Maxillary Skeletal Changes Concomitant With Different Levels of Force Application for Maxillary Protraction in Growing Class 3 Patients

ABSTRACT Objective: To evaluate the treatment effects of a hybrid hyrax-facemask (FM) combination in growing Class III patients. Material and Methods: A sample of 16 prepubertal patients (mean age, 9.5 ± 1.6 years) was investigated by means of pre- and posttreatment cephalograms. The treatment comprised rapid palatal expansion with a hybrid hyrax, a bone- and toothborne device. Simultaneously, maxillary protraction using an FM was performed. Mean treatment duration was 5.8 ± 1.6 months. The treatment group was compared with a matched control group of 16 untreated Class III subjects. Statistical comparisons were performed with the Mann-Whitney U-test. Results: Significant improvement in skeletal sagittal values could be observed in the treatment group over controls: SNA: 2.4°, SNB: −1.7°, Co-Gn: −2.3 mm, Wits appraisal: 4.5 mm. Regarding vertical changes, maintenance of vertical growth was obtained as shown by a small nonsignificant increase of FMA and a small significant decrease of the Co-Go-Me angle. Conclusions: The hybrid hyrax-FM combination was found to be effective for orthopedic treatment in growing Class III patients in the short term. Favorable skeletal changes were observed both in the maxilla and in the mandible. No dentoalveolar compensations were found.

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Skeletal Changes in Growing Cleft Patients with Class III Malocclusion Treated with Bone Anchored Maxillary Protraction—A 3.5-Year Follow-Up

Journal of Clinical Medicine ◽

10.3390/jcm10040750 ◽

2021 ◽

Vol 10 (4) ◽

pp. 750

Author(s):

Ralph M. Steegman ◽

Annemarlien Faye Klein Meulekamp ◽

Arjan Dieters ◽

Johan Jansma ◽

Wicher J. van der Meer ◽

...

Keyword(s):

Controlled Trial ◽

Three Dimensional ◽

Control Group ◽

Class Iii ◽

Class Iii Malocclusion ◽

Maxillary Protraction ◽

Gonial Angle ◽

Positive Effects ◽

Skeletal Changes

This prospective controlled trial aimed to evaluate the skeletal effect of 3.5-years bone anchored maxillary protraction (BAMP) in growing cleft subjects with a Class III malocclusion. Subjects and Method: Nineteen cleft patients (11.4 ± 0.7-years) were included from whom cone beam computed tomography (CBCT) scans were taken before the start of BAMP (T0), 1.5-years after (T1) and 3.5 y after (T2). Seventeen age- and malocclusion-matched, untreated cleft subjects with cephalograms available at T0 and T2 served as the control group. Three dimensional skeletal changes were measured qualitatively and quantitatively on CBCT scans. Two dimensional measurements were made on cephalograms. Results: Significant positive effects have been observed on the zygomaticomaxillary complex. Specifically, the A-point showed a displacement of 2.7 mm ± 0.9 mm from T0 to T2 (p < 0.05). A displacement of 3.8 mm ± 1.2 mm was observed in the zygoma regions (p < 0.05). On the cephalograms significant differences at T2 were observed between the BAMP and the control subjects in Wits, gonial angle, and overjet (p < 0.05), all in favor of the treatment of Class III malocclusion. The changes taking place in the two consecutive periods (ΔT1-T0, ΔT2-T1) did not differ, indicating that not only were the positive results from the first 1.5-years maintained, but continuous orthopedic effects were also achieved in the following 2-years. Conclusions: In conclusion, findings from the present prospective study with a 3.5-years follow-up provide the first evidence to support BAMP as an effective and reliable treatment option for growing cleft subjects with mild to moderate Class III malocclusion up to 15-years old.

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Effect of Expertise on 3D Force Application During the Starting Block Phase and Subsequent Steps in Sprint Running

Journal of Applied Biomechanics ◽

10.1123/jab.2013-0017 ◽

2014 ◽

Vol 30 (3) ◽

pp. 390-400 ◽

Cited By ~ 21

Author(s):

Mitsuo Otsuka ◽

Jae Kun Shim ◽

Toshiyuki Kurihara ◽

Shinsuke Yoshioka ◽

Makoto Nokata ◽

...

Keyword(s):

Reaction Force ◽

Three Dimensional ◽

The Other ◽

Whole Body ◽

Force Application ◽

Maximum Effort ◽

The Mean ◽

Anterior Direction ◽

Different Levels ◽

Block Start

In sprinters with different levels of block acceleration, we investigated differences in their three-dimensional force application in terms of the magnitude, direction, and impulse of the ground reaction force (GRF) during the starting block phase and subsequent two steps. Twenty-nine participants were divided into three groups (well-trained, trained, and nontrained sprinters) based on their mean anteroposterior block acceleration and experience with a block start. The participants sprinted 10 m from a block start with maximum effort. Although the mean net resultant GRF magnitude did not differ between the well-trained and trained sprinters, the net sagittal GRF vector of the well-trained sprinters was leaned significantly further forward than that of the trained and nontrained sprinters during the starting block phase. In contrast, during the starting block phase and the subsequent steps, the transverse GRF vectors which cause the anteroposterior and mediolateral acceleration of the whole-body was directed toward the anterior direction more in the well-trained sprinters as compared with the other sprinters. Therefore, a more forward-leaning GRF vector and a greater anteroposterior GRF may particularly allow well-trained sprinters to generate a greater mean anteroposterior block acceleration than trained and nontrained sprinters.

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Dental and Skeletal Changes after Transpalatal Distraction

BioMed Research International ◽

10.1155/2020/5814103 ◽

2020 ◽

Vol 2020 ◽

pp. 1-7

Author(s):

Ewa Zawiślak ◽

Hanna Gerber ◽

Rafał Nowak ◽

Marcin Kubiak

Keyword(s):

Bone Growth ◽

Arch Width ◽

Skeletal Changes ◽

Rotation Pattern ◽

Diagnostic Models ◽

Maxillary Constriction ◽

Maxillary Deficiency ◽

Different Levels ◽

Craniofacial Abnormality ◽

Intercanine Distance

Maxillary constriction is a common skeletal craniofacial abnormality, and transverse maxillary deficiency affects 30% of patients receiving orthodontic and surgical treatment. The aim of the study was to analyse craniofacial skeletal changes in adults with maxillary constriction after transpalatal distraction. The study group consisted of 36 patients (16 women) aged 17 to 42 years (M = 27.1; SD = 7.8) with a known complete skeletal crossbite and who underwent transpalatal distraction procedure. The measurements were obtained on diagnostic models, and cephalometric PA radiograms were obtained at time points, i.e., before treatment (T1) and after the completion of active distraction (T2). The analysis of diagnostic models involving the arch width measurement at different levels demonstrated a significant increase in L1, L2, L3, L4, L5, and L6 dimensions after transpalatal distraction. The largest width increase (9.5 mm) was observed for the L3 dimension (the intercanine distance). The analysis of frontal cephalograms displayed a significant increase in W1, W2, and W3 dimensions after transpalatal distraction. The largest width increase (4.9 mm) was observed for the W1 dimension at the level of the alveolar process of the maxilla. Transpalatal distraction is an effective treatment for transverse maxillary deficiency after the end of bone growth. The expansion observed on diagnostic models is close to a parallel segment shift mechanism, with a mild tendency towards a larger opening anteriorly. The maxillary segment rotation pattern analysed based on the frontal cephalograms is close to a hand fan unfolding with the rotation point at the frontonasal suture.

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Dependence of Intergranular Fracture on Boundary Topography and Cohesion

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100071193 ◽

1973 ◽

Vol 31 ◽

pp. 150-151

Author(s):

J. E. Doherty ◽

A. F. Giamei ◽

B. H. Kear ◽

C. W. Steinke

Keyword(s):

Grain Boundary ◽

Room Temperature ◽

Nickel Base Superalloy ◽

Boundary Shear ◽

Room Temperature Ductility ◽

Solid Solution Matrix ◽

Nickel Base ◽

Solution Matrix ◽

Different Levels ◽

Base Superalloy

Recently we have been investigating a class of nickel-base superalloys which possess substantial room temperature ductility. This improvement in ductility is directly related to improvements in grain boundary strength due to increased boundary cohesion through control of detrimental impurities and improved boundary shear strength by controlled grain boundary micros true tures.For these investigations an experimental nickel-base superalloy was doped with different levels of sulphur impurity. The micros tructure after a heat treatment of 1360°C for 2 hr, 1200°C for 16 hr consists of coherent precipitates of γ’ Ni3(Al,X) in a nickel solid solution matrix.

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Immunoenzymatic demonstration of the simultaneous presence of transferrin, hemopexin and albumin in a same hepatocyte and their ultrastructural localization

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100081309 ◽

1978 ◽

Vol 36 (2) ◽

pp. 88-89

Author(s):

M. Kraemer ◽

J. Foucrier ◽

J. Vassy ◽

M.T. Chalumeau

Keyword(s):

Plasma Proteins ◽

Rat Hepatocytes ◽

Ultrastructural Localization ◽

Carrier Proteins ◽

Normal Cells ◽

Adult Rat ◽

Adult Rat Hepatocytes ◽

Monospecific Antisera ◽

Different Levels

Some authors using immunofluorescent techniques had already suggested that some hepatocytes are able to synthetize several plasma proteins. In vitro studies on normal cells or on cells issued of murine hepatomas raise the same conclusion. These works could be indications of an hepatocyte functionnal non-specialization, meanwhile the authors never give direct topographic proofs suitable with this hypothesis.The use of immunoenzymatic techniques after obtention of monospecific antisera had seemed to us useful to bring forward a better knowledge of this problem. We have studied three carrier proteins (transferrin = Tf, hemopexin = Hx, albumin = Alb) operating at different levels in iron metabolism by demonstrating and localizing the adult rat hepatocytes involved in their synthesis.Immunological, histological and ultrastructural methods have been described in a previous work.

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Storybook Reading Approach: Outcomes With Two Children With Language and Phonological Impairments Exhibiting Different Levels of Phonological Consistency

Contemporary Issues in Communication Science and Disorders ◽

10.1044/cicsd_43_s_1 ◽

2016 ◽

Vol 43 (Spring) ◽

pp. 1-10

Author(s):

Monica Bellon-Harn ◽

Maggie Credeur-Pampolina

Keyword(s):

Storybook Reading ◽

Phonological Consistency ◽

Different Levels

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