The Failure Rate of Different Types of Full Coronal Restoration Crowns in Primary Teeth

Background: The aims of this study was comparing different genders and different types of full coronal restorations, including stainless steel crowns, adhesive resin-based composite crowns and zirconia crowns; then analyzing the failure rate and the timing of the failure occuring.

Methods: 151 children ( 77 males and 74 females) from 2 to 6 years old receiving full mouth caries management under general anesthesia were analyzed. All children were without any major systemic disease. The teeth with multiple-surfaced caries or needed to perform pulp treatment were restored with full coronal restoration. Stainless steel crowns (3M™ ESPE™ Stainless Steel Primary Molar Crowns) or zirconia crowns (NuSmile ZR ZIrconia Crowns) were selected to restore the posterior primary teeth; adhesive resin-based composite crowns (3M™ ESPE™ Paediatric Strip Crowns) or zirconia crowns (NuSmile ZR ZIrconia Crowns) were used in anterior primary teeth. The definition of the failure was the crowns or teeth lost and damaged.

Results: In these children, 454 posterior teeth restored with SSCs, 286 anterior teeth restored with Strip Crowns, 52 anterior teeth and 30 posterior teeth restored with Nu-smile zirconia crowns. The failure rate of SSCs was 0.66 %; Strip Crowns was 8.74 %; Nu-smile zirconia crowns in anterior dentition was 3.85 %; Nu-smile zirconia crowns in posterior teeth was 3.33 %. In cases of failure, 19 (24.68 %) males and 5 (6.76 %) females were included. The failure of the full coronal restorations occurred after 0.5 to 26 months of the treatment.

Conclusions: About the full coronal restoration over posterior teeth, SSCs had the less failure rate than Nu-smile zirconia crowns. However, Strip Crowns had highest failure rate; Nu-smile zirconia crowns may be the better choice for full coronal restoration of anterior teeth. After the treatment, male patients met dislodged or damaged crowns more often than female.