Crown and Bridge

Crown and bridge restoration is also often referred to as continuous crown porcelain teeth. It is to use the teeth on both sides of the missing teeth, grind them down as “bridge piers”, and then put the connected crowns on the bridge piers as support, so that the position of the missing teeth is filled.

The effect of crown and bridge restoration is good. After all, it has natural teeth as support, which has good stability and can restore more chewing force than movable dentures, without the trouble of daily removal and wearing. However, in general, crown and bridge restorations have higher requirements on the abutment teeth, and may need to wear the natural adjacent teeth before and after the process.

 

Crown and bridge feature

• Scope of application: suitable for fixed restoration of tooth defects.
• People of application: Suitable for adolescents and adults with dental problems such as missing teeth, abnormal occlusal function, irregular dentition, and gaps between teeth.
• Shelf life:6 months

 

Crown and bridge instructions for use

 

Under the operation of the dentist, complete the three steps of wearing in the patient’s mouth, trying it on, adjusting the position, biting the jaw, and cementing

 

Crown and bridge maintenance method

 

1. China Dental Lab’s recommendation is: the temperature of the Crown and bridge during transportation and storage is less than or equal to 55℃, and the humidity is less than or equal to 85%.
2. During wearing, users can maintain and maintain good oral hygiene normally.
3. Avoid chewing hard food, so as to avoid uneven force on the prosthesis, resulting in a collapse of the porcelain. Do not use your teeth to pry the bottle cap, which may cause damage to the prosthesis.

 

 

Try on Crown and Bridge prosthetics

Evaluation of the prosthesis on the generation before trying on the Crown and Bridge

 

Before trying on the Crown and Bridge, it is necessary for the physician to check the fit of the crown to the surrogate. Upon examination, the physician can identify possible problems with the crown and bridge in terms of edge adhesion, aesthetics, and occlusion.
In general, common problems can include: too tight adjacent surface contact, the small protrusion on the tissue surface of the casting, too stretched crown edge, insufficient crown edge extension, damage to the generation, etc.

1. The contact of the adjacent surface is too tight

Generally, it is a substitute positioning, caused by inaccuracy or wear of the collar contact point.

Solution: When the crown and bridge is in place, check whether the model is displaced, and determine the contact point that is too tight by clenching the paper, sanding and polishing.

2. There is a small protrusion on the tissue surface of the casting

Generally, it is caused by bubbles during embedding.

Solution: Small round drill to grind.

3. The edges are too stretched

This can be caused by poor stamping quality, poor styling, and excess untrimmed wax or porcelain on the edges of the crown and bridge.

Solution: Trim the crown and bridge axles and polish them, or consider returning the restoration to the mechanic room for rework.

4. The edge is not stretched enough

The reason is that the stamping quality is poor, the generation is not well-trimmed, and the complete line cannot be determined.

Solution: Re-make the stamping die and make the restorations

5. Damaged generation

The reason is that the finish line is damaged because the technician is not careful, or the casting has bubbles that wear out the model when it is in place.

Solution: Carefully examine the cause of the damage to the model, and if the restoration is not in place after removing bubbles or small protrusions and trimming excessively long edges, it should be returned to the workshop for rework.

 

Physicians can gradually determine the cause of crown and bridge failure through the following series of tests:

1. Determine that there is no residual temporary adhesive or gum tissue interference;
2. Check and adjust the contact of the adjacent surface that is too tight, and check the contact area model for damage
3. Check for obvious errors related to the technician’s production, including bubbles, small tumors, generation defects, and edge defects of castings. Bubbles and small tumors of castings can be removed with tools:
4. For overly extended edges, it must be trimmed from the outside of the crown and bridge, but not from the inside of the crown;
5. Where the Crown and Bridge cannot be in place, all imperfections must be gently polished with tools and tried again.

 

 

The evaluation of the in-place crown should be carried out from the four aspects of adjacent contact, aesthetics, edge adhesion and occlusion.

Adjacent contact

The physician uses dental floss to examine the adjacent contact. The appropriate adjacent contact is that the floss can pass but is slightly resistant.
If the contact is slightly tight, the adjacent contact area of the Crown and Bridge can be slightly polished and polished. Care should be taken at this time. Improper operation can easily make the contact area larger and wider.
It is also helpful to check the fit of the jaw by placing a thin piece of occlusal paper between the crowns (in the mouth or on the surrogate) before adjusting. Contact areas are rare, and once they occur, physicians can improve it by adding porcelain and alloy solder to the adjacent surface by sending the crown back to China dental outsourcing.

Untreated prosthetic cuts should not be worn and adhered to the patient’s mouth, as this may cause food clogging.

 

Aesthetically pleasing

Adjust the color and shape of the Crown and Bridge, note here that minor adjustments should be made in order, and porcelain can be added to the metal layer if necessary.
Crowns and bridges that are too light in color can be improved by dyeing and re-sintering.
In addition, the color of the All Ceramic Crown and Dental Veneer can be fine-tuned with resin binders.
Before bonding, patients should be asked to evaluate the prosthesis. If they cannot accept the color or shape of the crown, they are advised to speak out. Physicians should never risk dissatisfaction with the patient to bond, and finally remove the prosthesis and repeat all previous production processes.

 

Edge adhesion

Crown and bridge adhesion ranges from very tight to open along the edge of the tooth, especially at edges that can only be examined with a probe.
It is essential for physicians to follow high clinical standards during operation to prolong the lifespan of the prosthesis. The eventual failure of most crown bridge restorations clinically is closely related to insufficient adhesion at their edges. Incongruent edges can cause water mentin to dissolve more easily in contact with saliva or water in the mouth, leading to poor crown retention, marginal plaque buildup, and secondary caries. Defective subgingival margins can affect gum health through local bacteria.

 

Occlusal

The final step is the occlusion assessment. It is best for the physician to remove the crown and bridge and select a few adjacent teeth to use as a reference for the evaluation after the crown is in place again. At this time, the thin occlusion paper determines the amount that needs to be adjusted.