Significance of the Frankfort mandibular plane angle in prosthetic management of partially or completely edentulous patients with Class II malocclusions

Condylar resorption and its incidence at an early age or after orthognathic surgery are well-documented issues, but it is associated with high controversies regarding its etiology and management. Lack of clear understanding of its pathogenies and the limitation of the available evidence inherited for the development of a systematic treatment approach and most previous studies recommended further investigation of the problem. This review aims to cover the problem of condylar resorption and its association with orthodontic and orthognathic surgery as well as to discuss the prospective treatment measure available through the literature. According to the available literature, most previous studies covered the condylar resorption of this type of patient (skeletal class II with high mandibular plane angle) following the orthognathic surgery. However, no studies investigated the long-term condition of the condyles of the involved patient before the surgery. Furthermore, there is no evidence for the orthodontic management of this challenging condition, and most recommendations come from case reports. So, it is crucial to assess the changes that happened to the condyle during the preoperative orthodontic and correlate the finding with what happened after the surgery to provide clear evidence that may help further understand the problem of condylar resorption. This evidence could be beneficial for both patients and clinicians. CT or CBCT images have been regarded as the best choice of detailed diagnosis and investigation of condylar resorption. The incidence of condylar resorption after orthognathic surgery with or without disc repositioning of skeletal class II with high mandibular plane angle is extremely suspected. However, artificial joint replacement is considered a gold standard treatment measure in severe or relapsed cases.

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Dental, skeletal and soft tissue effects of the Distal Jet appliance: A prospective clinical study

Dental Press Journal of Orthodontics ◽

10.1590/2177-6709.24.6.056-064.oar ◽

2019 ◽

Vol 24 (6) ◽

pp. 56-64 ◽

Cited By ~ 1

Author(s):

Rachelle Simões Reis ◽

José F. C. Henriques ◽

Guilherme Janson ◽

Karina Maria Salvatore Freitas ◽

Wilana Moura

Keyword(s):

Soft Tissue ◽

Class Ii ◽

Control Group ◽

Class Ii Malocclusion ◽

Plane Angle ◽

Tissue Effects ◽

Mandibular Plane ◽

Maxillary Incisors ◽

Distal Jet ◽

Mandibular Plane Angle

ABSTRACT Objective: This study evaluated the dental, skeletal and soft tissue effects in Class II malocclusion patients treated with Distal Jet appliance, compared to an untreated control group. Methods: 44 patients with Class II malocclusion were divided into two groups: Group 1 (experimental) - 22 patients, mean age of 12.7 years, treated with the Distal Jet appliance for a mean period of 1.2 years; Group 2 (control) - 22 untreated patients, mean age of 12.2 years, followed by a mean period of 1.2 years. Lateral cephalograms were obtained before treatment (T0) and at the end of the distalization (T1).Independent t test was used to identify intergroup differences. Results: When compared to control group, the Distal Jet produced a significant increase in mandibular plane angle (0.7 ± 2.0o). The maxillary second molars presented distal inclination (6.6 ± 3.8o), distalization (1.1 ± 1.1 mm) and extrusion (1.3 ± 2.1 mm). The maxillary first molars distalized by 1.2 ± 1.4 mm. The maxillary first premolars mesialized by 3.4 ± 1.1 mm. The maxillary incisors showed slight labial tipping of 4.3 ± 4.7o and were protruded by 2.4 ± 1.7 mm. There were no significant changes in the facial profile. The overjet increased 1.5 ± 1.1 mm and overbite had no significant changes. Conclusion: The Distal Jet appliance is effective to distalize the maxillary first molars, but promotes increase in mandibular plane angle, distal inclination, extrusion and distalization of maxillary second molars, mesialization of maxillary first premolars, proclination and protrusion of maxillary incisors, and increase in overjet, when compared to a control group.

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An alternative for the correction of the Class II low mandibular plane angle

Oral Surgery Oral Medicine Oral Pathology ◽

10.1016/0030-4220(89)90344-7 ◽

1989 ◽

Vol 67 (3) ◽

pp. 231-241 ◽

Cited By ~ 18

Author(s):

Anthony G.H. McCollum ◽

Johann P. Reyneke ◽

Larry M. Wolford

Keyword(s):

Class Ii ◽

Plane Angle ◽

Mandibular Plane ◽

Mandibular Plane Angle

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Skeleto-Dental Changes After Camouflage Treatment in Class II division 1 Adult Patients with Average Mandibular Plane Angle

Orthodontic Journal of Nepal ◽

10.3126/ojn.v1i1.9364 ◽

2011 ◽

Vol 1 (1) ◽

pp. 31-35

Author(s):

Dashrath Kafle ◽

Saruba Ulrich

Keyword(s):

Statistical Significance ◽

Class Ii ◽

Plane Angle ◽

Mandibular Plane ◽

Division 1 ◽

Molar Teeth ◽

Incisor Retraction ◽

Pre Treatment ◽

Mandibular Plane Angle ◽

Class Ii Division 1

Objective: To assess the skeleto-dental changes in adult Class II Division 1 patients with average mandibular plane angle after camouflage orthodontic treatment by premolars extraction. Materials and Method: Total 30 adult female patients, aged between 20-40 years with Class II Division 1 malocclusion with average mandibular plane angle (Mp-SN: 30-38) were selected for the study. Pre-treatment and post-treatment cephalographs were traced and different measurements are derived from skeletal and dental landmarks. Statistical analysis was done by paired t-test using SPSS software version 16.00. Results: SNA, SNB and ANB angles were reduced significantly. The maxillary length was also decreased significantly. However mandibular dimension was not changed significantly after camouflage treatment. The upper and lower incisors were significantly intruded whereas upper molar was slightly intruded and lower molar was significantly extruded. Antero-posteriorly, incisors were retracted significantly. Upper molars had negligible mesial movement however lower molars had moved mesially with statistical significance. Conclusion: During camouflage treatment care should be taken on incisor retraction. The vertical control of the molar teeth is important during the treatment period to avoid worsening of the facial proportion.

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Dentoskeletal and aesthetic effects of mandibular protraction appliance (MPA) using Ricketts analysis

Revista de Odontologia da UNESP ◽

10.1590/1807-2577.05717 ◽

2018 ◽

Vol 47 (1) ◽

pp. 7-11

Author(s):

Marcelo CHACON ◽

José Fernando Castanha HENRIQUES ◽

Mario VEDOVELLO FILHO ◽

Carolina Carmo de MENEZES ◽

Silvia Amélia Scudeler VEDOVELLO ◽

...

Keyword(s):

Class Ii ◽

Molar Ratio ◽

Plane Angle ◽

Cross Sectional ◽

Facial Profile ◽

Fixed Appliance ◽

Significance Level ◽

Anterior Displacement ◽

Mandibular Plane ◽

Mandibular Plane Angle

Abstract Objective This study was designed to evaluate the skeletal, dental and soft tissue effects of mandibular deficiency treatment with the mandibular protraction appliance (MPA) using 12 factors of the Ricketts analysis. Material and method This cross-sectional retrospective study sample consisted of a group (n = 27), with Class II malocclusion, convex facial profile, increased horizontal trespass and mandibular deficiency, with initial mean age of 12.27 and final of 15.18 years, treated with fixed appliance combined with the MPA, in an average time of 2.9 years. Initial and final radiographs were investigated using Ricketts analysis. The dependent t-test was used to compare the initial and final phases of the MPA group, with a significance level of 5%. Result Statistically significant differences were observed for dental changes such as retrusion (p=0.000) and palatal inclination of the maxillary incisors (p=0.000); protrusion (p=0.000) and buccal inclination of the mandibular incisors (p=0.000); increased interincisal angle (p=0.002) and improved molar ratio (p=0.003). There was also a restriction of the anterior displacement of the maxilla (p=0.000) and a decrease in the mandibular plane angle (p=0.024). The variable inferior labial protrusion with significance (p=0.000), reiterated the improvement in the profile. Conclusion The effects of MPA on correction of malocclusion Class II, verified by Ricketts analysis occurred predominantly by dentoalveolar changes, decrease in the Mandibular Plane Angle, and restriction of anterior displacement of the maxilla, which contributed to the improvement in the patient's profile.

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