scholarly journals Changes in mandibular shape after early treatment in subjects with open bite: a geometric morphometric analysis

2020 ◽  
Vol 42 (6) ◽  
pp. 643-649
Author(s):  
Roberta Lione ◽  
Dimitri Fusaroli ◽  
Manuela Mucedero ◽  
Valeria Paoloni ◽  
Chiara Pavoni ◽  
...  
Keyword(s):  
Open Bite ◽  
Procrustes Analysis ◽  
Control Group ◽  
Maxillary Expansion ◽  
Mandibular Ramus ◽  
Anterior Open Bite ◽  
Bite Block ◽  
Geometric Morphometric ◽  
Counterclockwise Rotation ◽  
Lateral Cephalograms

Summary Objectives To evaluate the mandibular modifications in anterior open bite (OB) growing subjects treated with Rapid Maxillary Expansion and bite block (RME/BB) or Quad Helix with crib (QH/C) when compared with a Control Group (CG) by using Geometric Morphometric Method (GMM) and conventional cephalometric. Materials The OB group comprised 34 subjects (26 girls, 8 boys) with dentoskeletal OB and a mean age of 8.0 ± 1.0 years. OB group was divided in two subgroups: RME/BB group comprised 17 subjects (13 girls, 4 boys), while QH/C group included 17 subjects (13 girls, 4 boys). The two subgroups were compared with a CG of 17 subjects (13 girls, 4 boys) matched for sex, age, vertical pattern, and observation periods. Two consecutives lateral cephalograms were available: the first one was taken before treatment (T1), and the second one was acquired at a follow-up observation at least 4 years after the completion of treatment (T2). Landmarks and semilandmarks were digitized on lateral cephalograms and GMM was applied. Procrustes analysis and principal component analysis were performed. Analysis of variance (ANOVA) with Tukey post hoc tests was used to compare the T2–T1 cephalometric changes between the RME/BB, QH/C, and CG. Results In the long term, RME/BB showed a significantly greater decrease of the Condylar axis to mandibular plane angle when compared to CG and QH/C. GMM showed an increased in height of the mandibular ramus in RME/BB group with tendency to counterclockwise rotation of the mandible when compared with QH/C and CG groups. Conclusions RME/BB subjects showed significant changes in the shape of the mandibular ramus with a counterclockwise rotation tendency when compared with QH/C and CG subjects.

scholarly journals Palatal Vault Morphometric Analysis of the Effects of Two Early Orthodontic Treatments in Anterior Open Bite Growing Subjects: A Controlled Clinical Study

2021 ◽  
Author(s):  
Valeria Paoloni ◽  
Dimitri Fusaroli ◽  
Ludovica Marino ◽  
Manuela Mucedero ◽  
Paola Cozza
Keyword(s):  
Morphometric Analysis ◽  
Morphological Changes ◽  
Principal Component ◽  
Open Bite ◽  
Procrustes Analysis ◽  
Control Group ◽  
Maxillary Expansion ◽  
Anterior Open Bite ◽  
Bite Block ◽  
Dental Casts

Abstract Background: The purpose of this study was to evaluate the palatal morphological changes in Anterior Open Bite (AOB) pre-pubertal subjects treated with Rapid Maxillary Expansion and Bite-Block (RME/BB) or Quad Helix with crib (QH/C) when compared with a Control Group (CG) by using Geometric Morphometric Analysis (GMM). Methods: AOB group (AOBG) included 30 subjects (20 females, 10 males, mean age 8.1 ± 0.8ys) with dentoskeletal AOB. AOBG was divided in two subgroups according to the treatment strategy: RME/BB group (RME/BBg) included 15 subjects (10 females, 5 males, QH/C group (QH/Cg) comprised 15 subjects (10 females, 5 males). The two subgroups were compared with a CG of 15 subjects (10 females, 5 males) matched for sex, age, vertical pattern, and observation period. Digital upper dental casts were collected before treatment (T1) and at the end of the active treatment (T2). Landmarks and semilandmarks were digitized on dental casts and GMM was applied. Procrustes analysis and principal component analysis (PCA) were performed.Results: At T2, RME/BBg when compared with QH/Cg evidenced no statistically significant differences. Instead, RME/BBg showed an increased maxillary transverse dimension and a decreased palatal depth when compared with CG. The comparison QH/Cg vs CG demonstrated a slight transversal maxillary expansion.Conclusions: RME/BBg showed significant changes in the transversal and vertical dimensions with a clear maxillary expansion and a decrease of the palatal depth when compared with QH/Cg and CG. QH/Cg showed a significant slight maxillary expansion and no variation in vertical and sagittal planes when compared with CG.

scholarly journals Palatal vault morphometric analysis of the effects of two early orthodontic treatments in anterior open bite growing subjects: a controlled clinical study

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Valeria Paoloni ◽  
Dimitri Fusaroli ◽  
Ludovica Marino ◽  
Manuela Mucedero ◽  
Paola Cozza
Keyword(s):  
Morphometric Analysis ◽  
Morphological Changes ◽  
Principal Component ◽  
Open Bite ◽  
Procrustes Analysis ◽  
Control Group ◽  
Maxillary Expansion ◽  
Anterior Open Bite ◽  
Bite Block ◽  
Dental Casts

Abstract Background The purpose of this study was to evaluate the palatal morphological changes in Anterior Open Bite (AOB) pre-pubertal subjects treated with Rapid Maxillary Expansion and Bite-Block (RME/BB) or Quad Helix with crib (QH/C) when compared with a Control Group (CG) by using Geometric Morphometric Analysis (GMM). Methods AOB group (AOBG) included 30 subjects (20 females, 10 males, mean age 8.1 ± 0.8ys) with dentoskeletal AOB. AOBG was divided in two subgroups according to the treatment strategy: RME/BB group (RME/BBg) included 15 subjects (10 females, 5 males, QH/C group (QH/Cg) comprised 15 subjects (10 females, 5 males). The two subgroups were compared with a CG of 15 subjects (10 females, 5 males) matched for sex, age, vertical pattern, and observation period. Digital upper dental casts were collected before treatment (T1) and at the end of the active treatment (T2). Landmarks and semilandmarks were digitized on dental casts and GMM was applied. Procrustes analysis and principal component analysis (PCA) were performed. Results At T2, RME/BBg when compared with QH/Cg evidenced no statistically significant differences. Instead, RME/BBg showed an increased maxillary transverse dimension and a decreased palatal depth when compared with CG. The comparison QH/Cg vs. CG demonstrated a slight transversal maxillary expansion. Conclusions RME/BBg showed significant changes in the transversal and vertical dimensions with a clear maxillary expansion and a decrease of the palatal depth when compared with QH/Cg and CG. QH/Cg showed a significant slight maxillary expansion and no variation in vertical and sagittal planes when compared with CG.

scholarly journals Long-term evaluation of rapid maxillary expansion and bite-block therapy in open bite growing subjects:

2018 ◽  
Vol 88 (5) ◽  
pp. 523-529 ◽  
Author(s):  
Manuela Mucedero ◽  
Dimitri Fusaroli ◽  
Lorenzo Franchi ◽  
Chiara Pavoni ◽  
Paola Cozza ◽  
...  
Keyword(s):  
Rapid Maxillary Expansion ◽  
Open Bite ◽  
Control Group ◽  
Long Term Effects ◽  
Maxillary Expansion ◽  
Bite Block ◽  
Mandibular Molars ◽  
Lateral Cephalograms ◽  
Skeletal Pattern

ABSTRACT Objective: To evaluate the long-term effects of rapid maxillary expansion (RME) and posterior bite block (BB) in prepubertal subjects with dentoskeletal open bite. Materials and Methods: The treatment group (TG) comprised 16 subjects (14 girls, 2 boys) with dentoskeletal open bite with a mean age of 8.1 ± 1.1 years treated with RME and BB. Three consecutive lateral cephalograms were available before treatment (T1), at the end of the active treatment with the RME and BB (T2), and at a follow-up observation at least 4 years after the completion of treatment (T3). The TG was compared with a control group (CG) of 16 subjects (14 girls, 2 boys) matched for sex, age, and vertical skeletal pattern. An independent sample t-test was used to compare the T1 to T3, T1 to T2, and T2 to T3 cephalometric changes between the TG and the CG. Results: In the long term, the TG showed a significantly greater increase in overbite (+1.8 mm), reduced extrusion of maxillary and mandibular molars (−3.3 mm), and, consequently, a significant decrease in facial divergence (−2.8°) when compared with untreated subjects. Conclusions: The RME and BB protocol led to successful and stable recovery of positive overbite in 100% of the patients considered. Correction of open bite was associated with reduced extrusion of maxillary and mandibular molars with a significant improvement in vertical skeletal relationships when compared with the CG.

scholarly journals Treatment and Posttreatment Effects of Quad-Helix/Crib Therapy of Dentoskeletal Open Bite

2007 ◽  
Vol 77 (4) ◽  
pp. 640-645 ◽  
Author(s):  
Paola Cozza ◽  
Manuela Mucedero ◽  
Tiziano Baccetti ◽  
Lorenzo Franchi
Keyword(s):  
Nonparametric Test ◽  
Treated Group ◽  
Open Bite ◽  
Control Group ◽  
Anterior Open Bite ◽  
Mandibular Plane ◽  
Lateral Cephalograms ◽  
Thumb Sucking ◽  
Clinically Significant ◽  
Quad Helix

Abstract Objective: To investigate the effects of the quad-helix/crib (Q-H/C) appliance in subjects with thumb-sucking habits and dentoskeletal open bite at 2 years after the end of active treatment. Materials and Methods: The records of 21 subjects treated with the Q-H/C appliance were compared with a control group of 21 untreated subjects with similar vertical relationships. Lateral cephalograms were obtained before treatment (T1; mean age 8.4 ± 1.4 years) and at about 2 years after treatment (T2; mean age 11.7 ± 1.9 years) and analyzed. Mean treatment duration was 1.5 years ± 7 months. The T2–T1 changes in the two groups were compared with a nonparametric test for independent samples. Results: The mean increase in overbite during Q-H/C therapy (4.1 mm) represented an overcorrection of the amount of anterior open bite at T2. Both the maxillary and mandibular incisors showed significantly greater extrusion in the Q-H/C group than in the control group. The treated group showed a greater downward rotation (1.8°) of the palatal plane than did the control group. This change was associated with a clinically significant reduction in the palatal plane/mandibular plane angle (−2.5°) in the Q-H/C group. The upper lip showed significant retraction relative to the E-plane in the treated group (3.6 mm) compared with the controls. Conclusions: The Q-H/C appliance was effective in correcting dental open bite in 85% of the growing subjects with thumb-sucking habits and dentoskeletal open bites. Correction of anterior open bite was associated with a clinically significant improvement in maxillomandibular vertical skeletal relationships.

scholarly journals Dentoskeletal effects produced by removable palatal crib, bonded spurs, and chincup therapy in growing children with anterior open bite

2016 ◽  
Vol 86 (6) ◽  
pp. 969-975 ◽  
Author(s):  
Natalia Martins Insabralde ◽  
Renato Rodrigues de Almeida ◽  
José Fernando Castanha Henriques ◽  
Thais Maria Freire Fernandes ◽  
Carlos Flores-Mir ◽  
...  
Keyword(s):  
Analysis Of Variance ◽  
Open Bite ◽  
Treatment Modalities ◽  
Control Group ◽  
Anterior Open Bite ◽  
Lateral Cephalograms ◽  
Treatment Changes ◽  
Cephalometric Study ◽  
Post Hoc ◽  
Vertical Development

ABSTRACT Objective: To evaluate the dentoskeletal effects of different anterior open bite treatment modalities in children. Materials and Methods: This cephalometric study assessed changes resulting from different treatment approaches on 77 growing children with anterior open bite. A control group (n = 30) was used for comparison. Lateral cephalograms were available before treatment and after 12 months. The sample was divided into four groups: removable palatal crib associated with a chincup (G1), bonded spurs associated with a chincup (G2), chincup (G3), and nontreated control (G4). Statistical comparisons among the four groups were performed on T1 and the treatment changes using analysis of variance with Tukey's post hoc tests. Results: No statistically significant changes in skeletal variables were found among the groups, except for lower anterior face height (LAFH) increase in G1. Overall, effects in all of the treated groups were exclusively dentoalveolar. A larger overbite (OB) increase was observed in G1 and G2 when compared with G3 and G4. The maxillary incisors in G1 showed increased palatal tipping, retrusion, and more vertical dentoalveolar development as well as increased lingual tipping among mandibular incisors. There was less vertical development of maxillary and mandibular molars in G3. Conclusions: A removable palatal crib provided an improvement in OB (97.5%), followed by the bonded spurs (84.5%). Conversely, the chincup-only group did not have positive OB effects.

scholarly journals Prediction of mandibular movement and its center of rotation for nonsurgical correction of anterior open bite via maxillary molar intrusion

2018 ◽  
Vol 88 (5) ◽  
pp. 538-544 ◽  
Author(s):  
Kyunam Kim ◽  
Kwangchul Choy ◽  
Young-Chel Park ◽  
Seo Yeon Han ◽  
Heekyu Jung ◽  
...  
Keyword(s):  
Linear Regression Analysis ◽  
Open Bite ◽  
Reference Plane ◽  
Mandibular Movement ◽  
Anterior Open Bite ◽  
Counterclockwise Rotation ◽  
Molar Intrusion ◽  
Lateral Cephalograms ◽  
Maxillary Molar ◽  
The Relationship

ABSTRACT Objectives: To evaluate quantitatively the relationship between molar intrusion (change [Δ] maxillary first molar [U6]–palatal plane [PP]) and changes in vertical and sagittal cephalometric parameters and to determine the center of mandibular autorotation. Materials and Methods: Twenty-one patients diagnosed with anterior open bite and successfully treated with molar intrusion (overbite [OB] > 0 mm) were retrospectively enrolled. Lateral cephalograms taken before and after molar intrusion were used to measure changes in vertical and sagittal cephalometric parameters. The center of mandibular autorotation was calculated by measuring displacement of gonion (Go) and pogonion (Pog). Paired t-tests were used to compare variables, and linear regression analysis was used to examine the relationship between ΔU6-PP and other variables. Results: The mandible exhibited counterclockwise rotation after maxillary molar intrusion, which led to closure of anterior open bite. Strong linear relationships, in descending order, between ΔU6-PP and ΔOB, Δanterior facial height (AFH), Δvertical reference plane (Pog), and Δsella-nasion to Go-menton (SN-GoMe), were observed. When the maxillary molar was intruded 1 mm, OB increased by 2.6 mm, AFH decreased by 1.7 mm, Pog moved forward by 2.3 mm, and SN-GoMe decreased by 2°. The center of mandibular autorotation was located 7.4 mm behind and 16.9 mm below condylion after molar intrusion. Conclusions: The mandible exhibited counterclockwise rotation after maxillary molar intrusion; the center of mandibular autorotation was located behind and below condylion with individual variations.

scholarly journals Evaluation of the stability of open bite treatment using a removable appliance with palatal crib combined with high-pull chincup

2012 ◽  
Vol 17 (6) ◽  
pp. 52-60 ◽  
Author(s):  
Fernando Pedrin Carvalho Ferreira ◽  
Renato Rodrigues de Almeida ◽  
Fernando César Torres ◽  
Renata Rodrigues de Almeida-Pedrin ◽  
Marcio Rodrigues de Almeida ◽  
...  
Keyword(s):  
Statistical Tests ◽  
Open Bite ◽  
Control Group ◽  
Anterior Open Bite ◽  
Skeletal Changes ◽  
Lateral Cephalograms ◽  
The Stability ◽  
Removable Appliance ◽  
Experimental Group

OBJECTIVE: The aim of this prospective study was to cephalometrically analyze the stability of dentoalveolar and skeletal changes produced by a removable appliance with palatal crib associated to high-pull chincup in individuals with anterior open bite treated for 12 months, and compare them to individuals with similar malocclusion and age, not submitted to orthodontic treatment, also followed for the same period. METHODS: Nineteen children with a mean age of 9.78 years old treated for 12 months with a removable appliance with palatal crib associated with chincup therapy were evaluated after 15 months (post-treatment period) and compared with a control group of 19 subjects with mean age of 9.10 years with the same malocclusion that was followed-up for the same period. Seventy-six lateral cephalograms were evaluated at T1 (after correction) and T2 (follow-up) and cephalometric variables were analyzed by statistical tests. RESULTS: The results did not show significant skeletal, soft tissue or maxillary dentoalveolar changes. Overall, treatment effects on the experimental group were maintained at T2 evaluation with an increase of 0.56 mm in overbite. Overjet and maxillary incisors/molars position (vertical and sagittal) remained essentially unchanged during the study period. Only mandibular incisors showed significant changes (labial inclination and protrusion) compared to control group. CONCLUSIONS: Thus, it can be concluded that the early open bite treatment with a removable appliance and palatal crib associated with high-pull chincup therapy provided stability of 95%.

scholarly journals Anterior open bite: cephalometric evaluation of the dental pattern

2006 ◽  
Vol 17 (1) ◽  
pp. 68-70 ◽  
Author(s):  
Adriana Sasso Stuani ◽  
Andréa Sasso Stuani ◽  
Maria Bernadete Sasso Stuani ◽  
Maria da Conceição Pereira Saraiva ◽  
Mírian Aiko Nakane Matsumoto
Keyword(s):  
Open Bite ◽  
Occlusal Plane ◽  
Anterior Open Bite ◽  
Panoramic Radiographs ◽  
Lateral Cephalograms ◽  
Significant Difference ◽  
Dental Origin ◽  
Dental Pattern ◽  
Mandibular Incisors

The purpose of this study was to compare the dental pattern of patients with anterior open bite malocclusion to that of individuals with normal overbite by utilization of lateral cephalograms, panoramic radiographs and study casts. The findings showed that there was no significant difference in the inclination of the occlusal plane (SN.PlO) and position of the maxillary and mandibular incisors (1-NA, 1-NB) between both groups of individuals; but the angles of inclination of the maxillary and mandibular incisors (1.1, 1.NA and 1.NB) differed statistically between patients with anterior open bite of the individuals that presented normal overbite, which suggests that the anterior open bite may be of dental origin.

scholarly journals Influence of intentional ankylosis of deciduous canines to reinforce the anchorage for maxillary protraction

2013 ◽  
Vol 18 (1) ◽  
pp. 94-102 ◽  
Author(s):  
Luís Fernando Castaldi Tocci ◽  
Omar Gabriel da Silva Filho ◽  
Acácio Fuziy ◽  
José Roberto Pereira Lauris
Keyword(s):  
Mixed Dentition ◽  
Control Group ◽  
Class Iii ◽  
Maxillary Expansion ◽  
Significant Treatment ◽  
Maxillary Protraction ◽  
Lateral Cephalograms ◽  
Treatment Changes ◽  
And Gender ◽  
Cephalometric Study

INTRODUCTION: This retrospective cephalometric study analyzed the influence of intentional ankylosis of deciduous canines in patients with Class III malocclusion and anterior crossbite, in the deciduous and early mixed dentition stages, treated by orthopedic maxillary expansion followed by maxillary protraction. METHODS: Lateral cephalograms of 40 patients were used, divided in 2 groups paired for age and gender. The Ankylosis Group was composed of 20 patients (10 boys and 10 girls) treated with induced ankylosis and presenting initial and final mean ages of 7 years 4 months and 8 years 3 months, respectively, with a mean period of maxillary protraction of 11 months. The Control Group comprised 20 patients (10 boys and 10 girls) treated without induced ankylosis, with initial and final mean ages of 7 years 8 months and 8 years 7 months, respectively, with a mean period of maxillary protraction of 11 months. Two-way analysis of variance and covariance analysis were applied to compare the initial and final cephalometric variables and the treatment changes between groups. RESULTS: According to the results, the variables evidencing the significant treatment changes between groups confirmed that the intentional ankylosis enhanced the sagittal response of the apical bases (Pg-NPerp) and increased the facial convexity angles (NAP and ANB). CONCLUSIONS: The protocol involving intentional ankylosis of deciduous canines enhanced the sagittal response of the apical bases.

scholarly journals Molar Changes with Cervical Headgear Alone or in Combination with Rapid Maxillary Expansion

2008 ◽  
Vol 78 (5) ◽  
pp. 847-851 ◽  
Author(s):  
Marcel Marchiori Farret ◽  
Eduardo Martinelli S. de Lima ◽  
Vanessa Pereira Araújo ◽  
Susana Maria Deon Rizzatto ◽  
Luciane Macedo de Menezes ◽  
...  
Keyword(s):  
Class Ii ◽  
Rapid Maxillary Expansion ◽  
Control Group ◽  
Maxillary Expansion ◽  
Lateral Cephalograms ◽  
Cervical Traction ◽  
Permanent Molars ◽  
Group 2 ◽  
First Permanent Molars ◽  
Group 1

Abstract Objective: To test the hypothesis that there is no difference in the distal movement of the maxillary first permanent molars when cervical headgear is used alone or in combination with rapid maxillary expansion. Materials and Methods: The sample was composed of 36 subjects (aged 9 to 13 years), treated in the Faculty of Dentistry, Pontifícia Universidade Cat;aaolica, Rio Grande do Sul, Brazil. The individuals were in good health and in their pubertal growth period. All had Class II division 1 malocclusion. The patients were divided into two groups: group 1 (22 subjects), Class II, with a normal transverse maxilla treated with cervical traction headgear (HG) 400 g 12 h/d, and group 2 (14 subjects), Class II maxillary transverse deficiency treated with rapid maxillary expansion plus cervical traction headgear (RME + HG). An additional group 3 (17 subjects) served as a control group and included individuals with the same characteristics. All subjects had two lateral cephalograms: initial (T1) and progress (T2), taken 6 months later. Differences between T1 and T2 were compared with the Student's t-test, and three groups were compared by the analysis of variance and Tukey multiple comparison test. Results: Results showed greater distal tipping and greater distal movement of the first permanent molars in group 1 (HG) than in group 2 (RME + HG), P < .05. No extrusion of first permanent molar occurred in either group (P > .05). Conclusion: The hypothesis was rejected. Cervical traction headgear alone produced greater distal movement effects in maxillary first permanent molars when compared with rapid maxillary expansion associated with cervical headgear.

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