scholarly journals Cephalometric comparison of adult anterior open bite treatment using clear aligners and fixed appliances

2018 ◽  
Vol 89 (1) ◽  
pp. 3-9 ◽  
Author(s):  
Bella Shen Garnett ◽  
Kimberly Mahood ◽  
Mai Nguyen ◽  
Aliaa Al-Khateeb ◽  
Siqi Liu ◽  
...  
Keyword(s):  
Vertical Dimension ◽  
Open Bite ◽  
Plane Angle ◽  
Anterior Open Bite ◽  
Treatment Groups ◽  
Mandibular Plane ◽  
Fixed Appliances ◽  
Clear Aligner ◽  
Cephalometric Measurements ◽  
Mandibular Plane Angle

ABSTRACT Objectives: To compare fixed appliances and clear aligner therapy in correcting anterior open bite and in controlling the vertical dimension in adult patients with hyperdivergent skeletal patterns. Materials and Methods: In this retrospective study, two treatment groups of adult (≥18 years old) hyperdivergent patients (mandibular plane angles of ≥38°) with anterior open bites were included: 17 fixed appliance patients and 36 clear aligner patients. Thirteen cephalometric measurements representing the vertical dimension were reported for each group. A two-sample t-test was used to assess differences in changes in mandibular plane angle and overbite between the two treatment groups. Results: There were no statistical differences found in the magnitude of overbite correction and the changes in any of the cephalometric measurements for vertical control. The clear aligner group showed a slightly greater amount of lower incisor extrusion (P = .009). The main mechanism of open bite correction was similar between the two treatment groups and was accomplished through retroclination of the upper and lower incisors while maintaining the vertical position of the upper and lower molars. Conclusions: Cephalometric comparison of anterior open bite correction and changes in the mandibular plane angle associated with use of clear aligners and fixed appliances did not demonstrate statistically significant differences in adult hyperdivergent patients.

scholarly journals Cephalometric evaluation of changes in vertical dimension and molar position in adult non-extraction treatment with clear aligners and traditional fixed appliances

2021 ◽  
Vol 26 (4) ◽  
Author(s):  
Hailee RASK ◽  
Jeryl D. ENGLISH ◽  
Clark COLVILLE ◽  
Fred Kurtis KASPER ◽  
Ronald GALLERANO ◽  
...  
Keyword(s):  
Cranial Base ◽  
Vertical Dimension ◽  
Open Bite ◽  
Plane Angle ◽  
Fixed Appliance ◽  
Facial Height ◽  
Mandibular Plane ◽  
Fixed Appliances ◽  
Clear Aligner ◽  
Lower Molar

ABSTRACT Introduction: Orthodontists have been using clear aligners to treat malocclusions, and one potential effect of treatment with orthodontic aligners is the intrusion and/or resists extrusion of the posterior teeth. This “bite-block effect” is primarily anecdotal due to the frequent occurrence of posterior open bites in patients after clear aligner therapy. Objective: The purpose of this study was to compare changes promoted by clear aligners and traditional fixed appliances in cephalometric measurements of the vertical dimension and molar position in adult patients with Class I malocclusion treated with non-extraction. Methods: Pre- and post-treatment lateral cephalometric radiographs of adult patients treated with either clear aligners (n=44) or traditional fixed appliances (n=22) were selected for retrospective analysis. Eight interval measurements and one nominal measurement were evaluated: anterior overbite (OB), mandibular plane angle related to cranial base (SN_MP) and related to Frankfort (FMA), lower molar height (L6H) and upper molar height (U6H), palatal plane to mandibular plane angle (PP_MP), lower facial height (LFH), total facial height (TFH), and posterior open bite (Posterior_OB). A single evaluator traced all cephalographs, and changes in select measures of the vertical dimension were compared within and between groups. Results: OB decreased (1.15 mm) and L6H increased (0.63 mm) in the traditional fixed appliance group. Mandibular plane angles (related to cranial base and to Frankfort) increased (0.43° and 0.53°, respectively) in the clear aligner group, but just FMA showed significant difference between groups (difference of 0.53°). LFH and TFH increased (ranging from 0.52 mm to 0.80 mm) in both groups, with no differences between treatment modality. Presence of visible posterior open bite significantly increased over the course of treatment. OB, FMA and L6H exhibited an interaction between treatment stage (pre- and post-treatment) and modality (clear aligner therapy and traditional fixed appliances), but no interaction among these three variables was found. Conclusions: The evidence does not support the theory that clear aligner therapy produces better vertical dimension control than traditional fixed appliances. Traditional fixed appliance therapy slightly extruded the lower molar, and clear aligner therapy produced a slightly mandibular backward rotation.

scholarly journals Multiloop edgewise archwire treatment for a patient with a severe anterior open bite and amelogenesis imperfecta

2021 ◽  
Author(s):  
Ahmed I. Masoud ◽  
T. Peter Tsay
Keyword(s):  
Open Bite ◽  
Amelogenesis Imperfecta ◽  
Radiographic Examination ◽  
Orthodontic Appliances ◽  
Plane Angle ◽  
Anterior Open Bite ◽  
Posterior Teeth ◽  
Anterior Teeth ◽  
Mandibular Plane ◽  
Mandibular Plane Angle

ABSTRACT Amelogenesis imperfecta is a rare hereditary disorder that affects dental enamel and is often associated with an anterior open bite. Orthodontic treatment of a 16-year-old female patient with hypocalcified amelogenesis imperfecta and a 9-mm anterior open bite was presented. Radiographic examination revealed a steep mandibular plane angle, an increased lower face height, a Class II skeletal pattern, and a convex profile. Additionally, the patient had stainless steel crowns on all upper and lower posterior teeth and composite veneers on the upper anterior teeth. The patient was treated nonsurgically using a multiloop edgewise archwire (MEAW). MEAW mechanics allowed for successful correction of the anterior open bite, with significant reduction in the mandibular plane angle and improvement in the patient's profile. No fixed retainers were used, results remained stable 78 months after removal of orthodontic appliances. MEAW mechanics should be considered for patients with large anterior open bites, although this technique requires excellent patient compliance.

Comparison of Root - Crown Lengths and Occlusal Contacts in Patients with Class-III Skeletal Relationship, Anterior Open-bite and High Mandibular Plane Angle

2015 ◽  
Vol 2 (1) ◽  
pp. 7 ◽  
Author(s):  
Rucha Karavade ◽  
Ajit Kalia ◽  
Salil Nene ◽  
Sonali Khandekar ◽  
Vasu Patil
Keyword(s):  
Open Bite ◽  
Plane Angle ◽  
Class Iii ◽  
Anterior Open Bite ◽  
Mandibular Plane ◽  
Mandibular Plane Angle

scholarly journals Inconsistencies in the Differential Diagnosis of Open Bite

2008 ◽  
Vol 78 (3) ◽  
pp. 415-420 ◽  
Author(s):  
Zuleyha Mirzen Arat ◽  
Mehmet Okan Akcam ◽  
Elçin Esenlik ◽  
F. Emel Arat
Keyword(s):  
Differential Diagnosis ◽  
Growth Period ◽  
Open Bite ◽  
Plane Angle ◽  
Anterior Open Bite ◽  
Visual Judgment ◽  
Mandibular Plane ◽  
Methods Of Evaluation ◽  
Mandibular Plane Angle

Abstract Objective: To examine inconsistencies in the differential diagnosis of open bite. Materials and Methods: Using visual judgments, a total of 77 anterior open-bite cases in the postpubertal growth period were grouped as either morphogenetic, functional, or combination. The same sample was also grouped as either hyperdivergent, normodivergent, or hypodivergent using mandibular-plane angle and conventional cephalometry. Kappa analysis was used to test the agreement between the 2 methods of evaluation, and χ2 tests were used to analyze the distribution of cephalometrically grouped hyperdivergent, normodivergent, and hypodivergent cases among the visually assessed morphogenetic, functional and combination groups and vice versa. A κ score of 0.343 indicated a weak agreement between visual judgment and cephalometric methods of evaluation (P < .001). Results: Despite the expectation that cases evaluated as hyperdivergent using cephalometry would be visually evaluated as morphogenetic, more than half of the cases assessed as hyperdivergent were in fact classified as functional. Conclusions: These findings highlight the inadequacy of relying solely on cephalometric evaluation to classify open bite.

scholarly journals Dental and skeletal components of Class II open bite treatment with a modified Thurow appliance

2014 ◽  
Vol 19 (1) ◽  
pp. 19-25 ◽  
Author(s):  
Helder Baldi Jacob ◽  
Ary dos Santos-Pinto ◽  
Peter H. Buschang
Keyword(s):  
Class Ii ◽  
Open Bite ◽  
Control Group ◽  
State University ◽  
Plane Angle ◽  
Anterior Open Bite ◽  
Skeletal Changes ◽  
Mandibular Plane ◽  
School Of Dentistry ◽  
Experimental Group

INTRODUCTION: Due to the lack of studies that distinguish between dentoalveolar and basal changes caused by the Thurow appliance, this clinical study, carried out by the School of Dentistry - State University of São Paulo/Araraquara, aimed at assessing the dental and skeletal changes induced by modified Thurow appliance. METHODS: The sample included an experimental group comprising 13 subjects aged between 7 and 10 years old, with Class II malocclusion and anterior open bite, and a control group comprising 22 subjects similar in age, sex and mandibular plane angle. Maxillary/mandibular, horizontal/vertical, dental/skeletal movements (ANS, PNS, U1, U6, Co, Go, Pog, L1, L6) were assessed, based on 14 landmarks, 8 angles (S-N-ANS, SNA, PPA, S-N-Pog, SNB, MPA, PP/MPA, ANB) and 3 linear measures (N-Me, ANS-Me, S-Go). RESULTS: Treatment caused significantly greater angle decrease between the palatal and the mandibular plane of the experimental group, primarily due to an increase in the palatal plane angle. ANB, SNA and S-N-ANS angles significantly decreased more in patients from the experimental group. PNS was superiorly remodeled. Lower face height (ANS-Me) decreased in the experimental group and increased in the control group. CONCLUSIONS: The modified Thurow appliance controlled vertical and horizontal displacements of the maxilla, rotated the maxilla and improved open bite malocclusion, decreasing lower facial height.

scholarly journals Maxillary protraction and vertical control utilizing skeletal anchorage for midfacial-maxillary deficiency

2021 ◽  
Vol 26 (6) ◽  
Author(s):  
Kensuke MATSUMOTO ◽  
Nipul TANNA
Keyword(s):  
Case Report ◽  
Vertical Dimension ◽  
Skeletal Anchorage ◽  
Plane Angle ◽  
Class Iii ◽  
Skeletal Class ◽  
Maxillary Protraction ◽  
Vertical Control ◽  
Mandibular Plane ◽  
Mandibular Plane Angle

ABSTRACT Introduction: The efficacy and efficiency of early treatment of skeletal Class III patients with facemask therapy are well-documented; however, very few cases for adolescents or adults were reported. Objective: The aim of this case report was to demonstrate skeletal and dental correction of a post-pubertal-growth-spurt patient whose malocclusion consisted of a skeletal Class III with slight transverse deficiency, a high mandibular plane angle, and a retrusive maxillary complex. Case report: A 13-year-5-months old Hispanic female was diagnosed as a retrognathic maxilla and mandible, a high mandibular plane angle, open bite pattern, a bilateral Angle Class I molar relationship with an anterior crossbite on the maxillary lateral incisors. A TAD-supported Haas rapid palatal expander was utilized for maxillary protraction combined with a facemask, vertical control, and maxillary molar distalization with fixed appliance. Results: The total treatment time was 26 months. An improved facial profile with maxillary lip support and more prominent cheeks was established. Adequate vertical control prevented a change in the mandibular plane angle even though facemask treatment can increase the vertical dimension. After the 18-month retention, excellent stability of the treatment results was shown. Conclusion: With skeletal anchorage and facemask treatment, orthodontists have the ability of expanding and protracting the maxilla without tipping maxillary molars buccally and without the risk of unfavorable periodontal consequences. A TAD-supported Haas rapid palatal expander allowed to control the vertical dimension and distalize molars, while minimizing undesired consequences.

scholarly journals Vertical segmental anterior mandibular distraction to aid closure of a severe anterior open bite associated with an accentuated reverse curve of Spee

2021 ◽  
pp. 146531252110000
Author(s):  
Peter Fowler ◽  
Jennifer Haworth ◽  
Leon Steenberg
Keyword(s):  
Case Report ◽  
Open Bite ◽  
Plane Angle ◽  
Anterior Open Bite ◽  
Le Fort ◽  
Mandibular Distraction ◽  
Curve Of Spee ◽  
Mandibular Plane ◽  
Le Fort I ◽  
Lower Arch

Background: The correction of severe anterior open bite is technically challenging, often requiring the use of complex orthodontic mechanics and/or orthognathic surgery and has a relatively high risk of relapse. A marked reverse curve of Spee in the lower arch presents additional challenges when correcting a severe anterior open bite. Methods and Materials: A 22.2-year-old Caucasian man presented with concerns relating to poor anterior occlusion associated with a 1.3-cm anterior open bite. There was an accentuated reverse curve of Spee to the lower arch, an increased maxillary-mandibular plane angle and increased lower face height. Multidisciplinary treatment involving the use of segmental anterior mandibular distraction to level the curve of Spee before undertaking a Le Fort I posterior maxillary impaction is described in this case report. Results: Long-term post-treatment records showed stable anterior open bite correction. Conclusions: This case report illustrates the successful use of segmental anterior mandibular vertical distraction followed by conventional Le Fort I posterior impaction surgery to correct a severe anterior open bite associated with an accentuated reverse curve of Spee and high maxillary-mandibular plane angle.

scholarly journals Relationships between the root-crown ratio and the loss of occlusal contact and high mandibular plane angle in patients with open bite

2012 ◽  
Vol 83 (1) ◽  
pp. 36-42 ◽  
Author(s):  
Sawako Uehara ◽  
Aya Maeda ◽  
Hiroshi Tomonari ◽  
Shouichi Miyawaki
Keyword(s):  
Root Length ◽  
Open Bite ◽  
Plane Angle ◽  
Panoramic Radiographs ◽  
Occlusal Contact ◽  
Clinically Normal ◽  
Anterior Teeth ◽  
Mandibular Plane ◽  
Mean Differences ◽  
Mandibular Plane Angle

Abstract Objective: To determine the root-crown (R/C) ratio and dental root length of teeth in patients with open bite and seek any relationships with occlusal contact (OC) and the mandibular plane (Mp) angle. Materials and Methods: Thirty-one patients with open bite with negative overbite of at least four anterior teeth and 31 control patients with clinically normal overjet and overbite were enrolled. R/C ratios, dental root length, OC, and Mp angle were measured using panoramic radiographs, dental casts, and cephalograms, respectively. Mean differences between the groups, and variations between the R/C ratio or root length and Mp angle in patients with open bite were statistically analyzed. Results: R/C and OC ratios from the incisors to premolars were significantly lower for patients with open bite than for controls, and some teeth had short dental roots. Relationships between low R/C ratio or root length and high Mp angle were significant in patients with open bite. Conclusion: Patients with open bite, especially those with a high Mp angle, have an unfavorable R/C ratio and short dental roots in some teeth, which may be related to the loss of OC.

scholarly journals The maxillary incisor display at rest: analysis of the underlying components

2018 ◽  
Vol 23 (6) ◽  
pp. 48-55 ◽  
Author(s):  
Waqar Jeelani ◽  
Mubassar Fida ◽  
Attiya Shaikh
Keyword(s):  
Soft Tissue ◽  
Linear Regression ◽  
Linear Regression Analysis ◽  
Plane Angle ◽  
Upper Lip ◽  
Facial Height ◽  
Mandibular Plane ◽  
Lateral Cephalograms ◽  
The Relationship ◽  
Mandibular Plane Angle

ABSTRACT Introduction: Maxillary incisal display is one of the most important attributes of smile esthetics. Objective: The aim of this study was to determine the relationship between maxillary incisal display at rest (MIDR) and various soft tissue, hard tissue and dental components. Methods: A cross-sectional study was conducted on 150 subjects (75 males, 75 females) aged 18-30 years. The MIDR was recorded from the pretreatment orthodontic records. The following parameters were assessed on lateral cephalograms: ANB angle, mandibular plane angle, palatal plane angle, lower anterior and total anterior facial heights, upper incisor inclination, upper anterior dentoalveolar height, and upper lip length, thickness and protrusion. The relationship between MIDR and various skeletal, dental and soft tissue components was assessed using linear regression analyses. Results: The mean MIDR was significantly greater in females than males (p = 0.011). A significant positive correlation was found between MIDR and ANB angle, mandibular plane angle and lower anterior facial height. A significant negative correlation was found between MIDR and upper lip length and thickness. Linear regression analysis showed that upper lip length was the strongest predictor of MIDR, explaining 29.7% of variance in MIDR. A multiple linear regression model based on mandibular plane angle, lower anterior facial height, upper lip length and upper lip thickness explained about 63.4% of variance in MIDR. Conclusions: Incisal display at rest was generally greater in females than males. Multiple factors play a role in determining MIDR, nevertheless upper lip length was found to be the strongest predictor of variations in MIDR.

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