A Retrospective Review of Outcomes of Dental Treatment Performed for Special Needs Patients under General Anaesthesia: 2-Year Follow-Up

Table 4

Failure rates of different restorative materials by tooth type.

Restorative materials	Failure rate (%)				Overall value	Post hoc
	Primary tooth
	Incisors	Canines		Molars
Amalgam	—	—		—	—
Composite	22	45		19		c
Glass ionomer cement	12.5	25		20
Stainless steel crowns	—	—		3.9	—
	Permanent tooth
	Incisors	Canines	Premolars	Molars
Amalgam	—	—	10	13.8		—
Composite	20.6	23.5	0	15.5		—
Glass ionomer cement	0	33.3	0	0		—
Stainless steel crowns	—	—	—	0	—	—

Post hoc < 0.001, a = primary incisor versus primary canine; b = primary incisor versus primary molar; c = primary canine versus primary molar.