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Endodontics
Pulp Capping

Pulp capping is an operative technique designed to preserve the vitality of a potentially infected pulp. There are two broad types of pulp capping - the direct and the indirect pulp caps. They are only successful if the pulpal infection is very mild

We have put this topic into the endo section as, if you take the biological viewpoint for endodontology (study of the pulp in health and disease), we believe it belongs here more than in the "restorations" section.

Direct Pulp Cap

The exposed pulp is directly covered. This works best when the exposure is not infected - for example a traumatic exposure caused by slipping with the drill. 

If the pulp becomes exposed while removing soft infected dentine, the chances are that the pulp will be infected also, and a direct pulp cap will fail (that is, an irreversible pulpitis will develop).

Although Calcium Hydoxide has been proven successful for many years, MTA (Mineral Trioxide Aggregate) is fast becoming the material of choice for direct pulp caps. MTA is however very expensive.

Indirect Pulp Cap

The pulp is not exposed - a layer of infected dentine is deliberately left, rather than expose the pulp.

Indirect pulp caps, when done correctly, are more succesful at maintaining long-term vitality than direct ones.

It is not currently (2010) known whether it is necessary to "go in again" after a couple of months for further caries removal.

Procedure for "stepwise" indirect pulp cap

LR7 (47) Pre-op Radiograph. Advanced mesial (smooth surface) caries is present, and there is also a shadow that suggests occlusal (fissure) caries. This tooth was sensitive to cold stimuli, but did not hurt spontaneously.

A radiograph like this suggests that there is a high risk of pulpal exposure during preparation.

What precaution should be taken?
 

What does "aseptic" mean?
 
Remove caries until close to pulp, but not exposed. The radiograph is some help here, as it gives an idea of where the pulp horn is in relation to the caries.

How accurate is the radiograph in showing the extent of these features?
 

Place Calcium Hydroxide lining

Why?
 



Could you use MTA instead of calcium hydroxide?
 

The lining is then covered with a tough temporary restoration, like glass ionomer or resin modified glass ionomer.

Note: It is not currently clear whether it is necessary to "go back in". Returning for more caries removal is called the Stepwise Technique, as the caries is removed in two steps separated by a couple of months.

LEAVE AT LEAST TWO MONTHS Softened dentine may remineralise if gross infection is removed and the cavity can be sealed
Next visit, at least 2 or 3 months later, remove the dressing.

Why 2 or 3 months? Why not wait much longer?
 

Final excavation performed.  If hard dentine has formed, remove the last layer of caries.

What should you do if you expose the pulp while removing soft caries?
 

Place a new lining

This will stimulate further tertiary dentine formation.
Place a RMGI base over it.

What is the advantage of glass ionomer here?
 
Restore the tooth.

What monitoring would you undertake in the years to come?
 


Procedure for Direct Pulp Cap

LRE pre-op radiograph
Exposed pulp. Can you see where?
Continue caries removal.
Place Calcium Hydroxide - direct pulp cap
Place RMGI lining
Etch
Check frosted appearance after etch

Restore.

Follow up regularly to ensure vitality maintained. RCT (probably pulpotomy for a deciduous tooth) or extract if not.

The key factor in pulpal healing after exposure is absence of infection ~ Calcium Hydroxide is antibacterial.

Failure is due to remaining bacteria or exposure to new bacteria from leakage



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