Long-term Anteroposterior and Vertical Maxillary Changes in Skeletal Class II Patients Treated with Slow and Rapid Maxillary Expansion

Abstract Objective: To evaluate a 10-year follow-up of anteroposterior and vertical maxillary changes in skeletal Class II patients treated with slow and rapid maxillary expansion methods. Materials and Methods: The sample consisted of 70 patients divided into two groups: (1) treated with a cervical headgear with expansion of the inner bow (CHG) and (2) using a Haas-type rapid maxillary expansion appliance in conjunction with cervical headgear (RME-CHG). The CHG group consisted of 40 patients (18 males and 22 females; average age 10.6 years at pretreatment [T1], 13.6 years at posttreatment [T2], and 23.6 years at postretention [T3]). The RME-CHG group consisted of 30 patients (14 males and 16 females; average age 10.4 years at T1, 14.0 years at T2, and 24.6 years at T3). The profiles of SNA and SN-PP angles showed no significant differences in either group at T1, T2, and T3 phases. Results: For the entire sample, the profile analysis between the phases showed reduction in the SNA angle from T1–T2 and an increase from T2–T3. The SN-PP angle showed an increase from T1–T2 and a decrease from T2–T3. Treatment of skeletal Class II patients with slow and rapid maxillary expansions was efficient and stable over the long-term. Conclusions: The profiles of SNA and SN-PP at T1, T2, and T3 achieved with slow and rapid maxillary expansions were clinically equivalent.

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Mandibular Behavior with Slow and Rapid Maxillary Expansion in Skeletal Class II Patients

The Angle Orthodontist ◽

10.2319/071406-294 ◽

2007 ◽

Vol 77 (4) ◽

pp. 625-631 ◽

Cited By ~ 10

Author(s):

Roberto M. A. Lima Filho ◽

Antonio Carlosde Oliveira Ruellas

Keyword(s):

Profile Analysis ◽

Class Ii ◽

Rapid Maxillary Expansion ◽

Maxillary Expansion ◽

Entire Sample ◽

Skeletal Class ◽

Skeletal Class Ii ◽

All Treatment

Abstract Objective: To evaluate anteroposterior and vertical mandibular changes in skeletal Class II patients treated with slow or rapid maxillary expansions at 10-year follow-up. Materials and Methods: The sample consisted of 70 patients divided into two groups, treated with (1) a cervical headgear (CHG) with expansion of the inner bow or (2) a Haas-type rapid maxillary expansion (RME) appliance in conjunction with CHG (RME-CHG). The CHG group consisted of 40 patients (18 males and 22 females, with an average age of 10.6 years at pretreatment [T1], 13.6 years at posttreatment [T2], and 23.6 years at postretention [T3]), and the RME-CHG group consisted of 30 patients (14 males and 16 females with an average age of 10.4 years at T1, 14.0 years at T2, and 24.6 years at T3). Results: The profiles of SNB, B-Hor, and Pog-Hor showed significant increases for all treatment phases in both groups. The SN-Go-Gn angle showed no significant decrease from T1 to T2 and a significant decrease from T2 to T3. Conclusions: For the entire sample (CHG + RME-CHG) the profile analysis between the phases showed mean increases in B-Ver and Pog-Ver for both phases.

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Comparison of the effects of rapid maxillary expansion versus Twin Block appliance on mandibular growth in skeletal Class II patients

BMC Oral Health ◽

10.1186/s12903-020-01344-8 ◽

2020 ◽

Vol 20 (1) ◽

Author(s):

Jia-Nan Zhang ◽

Si Chen ◽

Cheng-Yi Huang ◽

Chong Zhong ◽

Jing Jin ◽

...

Keyword(s):

Class Ii ◽

Rapid Maxillary Expansion ◽

Maxillary Expansion ◽

Fixed Appliance ◽

Mandibular Growth ◽

Twin Block ◽

Skeletal Class ◽

Skeletal Changes ◽

Skeletal Class Ii ◽

Growth Changes

Abstract Background This is a retrospective study that compares mandibular growth changes in skeletal Class II patients treated by rapid maxillary expansion (RME) and following fixed appliance with those patients treated by Twin-Block (TB) and following fixed appliance. Methods Fourteen patients treated by RME and following fixed appliance were included into the RME group. Fifteen patients treated by Twin-Block and following fixed appliance were included into the TB group. Lateral cephalometric radiographs taken before treatment and immediately after fixed appliance treatment were used to evaluate mandibular growth effects. Results The starting forms of the patients in the two groups were examined to be of good comparability. The mandibular length increased significantly in both groups as measured by Co-Gn, Go-Gn and Ar-Gn, but the TB group didn’t show more mandibular growth than the RME group (P > 0.05). Skeletal changes of the mandible in vertical dimension were different in the two groups. The change in FMA was 0.35° in the RME group, while the change was 2.65° in the TB group (P < 0.001). The change in LAFH was 5.14 mm in the RME group, significantly smaller than the change of 10.19 mm in the TB group (P < 0.001). Conclusion The investigated Phase I treatment with RME followed by Phase II treatment of fixed appliance achieved the same increases in sagittal mandibular growth and facial profile improvements as the Twin-Block therapy. The treatment with RME followed by fixed appliance was better for vertical control, while the treatment with Twin-Block followed by fixed appliance significantly increased the mandibular plane angle.

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Comparison of the Effects of Rapid Maxillary Expansion vs Twin Block Appliance on Mandibular Growth in Skeletal Class II Patients.

10.21203/rs.3.rs-73492/v1 ◽

2020 ◽

Author(s):

Jia-Nan Zhang ◽

Si Chen ◽

Cheng-Yi Huang ◽

Chong Zhong ◽

Jing Jin ◽

...

Keyword(s):

Class Ii ◽

Rapid Maxillary Expansion ◽

Maxillary Expansion ◽

Fixed Appliance ◽

Mandibular Growth ◽

Twin Block ◽

Skeletal Class ◽

Skeletal Changes ◽

Skeletal Class Ii ◽

Growth Changes

Abstract Background: This is a retrospective study that compares mandibular growth changes in skeletal Class II patients treated by rapid maxillary expansion (RME) and following fixed appliance with those patients treated by Twin-Block (TB) and following fixed appliance. Methods: Fourteen patients treated by RME and following fixed appliance were included into the RME group. Fifteen patients treated by Twin-Block and following fixed appliance were included into the TB group. Lateral cephalometric radiographs taken before treatment and immediately after fixed appliance treatment were used to evaluate mandibular growth effects. Results: The starting forms of the patients in the two groups were examined to be of good comparability. The mandibular length increased significantly in both groups as measured by Co-Gn, Go-Gn and Ar-Gn, but the TB group didn’t show more mandibular growth than the RME group (P>0.05). Skeletal changes of the mandible in vertical dimension were different in the two groups. The change in FMA was 0.35° in the RME group, while the change was 2.65° in the TB group (P<0.001). The change in LAFH was 5.14mm in the RME group, significantly smaller than the change of 10.19mm in the TB group (P<0.001).Conclusions: The investigated Phase I treatment with RME followed by Phase II treatment of fixed appliance achieved the same increases in sagittal mandibular growth and facial profile improvements as the Twin-Block therapy. The treatment with RME followed by fixed appliance was better for vertical control, while the treatment with Twin-Block followed by fixed appliance significantly increased the mandibular plane angle.

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Long-term follow-up of late maxillary orthopedic advancement with the Liou-Alternate rapid maxillary expansion-constriction technique in patients with skeletal Class III malocclusion

American Journal of Orthodontics and Dentofacial Orthopedics ◽

10.1016/j.ajodo.2020.04.027 ◽

2021 ◽

Author(s):

Maria Costanza Meazzini ◽

Camilla Torre ◽

Alessandro Cappello ◽

Roberto Tintinelli ◽

Elena De Ponti ◽

...

Keyword(s):

Rapid Maxillary Expansion ◽

Class Iii ◽

Class Iii Malocclusion ◽

Maxillary Expansion ◽

Skeletal Class ◽

Long Term Follow Up

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Twenty-year follow-up of functional treatment with a bionator appliance: A retrospective dental cast analysis

The Angle Orthodontist ◽

10.2319/042419-292.1 ◽

2019 ◽

Vol 90 (2) ◽

pp. 209-215 ◽

Cited By ~ 2

Author(s):

Rebecca Jungbauer ◽

Vasiliki Koretsi ◽

Peter Proff ◽

Ingrid Rudzki ◽

Christian Kirschneck

Keyword(s):

Class Ii ◽

Mandibular Incisor ◽

Lower Incisor ◽

Par Index ◽

Skeletal Class Ii ◽

Cast Analysis ◽

Dental Cast ◽

Intercanine Distance

ABSTRACT Objective: To investigate changes in dental arch configuration, relationship, and malocclusion directly after Class II malocclusion treatment with a Balters bionator modified by Ascher as well as 20 years after treatment. Materials and Methods: Orthodontic dental cast analysis of 18 patients with skeletal Class II treated with a bionator without any additional fixed therapy was performed with a digital caliper at three stages: before (T0), after (T1) and 20 years after (T2) treatment. Arch perimeter and depth, intermolar and intercanine distance, overjet, overbite, sagittal molar and canine relationship, mandibular incisor irregularity (Little's index), and malocclusion (PAR index) were assessed. Results: During treatment (T0–T1), upper arch perimeter significantly increased with a significant decrease in the upper and lower arch perimeter long-term (T1–T2), whereas corresponding arch depths changed only slightly in both periods. Transverse intermolar width increased significantly during treatment, remaining almost constant from T1 to T2. Lower intercanine distance remained fairly unchanged during treatment, but decreased significantly during follow-up. Lower incisor irregularity improved slightly during treatment but increased significantly long-term. After treatment, sagittal molar relationships on both sides were improved, overjet and overbite reduced; these significant changes remained stable long-term. The peer assessment rating (PAR) index was significantly lower after treatment and increased insignificantly during follow-up. Conclusions: 20 years after bionator treatment without additional fixed appliances, the improved sagittal relationship and the reduced overjet and PAR index remained fairly stable. Long-term changes are most likely due to physiological aging processes and are not associated with bionator treatment.

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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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