Comprehensive dental treatment of healthy and chronically sick children under intubation general anaesthesia during a 5-year period.

Objective: To quantify the number of extractions and/or restorations placed in chronically sick children under intubation general anaesthesia and compare these findings with healthy children.

Setting: Two large paediatric dentistry units in Central London: a tertiary referral centre dealing with severe chronic sickness in children and an undergraduate dental school with a large commitment to special needs dentistry in children.

Design: Prospective comparison of treatment received for (a) chronically sick children and (b) dentally anxious (otherwise fit) children receiving intubation general anaesthesia during July 1991 to June 1996 inclusive.

The effect of restorative materials on the wear of human enamel.

The wear of human dental enamel against amalgam, Concise composite, SR-Isosit Inlay/Onlay composite, Vitadur-N glazed porcelain, unglazed IPS Empress ceramic, and enamel (control) was investigated by use of a modified stress cycling machine. Testing was carried out in water and in citric acid (pH 4) and the enamel-material couples were subjected to 25,000 cycles of wear with a maximum load of 40 N. Tooth profile reduction was measured at baseline and at 5000 cyclic intervals with a computer image analysis program.