Clear Expansion Plate: A Novel Technique

European Journal of General Dentistry ◽

10.1055/s-0041-1733303 ◽

2021 ◽

Author(s):

Ahmad Behroozian

Keyword(s):

Clinical Trials ◽

Early Intervention ◽

Mixed Dentition ◽

Posterior Crossbite ◽

Novel Technique ◽

Early Correction ◽

Positive Properties

Abstract Objectives Posterior crossbite is one of the most common orthodontic problems in primary and mixed dentition that induces deleterious and permanent effects on dentition, dentoskeletal structures, and esthetics. Early correction of unilateral and bilateral posterior crossbite is necessary to prevent these problems. Early intervention with removable Schwarz appliance is one of the useful appliances to correct posterior crossbite, but it has its own disadvantages. Materials and Methods In this article, we have presented a new appliance and method of fabrication to aid the expansion of the maxilla. Results The presented “clear expansion plate” that is made by thermoplastic sheets maintains all of the positive properties of the Schwarz plate and has several additional advantages. Conclusion After being tested in clinical trials, traditional expansion plate can be replaced by clear expansion plate.

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Early timely orthodontic treatment: Treatment of unerupted maxillary laterals

APOS Trends in Orthodontics ◽

10.25259/apos_27_2021 ◽

2021 ◽

Vol 11 ◽

pp. 4-13

Author(s):

Peter Ngan ◽

Mohamad Sarraj ◽

Ghaddy AlSaty

Keyword(s):

Early Intervention ◽

Orthodontic Treatment ◽

Case Reports ◽

Young Patients ◽

Mixed Dentition ◽

Maxillary Expansion ◽

Orthopedic Treatment ◽

Maxillary Protraction ◽

Posterior Crossbite ◽

Timely Treatment

There is no universal agreement as to which type of orthodontic or orthopedic treatment deserves early intervention. In addition, there is a need for more information as to which treatments are the most effective and less costly if they are initiated timely in the mixed dentition. Early timely treatment may benefit young patients with a maxillary transverse deficiency with or without a posterior crossbite that requires maxillary expansion. It may also be indicated in children with anteroposterior jaw discrepancy that requires chin cup or maxillary protraction. In this paper, the authors will focus on early maxillary expansion to facilitate the eruption of maxillary laterals. In specific, the authors will present a contemporary protocol using a bonded maxillary expander as anchorage for treatment of unerupted maxillary laterals. The use of this protocol was illustrated with two case reports to enable clinicians to routinely achieve a beautiful smile on a young patient by timely alignment of the maxillary incisors.

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Posterior Crossbite and Functional Changes

The Angle Orthodontist ◽

10.2319/030708-137.1 ◽

2009 ◽

Vol 79 (2) ◽

pp. 380-386 ◽

Cited By ~ 39

Author(s):

Anniceleda Silva Andrade ◽

Gustavo Hauber Gameiro ◽

Moara DeRossi ◽

Maria Beatriz Duarte Gavião

Keyword(s):

Clinical Trials ◽

Signs And Symptoms ◽

Masticatory Muscles ◽

Bite Force ◽

Mixed Dentition ◽

Functional Changes ◽

Posterior Crossbite ◽

Randomized Controlled ◽

Stomatognathic System

Abstract Objective: To assess, by systematically reviewing the literature, the functional changes of the masticatory muscles associated with posterior crossbite in the primary and mixed dentition. Materials and Methods: A literature survey from the Medline database covering the period from January 1965 to February 2008 was performed. Randomized controlled trials, controlled clinical trials, and clinical trials that evaluated bite force, surface electromyography, and signs and symptoms of temporomandibular disorders (TMD) were included. Two reviewers extracted the data independently and assessed the quality of the studies. Results: The search strategy resulted in 494 articles, of which 8 met the inclusion criteria. Children with posterior crossbite can have reduced bite force and asymmetrical muscle function during chewing or clenching, in which the anterior temporalis is more active and the masseter less active on the crossbite side than the noncrossbite side. Moreover, there is a significant association between posterior crossbite and TMD symptomatology. Conclusion: The consequences of the functional changes for the growth and development of the stomatognathic system deserves further investigation.

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Early Orthodontic Treatments of Unilateral Posterior Crossbite: A Systematic Review

Journal of Clinical Medicine ◽

10.3390/jcm10010033 ◽

2020 ◽

Vol 10 (1) ◽

pp. 33

Author(s):

Francesco Caroccia ◽

Francesco Moscagiuri ◽

Luigi Falconio ◽

Felice Festa ◽

Michele D’Attilio

Keyword(s):

Systematic Review ◽

Clinical Trials ◽

Randomized Clinical Trials ◽

Scientific Evidence ◽

Treatment Strategies ◽

Mixed Dentition ◽

Control Group ◽

Maxillary Expansion ◽

Posterior Crossbite ◽

Quad Helix

We aimed to report an update of the systematic review by Petrén et al. (2003). The objective was to evaluate how orthodontic treatments can affect unilateral posterior crossbite (UPXB) in primary and early mixed dentition. Several databases were consulted, and articles published between January 2002 and March 2020 were selected. This review examines the following studies: randomized clinical trials, prospective and retrospective studies with concurrent untreated or normal control groups, and clinical trials comparing at least two treatment strategies. Among the 1581 articles retrieved from the searches, 11 studies were included. Quad-helix (QH) and expansion plate (EP) appliances were compared in three studies. One study compared rapid maxillary expansion (RME) treatment anchored on primary dentition otherwise on permanent molars. One study compared RME and a modified RME with arms extended until deciduous canine and EP. Four studies evaluated the effects of expansion appliances compared with a control group. Compared with the previous review, the quality of the included studies is higher. However, heterogeneity of treatments, different strategies in measurements, lack of a similar follow-up length, and absence of a cost-effectiveness analysis preclude the possibility of providing reliable scientific evidence on the most effective UPXB treatment in primary and early mixed dentition.

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Early intervention for people at high risk of developing bipolar disorder: a systematic review of clinical trials

The Lancet Psychiatry ◽

10.1016/s2215-0366(20)30188-7 ◽

2021 ◽

Vol 8 (1) ◽

pp. 64-75 ◽

Cited By ~ 1

Author(s):

Gayatri Saraf ◽

Ehsan Moazen-Zadeh ◽

Jairo Vinícius Pinto ◽

Kimia Ziafat ◽

Ivan J Torres ◽

...

Keyword(s):

Systematic Review ◽

Bipolar Disorder ◽

Clinical Trials ◽

Early Intervention ◽

High Risk

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Three-dimensional evaluation of forced unilateral posterior crossbite correction in the mixed dentition: a randomized controlled trial

European Journal of Orthodontics ◽

10.1093/ejo/cjz054 ◽

2019 ◽

Vol 42 (4) ◽

pp. 415-425 ◽

Cited By ~ 1

Author(s):

Ola Sollenius ◽

Aljaž Golež ◽

Jasmina Primožič ◽

Maja Ovsenik ◽

Lars Bondemark ◽

...

Keyword(s):

Controlled Trial ◽

Three Dimensional ◽

Mixed Dentition ◽

Projection Area ◽

Treatment Groups ◽

Posterior Crossbite ◽

Randomized Controlled ◽

Normal Occlusion ◽

Treatment Changes ◽

Quad Helix

Summary Objectives The objectives of this study were to assess the three-dimensional (3D) treatment changes (palatal surface area and volume) of forced unilateral posterior crossbite correction using either quad-helix or removable expansion plate appliances in the mixed dentition, and to compare the treatment changes with the three-dimensional changes occurring in age-matched untreated unilateral posterior crossbite patients as well as in subjects with normal occlusion and with no or mild orthodontic treatment need. Trial design Six-arm parallel group multicentre randomized controlled trial. Materials and methods One-hundred and thirty-five patients with unilateral posterior crossbite with functional shift were recruited. The patients were randomized by an independent person not involved in the trial. The randomization used blocks of 25, and the patients were randomized into the following five groups: quad-helix treatments in specialist orthodontic clinics (QHS), quad-helix treatments in general dentistry (QHG), removable expansion plate treatments in specialist orthodontic clinics (EPS), removable expansion plate treatments in general dentistry (EPG), and untreated crossbite (UC). Twenty-five patients with normal occlusion who served as normal controls were also included in the trial. Blinding of the outcome assessor and data analyst was accomplished. Data on all children were evaluated on an intention-to-treat basis, regarding 3D palatal surface area, palatal projection area, and palatal shell volume; two-dimensional linear measurements were registered at the same time. Results After treatment, the surface and projection area and shell volume increased in the four treatment groups (QHS, QHG, EPS, and EPG). QHS increased significantly more than EPG for the surface and projection area. The QHS and EPS had significantly higher mean difference for shell volume. Limitations The trial considers a short-term evaluation. Conclusion After treatment, there were no significant differences between the four treatment groups and the normal group, which implies that the surface and projection area together with the shell volume for the four treatment groups and the normal group were equivalent. Trial registration The trial was registered with https://www.researchweb.org/is/sverige, registration number: 220751.

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Global distribution of malocclusion traits: A systematic review

Dental Press Journal of Orthodontics ◽

10.1590/2177-6709.23.6.40.e1-10.onl ◽

2018 ◽

Vol 23 (6) ◽

pp. 40.e1-40.e10 ◽

Cited By ~ 17

Author(s):

Maged Sultan Alhammadi ◽

Esam Halboub ◽

Mona Salah Fayed ◽

Amr Labib ◽

Chrestina El-Saaidi

Keyword(s):

Class Ii ◽

Permanent Dentition ◽

Open Bite ◽

Mixed Dentition ◽

Class I ◽

Pool Data ◽

Class Iii ◽

Class Iii Malocclusion ◽

Posterior Crossbite ◽

Electronic Search

Abstract Objective: Considering that the available studies on prevalence of malocclusions are local or national-based, this study aimed to pool data to determine the distribution of malocclusion traits worldwide in mixed and permanent dentitions. Methods: An electronic search was conducted using PubMed, Embase and Google Scholar search engines, to retrieve data on malocclusion prevalence for both mixed and permanent dentitions, up to December 2016. Results: Out of 2,977 retrieved studies, 53 were included. In permanent dentition, the global distributions of Class I, Class II, and Class III malocclusion were 74.7% [31 - 97%], 19.56% [2 - 63%] and 5.93% [1 - 20%], respectively. In mixed dentition, the distributions of these malocclusions were 73% [40 - 96%], 23% [2 - 58%] and 4% [0.7 - 13%]. Regarding vertical malocclusions, the observed deep overbite and open bite were 21.98% and 4.93%, respectively. Posterior crossbite affected 9.39% of the sample. Africans showed the highest prevalence of Class I and open bite in permanent dentition (89% and 8%, respectively), and in mixed dentition (93% and 10%, respectively), while Caucasians showed the highest prevalence of Class II in permanent dentition (23%) and mixed dentition (26%). Class III malocclusion in mixed dentition was highly prevalent among Mongoloids. Conclusion: Worldwide, in mixed and permanent dentitions, Angle Class I malocclusion is more prevalent than Class II, specifically among Africans; the least prevalent was Class III, although higher among Mongoloids in mixed dentition. In vertical dimension, open bite was highest among Mongoloids in mixed dentition. Posterior crossbite was more prevalent in permanent dentition in Europe.

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Prevalence of malocclusion and occlusal traits in the early mixed dentition in Shanghai, China

PeerJ ◽

10.7717/peerj.6630 ◽

2019 ◽

Vol 7 ◽

pp. e6630

Author(s):

Xin Yu ◽

Hao Zhang ◽

Liangyan Sun ◽

Jie Pan ◽

Yuehua Liu ◽

...

Keyword(s):

Primary Schools ◽

Sagittal Plane ◽

Epidemiological Data ◽

Open Bite ◽

Mixed Dentition ◽

Class Iii ◽

Cross Sectional Survey ◽

Cross Sectional ◽

Anterior Crowding ◽

Posterior Crossbite

BackgroundEpidemiological data on malocclusion among Chinese children are scant. The aim of this study was to provide detailed information on the prevalence of malocclusion in early mixed dentition children in Shanghai, China.MethodsA cross-sectional survey was conducted from September 2016 to April 2017, and 2,810 children aged 7- to 9- years were selected from 10 primary schools by cluster random sampling. Several occlusal parameters, including Angle molar relationship, overjet, overbite, open bite, anterior and posterior crossbite, midline displacement, scissors bite, and teeth crowding and spacing, were clinically registered by five calibrated orthodontic dentists.ResultsWe found that 79.4% children presented one or more occlusal anomalies. Angle Class I, Class II and Class III molar relationship were recorded in 42.3%, 50.9% and 5.9% of the sample, respectively. The proportion of Class III increased from 5.0% at age 7 to 7.8% at age 9. In the sagittal plane, increased overjet >3 mm was observed in 40.8% subjects, while the prevalence of severe overjet (>8 mm), anterior edge-to-edge (zero overjet) and anterior crossbite were 5.2%, 8.1% and 10.5%, respectively. Vertically, deep overbite >2/3 overlap was found in 6.2% of the children and open bite in 4.3%. Boys exhibited a higher rate of overbite than girls. For the transversal occlusal anomalies, 36.1% of the children had a midline displacement, which was followed by posterior crossbite (2.6%) and scissors bite (1.0%). Teeth space discrepancies were also common anomalies and anterior crowding (>2 mm) affecting 28.4% of the children, while anterior spacing (>4 mm) affecting 9.5%. Girls showed a higher prevalence of anterior crowding and a lower frequency of teeth spacing than boys.ConclusionsOur study demonstrated that malocclusion is prevalent among children in the early mixed dentition, and more health resources should be warranted to meet the challenge of prevention or early intervention of malocclusion.

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Evaluation of Changes in Muscle Thickness, Bite Force and Facial Asymmetry during Early Treatment of Functional Posterior Crossbite

Journal of Clinical Pediatric Dentistry ◽

10.17796/jcpd.34.4.656rh557093373k4 ◽

2010 ◽

Vol 34 (4) ◽

pp. 369-374 ◽

Cited By ~ 8

Author(s):

Paula Midori Castelo ◽

Maria Beatriz Duarte Gavião ◽

Luciano José Pereira ◽

Leonardo Rigoldi Bonjardim

Keyword(s):

Early Treatment ◽

Repeated Measures ◽

Muscle Thickness ◽

Facial Asymmetry ◽

Bite Force ◽

Mixed Dentition ◽

Stepwise Multiple Regression ◽

Masticatory Muscle ◽

Maxillary Expansion ◽

Posterior Crossbite

Objective: To determine morphological and functional effects on masticatory system of early treatment of functional posterior crossbite in young children. Study design: 23 children were divided into two groups:deciduous (DecG, n=11) and early mixed dentition (MixG, n=12), which received slow maxillary expansion. Maximal bite force, ultrasonographic masticatory muscle thickness and facial asymmetry were evaluated in three stages: before the start of treatment (s1), after three months of retention (s2), and after three months of observation (s3). The results were analyzed by Mann-Whitney U-test, correlation test, repeated measures ANOVA and backward stepwise multiple regression. Results. Bite force and temporalis thickness increased from s1 to s2 and s3 in both groups (p<0.05). Body mass index (BMI) increased significantly from s1 to s3 only in the MixG, but the masseter thickness did not differ among the stages. The correlation between the angle of the eye and the angle of the mouth in relation to the mid-sagital plane increased from s1 to s3. Masticatory muscle thickness contributed significantly to bite force magnitude in all stages, whereas age and BMI showed no significant contribution to its variation. Conclusion: Bite force and temporalis muscle thickness increased significantly in children after early treatment of functional crossbite.

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