaluation of skeletal Class II Division 1: A lateral cephalometric study

American Journal of Orthodontics and Dentofacial Orthopedics ◽

10.1016/j.ajodo.2015.03.033 ◽

2015 ◽

Vol 148 (3) ◽

pp. 405-413 ◽

Cited By ~ 7

Author(s):

Young-Joo Lee ◽

Jong-Tae Park ◽

Jung-Yul Cha

Keyword(s):

Soft Tissue ◽

Class Ii ◽

Skeletal Class ◽

Skeletal Class Ii ◽

Division 1 ◽

Cephalometric Study ◽

Class Ii Division 1

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Nonsurgical and nonprosthetic camouflage treatment of skeletal Class II open bite with bilaterally missing lower first molars

The Angle Orthodontist ◽

10.2319/030718-189.1 ◽

2018 ◽

Vol 89 (3) ◽

pp. 505-517. ◽

Cited By ~ 1

Author(s):

Tung Nguyen ◽

Eui Seon Baek ◽

Soonshin Hwang ◽

Kyung-Ho Kim ◽

Chooryung J. Chung

Keyword(s):

Treatment Outcome ◽

Three Dimensional ◽

Class Ii ◽

Open Bite ◽

Third Molars ◽

Second Molar ◽

Skeletal Class ◽

Long Term Stability ◽

Skeletal Class Ii

ABSTRACT This report illustrates the successful nonsurgical and nonprosthetic camouflage treatment of a skeletal Class II open bite malocclusion combined with missing mandibular first molars bilaterally. In the mandible, the second and third molars were uprighted and protracted, substituting for the missing first molars. In the maxilla, anterior bodily retraction and full-arch intrusion were achieved following premolar and second molar extraction, which also induced autorotation of the mandible. The treatment outcome and prognosis were confirmed with three-dimensional superimposition techniques, along with long-term stability.

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Three-dimensional effects of the mini-implant–anchored Forsus Fatigue Resistant Device: A randomized controlled trial

The Angle Orthodontist ◽

10.2319/012515-55.1 ◽

2015 ◽

Vol 86 (2) ◽

pp. 292-305 ◽

Cited By ~ 12

Author(s):

Sherif A. Elkordy ◽

Amr M. Abouelezz ◽

Mona M. Salah Fayed ◽

Khaled H. Attia ◽

Ramy Abdul Rahman Ishaq ◽

...

Keyword(s):

Controlled Trial ◽

Three Dimensional ◽

Class Ii ◽

Control Group ◽

Skeletal Class ◽

Skeletal Class Ii ◽

Skeletal Effects ◽

Implant Anchorage ◽

Mandibular Incisors ◽

Forsus Fatigue Resistant Device

ABSTRACT Objective: To detect three-dimensionally the effects of using mini-implant anchorage with the Forsus Fatigue Resistant Device (FFRD). Materials and Methods: The sample comprised 43 skeletal Class II females with deficient mandibles. They were randomly allocated into three groups: 16 patients (13.25 ± 1.12 years) received FFRD alone (Forsus group), 15 subjects (13.07 ± 1.41 years) received FFRD and mini-implants (FMI group), and 12 subjects (12.71 ± 1.44 years) were in the untreated control group. Three-dimensional analyses of cone beam computed tomographic images were completed, and the data were statistically analyzed. Results: Class I relationship and overjet correction were achieved in 88% of the cases. None of the two treatment groups showed significant mandibular skeletal effects. In the FMI group, significant headgear effect, decrease in maxillary width, and increase in the lower facial height were noted. In the FMI group, retroclination of maxillary incisors and distalization of maxillary molars were significantly higher. Proclination and intrusion of mandibular incisors were significantly greater in the Forsus group. Conclusions: FFRD resulted in Class II correction mainly through dentoalveolar effects and with minimal skeletal effects. Utilization of mini-implant anchorage effectively reduced the unfavorable proclination and intrusion of mandibular incisors but did not produce additional skeletal effects.

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