How it works and clinical effectiveness It provides full coronal coverage and the risk of future carious lesion development on another surface of the tooth is avoided.67 The HT is technically simple to carry out and is well accepted by children, their parents and dentists.68,69 It has a strong evidence base showing high long-term success rates in randomised control trials (>90%) compared to conventional restorations (50-80%) and comparable to conventional crowns.68,69,70 The high rate of success, its durability and cost-effectiveness have meant use of the HT has increased, with a recent survey including 709 paediatric dentists from six continents showed that 92% had heard about it and 51% were using it.71