H0rsted P, Sondergaard H, fhylstiu]) A, El Attar K, Fejcrskov O. A retrospective study of direct pulp capping with Ca(OH)2 compounds. Endod Dent Traumatol 1985; 1: 29-34.Abstract -Direct pulp capping with calcium hydroxide compounds was performed on 510 human teeth. Pulp had been exposed as a result of cavity preparation in 70% of cases, and by removal of carious dentine in 15%. For the remaining 15% of the cases no information on the cause of exposure was available. The teeth were clinically and radiographically controlled 1, 3, 6 and 12 months after treatment and at the stopping date. 245 cases were available for clinical examination. Information on the remaining cases was obtained from the records. Using tlie life table method, the trial time was calculated for each case as the time from date of treatment to the date of failure, the date of last contact or the stopping date. The data were analyzed according to cause of perforation, age of patient and type of tooth. Five-year survival was 82%. No significant difference in survival was observed between non-carious and small carious exposures. Young teeth and molars showed a higher survival rate when the longer observation periods were considered.

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Studies have been made on the abrasion by food of difFerent restorative resins in standard Class 1 cavities in mandibular first molars of schoolchildren. The abrasion was recorded by measuring the increasing height of the exposed cavity walls. It was found that Sevriton Simplified* was abraded more than Adaptic*, that no difference in abrasion between Adaptic and Adaptic without filler could be demonstrated, and that Adaptic was abraded more than an experimental composite containing 30% by weight Aerosil®, an ultra-fine SiOj filler with a grain sixe of the order of 25-50 nm. The results are in accord with the findings in an initial study by one of the present authors, in which the fillings were placed in denture porcelain teeth. It is stressed that the conclusions of the present work are pertinent only to the type of abrasion studied, i,e. chewing of food without the possibility of direct contact between the fillings involved and the coiTesponding antagonists.

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