Influence of Class II Elastics on Centric Relation and Centric Occlusion Discrepancy after Orthodontic Treatment

Complete correction of Class II malocclusion in an adult patient is not an easy task. In a case with large skeletal discrepancy, orthognathic surgery is the treatment of choice. However, in case of slight or borderline discrepancy, other treatment options are available, such as tooth extractions and miniscrews. Intermediate cases can also be treated with Class II correctors and elastics. This clinical report presents the orthodontic treatment of a 25-year-old female patient with Class II malocclusion. Clinically, the maxilla was well positioned, and the mandible was slightly retruded. The patient presented vestibularized upper incisors, well-positioned lower incisors and opted for a more aesthetically attractive orthodontic appliance. The treatment plan included teeth leveling and aligning in both arches, Class II correction, establishment of Class I molar and canine relationships, correction of overjet and overbite, midline correction, and improvement of facial and dental aesthetics. The orthodontic treatment consisted of removable Invisalign aligners and Class II elastics.

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Three-dimensional mandibular changes associated with Class II elastics and extractions treatment in adult patients

10.21203/rs.3.rs-400695/v1 ◽

2021 ◽

Author(s):

Hong Liu ◽

Xun Xi ◽

Dongxu Liu

Keyword(s):

Orthodontic Treatment ◽

Morphological Changes ◽

Three Dimensional ◽

Class Ii ◽

Initial Position ◽

Virtual Reference ◽

Morphological Alterations ◽

3 Dimensional ◽

Slight Rotation ◽

Class Ii Elastics

Abstract Backgroud: The apllication of Class II elastic can induce the rotation of mandible and condylar response. The purpose of this study was to assess the positional and morphological alterations of mandible after orthodontic treatment with Class II elastic by using of 3-dimensional superimposition of pretreatment (T1), posttreatment (T2) and after retention (T3) CBCT data. Methods: With sequential 3D superimpositions that combined cranial base superimpositions with regional mandibular superimpositions, the virtual reference mandibles were placed to distinguish morphological changes from positional changes. The morphological changes and positional changes of mandibles were measured by comparing multiple combinations of reference and original mandibles respectively, and the corresponding paired t test was performed using SPSS (IBM SPSS version 23). Results: During orthodontic treatment (T1-T2), the mandibular molars were extruded, and the condyles were revealed apparent adaptive remodeling and upward/backward displacements. The mandible rotated backwardly and drifted backwardly/downwardly. The condylar growth and displacements were significantly different. The condylar growth did not induce isometric displacements and the forward rotation was restricted. Two years after retention (T2-T3), continuous morphological and positional changes occurred. The condylar remodeling and forward/downward displacements induced forward mandibular rotation and neutralized the backward rotation during treatment period (T1-T2). The overall positional changes (T1-T3) were translations with slight rotation. Statistically significant differences were found between the treatment and overall variables regarding the 3D rotation, condylar displacement, Pog displacement. And with the continuous morphological and positional changes, the condyle moved back to the initial position after the retention stage.Conclusion: Conclusions: the sequential 3D superimposition method can produce the reference mandibles and distinguish the morphological changes from positional alterations. The class II elastics induced mandibular complex changes including condylar adaptive remodeling and 3D rotation and translation. The condyles morphologically adapted to resist the rotation effects of Class II elastic.

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Effects of CO-CR Discrepancy in Daily Orthodontic Treatment Planning

Medicine and Pharmacy Reports ◽

10.15386/cjmed-538 ◽

2016 ◽

Vol 89 (2) ◽

pp. 279-286 ◽

Cited By ~ 2

Author(s):

Carmen Maria Costea ◽

Mîndra Eugenia Badea ◽

Sorin Vasilache ◽

Michaela Mesaroș

Keyword(s):

Orthodontic Treatment ◽

The Other ◽

Dental Occlusion ◽

Study Group ◽

Articular Disc ◽

Stable Position ◽

Centric Relation ◽

Asymptomatic Patients ◽

Dental Office ◽

Centric Occlusion

Background and aims. Nowadays centric relation is defined as a musculoskeletal stable position, with the condyles forward, as far upward as possible, centered transversely and with the articular disc properly interposed. On the other hand, centric occlusion or maximum intercuspidation is a dental determined position. The purpose of this pilot study is to evaluate the direction, frequency and magnitude of the discrepancy between centric occlusion and centric relation in all three axial directions, in a muscular non-deprogrammed population, before the beginning of orthodontic treatment.Methods. The study group was represented by 40 symptomatic and asymptomatic patients seeking orthodontic treatment in a private dental office in Cluj-Napoca, Romania between 2014 and 2015. All patients had full records and articulator mounted models. All measurements were analyzed three-dimensionally.Results. 85% of the patients had vertical and 87.5% had horizontal CO-CR discrepancy for both condyles. 87.5% of the cases have had a significant condylar displacement in at least one of the three planes.Conclusions. We should be aware of the dental occlusion determined by the dental contacts and the occlusion dictated by the musculoskeletal stable position of the condyles. The bigger the discrepancy between these two positions at the level of the condyles, the greater the chances to have either a patient who will develop a form of TMD before/during or after the orthodontic or prosthetic treatment, or a patient suffering already, but poorly diagnosed.

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Perbedaan Analisis Sefalometri Skeletal Sebelum dan Sesudah Perawatan Alat Myofunctional pada Pasien Maloklusi Dentoskeletal Kelas II Divisi I dalam Masa Pertumbuhan dengan Metode Steiner

Majalah Sainstekes ◽

10.33476/ms.v4i2.906 ◽

2019 ◽

Vol 4 (2) ◽

Author(s):

Nugroho Ahmad Riyadi

Keyword(s):

Orthodontic Treatment ◽

Class Ii ◽

T Test ◽

Analytic Study ◽

Statistic Analysis ◽

Twin Block ◽

Normal Occlusion ◽

Division 1 ◽

Before And After ◽

Class Ii Division 1

The aim of orthodontics treatment is normalization of teeth position in three planes, using various orthodontics appliance to reach the chepalometric standar and normal occlusion. Orthodontic treatment for dentoskeletal class II division 1 malocclusion in growing patients using myofunctional appliance may correct anteroposterior planes of mandibula. This study was a descriptive retrospective analytic study to look at the success of Orthodontic treatment for dentoskeletal class II division 1 in growing patients with myofunctional appliance using chepalometrics analysis Steiner value. The sample used in this study is chepalogram radiographic from patient with dentoskeletal class II division 1 malocclusion in growing patients before and after using myofunctional appliance in PPDGS orthodontics Clinic of Padjadjaran University. Statistic analysis were performed with pair t-test and Wilcoxon. Based on this study, it is concluded that orthodontic treatment with myofunctional appliance such as activator and twin block in growing patient with dentoskeletal class II division 1 malocclusion shows significant changes and compatibility with the normal criteria.

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Recovery of anterior torque loss and correction of deep bite occurred during orthodontic treatment with premolar extraction in Class II patients

AJO-DO Clinical Companion ◽

10.1016/j.xaor.2021.01.007 ◽

2021 ◽

Author(s):

Ki-Ho Park ◽

Young-Guk Park ◽

Jae Hyun Park

Keyword(s):

Orthodontic Treatment ◽

Class Ii ◽

Deep Bite ◽

Premolar Extraction ◽

Torque Loss

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Steering the Mandible in the Right Direction : Forsus Case Series

The Journal of Indian Orthodontic Society ◽

10.1177/03015742211005404 ◽

2021 ◽

pp. 030157422110054

Author(s):

Prachi Gohil ◽

Sonali Mahadevi ◽

Bhavya Trivedi ◽

Neha Assudani ◽

Arth Patel ◽

...

Keyword(s):

Orthodontic Treatment ◽

Case Series ◽

Treatment Compliance ◽

Class Ii ◽

Skeletal Class ◽

Skeletal Class Ii ◽

Technological Advances ◽

Functional Appliances ◽

The Right ◽

Mandibular Retrognathia

We are in the process of discovery of new vistas for technological advances in terms of various appliances with a vision of making orthodontic treatment compliance free as well as successful. Due to improved technology, the enigma of treating the Class II syndrome is palliated. “Out of the box” thinking has become a norm to treat certain situations that were not corrected in noncompliant patients. Fixed functional appliances are valuable tools introduced to assist the correction of skeletal Class II malocclusion with mandibular retrognathia at the deceleration stage of growth for achieving stable results. In this direction a case series is reported of patients having the above conditions and undergoing orthodontic treatment using a Forsus FFA. Joining hands with technology is a win-win situation for both the patient and the orthodontist.

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Dental and skeletal changes in mild to moderate Class II malocclusions treated by either a Twin-block or Xbow appliance followed by full fixed orthodontic treatment

The Angle Orthodontist ◽

10.2319/092814-696.1 ◽

2015 ◽

Vol 85 (6) ◽

pp. 997-1002 ◽

Cited By ~ 5

Author(s):

Sayeh Ehsani ◽

Brian Nebbe ◽

David Normando ◽

Manuel O Lagravere ◽

Carlos Flores-Mir

Keyword(s):

Orthodontic Treatment ◽

Class Ii ◽

Control Group ◽

Block Group ◽

Two Phase ◽

Mandibular Incisor ◽

Twin Block ◽

Treatment Groups ◽

Skeletal Changes ◽

Length Increase

ABSTRACT Objective: To compare the short-term skeletal and dental effects of two-phase orthodontic treatment including either a Twin-block or an XBow appliance. Materials and Methods: This was a retrospective clinical trial of 50 consecutive Class II cases treated in a private practice with either a Twin-block (25) or XBow (25) appliance followed by full fixed orthodontic treatment. To factor out growth, an untreated Class II control group (25) was considered. Results: A MANOVA of treatment/observation changes followed by univariate pairwise comparisons showed that the maxilla moved forward less in the treatment groups than in the control group. As for mandibular changes, the corpus length increase was larger in the Twin-block group by 3.9 mm. Dentally, mesial movement of mandibular molars was greater in both treatment groups. Although no distalization of maxillary molars was found in either treatment group, restriction of mesial movement of these teeth was seen in both treatment groups. Both treatment groups demonstrated increased mandibular incisor proclination with larger increases for the XBow group by 3.3°. The Wits value was decreased by 1.6 mm more in the Twin-block group. No sex-related differences were observed. Conclusions: Class II correction using an XBow or Twin-block followed by fixed appliances occurs through a relatively similar combination of dental and skeletal effects. An increase in mandibular incisor inclination for the XBow group and an increased corpus length for the Twin-block group were notable exceptions. No overall treatment length differences were seen.

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Influence of unilateral maxillary first molar extraction treatment on second and third molar inclination in Class II subdivision patients

The Angle Orthodontist ◽

10.2319/100414-710.1 ◽

2015 ◽

Vol 86 (1) ◽

pp. 94-100 ◽

Cited By ~ 3

Author(s):

Christos Livas ◽

Nikolaos Pandis ◽

Johan Willem Booij ◽

Demetrios J. Halazonetis ◽

Christos Katsaros ◽

...

Keyword(s):

Private Practice ◽

Orthodontic Treatment ◽

Statistical Significance ◽

Third Molar ◽

Class Ii ◽

Second Molar ◽

Inclination Angles ◽

And Gender ◽

Extraction Treatment ◽

Over Time

ABSTRACT Objective: To assess the maxillary second molar (M2) and third molar (M3) inclination following orthodontic treatment of Class II subdivision malocclusion with unilateral maxillary first molar (M1) extraction. Materials and Methods: Panoramic radiographs of 21 Class II subdivision adolescents (eight boys, 13 girls; mean age, 12.8 years; standard deviation, 1.7 years) before treatment, after treatment with extraction of one maxillary first molar and Begg appliances and after at least 1.8 years in retention were retrospectively collected from a private practice. M2 and M3 inclination angles (M2/ITP, M2/IOP, M3/ITP, M3/IOP), constructed by intertuberosity (ITP) and interorbital planes (IOP), were calculated for the extracted and nonextracted segments. Random effects regression analysis was performed to evaluate the effect on the molar angulation of extraction, time, and gender after adjusting for baseline measurements. Results: Time and extraction status were significant predictors for M2 angulation. M2/ITP and M2/IOP decreased by 4.04 (95% confidence interval [CI]: −6.93, 1.16; P = .001) and 3.67 (95% CI: −6.76, −0.58; P = .020) in the extraction group compared to the nonextraction group after adjusting for time and gender. The adjusted analysis showed that extraction was the only predictor for M3 angulation that reached statistical significance. M3 mesial inclination increased by 7.38° (95% CI: −11.2, −3.54; P < .001) and 7.33° (95% CI: −11.48, −3.19; P = .001). Conclusions: M2 and M3 uprighting significantly improved in the extraction side after orthodontic treatment with unilateral maxillary M1 extraction. There was a significant increase in mesial tipping of maxillary second molar crowns over time.

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