What do systematic reviews say?

Maxillary sinus lift (augmentation) with long implants vs Short implants (5 to 8.5 mm) without sinus augmentation

The review found no eligible studies for this question.

• Interventions for replacing missing teeth: augmentation procedures of the maxillary sinus 2014 · Cochrane All outcomes
  Treatment costs: no trials reported this outcome (extrapolated by the review authors). Additional costs were associated with the long-implant + augmentation group (extra surgery, biomaterial, barrier, hospitalisation…
  0 studies
  No studies found

Direct resin composite veneer vs Indirect resin composite veneer

The review found no eligible studies for this question.

• Direct versus indirect veneer restorations for intrinsic dental stains 2004 · Cochrane All outcomes
  Planned outcome; cost of treatment was not reported by the included trial.
  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
  Walton 2002 reported costs but the data could not be used due to failure to report means and standard deviations and only providing the median of the costs.
  1 study
  GRADE not reported

Ball (stud) attachment system vs Telescopic 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