A randomised controlled trial of three aesthetic full-coronal restorations in primary maxillary teeth

Authors:

ABSTRACT

Aim

This randomised clinical trial (RCT) compared the clinical outcomes of three aesthetic full-coronal restorations
(composite strip crowns, pre-veneered stainless steel crowns (SSCs) and pre-fabricated primary zirconia crowns) in carious and
traumatised primary maxillary incisors.

Methods

One hundred and twenty nine teeth in 39 children aged between
3 to 5 years were included. Children were randomly assigned to one of three treatment groups using a permuted block randomisation
technique with a total of 43 teeth in each group. After trainee calibration, restorations were placed and evaluated after 6 months.
Outcomes evaluated were restoration failure, tooth wear of opposing teeth and gingival health.

Results

The retention rate was
highest for zirconia crowns (100) followed by pre-veneered SSCs (95). Strip crowns were the least retentive
(78). Zirconia crowns showed low grade abrasion in four opposing teeth. Teeth restored with resin composite and pre-veneered
SSC showed an increase in mean gingival index score, while corresponding values decreased in zirconia crowns.

Conclusion

Resin composite strip crown is a highly sensitive technique leading to lower retention rate. Pre-veneered stainless steel crowns showed
increased incidence of facial veneer fracture. Zirconia crowns are highly retentive and biocompatible but cause low grade of abrasion of
their opposing natural dentition at the 6-month follow-up.

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