Non-Cochrane · intervention · PM41458471

Which is the best adhesive system for primary tooth enamel? A systematic review and network meta-analysis of bond strength data.

Oliveira Francisca Jennifer Duarte de, Silva Flor Maria Larissa da, de Bessa Mariana Silva, et al. · The Japanese dental science review · 2026 · PubMed · doi:10.1016/j.jdsr.2025.11.005

Findings

52 findings

Population
Primary (deciduous) tooth enamelone-step self-etch adhesive without phosphoric acid etching (1_Step_SE_noPAE)three-step etch-and-rinse adhesive (3_Step_ER)Bond strength to primary tooth enamel (shear, microshear or microtensile; MPa)
24 h · In vitro (laboratory) · Network estimate (all evidence)
MD -20.28 [-29.04, -10.98]
GRADE not reported
Studies not reported
Primary (deciduous) tooth enamelone-bottle universal adhesive without phosphoric acid etching (1b_Univ_noPAE)three-step etch-and-rinse adhesive (3_Step_ER)Bond strength to primary tooth enamel (shear, microshear or microtensile; MPa)
24 h · In vitro (laboratory) · Node-splitting: network estimate
MD -19.3 [-30.5, -7.7]
GRADE not reported
Studies not reported
Primary (deciduous) tooth enamelone-bottle universal adhesive without phosphoric acid etching (1b_Univ_noPAE)three-step etch-and-rinse adhesive (3_Step_ER)Bond strength to primary tooth enamel (shear, microshear or microtensile; MPa)
24 h · In vitro (laboratory) · Node-splitting: indirect evidence
MD -25.6 [-40.5, -11.4]
GRADE not reported
Studies not reported
Primary (deciduous) tooth enamelone-bottle universal adhesive without phosphoric acid etching (1b_Univ_noPAE)three-step etch-and-rinse adhesive (3_Step_ER)Bond strength to primary tooth enamel (shear, microshear or microtensile; MPa)
24 h · In vitro (laboratory) · Node-splitting: direct evidence
MD -9.31 [-27.5, 8.32]
GRADE not reported
Studies not reported
Primary (deciduous) tooth enamelone-bottle universal adhesive without phosphoric acid etching (1b_Univ_noPAE)three-step etch-and-rinse adhesive (3_Step_ER)Bond strength to primary tooth enamel (shear, microshear or microtensile; MPa)
24 h · In vitro (laboratory) · Network estimate (all evidence)
MD -19.36 [-30.41, -7.65]
GRADE not reported
Studies not reported
Primary (deciduous) tooth enamelone-bottle universal adhesive with phosphoric acid etching (1b_Univ_PAE)three-step etch-and-rinse adhesive (3_Step_ER)Bond strength to primary tooth enamel (shear, microshear or microtensile; MPa)
24 h · In vitro (laboratory) · Network estimate (all evidence)
MD -13.53 [-25.5, -0.86]
GRADE not reported
Studies not reported
Primary (deciduous) tooth enameltwo-step etch-and-rinse adhesive (2_Step_ER)three-step etch-and-rinse adhesive (3_Step_ER)Bond strength to primary tooth enamel (shear, microshear or microtensile; MPa)
24 h · In vitro (laboratory) · Node-splitting: direct evidence
MD -20.7 [-33, -8.52]
GRADE not reported
Studies not reported
Primary (deciduous) tooth enameltwo-step etch-and-rinse adhesive (2_Step_ER)three-step etch-and-rinse adhesive (3_Step_ER)Bond strength to primary tooth enamel (shear, microshear or microtensile; MPa)
24 h · In vitro (laboratory) · Node-splitting: network estimate
MD -15.3 [-24.2, -5.83]
GRADE not reported
Studies not reported
Primary (deciduous) tooth enameltwo-step etch-and-rinse adhesive (2_Step_ER)three-step etch-and-rinse adhesive (3_Step_ER)Bond strength to primary tooth enamel (shear, microshear or microtensile; MPa)
24 h · In vitro (laboratory) · Node-splitting: indirect evidence
MD -3.02 [-18.7, 12.7]
GRADE not reported
Studies not reported
Primary (deciduous) tooth enameltwo-step etch-and-rinse adhesive (2_Step_ER)three-step etch-and-rinse adhesive (3_Step_ER)Bond strength to primary tooth enamel (shear, microshear or microtensile; MPa)
24 h · In vitro (laboratory) · Network estimate (all evidence)
MD -15.25 [-24.12, -5.79]
GRADE not reported
Studies not reported
Primary (deciduous) tooth enameltwo-step self-etch adhesive without phosphoric acid etching (2_Step_SE_noPAE)three-step etch-and-rinse adhesive (3_Step_ER)Bond strength to primary tooth enamel (shear, microshear or microtensile; MPa)
24 h · In vitro (laboratory) · Node-splitting: direct evidence
MD -6.07 [-21.7, 10]
GRADE not reported
Studies not reported
Primary (deciduous) tooth enameltwo-step self-etch adhesive without phosphoric acid etching (2_Step_SE_noPAE)three-step etch-and-rinse adhesive (3_Step_ER)Bond strength to primary tooth enamel (shear, microshear or microtensile; MPa)
24 h · In vitro (laboratory) · Node-splitting: network estimate
MD -17.7 [-26.9, -8.31]
GRADE not reported
Studies not reported
Primary (deciduous) tooth enameltwo-step self-etch adhesive without phosphoric acid etching (2_Step_SE_noPAE)three-step etch-and-rinse adhesive (3_Step_ER)Bond strength to primary tooth enamel (shear, microshear or microtensile; MPa)
24 h · In vitro (laboratory) · Network estimate (all evidence)
MD -17.73 [-26.96, -8.25]
GRADE not reported
Studies not reported
Primary (deciduous) tooth enameltwo-step self-etch adhesive without phosphoric acid etching (2_Step_SE_noPAE)three-step etch-and-rinse adhesive (3_Step_ER)Bond strength to primary tooth enamel (shear, microshear or microtensile; MPa)
24 h · In vitro (laboratory) · Node-splitting: indirect evidence
MD -23.9 [-35.5, -12.7]
GRADE not reported
Studies not reported
Primary (deciduous) tooth enameltwo-bottle universal adhesive without phosphoric acid etching (2b_Univ_noPAE)three-step etch-and-rinse adhesive (3_Step_ER)Bond strength to primary tooth enamel (shear, microshear or microtensile; MPa)
24 h · In vitro (laboratory) · Network estimate (all evidence)
MD -16.77 [-30.56, -2.44]
GRADE not reported
Studies not reported
Primary (deciduous) tooth enameltwo-bottle universal adhesive with phosphoric acid etching (2b_Univ_PAE)three-step etch-and-rinse adhesive (3_Step_ER)Bond strength to primary tooth enamel (shear, microshear or microtensile; MPa)
24 h · In vitro (laboratory) · Network estimate (all evidence)
MD -6.37 [-20.83, 8.65]
GRADE not reported
Studies not reported
Primary (deciduous) tooth enamelone-step self-etch adhesive without phosphoric acid etching (1_Step_SE_noPAE)one-bottle universal adhesive without phosphoric acid etching (1b_Univ_noPAE)Bond strength to primary tooth enamel (shear, microshear or microtensile; MPa)
24 h · In vitro (laboratory) · Node-splitting: network estimate
MD -0.98 [-9.69, 7.76]
GRADE not reported
Studies not reported
Primary (deciduous) tooth enamelone-step self-etch adhesive without phosphoric acid etching (1_Step_SE_noPAE)one-bottle universal adhesive without phosphoric acid etching (1b_Univ_noPAE)Bond strength to primary tooth enamel (shear, microshear or microtensile; MPa)
24 h · In vitro (laboratory) · Network estimate (all evidence)
MD -0.95 [-9.62, 7.75]
GRADE not reported
Studies not reported
Primary (deciduous) tooth enamelone-step self-etch adhesive without phosphoric acid etching (1_Step_SE_noPAE)one-bottle universal adhesive without phosphoric acid etching (1b_Univ_noPAE)Bond strength to primary tooth enamel (shear, microshear or microtensile; MPa)
24 h · In vitro (laboratory) · Node-splitting: indirect evidence
MD -1.01 [-12.5, 10.4]
GRADE not reported
Studies not reported
Primary (deciduous) tooth enamelone-step self-etch adhesive without phosphoric acid etching (1_Step_SE_noPAE)one-bottle universal adhesive without phosphoric acid etching (1b_Univ_noPAE)Bond strength to primary tooth enamel (shear, microshear or microtensile; MPa)
24 h · In vitro (laboratory) · Node-splitting: direct evidence
MD 2.33 [-17.3, 21.8]
GRADE not reported
Studies not reported
Primary (deciduous) tooth enamelone-step self-etch adhesive without phosphoric acid etching (1_Step_SE_noPAE)one-bottle universal adhesive with phosphoric acid etching (1b_Univ_PAE)Bond strength to primary tooth enamel (shear, microshear or microtensile; MPa)
24 h · In vitro (laboratory) · Network estimate (all evidence)
MD -6.78 [-16.61, 3.1]
GRADE not reported
Studies not reported
Primary (deciduous) tooth enamelone-bottle universal adhesive without phosphoric acid etching (1b_Univ_noPAE)one-bottle universal adhesive with phosphoric acid etching (1b_Univ_PAE)Bond strength to primary tooth enamel (shear, microshear or microtensile; MPa)
24 h · In vitro (laboratory) · Network estimate (all evidence)
MD -5.83 [-12.61, 0.98]
GRADE not reported
Studies not reported
Primary (deciduous) tooth enamelone-step self-etch adhesive without phosphoric acid etching (1_Step_SE_noPAE)two-step etch-and-rinse adhesive (2_Step_ER)Bond strength to primary tooth enamel (shear, microshear or microtensile; MPa)
24 h · In vitro (laboratory) · Node-splitting: network estimate
MD -4.99 [-9.28, -0.958]
GRADE not reported
Studies not reported
Primary (deciduous) tooth enamelone-step self-etch adhesive without phosphoric acid etching (1_Step_SE_noPAE)two-step etch-and-rinse adhesive (2_Step_ER)Bond strength to primary tooth enamel (shear, microshear or microtensile; MPa)
24 h · In vitro (laboratory) · Node-splitting: indirect evidence
MD -0.136 [-20.9, 20]
GRADE not reported
Studies not reported
Primary (deciduous) tooth enamelone-step self-etch adhesive without phosphoric acid etching (1_Step_SE_noPAE)two-step etch-and-rinse adhesive (2_Step_ER)Bond strength to primary tooth enamel (shear, microshear or microtensile; MPa)
24 h · In vitro (laboratory) · Node-splitting: direct evidence
MD -5.54 [-10.5, -0.99]
GRADE not reported
Studies not reported
Primary (deciduous) tooth enamelone-step self-etch adhesive without phosphoric acid etching (1_Step_SE_noPAE)two-step etch-and-rinse adhesive (2_Step_ER)Bond strength to primary tooth enamel (shear, microshear or microtensile; MPa)
24 h · In vitro (laboratory) · Network estimate (all evidence)
MD -5.01 [-9.3, -0.97]
GRADE not reported
Studies not reported
Primary (deciduous) tooth enamelone-bottle universal adhesive without phosphoric acid etching (1b_Univ_noPAE)two-step etch-and-rinse adhesive (2_Step_ER)Bond strength to primary tooth enamel (shear, microshear or microtensile; MPa)
24 h · In vitro (laboratory) · Network estimate (all evidence)
MD -4.05 [-12.89, 4.53]
GRADE not reported
Studies not reported
Primary (deciduous) tooth enamelone-bottle universal adhesive with phosphoric acid etching (1b_Univ_PAE)two-step etch-and-rinse adhesive (2_Step_ER)Bond strength to primary tooth enamel (shear, microshear or microtensile; MPa)
24 h · In vitro (laboratory) · Network estimate (all evidence)
MD 1.75 [-8.19, 11.6]
GRADE not reported
Studies not reported
Primary (deciduous) tooth enamelone-step self-etch adhesive without phosphoric acid etching (1_Step_SE_noPAE)two-step self-etch adhesive without phosphoric acid etching (2_Step_SE_noPAE)Bond strength to primary tooth enamel (shear, microshear or microtensile; MPa)
24 h · In vitro (laboratory) · Node-splitting: network estimate
MD -2.54 [-7.57, 2.54]
GRADE not reported
Studies not reported
Primary (deciduous) tooth enamelone-step self-etch adhesive without phosphoric acid etching (1_Step_SE_noPAE)two-step self-etch adhesive without phosphoric acid etching (2_Step_SE_noPAE)Bond strength to primary tooth enamel (shear, microshear or microtensile; MPa)
24 h · In vitro (laboratory) · Node-splitting: direct evidence
MD -1.29 [-8.02, 5.72]
GRADE not reported
Studies not reported
Primary (deciduous) tooth enamelone-step self-etch adhesive without phosphoric acid etching (1_Step_SE_noPAE)two-step self-etch adhesive without phosphoric acid etching (2_Step_SE_noPAE)Bond strength to primary tooth enamel (shear, microshear or microtensile; MPa)
24 h · In vitro (laboratory) · Node-splitting: indirect evidence
MD -7.14 [-19.8, 4.13]
GRADE not reported
Studies not reported
Primary (deciduous) tooth enamelone-step self-etch adhesive without phosphoric acid etching (1_Step_SE_noPAE)two-step self-etch adhesive without phosphoric acid etching (2_Step_SE_noPAE)Bond strength to primary tooth enamel (shear, microshear or microtensile; MPa)
24 h · In vitro (laboratory) · Network estimate (all evidence)
MD -2.55 [-7.51, 2.59]
GRADE not reported
Studies not reported
Primary (deciduous) tooth enamelone-bottle universal adhesive without phosphoric acid etching (1b_Univ_noPAE)two-step self-etch adhesive without phosphoric acid etching (2_Step_SE_noPAE)Bond strength to primary tooth enamel (shear, microshear or microtensile; MPa)
24 h · In vitro (laboratory) · Network estimate (all evidence)
MD -1.58 [-8.97, 5.87]
GRADE not reported
Studies not reported
Primary (deciduous) tooth enamelone-bottle universal adhesive with phosphoric acid etching (1b_Univ_PAE)two-step self-etch adhesive without phosphoric acid etching (2_Step_SE_noPAE)Bond strength to primary tooth enamel (shear, microshear or microtensile; MPa)
24 h · In vitro (laboratory) · Network estimate (all evidence)
MD 4.24 [-4.44, 13.02]
GRADE not reported
Studies not reported
Primary (deciduous) tooth enameltwo-step etch-and-rinse adhesive (2_Step_ER)two-step self-etch adhesive without phosphoric acid etching (2_Step_SE_noPAE)Bond strength to primary tooth enamel (shear, microshear or microtensile; MPa)
24 h · In vitro (laboratory) · Node-splitting: direct evidence
MD 3.81 [-2.38, 10.7]
GRADE not reported
Studies not reported
Primary (deciduous) tooth enameltwo-step etch-and-rinse adhesive (2_Step_ER)two-step self-etch adhesive without phosphoric acid etching (2_Step_SE_noPAE)Bond strength to primary tooth enamel (shear, microshear or microtensile; MPa)
24 h · In vitro (laboratory) · Node-splitting: network estimate
MD 2.45 [-2.32, 7.54]
GRADE not reported
Studies not reported
Primary (deciduous) tooth enameltwo-step etch-and-rinse adhesive (2_Step_ER)two-step self-etch adhesive without phosphoric acid etching (2_Step_SE_noPAE)Bond strength to primary tooth enamel (shear, microshear or microtensile; MPa)
24 h · In vitro (laboratory) · Network estimate (all evidence)
MD 2.49 [-2.3, 7.61]
GRADE not reported
Studies not reported
Primary (deciduous) tooth enameltwo-step etch-and-rinse adhesive (2_Step_ER)two-step self-etch adhesive without phosphoric acid etching (2_Step_SE_noPAE)Bond strength to primary tooth enamel (shear, microshear or microtensile; MPa)
24 h · In vitro (laboratory) · Node-splitting: indirect evidence
MD -4.53 [-19.7, 11.4]
GRADE not reported
Studies not reported
Primary (deciduous) tooth enamelone-step self-etch adhesive without phosphoric acid etching (1_Step_SE_noPAE)two-bottle universal adhesive without phosphoric acid etching (2b_Univ_noPAE)Bond strength to primary tooth enamel (shear, microshear or microtensile; MPa)
24 h · In vitro (laboratory) · Network estimate (all evidence)
MD -3.51 [-16.12, 8.93]
GRADE not reported
Studies not reported
Primary (deciduous) tooth enamelone-bottle universal adhesive without phosphoric acid etching (1b_Univ_noPAE)two-bottle universal adhesive without phosphoric acid etching (2b_Univ_noPAE)Bond strength to primary tooth enamel (shear, microshear or microtensile; MPa)
24 h · In vitro (laboratory) · Network estimate (all evidence)
MD -2.59 [-15.7, 10.59]
GRADE not reported
Studies not reported
Primary (deciduous) tooth enamelone-bottle universal adhesive with phosphoric acid etching (1b_Univ_PAE)two-bottle universal adhesive without phosphoric acid etching (2b_Univ_noPAE)Bond strength to primary tooth enamel (shear, microshear or microtensile; MPa)
24 h · In vitro (laboratory) · Network estimate (all evidence)
MD 3.24 [-10.84, 17.32]
GRADE not reported
Studies not reported
Primary (deciduous) tooth enameltwo-step etch-and-rinse adhesive (2_Step_ER)two-bottle universal adhesive without phosphoric acid etching (2b_Univ_noPAE)Bond strength to primary tooth enamel (shear, microshear or microtensile; MPa)
24 h · In vitro (laboratory) · Network estimate (all evidence)
MD 1.53 [-10.99, 14.12]
GRADE not reported
Studies not reported
Primary (deciduous) tooth enameltwo-step self-etch adhesive without phosphoric acid etching (2_Step_SE_noPAE)two-bottle universal adhesive without phosphoric acid etching (2b_Univ_noPAE)Bond strength to primary tooth enamel (shear, microshear or microtensile; MPa)
24 h · In vitro (laboratory) · Network estimate (all evidence)
MD -0.98 [-13.03, 11.05]
GRADE not reported
Studies not reported
Primary (deciduous) tooth enamelone-step self-etch adhesive without phosphoric acid etching (1_Step_SE_noPAE)two-bottle universal adhesive with phosphoric acid etching (2b_Univ_PAE)Bond strength to primary tooth enamel (shear, microshear or microtensile; MPa)
24 h · In vitro (laboratory) · Network estimate (all evidence)
MD -13.94 [-27.27, -0.7]
GRADE not reported
Studies not reported
Primary (deciduous) tooth enamelone-bottle universal adhesive without phosphoric acid etching (1b_Univ_noPAE)two-bottle universal adhesive with phosphoric acid etching (2b_Univ_PAE)Bond strength to primary tooth enamel (shear, microshear or microtensile; MPa)
24 h · In vitro (laboratory) · Network estimate (all evidence)
MD -12.97 [-26.97, 0.85]
GRADE not reported
Studies not reported
Primary (deciduous) tooth enamelone-bottle universal adhesive with phosphoric acid etching (1b_Univ_PAE)two-bottle universal adhesive with phosphoric acid etching (2b_Univ_PAE)Bond strength to primary tooth enamel (shear, microshear or microtensile; MPa)
24 h · In vitro (laboratory) · Network estimate (all evidence)
MD -7.15 [-22.11, 7.54]
GRADE not reported
Studies not reported
Primary (deciduous) tooth enameltwo-step etch-and-rinse adhesive (2_Step_ER)two-bottle universal adhesive with phosphoric acid etching (2b_Univ_PAE)Bond strength to primary tooth enamel (shear, microshear or microtensile; MPa)
24 h · In vitro (laboratory) · Network estimate (all evidence)
MD -8.91 [-22.34, 4.52]
GRADE not reported
Studies not reported
Primary (deciduous) tooth enameltwo-step self-etch adhesive without phosphoric acid etching (2_Step_SE_noPAE)two-bottle universal adhesive with phosphoric acid etching (2b_Univ_PAE)Bond strength to primary tooth enamel (shear, microshear or microtensile; MPa)
24 h · In vitro (laboratory) · Network estimate (all evidence)
MD -11.4 [-24.37, 1.49]
GRADE not reported
Studies not reported
Primary (deciduous) tooth enameltwo-bottle universal adhesive without phosphoric acid etching (2b_Univ_noPAE)two-bottle universal adhesive with phosphoric acid etching (2b_Univ_PAE)Bond strength to primary tooth enamel (shear, microshear or microtensile; MPa)
24 h · In vitro (laboratory) · Network estimate (all evidence)
MD -10.4 [-25.77, 4.78]
GRADE not reported
Studies not reported
Primary tooth enamel (extracted human deciduous teeth)2_Step_SE_noPAE1b_Univ_PAEBond strength (MPa), shear, microshear or microtensile
24 h · In vitro laboratory · Node-split indirect estimate
MD -4.53 [-22.0, 12.9]
GRADE not reported
Studies not reported
Primary tooth enamel (extracted human deciduous teeth)2_Step_SE_noPAE1b_Univ_PAEBond strength (MPa), shear, microshear or microtensile
24 h · In vitro laboratory · Node-split direct estimate
MD -4.42 [-16.7, 7.79]
GRADE not reported
Studies not reported
Primary tooth enamel (extracted human deciduous teeth)2_Step_SE_noPAE1b_Univ_PAEBond strength (MPa), shear, microshear or microtensile
24 h · In vitro laboratory · Node-split network estimate
MD -4.17 [-13.0, 4.41]
GRADE not reported
Studies not reported

Included primary studies 15

Open in Studies
StudyYearAlso included byOutcomes it informs hereTrial data
Agostini 2001
Bond strength of self-etching primers to enamel and dentin of primary teeth.
PMID:11800447
2001this review onlynot statednot extracted yet
Antoniazzi 2016
Selective Acid Etching Improves the Bond Strength of Universal Adhesive to Sound and Demineralized Enamel of Primary Teeth.
PMID:27419240
2016this review onlynot statednot extracted yet
Firoozmand 2015
Effect of Fluoride and Simplified Adhesive Systems on the Bond Strength of Primary Molars and Incisors.
PMID:26312974
2015this review onlynot statednot extracted yet
Kensche 2015
Shear bond strength of different types of adhesive systems to dentin and enamel of deciduous teeth in vitro.
PMID:26280753
2016this review onlynot statednot extracted yet
Kim 2021
Shear Bond Strength of Different MDP-Containing Adhesive Systems on Enamel and Dentin from Primary Teeth.
PMID:34192754
2021this review onlynot statednot extracted yet
Knirsch 2009
Bonding effectiveness of different adhesion approaches to unground versus ground primary tooth enamel.
PMID:19566374
2009this review onlynot statednot extracted yet
Luo 2020
[Effects of three self-etch adhesives and mild salivary contamination on the bonding durability of deciduous teeth].
PMID:33550335
2020this review onlynot statednot extracted yet
Marquezan 2007
Microtensile bond strength of contemporary adhesives to primary enamel and dentin.
PMID:18389678
2008this review onlynot statednot extracted yet
Nozari 2014
Comparison of Shear Bond Strength of Composite Restorations to Intact Enamel of Primary Incisors When Using Different Conditioners and…
DOI:10.18869/acadpub.3dj.3.2.23
2014this review onlynot statednot extracted yet
Nozari 2024
Influence of Different Application Modes of a Universal Adhesive System on the Bond Strength of Bulk‐Fill Composite Resin to Enamel and…
DOI:10.1002/cre2.947
2024this review onlynot statednot extracted yet
Nozari 2024
Influence of Different Application Modes of a Universal Adhesive System on the Bond Strength of Bulk-Fill Composite Resin to Enamel and…
PMID:39205379
2024this review onlynot statednot extracted yet
Ramires-Romito 2007
Microtensile bond strength of sealant and adhesive systems applied to occlusal primary enamel.
PMID:17542206
2007this review onlynot statednot extracted yet
Soares 2020
Microtensile Bond Strength of Three Different Adhesive Systems to Primary Enamel: An In Vitro Study.
PMID:33369560
2020this review onlynot statednot extracted yet
Tichy 2023
The Effect of Bonding Strategy and Aging on Adhesion to Primary Enamel: An In-Vitro Study.
PMID:37843501
2023this review onlynot statednot extracted yet
Xu 2023
Exploration and preliminary clinical investigation of an adhesive approach for primary tooth restoration.
PMID:36894170
2022this review onlynot statednot extracted yet

Review question

ElementPlanned (methods)Found (results)
PopulationPrimary tooth enamelHuman deciduous (primary) tooth enamel, prismatic (n=9 studies) and aprismatic (n=5 studies)
InterventionAny type of dental adhesive35 adhesive systems grouped into 8 strategies: 3_Step_ER, 2_Step_ER, 2_Step_SE_noPAE, 1_Step_SE_noPAE, 2b_Univ_PAE, 1b_Univ_PAE, 2b_Univ_noPAE, 1b_Univ_noPAE
ComparisonDifferent adhesive systems or adhesion strategiesNetwork meta-analysis with 3_Step_ER as reference; all pairs compared
OutcomesBond strength (shear, microshear or microtensile) at 24 hBond strength (MPa), shear (n=11 studies) or microtensile (n=3 studies); mean difference at 24 h
Study designsIn vitro studies; no year or language limitIn vitro studies (n=14 included; n=10 in network meta-analysis)
Timing24 h24 h (studies with thermocycling or aging excluded from quantitative analysis)

AMSTAR 2 items

Two independent extractors rated each item. Their ratings are shown side by side because they have not been reconciled yet. The overall rating follows Shea et al. 2017: one critical flaw gives Low, more than one gives Critically Low.

ItemExtractor AExtractor BAgree
1Research question includes PICO componentsYesYesyes
2Protocol established before the reviewcriticalPartial YesPartial Yesyes
3Choice of study designs explainedNoNoyes
4Comprehensive literature searchcriticalPartial YesPartial Yesyes
5Study selection in duplicateYesYesyes
6Data extraction in duplicateYesYesyes
7List of excluded studies with reasonscriticalNoNoyes
8Included studies described in detailPartial YesYesno
9Risk of bias assessed satisfactorilycriticalRCT: N/A · NRSI: Partial YesNRSI: Partial Yes · RCT: N/Ano
10Funding of included studies reportedNoNoyes
11Appropriate meta-analysis methodscriticalRCT: N/A · NRSI: YesNRSI: Partial Yes · RCT: N/Ano
12Impact of risk of bias on the pooled resultsNoYesno
13Risk of bias accounted for in interpretationcriticalYesYesyes
14Heterogeneity explainedYesYesyes
15Publication bias investigatedcriticalNoNoyes
16Conflicts of interest reportedNoYesno
OverallCritically LowCritically Lowyes