What do systematic reviews say?

Alginate (two stage-two step final/wash impression) vs Silicone elastomer (two stage-two step)

Alginate (two stage-two step final/wash impression) may leads to higher participant-reported oral health-related quality of life… compared with silicone elastomer (two stage-two step) (low certainty).

• Final‐impression techniques and materials for making complete and removable partial dentures 2018 · Cochrane All outcomes

  2 weeks
  MD 7.20 [2.71, 11.69]
  1 study · 144 participants
  Low

Tooth-supported removable partial denture: same impression material, different final-impression technique vs The same material with an alternative final-impression technique

The review found no eligible studies for this question.

• Final‐impression techniques and materials for making complete and removable partial dentures 2018 · Cochrane All outcomes
  We did not find any trials for this comparison.
  0 studies
  No studies found

Ball (stud) attachment system vs Bar attachment system

• Interventions for replacing missing teeth: attachment systems for implant overdentures in edentulous jaws 2018 · Cochrane All outcomes

  Short term (1 to 3 years)
  Recorded by Kappel 2016 and Walton 2002; they did not provide usable data for inclusion in the review.
  2 studies
  GRADE not reported

Wax (fluid wax), two stage-two step selective pressure final impression vs Polysulfide rubber (elastomer)

It is very uncertain whether wax (fluid wax), two stage-two step selective pressure final… changes number of border adjustments and sore spots after insertion of denture compared with polysulfide rubber (elastomer) (very low certainty).

• Final‐impression techniques and materials for making complete and removable partial dentures 2018 · Cochrane All outcomes

  1 year
  RR 0.81 [0.38, 1.70]
  1 study · 27 participants
  Very low

Single-stage alginate impression (simplified method) vs Two stage-two step elastomer (silicone, polysulfide, or polyether) conventional method

It is very uncertain whether single-stage alginate impression (simplified method) changes mandibular denture satisfaction compared with two stage-two step elastomer (silicone, polysulfide, or polyether)… (very low certainty).

• Final‐impression techniques and materials for making complete and removable partial dentures 2018 · Cochrane All outcomes

  6 months
  SMD 0.21 [-0.11, 0.52]
  2 studies · 155 participants
  Very low

Ball (stud) attachment system vs Telescopic attachment system

• Interventions for replacing missing teeth: attachment systems for implant overdentures in edentulous jaws 2018 · Cochrane All outcomes
  Cepa 2017 assessed patient satisfaction but did not use validated measures and we could not use the data. Quality of life as assessed by a validated measure was not recorded.
  1 study
  GRADE not reported

Tooth-supported removable partial denture: different impression material, same final-impression technique vs The same technique with an alternative final-impression material

The review found no eligible studies for this question.

• Final‐impression techniques and materials for making complete and removable partial dentures 2018 · Cochrane All outcomes
  We did not find any trials for this comparison.
  0 studies
  No studies found

Single-stage alginate impression (simplified method) vs Two stage-two step elastomer (silicone, polysulfide, or polyether) conventional method

It is very uncertain whether single-stage alginate impression (simplified method) changes maxillary denture satisfaction compared with two stage-two step elastomer (silicone, polysulfide, or polyether)… (very low certainty).

• Final‐impression techniques and materials for making complete and removable partial dentures 2018 · Cochrane All outcomes

  6 months
  SMD -0.02 [-0.34, 0.29]
  2 studies · 155 participants
  Very low

Single-stage alginate impression (simplified method) vs Two stage-two step elastomer (silicone, polysulfide, or polyether) conventional method

It is very uncertain whether single-stage alginate impression (simplified method) changes participant-reported oral health-related quality of life (OHIP-EDENT) compared with two stage-two step elastomer (silicone, polysulfide, or polyether)… (very low certainty).

• Final‐impression techniques and materials for making complete and removable partial dentures 2018 · Cochrane All outcomes

  1 month
  MD 0.05 [-2.37, 2.47]
  2 studies · 98 participants
  Very low

Ball (stud) attachment system vs Magnetic attachment system

• Interventions for replacing missing teeth: attachment systems for implant overdentures in edentulous jaws 2018 · Cochrane All outcomes
  Two trials (Cune 2010; Naert 1999) reported patient satisfaction. However, we could not use any data from these studies. Quality of life as assessed by a validated measure was not recorded in any of the trials.
  2 studies
  GRADE not reported

Ball (stud) attachment system vs Magnetic attachment system

• Interventions for replacing missing teeth: attachment systems for implant overdentures in edentulous jaws 2018 · Cochrane All outcomes
  Recorded by Cristache 2014, Cune 2010 and Naert 1999; they did not provide usable data for inclusion in the review.
  3 studies
  GRADE not reported

Any attachment system for maxillary implant overdentures vs A different attachment system for maxillary implant overdentures

The review found no eligible studies for this question.

• Interventions for replacing missing teeth: attachment systems for implant overdentures in edentulous jaws 2018 · Cochrane All outcomes
  no estimate extracted
  Studies not reported
  No studies found

Ball (stud) attachment system vs Magnetic attachment system

It is very uncertain whether ball (stud) attachment system changes re-treatment: repair of attachment system (medium term) compared with magnetic attachment system (very low certainty).

• Interventions for replacing missing teeth: attachment systems for implant overdentures in edentulous jaws 2018 · Cochrane All outcomes

  Medium term (3 to 5 years)
  RR 1.75 [0.65, 4.72]
  1 study · 69 participants
  Very low

Alginate (two stage-two step final/wash impression) vs Silicone elastomer (two stage-two step)

• Final‐impression techniques and materials for making complete and removable partial dentures 2018 · Cochrane All outcomes

  2 weeks
  Silicone impressions 57.7% (41 participants), alginate impressions 23.9% (17 participants); both equally satisfactory for 7 (9.9%) and equally unsatisfactory for 6 (8.5%) (McNemar chi-square 12.02, 1 df, P = 0.0005).
  1 study · 71 participants
  GRADE not reported

Ball (stud) attachment system vs Telescopic attachment system

It is very uncertain whether ball (stud) attachment system changes prosthodontic maintenance: reline of implant overdenture (short term) compared with telescopic attachment system (very low certainty).

• Interventions for replacing missing teeth: attachment systems for implant overdentures in edentulous jaws 2018 · Cochrane All outcomes

  Short term (1 to 3 years)
  RR 2.33 [0.81, 6.76]
  1 study · 22 participants
  Very low

Ball (stud) attachment system vs Telescopic attachment system

It is very uncertain whether ball (stud) attachment system changes prosthodontic maintenance: matrix replaced (short term) compared with telescopic attachment system (very low certainty).

• Interventions for replacing missing teeth: attachment systems for implant overdentures in edentulous jaws 2018 · Cochrane All outcomes

  Short term (1 to 3 years)
  RR 1.75 [0.71, 4.31]
  1 study · 22 participants
  Very low

Single-stage alginate impression (simplified method) vs Two stage-two step zinc-oxide eugenol (ZoE) traditional method

• Final‐impression techniques and materials for making complete and removable partial dentures 2018 · Cochrane All outcomes

  3 to 6 months
  There was insufficient evidence of a clear difference between groups for operator-assessed quality of the dentures for retention and stability of dentures (Regis 2013).
  1 study
  GRADE not reported

Altered-cast impression technique (ACIP), polyether vs One-piece cast technique (OPC), polyether

• Final‐impression techniques and materials for making complete and removable partial dentures 2018 · Cochrane All outcomes

  1 year
  The study reported that 50 of 57 participants were moderately to completely satisfied, with no significant difference between the groups. Data not reported separately for each group.
  1 study · 57 participants
  Low

Ball (stud) attachment system vs Magnetic attachment system

The review found no eligible studies for this question.

• Interventions for replacing missing teeth: attachment systems for implant overdentures in edentulous jaws 2018 · Cochrane All outcomes
  no estimate extracted
  Studies not reported
  No studies found

Biofunctional Prosthetic System (BPS): closed-mouth two stage-two step final impression with addition silicone elastomer vs Conventional complete denture technique (CCD): open-mouth two stage-two step conventional technique using elastomer

• Final‐impression techniques and materials for making complete and removable partial dentures 2018 · Cochrane All outcomes

  3 months
  VAS median scores: BPS 86.5; CCD 88. No clear difference between groups
  1 study · 10 participants
  Very low