What is a Maryland bridge?
A Maryland bridge is used to replace missing tooth / teeth especially in cases of front teeth.
It is commonly used in replacing central or lateral incisors. These bridges have a false tooth and wings extension on one or both sides which is glued to the inner aspect of the adjacent teeth.
This is one of many available restorative methods which is considered minimally invasive and conservative of tooth tissue. The crown is made up of porcelain fused to metal or ceramic and the wings extensions are metal.
Why is it called Maryland bridge?
There is an interesting story behind this name. It is not named after the state of Maryland, nor was it really invented anywhere in the state of Maryland. The technique was probably invented by Dr. Stewart R Halbauer, a Glendal, Ohio dentist. Later the University of Maryland popularized this technique, and hence, came to be known as the Maryland bridge.
What is the difference between a traditional and a Maryland bridge?
|Traditional bridges||Maryland Bridges|
|Traditional bridges requires the entire coverage of the adjacent teeth which is used for the supporting the bridge.||Maryland bridge takes support from a relatively smaller area from the adjacent teeth on the lingual side (inner side).|
|More extensive tooth preparation or trimming of the adjacent teeth is required.||Very little trimming or preparation is required.|
|It can replace both front or back missing tooth or teeth with good strength and greater support.||It can replace front teeth with good aesthetics but better to avoid where the masticatory forces (forces while swallowing) are considerably high, like in case of back teeth.|
|Traditional bridges are preferred when a long bridge is required to replace more than 1 missing tooth.||They are at greater risk of failure if used to replace several missing teeth in a row.|
What materials are required to prepare a Maryland bridge?
The materials commonly used are metal, porcelain and composites.
Metal: The tooth to be replaced is made up of metal like stainless steel substructure that is a non-perforated and sandblasted non-precious metal. It is not aesthetically acceptable as it gives metallic and artificial appearance.
Porcelain: These frameworks can be designed by wax-up mocks or using CAD-CAM. The main advantage of this type of bridge is the aesthetics as well as good biocompatibility and lower levels of plaque accumulation.
The wings extensions are comparatively thicker and larger than metal ones. Greater bulk is required for resistance of material fracture. Recently Emax, Cercon LAVA are used which gives amazing results, especially when used in front teeth.
Composites: Fiber-reinforced composites are preferred over traditional composites because of the greater strength. Areas predicted to have high stress, benefit from having fibres in one direction (unidirectional) which can improve the mechanical properties.
These bridges can be fabricated in the mouth during a single visit or in a dental laboratory.
Who Can Get Maryland Bridges?
Maryland bridges are ideal for patients who are looking for a reliable and aesthetic solution for replacing their missing front teeth. However, not all patients with missing teeth are eligible candidates for getting Maryland bridges. These bridges are offered to only those individuals who do not have cavities on the supporting teeth, and have an excellent oral hygiene.
Indications of Maryland bridge:
- Replacement of single missing teeth
- Missing teeth in anterior or front region where aesthetics is main concern - a fixed type of porcelain Maryland bridge is indicated.
- When the adjacent teeth has laminates on the facial or outer surface where full tooth preparation is to be avoided.
- Good height and sound enamel of the abutment capable of supporting the bridge.
- Tooth in arch curvature - Fixed movable type of Maryland bridge is recommended.
- Good moisture control.
- Healthy oral cavity and good maintenance.
Contraindications of maryland bridge:
- Several missing teeth in a row.
- Rear teeth where the forces while swallowing are very high.
- Crowded teeth, because of the higher chances of dislodgement of the bridge.
- Carious abutment - cavities in the abutment causes failure as the cavity progresses over time. Also it mechanically weakens the tooth structure. Carious abutment should be treated by caries removal and restoration along with full crown and bridge to replace the missing teeth.
- Deep closure of mouth - deepbite.
- Severly proclined front teeth, which are more prone to trauma.
- Crowding of teeth with little space for tooth replacement.
- Parafuntional habits like night grinding or bruxism.
- Sensitivity to nickel.
How are they Prepared?
The method of fabrication of Maryland bridges is slightly different from the other types of teeth bridges. This is because there is minimal requirement for the preparation of the supporting natural teeth. However, in some cases, a slight depression may need to be created on the inner surface of the teeth to enhance the retention of the bridge framework. After necessary tooth preparation, your dentist will make an impression of the prepared teeth, which will be sent to the dental laboratory. Once the prepared Maryland is received back, it is attached to the teeth by using a dental cement.
- The most important advantage is minimal preparation of abutment: conservative preparation.
- Lesser risk of sensitivity and pulp exposure while preparation.
- Margins of the wings are above the gingival (gums) level which helps in easy removal of the plaque and easier maintenance of hygiene.
- No anesthesia is required for the procedure.
- Reduced chair time.
- Economical: Lower costs as compared to traditional bridges, where three crowns are placed to replace one missing tooth.
- Easy and quick to prepare: in comparison to other types of bridges, the process of fabrication of Maryland bridges is simpler and easier.
Maryland bridges possess two aesthetic limitations due to the use of a metallic framework for support and attachment.
- Limited usage: Maryland bridges are only suitable for use in very few clinical situations. Therefore, they are not used very commonly for tooth replacement.
- Metallic appearance: Our original teeth are naturally translucent. They show partially the color of the metal wings attached at their back surfaces, and hence, appear slightly darker than the other original teeth. Thus, an undesirable color mismatch can occur. To overcome this problem, frameworks of Maryland bridges are being prepared by using zirconia or other types of high strength ceramics.
- Longetivity of the bridge is comparatively much smaller than other treatment options.
- Cannot be placed if little space is available as space correction is difficult.
- Poor alignment of teeth is associated with higher risk of failure.
- Compromised aesthetics in posteriors where metal is used for higher strength.
Complications of Maryland bridges:
The most important advantage - tooth-saving - also is the most important drawback of Maryland bridges. Since they are not attached as firmly as traditional dental bridges, they can become loose or even fall out.
These are the most common problems of Maryland bridges:
- Porcelain fracture
- Loss of adjacent tooth structure due to caries
- Framework fracture
- Minor rotation of the abutment
- Periodontitis in abutment and nearby region.
How much does a Maryland bridge cost?
The usual cost of a single unit Maryland bridge (replaces one missing tooth) ranges from:
- USA: $1500 - $2500
- UK: £1000 - $2000
- Canada: $2000 - $2500
- Australia: $1500 - $3000
Frequenlty asked questions
How long does a Maryland bridge last?
The bridge lasts on an average for 5 years if maintained properly.
What is the success rate of the bridge?
The five year survival rate of Maryland bridge is around 80% and ten year survival rate is around 65%.
Can Maryland bridges be removed?
Yes they can be removed if any caries or sensitivity is noticed. This may indicate the underlying decay of the abutment tooth structure.
Can it be recemented?
Yes it can be recemented. If replacement is done after a long period of time, there might be changes in tooth positions like tilting of the abutments in the space of missing tooth. So if your bridge doesn't fill right, visit your dentist as soon as possible.
Can it be attached to a crown?
It can only be attached to the reverse three fourth crown where the inner or lingual or palatal surface is spared. It can also be placed on the teeth with lumineers especially which are placed in the front teeth for aesthetics purposes.
Can I have braces if I have a Maryland bridge?
Braces placement in orthodontic treatment leads to considerable amount of change in teeth positions. If Maryland bridges are present in the mouth during the treatment, they might hamper the teeth movement or may change the direction of forces on the teeth, causing unwanted teeth rotations. Heavy forces may dislodge the bridge.
So it is better to place it once the orthodontic treatment is completed.
Can I go for MRI if I have maryland bridge?
Yes, you can. Usually metals interrupt the magnetic fields in MRIs. But in these bridges, the amount of metal is very small.
My bridge feels loose, what should I do?
The loose bridge might be because of many reasons, for example due to caries, loss of adhesive etc. Visit your dentist to find the underlying cause. If caries are present, they must be treated. If adhesive is washed off, the bridge can be recemented.
My Maryland bridge keeps coming off / falling, what should I do?
If it falls off, just keep it safely with a cotton wrapped around and visit your dentist for oral examination and recementation. Even if the bridge is loose enough with very high mobility, it is better to remove with your hands to prevent accidental swallowing or to prevent complete dislodgement while swallowing or speaking which may cause trauma to the oral tissues.
Can it cause gum recession?
Proper cleaning and brushing does not cause recession and greatly improves the chances of success. The gum recession is directly proportional to the amount of bone loss, poor bone quality leads to gums recession. So it cannot be stated that gum recession is purely due to the bridge, but multiple factors including local (oral health and hygiene) as well assystemic factors (diabetic control, blood pressure, bone health, nutritional deficiency) might be responsible for it.
Need a local dentist?
Even though many dentists offer Maryland bridges, some don't. Some might do this procedure more often, others just every now and then. Finding the right dentist for a treatment is not an easy task.
Not sure which local dentist to choose?
There might be a lot of dentists in your area offering Maryland bridges. If you are not sure which one to choose, call our partner at 1-855-226-0262 and they will be happy to help you make a decision.