Screening and selection criteria
RPDs
Studies that reported outcome data for both digitally and conventionally fabricated RPDs or clasp samples were included. All related studies with an English abstract were included in this review. For control group, only RPDs fabricated by CLW were included. RPDs fabricated by digital technologies, including AM, SM, HM and indirect digital technologies were included as intervention group.The main outcome for this review was fit accuracy in the rest region, which was defined as the gap distance in micrometers between the rests and their corresponding rest seats. Randomized controlled trials (RCT), non-randomized clinical studies and in vitro studies were included. Case reports, case series, expert opinions, commentaries, editorials, reviews, and conference abstracts were excluded. A study that was not accessible to read in full or was not available in the databases was also excluded (Table Inclusion and exclusion criteriaA reference manager software program (EndNote v.X9.3.1) was used and the duplicates were discarded electronically. The remaining articles derived from the extensive search were screened through title and abstract by two reviewers (JQ, DW) independently. The full-text was checked if title and abstract provided insufficient information with regards to the inclusion criteria. Finally, articles selected from the inclusion and exclusion criteria were further screened in full-text and double-checked by both reviewers (JQ, DW). Any disagreements at the above stages between reviewers were resolved by consulting a third reviewer (LS) and discussion until consensus was reached.