with bacterial invasion of the tooth pulp leading to a periapical abscess is the most common cause of dentocutaneous sinus tracts.
Clinical and radiographic evaluation of partial pulpotomy in carious exposure of permanent molars.
Conclusions: MTA has clinical success rate comparable to CH as a pulp dressing material for partial pulpotomy in permanent molars with carious exposures.
In a study on young posterior teeth, Mejare and Cvek  suggested that deep carious exposures be opened up so that 1 to 3 mm of exposed pulp can be removed and the pulp can be covered with CH.
Oral hygiene instruction and preventive advice were given; 16, 17, 22, 26, 27 and 35, 46 and 47 were restored; 37 had a large carious exposure.
2000] reported a success rate of 37% at 5 years and only 13% at 10 years following direct pulp capping of carious exposures less than 1 mm in diameter.
Hard-setting CaOH was the most popular direct pulp cap medicament, and 1 respondent commented that CaOH was taught specifically only for traumatic exposures and never for carious exposures