Time dependent changes of variables associated with malocclusion in patients with Duchenne muscular dystrophy

2003 ◽  
Vol 27 (1) ◽  
pp. 53-61 ◽  
Author(s):  
Shinichi Matsumoto ◽  
Takanobu Morinushi ◽  
Tadashi Ogura
Keyword(s):  
Duchenne Muscular Dystrophy ◽  
Muscular Dystrophy ◽  
Developmental Stages ◽  
Open Bite ◽  
Craniofacial Morphology ◽  
Time Dependent ◽  
Mixed Dentition ◽  
Dental Arch ◽  
Transverse Expansion ◽  
Normal Occlusion

Time dependent changes of parameters associated with malocclusion in patients with Duchenne muscular dystrophy (DMD) were examined in four dental developmental stages in 34 patients.We adopted activities of daily living (ADL) score, dental arch, craniofacial morphology, and electromyograms of the masseter and temporalis muscle as parameters. A comparison was made with the results in DMD subjects to data from healthy subjects with normal occlusion reported in the literature. In DMD subjects, manifestations of open-bite were related to ADL score, sagittal shortening and transverse expansion of the dental arch and vertical overgrowth of the lower jaw. Posterior cross-bite malocclusion was associated with differences in the time dependent changes between the jaws in transverse expansion. The malocclusion in DMD subjects was also related to the time dependent disproportional changes in masticatory muscle function by EMG. Occlusal deviation in DMD subjects became apparent at the late mixed dentition and malocclusion became definitely manifest from early permanent dentition.

scholarly journals Evaluation of masticatory and salivary parameters in preschool children with different morphological occlusion

2017 ◽  
Vol 20 (2) ◽  
pp. 38
Author(s):  
Maria Carolina Salomé Marquezin ◽  
Clízia Genoveze Gauch ◽  
Camila Alvarez Siqueira ◽  
Fernanda Yukie Kobayashi ◽  
Fernando Luiz Affonso Fonseca ◽  
...  
Keyword(s):  
Preschool Children ◽  
Flow Rate ◽  
Bite Force ◽  
Primary Dentition ◽  
Open Bite ◽  
Dental Occlusion ◽  
Dental Arch ◽  
Early Assessment ◽  
Normal Occlusion ◽  
The Relationship

<p><strong>Objective:</strong> To better understand the relationship between malocclusion and masticatory and salivary functions in the primary dentition, the aim was to evaluate the differences in masticatory performance (MP), facial morphology (FM), maximal bite force (BF) and salivary parameters in 65 preschool children with normal occlusion (n = 22), functional posterior crossbite (n = 20) and anterior open bite (n = 23), and to explore the relationship between these variables. <strong>Material and Methods:</strong> MP, FM and BF were assessed by sieving method, anthropometry and gnatodynamometer, respectively. Stimulated (SS) and unstimulated (US) saliva flow and composition were measured by automated colorimetric technique. Data were analyzed using ANOVA/Kruskal-Wallis, t-test/Wilcoxon and Pearson/Spearman correlation test. The relationship between SS flow rate and the independent variables were assessed using multiple linear regression. <strong>Results:</strong> The lower face dimension was smaller in crossbite-group, and a decreased BF in the crossbite-side of the dental arch was observed. BF correlated positively with intergonial width in open bite group. In malocclusion groups, better MP correlated with byzigomatic and intergonial widths. US flow rate was lower in crossbite-group and total protein concentration differed between SS and US saliva only in the crossbite-group, being lower in US. Amylase activity was higher in SS than US in all groups. SS flow rate related positively with age and negatively with the presence of malocclusion. <strong>Conclusion:</strong> In young subjects, significant correlations were found between masticatory parameters and facial dimensions; in addition, some important masticatory and salivary parameters differed between children with different morphological occlusions, hence the importance of the early assessment of these parameters.</p><p><strong>KEYWORDS</strong></p><p><strong> </strong>Bite Force; Dental Occlusion; Masticatory System; Primary Dentition.</p>

Time‐dependent diffusion MRI as a probe of microstructural changes in a mouse model of Duchenne muscular dystrophy

2020 ◽  
Vol 33 (5) ◽  
Author(s):  
Paola Porcari ◽  
Matt G. Hall ◽  
Chris A. Clark ◽  
Elizabeth Greally ◽  
Volker Straub ◽  
...  
Keyword(s):  
Duchenne Muscular Dystrophy ◽  
Muscular Dystrophy ◽  
Mouse Model ◽  
Diffusion Mri ◽  
Time Dependent ◽  
Microstructural Changes

Intercanine Widening and Sagittal Effect of Maxillary Transverse Expansion in Patients with Cleft Lip and Palate during the Deciduous and Mixed Dentitions

1993 ◽  
Vol 30 (2) ◽  
pp. 195-207 ◽  
Author(s):  
Rolf S. Tindlund ◽  
Per Rygh ◽  
Olav E. Bøe
Keyword(s):  
Cleft Lip ◽  
Cleft Lip And Palate ◽  
Mixed Dentition ◽  
Orthopedic Treatment ◽  
Forward Movement ◽  
Transverse Expansion ◽  
Normal Occlusion ◽  
Lateral Cephalograms ◽  
Quad Helix ◽  
Maxillary Deficiency

Since 1977 cleft lip and palate (CLP) patients with maxillary deficiency have received an interceptive orthopedic treatment consisting of (a) transverse expansion, (b) protraction, and (c) fixed retention. Ideally the treatment should be completed early enough to permit spontaneous eruption of the maxillary permanent incisors into normal occlusion without orthodontic intervention. The early transverse expansion considerably increases space so that unerupted malpositioned incisors spread out spontaneously, creating optimal conditions for eruption and root formation. Dental diagnosis in the cleft areas is made easier. Posterior crossbites in 112 CLP patients were expanded with a modified quad-helix appliance cemented with four bands in the deciduous or mixed dentition. Intercanine widening was about 3 mm per month regardless of cleft type. Several authors have claimed that transverse expansion of the upper jaw will increase sagittal overjet. Other authors have not found such an effect. The sagittal effect on the maxilla was studied in 68 CLP patients who had received transverse expansion. Analysis of the lateral cephalograms revealed no significant sagittal dentofacial maxillary treatment effects involving forward movement of maxilla, but a downward clockwise rotation of the mandible was found.

scholarly journals Evaluation of Growth and Development of Late Mixed Dentition Upper Dental Arch with Normal Occlusion Using 3-Dimensional Digital Models

2019 ◽  
Vol 2019 ◽  
pp. 1-8
Author(s):  
Dapeng Yang ◽  
Shuran Liang ◽  
Ke Zhang ◽  
Weimin Gao ◽  
Yuxing Bai
Keyword(s):  
Growth And Development ◽  
Three Dimensional ◽  
Mixed Dentition ◽  
Dental Arch ◽  
3 Dimensional ◽  
Normal Occlusion ◽  
Dimensional Measurements ◽  
Dimensional Growth ◽  
Dental Arch Length ◽  
Beijing China

Objective. The purpose of this study was to observe the three-dimensional growth and development of the maxillary arch in 10-year-olds with normal occlusion during the late mixed dentition stage. Methods. Forty-four 10-year-old students (22 males and 22 females) who had normal occlusion during late mixed dentition were selected from an elementary school in Beijing, China. Once per year for three consecutive years, a dental cast was obtained from each subject, and the cast was scanned with a 3D digital scanner (R700 3D). The three-dimensional measurements of the maxillary dental arch and the inclination of the bilateral maxillary first molars were obtained from the digital model. Results. The upper anterior arch length (UAAL), upper total arch length (UTAL), upper inter primary or permanent canine width (UICW), upper intermolar width (UIMW), and upper dental arch length (UDAL) increased by 0.959 mm, 0.583 mm, 0.955 mm, 1.462 mm, and 2.46 mm, respectively, over the two years (P<0.001). UR6BL and UL6BL decreased by 4.416° and 7.133°, respectively, over the two years (P<0.001). The values of the UICW and UIMW were 1.67 mm and 1.86 mm, respectively, larger in males than in females at 12 years old (P<0.01). The change in the UTAL was 0.431 mm greater in males than in females over the 2 years (P<0.05). Conclusion. The UAAL, UTAL, UICW, UIMW, and UDAL in 10- to 12-year-olds with normal occlusion increased with age. The buccolingual inclination of the bilateral maxillary first molars inclined to the palatal side with age. The UICW and UIMW were larger in males than in females at 12 years old. The male UTAL increased more than the female UTAL over the 2 years.

scholarly journals Electromyographic features and efficacy of orofacial myofunctional treatment for skeletal anterior open bite in adolescents: an exploratory study

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Hong Hong ◽  
Yue Zeng ◽  
Xiaomin Chen ◽  
Caixia Peng ◽  
Jianqing Deng ◽  
...  
Keyword(s):  
Muscle Activity ◽  
Morphological Characteristics ◽  
Masticatory Muscles ◽  
Open Bite ◽  
Craniofacial Morphology ◽  
Electromyographic Activity ◽  
Anterior Open Bite ◽  
Normal Occlusion ◽  
Before And After ◽  
Vertical Height

Abstract Background Due to the multifactorial aetiology and unpredictable long-term stability, skeletal anterior open bite (SAOB) is one of the most intractable conditions for orthodontists. The abnormal orofacial myofunctional status (OMS) may be a major risk factor contributing to the development and relapse of SAOB. This study is aimed at evaluating the OMS and the efficacy of orofacial myofunctional therapy (OMT) alone for SAOB subjects. Methods Eighteen adolescents with SAOB (4 males, 14 females; age: 12–18 years) and eighteen adolescents with normal occlusion (2 males, 16 females; age: 12–18 years) were selected. The electromyographic activity (EMGA) associated with mastication and closed mouth state was measured. Lateral cephalography was used to evaluate craniofacial morphology. Wilcoxon signed rank tests and t-tests were performed to evaluate myofunctional and morphological differences. Pearson or Spearman correlation analysis was used to investigate the correlations between EMGA and morphological characteristics. SAOB subjects were given OMT for 3 months, and the EMGA was compared between before and after OMT. Results During rest, anterior temporalis activity (TAA) and mentalis muscle activity (MEA) increased in SAOB subjects, but TAA and masseter muscle activity (MMA) decreased in the intercuspal position (ICP); and upper orbicularis activity (UOA) and MEA significantly increased during lip sealing and swallowing (P < 0.05). Morphological evaluation revealed increases in the FMA, GoGn-SN, ANS-Me, N-Me, L1-MP, U6-PP, and L6-MP and decreases in the angle of the axis of the upper and lower central incisors and OB in SAOB subjects (P < 0.05). TAA, MMA and anterior digastric activity (DAA) in the ICP were negatively correlated with vertical height and positively correlated to incisor protrusion. MEA was positively correlated with vertical height and negatively correlated with incisor protrusion; and the UOA showed a similar correlation in ICP, during sealing lip and swallowing. After SAOB subjects received OMT, MEA during rest and TAA, MMA and DAA in the ICP increased, while UOA and MEA decreased (P < 0.05). Conclusion SAOB subjects showed abnormal OMS features including aberrant swallowing patterns and weak masticatory muscles, which were interrelated with the craniofacial dysmorphology features including a greater anterior facial height and incisor protrusion. Furthermore, OMT contributes to OMS harmonization, indicating its therapeutic prospect in SAOB.

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