Orthodontic Arch Development and Functional Appliances in Penrith

Expansion and bite-correction appliances for children, teenagers and adults

Best Western Dental Centre provides removable and fixed orthodontic appliances for dental arch development, space creation and selected bite problems.

Dr Nathan Le commonly uses Schwarz appliances, Williams lower fixed appliances, fixed upper expansion appliances, 3D Schwarz appliances, RN-Sagittal appliances and ALF appliances.

The appliance selected depends on the patient’s age, dental development, crowding, dental arch shape, bite, jaw relationships, supporting bone and gums, remaining growth and ability to cooperate with treatment.

Dr Le generally prefers a non-extraction approach. Where clinically appropriate, dental arch development may create space for crowded or erupting teeth. However, expansion must remain within safe biological limits and does not guarantee that extractions or further orthodontic treatment will be avoided.

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What are arch-development and functional appliances?

An arch-development appliance is designed to change the width, length or shape of a dental arch or create space for developing teeth.

A functional appliance is generally intended to influence how the upper and lower teeth and jaws meet, particularly while a patient is growing.

Depending on its design, an appliance may help address:

Narrow dental arches
Crowded or overlapping teeth
Insufficient space for permanent teeth
Selected anterior or posterior crossbites
A large overjet or deep bite
Selected Class I, Class II or Class III bite concerns
Teeth erupting in an unfavourable position
Differences between the upper and lower arch forms
Preparation for braces or clear aligners

An examination and appropriate diagnostic records are needed to determine whether appliance treatment is suitable.

Appliances commonly used by Dr Le

Removable Schwarz appliance

A Schwarz appliance is a custom-made removable acrylic plate that may be used in the upper or lower dental arch.

It usually contains an expansion screw, clasps and other components selected according to the treatment objectives. It may be used to:

Develop dental arch width
Improve dental arch shape
Create space for crowded or erupting teeth
Correct selected dental crossbites
Assist movement of individual teeth

The screw may need to be activated at home according to a prescribed schedule. It should not be activated more frequently than instructed.

Because the appliance is removable, successful treatment depends on consistent wear.

Williams lower fixed appliance

The Williams appliance is a fixed lower arch-development appliance commonly used during the early mixed-dentition stage, when a child has both baby and permanent teeth.

It generally incorporates a mechanism for posterior arch development and a light wire acting around the lower front teeth.

Depending on its design, it may help:

Develop the lower dental arch
Create space for permanent teeth
Improve selected lower front-tooth crowding
Improve lower dental arch form
Reduce dependence on removable-appliance wear

The appliance remains attached to the teeth between appointments. Careful cleaning, appropriate food choices and regular reviews are required.

The changes are mainly dentoalveolar, affecting the teeth and their supporting dental arch. Development must remain within the limits of the surrounding bone and gums.

Fixed upper expansion appliance

A fixed upper expansion appliance may be used when the upper dental arch is narrow or when additional space or crossbite correction is required.

Depending on its design, it may help:

Develop the upper dental arch
Correct a selected posterior crossbite
Create space for permanent teeth
Improve coordination between the upper and lower arches
Prepare for a later stage of orthodontic treatment

Because it remains attached to the teeth, treatment does not depend on the patient remembering to insert the appliance.

Different fixed expanders produce different types of dental and skeletal change. The response depends on the design, activation schedule, age and stage of dental development.

3D Schwarz appliance

A 3D Schwarz appliance is designed to develop the upper dental arch in more than one direction.

It may be used to increase transverse width and available arch length according to the individual treatment plan. It may be considered for:

Upper arch narrowing
Crowding or insufficient space
Selected crossbites
Development required in more than one direction
Selected Class III dental relationships

The appliance design and activation schedule are individually prescribed.

Upper RN-Sagittal appliance

An RN-Sagittal appliance is generally used in the permanent dentition to develop the upper dental arch in both the transverse and front-to-back directions.

For selected teenagers and adults, it may be used to:

Increase upper dental arch width
Increase available arch length
Create space for tooth alignment
Improve the position of selected teeth
Assist with correction of a deep bite when designed for this purpose
Support correction of selected Class II dental relationships
Prepare for braces or clear aligners

For selected Class II patients, Dr Le may combine an upper RN-Sagittal appliance with a lower ALF appliance as part of coordinated upper and lower dental arch development.

In adults, treatment primarily produces dentoalveolar changes involving the teeth and supporting dental arch. It should not be expected to restart or substantially change completed jaw growth.

Lower ALF appliance

The Advanced Lightwire Functional, or ALF, appliance uses light wires positioned mainly along the inside of the teeth.

Dr Le may use a lower ALF appliance to support lower dental arch development while an RN-Sagittal appliance is used in the upper arch.

ALF may be considered for selected children, teenagers and adults. Suitability depends on the teeth, bite, dental arches, supporting tissues and treatment objectives.

LEARN ABOUT ALF APPLIANCES

Myobrace

Myobrace combines a removable appliance with prescribed activities focusing on tongue posture, swallowing, lip seal and nasal breathing.

It has a different primary purpose from a custom arch-development appliance but may form part of a broader orthodontic plan when appropriate.

LEARN ABOUT MYOBRACE

Twin Block appliance

A Twin Block is a removable functional appliance that may be used during growth to guide the lower jaw into a forward position in selected Class II cases.

Dr Le uses Twin Block appliances less frequently because successful treatment requires very consistent patient wear. Another appliance approach may be recommended when cooperation is likely to be difficult.

Appliance treatment for different bite relationships

Class I crowding and expansion

A Class I patient may have a relatively balanced upper-to-lower jaw relationship but still have narrow arches, crowding, insufficient space or a crossbite.

Where clinically appropriate, Dr Le may recommend upper or lower dental arch development to create space and improve coordination between the arches.

Treatment may involve a Schwarz appliance, Williams lower fixed appliance, fixed upper expansion appliance, 3D Schwarz, ALF, braces or clear aligners.

The objective is to develop the dental arches and improve tooth alignment without unnecessarily changing a satisfactory Class I jaw relationship.

Class II treatment

A Class II bite may involve relatively prominent upper teeth, a retrusive lower dental arch or jaw, or a combination of dental and skeletal factors.

For selected teenagers and adults, Dr Le may use an upper RN-Sagittal appliance with a lower ALF appliance when coordinated dental arch development forms part of treatment.

The RN-Sagittal may also assist with selected deep bites when designed for this purpose.

Braces or clear aligners may follow to provide more precise tooth alignment and bite refinement.

Class III treatment

A Class III bite may involve the lower teeth or jaw being positioned relatively forward, insufficient development of the upper dental arch, or a combination of dental and skeletal factors.

For selected patients, Dr Le may use a 3D Schwarz appliance and fixed orthodontic appliances. The 3D Schwarz may assist upper arch development, while fixed appliances provide more precise control of tooth position and bite correction.

Treatment depends on the patient’s age, growth, severity and whether the discrepancy is mainly dental or skeletal. Patients with a significant skeletal discrepancy may benefit from specialist orthodontic or oral and maxillofacial surgical assessment.

How is an appliance selected?

Dr Le considers:

The patient’s age and dental development
The amount and location of crowding
Dental arch width, length and shape
The position of the teeth within the supporting bone
Crossbite, overjet and overbite
Class I, Class II or Class III relationships
Facial and dental proportions
Remaining growth
Gum and bone health
Likely cooperation with removable-appliance wear
The need for later braces or clear aligners
Long-term stability

Patients with the same bite classification may require different treatment because the underlying causes and treatment objectives can differ.

The treatment process

1. Free initial orthodontic consultation

Best Western Dental Centre offers one free initial orthodontic consultation per person for patients from six years of age.

A suitable OPG taken within the previous six months is required. If you already have one, please arrange for it to be sent to our practice before the appointment.

If a suitable recent OPG is unavailable, one can be arranged at our practice. The applicable radiograph fee will be explained when booking.

2. Diagnostic records and planning

Further records may include:

Digital scans of the teeth
Clinical photographs
An OPG
A lateral cephalometric radiograph
Measurements of the teeth, bite and jaw relationships
Assessment of dental development and remaining growth

Dr Le reviews the records before recommending an individual treatment plan.

The proposed appliance, alternatives, limitations, expected wear, estimated duration, fees and possibility of later orthodontic treatment will be explained before treatment begins.

3. Appliance fitting

At the fitting appointment, instructions are provided about:

Inserting and removing the appliance
Required daily wear
Whether it should be worn while eating
Screw activation, if applicable
Cleaning and storage
Food restrictions
What to do if it becomes uncomfortable or damaged

4. Regular reviews

Review appointments are required to monitor appliance fit, dental arch development, bite changes, tooth eruption, cooperation, oral hygiene and progress.

The appliance may need to be adjusted, modified or replaced during treatment.

How long does treatment take?

Treatment time depends on the original orthodontic problem, appliance prescribed, amount of correction, age, dental development, cooperation and individual response.

Some limited corrections may take several months. More extensive arch development or bite correction may take longer and may be followed by braces or clear aligners.

Any treatment timeframe provided is an estimate and may change according to progress.

Looking after an orthodontic appliance

Patients should:

Follow the prescribed wearing and activation schedule
Clean the appliance as instructed
Brush carefully around fixed components
Store removable appliances in their protective case
Bring the appliance to every review
Keep removable appliances away from pets and heat
Contact the practice if the appliance becomes loose, damaged or uncomfortable

Do not activate a screw more frequently than prescribed, bend wires at home or continue wearing a sharp, loose or badly broken appliance without contacting the practice.

Repair or replacement charges may apply if an appliance is lost or damaged.

Will braces still be required?

Possibly.

Arch-development and functional appliances may create space, improve the dental arches or address selected bite relationships, but they do not always provide detailed alignment of every tooth.

Braces or clear aligners may later be recommended to:

Align and level the teeth
Close remaining spaces
Coordinate the dental arches
Refine the bite
Complete the planned tooth movements

When a second stage is anticipated, it does not mean that appliance treatment was unsuccessful. Each stage has a different purpose.

About Dr Nathan Le

Dr Nathan Le completed his Bachelor of Dental Surgery at the University of Sydney in 1999. He is a general dentist with a clinical interest in orthodontics and dentofacial orthopaedics.

He provides orthodontic arch development, functional appliances, Myobrace, ALF appliances, fixed braces and clear aligner treatment.

Dr Le generally prefers to preserve healthy teeth and develop the dental arches where clinically appropriate.

He is not a registered specialist orthodontist. If a patient would benefit from specialist orthodontic or surgical assessment, an appropriate referral can be discussed.

MEET DR NATHAN LE

Frequently asked questions

Is expansion only for Class II or Class III patients?

No. A Class I patient may have a satisfactory general jaw relationship but still have narrow arches, crowding, insufficient space or a crossbite that may benefit from appropriate dental arch development.

Can teenagers and adults have appliance treatment?

Yes. Selected appliances may be used for teenagers and adults. Adult treatment generally produces dentoalveolar changes rather than modifying completed jaw growth.

The health and position of the teeth, gums and supporting bone must be assessed.

Does expansion prevent extractions?

Arch development may create space and support non-extraction treatment in suitable patients. However, extractions cannot always be avoided, and a non-extraction result cannot be guaranteed before full assessment.

Does appliance treatment hurt?

Patients may initially experience pressure, mild tenderness, increased saliva or changes in speech. These effects commonly improve as the mouth adapts.

Persistent pain, rubbing or an appliance that no longer fits should be assessed.

Is a fixed appliance better than a removable appliance?

Not necessarily. A fixed appliance reduces dependence on remembering to wear it, while a removable appliance may be appropriate when the patient can cooperate consistently. The required tooth or arch movement determines which is more suitable.

Request an orthodontic appliance consultation in Penrith

Contact Best Western Dental Centre if you are concerned about crowding, narrow dental arches, crossbite, overjet, deep bite or the relationship between the upper and lower teeth.

Best Western Dental Centre
95 Oxford Street
Cambridge Park, Penrith NSW 2747
Telephone: (02) 4731 4655