The Hall Technique 10 years on: Questions and answers.

It is ten years since the first paper on the Hall Technique was published in the British Dental Journal and almost 20 years since the technique first came to notice. Dr Norna Hall a (now retired) general dental practitioner from the north of Scotland had, for many years, been managing carious primary molar teeth by cementing preformed metal crowns over them, with no local anaesthesia, tooth preparation or carious tissue removal. This first report, a retrospective analysis of Dr Hall's treatments, caused controversy. How could simply sealing a carious lesion, with all the associated bacteria and decayed tissues, possibly be clinically successful? Since then, growing understanding that caries is essentially a biofilm driven disease rather than an infectious disease, explains why the Hall Technique, and other 'sealing in' carious lesion techniques, are successful. The intervening ten years has seen robust evidence from several randomised control trials that are either completed or underway. These have found the Hall Technique superior to comparator treatments, with success rates (no pain or infection) of 99% (UK study) and 100% (Germany) at one year, 98% and 93% over two years (UK and Germany) and 97% over five years (UK). The Hall Technique is now regarded as one of several biological management options for carious lesions in primary molars. This paper covers commonly asked questions about the Hall Technique and speculates on what lies ahead.

Caries experience and oral health behaviour among 11 -13-year-olds: an ecological study of data from 27 European countries, Israel, Canada and USA.

OBJECTIVE: This study is a part of the cross-national survey on health behaviour in school-aged children (HBSC) - World Health Organization Collaborative Study. The aim was to compare the HBSC data on frequency of toothbrushing, consumption of sweets, soft drinks, fruits and vegetables among 11-13-year-old children in different countries and to estimate the relation of these factors with caries experience at the country level. METHODS: Oral health behaviour patterns were assessed from the HBSC survey conducted in the 2001-2002 school year in 27 countries in Europe, Israel, Canada, and the USA. PARTICIPANTS: Representative samples of 11- and 13-year-old schoolchildren were drawn from participating countries and aggregated by the direct age standardisation method. DMFT of 12-year-olds was collected from the international data banks and recent publications. Statistical analysis was performed using multiple linear regression. RESULTS: The most significant factor related with the cross-regional variation of DMFT was the proportion of children who reported regular toothbrushing; it explained 26.3% of the DMFT variation. Low rates of regular toothbrushing and high rates of sweets consumption were related with higher DMFT while high rates of drinking of soft drinks were related with lower DMFT. Consumption of fruits and vegetables had no significant impact. Altogether, factors of this model explained 51.2% of the total DMFT variation across countries. CONCLUSION: The findings of the study demonstrate that different oral health behaviour profiles among young people across European countries, Israel, Canada, and the USA significantly contribute to the variation in caries experience.