The Hall Technique; a randomized controlled clinical trial of a novel method of managing carious primary molars in general dental practice: acceptability of the technique and outcomes at 23 months

Table 13 Categories of 'Minor' failures for Control restorations and Hall PMCs. Minimum patient follow-up 23 months; range of restoration failures 0–36 months.

	Control restoration		Hall PMC
	Criteria	Number of teeth	Criteria	Number of teeth
Clinical and radiographic 'Minor' failure	Filling lost; tooth restorable	26	PMC lost; tooth restorable	1
	Secondary caries or new caries	23	Secondary caries or new caries	1*
	Filling worn	5	Hall PMC worn through	1
			Impacted first permanent molar	1
Radiographic 'Minor' failure alone	caries progression visible on radiographs	3	caries progression visible on radiographs	2**
Total		57		6

*crown not fitted, secondary caries around restoration (followed up under Intention to treat)
** both crowns recorded as being radiographically poor fit