Amalgam vs Preformed metal crown (PMC): Treatment failure (annual failure rate)
- Population
- Children with carious primary molars treated by pulpotomy (vital pulp therapy)
- Intervention
- Amalgam
- Comparison
- Preformed metal crown (PMC)
- Outcome
- Treatment failure (annual failure rate)
Preformed metal crowns had a low annual failure rate (2.4%) in primary molars after pulpotomy, lower than amalgam in the same trial (single high-risk-of-bias RCT; low quality of evidence; not GRADE-rated).
What each review found
Current versions only| Finding | Effect | Studies | GRADE certainty |
|---|---|---|---|
Amalgam (A) vs Preformed metal crown (PMC) Treatment failure (annual failure rate) · Children with carious primary molars treated by pulpotomy (vital pulp therapy) · 1 year, University, Turkey (Sonmez and Duruturk 2010), Preformed metal crown (PMC) arm Preformed metal crowns had a low annual failure rate (2.4%) in primary molars after pulpotomy, lower than amalgam in the same trial (single high-risk-of-bias RCT; low quality of evidence; not GRADE-rated). Clinical effectiveness of restorative materials for the restoration of carious lesions in pulp treated… (2022) All outcomes | AFR 2.4 | 1 study · 83 participants | GRADE not reported |
Amalgam (A) vs Preformed metal crown (PMC) Treatment failure (annual failure rate) · Children with carious primary molars treated by pulpotomy (vital pulp therapy) · 1 year, University, Turkey (Sonmez and Duruturk 2010), Amalgam (A) arm Amalgam had the highest annual failure rate (14.3%) among restorations in primary molars after pulpotomy (single high-risk-of-bias RCT; low quality of evidence; not GRADE-rated). Clinical effectiveness of restorative materials for the restoration of carious lesions in pulp treated… (2022) All outcomes | AFR 14.3 | 1 study · 83 participants | GRADE not reported |
Findings are shown side by side, never pooled across reviews.
The reviews
| Review | Searched up to | Included studies | AMSTAR 2 |
|---|---|---|---|
| Clinical effectiveness of restorative materials for the restoration of carious lesions in pulp treated primary teeth: a systematic review. 2022 All outcomes | December 28, 2020 | 5 | Low / 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.
- Success rate of calcium hydroxide pulpotomy in primary molars restored with amalgam and stainless steel crowns · 2010 · 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.