Prefabricated zirconia crowns (e.g., NuSmile, Zirkiz, Kinder Krown) vs Other crowns/restorations (stainless steel crowns, pre-veneered SSC, resin composite strip crowns, glass-fiber composite crowns): Recurrent caries (crowns free of recurrent caries)
Recurrent caries did not differ between zirconia crowns and other restorations at 6 months (RR 1.00, 95% CI 0.97 to 1.03; 2 studies; not GRADE-rated).
What each review found
Include earlier review versions| Finding | Effect | Studies | GRADE certainty |
|---|---|---|---|
Prefabricated zirconia crowns (e.g., NuSmile, Zirkiz, Kinder Krown) vs Other crowns/restorations (stainless steel crowns, pre-veneered SSC, resin composite strip crowns, glass-fiber composite crowns) Recurrent caries (crowns free of recurrent caries) · Children with primary (deciduous) teeth requiring full-coverage crown restoration · 6 months, Pediatric dental clinical settings Recurrent caries did not differ between zirconia crowns and other restorations at 6 months (RR 1.00, 95% CI 0.97 to 1.03; 2 studies; not GRADE-rated). Zirconia Crowns for Primary Teeth: A Systematic Review and Meta-Analyses. (2022) All outcomes | RR 1.00 [0.97, 1.03] | 2 studies · 205 participants | GRADE not reported |
Prefabricated zirconia crowns (e.g., NuSmile, Zirkiz, Kinder Krown) vs Other crowns/restorations (stainless steel crowns, pre-veneered SSC, resin composite strip crowns, glass-fiber composite crowns) Recurrent caries (crowns free of recurrent caries) · Children with primary (deciduous) teeth requiring full-coverage crown restoration · 12 months, Pediatric dental clinical settings Recurrent caries did not differ between zirconia crowns and other restorations at 12 months (RR 1.03, 95% CI 0.96 to 1.10; 2 studies; not GRADE-rated). Zirconia Crowns for Primary Teeth: A Systematic Review and Meta-Analyses. (2022) All outcomes | RR 1.03 [0.96, 1.10] | 2 studies · 203 participants | GRADE not reported |
Findings are shown side by side, never pooled across reviews.
The reviews
| Review | Searched up to | Included studies | AMSTAR 2 |
|---|---|---|---|
| Zirconia Crowns for Primary Teeth: A Systematic Review and Meta-Analyses. 2022 All outcomes | Last search run 5 January 2022; no date or language restriction applied in the searches | 61 | Critically Low / Critically Low |
Studies behind the findings
The primary studies the full-text reviews tie to this outcome. Reviews with headline outcomes only do not list them here.
- Comparing zirconia to anterior strip crowns in primary anterior teeth in children: a randomized clinical trial. · 2020 · included by 1 of these review
- Donly et al. 2018 · included by 1 of these review
How reviews are matched to this question
Reviews word the same question differently. Four decision models (TypeSafe's Jev, Liquid AI's d1-ultra, SubQ Snap and Baseten's Elephant) judged each wording of the population, intervention, comparator and outcome against the others; two wordings count as the same when at least three of them agree and none clearly disagrees, and findings count as this question only when all four elements match. Timing, setting and subgroup never split a question: they are shown on each finding.