Additive cast-fabrication has yet to be used as commonly in implant prosthodontics
as conventional methods. This review aimed to investigate the accuracy of additive
cast-fabrication in implant prosthodontics.The study protocol was registered in the
PROSPERO database (CRD42022374972). Reporting was based on the Preferred Reporting
Items for Systematic Reviews and Meta-Analyses 2020 guidelines, following the Cochrane
Handbook. Two-arm interventional studies that matched the PICO were included (Population:
dental typodonts with implants, Intervention: additive cast-fabrication, Comparator:
conventional cast-fabrication, Outcome: positional deviations). A systematic search
was conducted in three databases: PubMed (MEDLINE), EMBASE, and the Cochrane Library
(CENTRAL).Seven papers were included in the analysis of horizontal, vertical, and
root mean square (RMS) deviations. No significant differences were observed between
groups. The overall vertical mean deviation of the intervention group was -4.15 µm
[-24.88; 16.57], and the pooled mean absolute deviation was 22.43 µm [8.33; 36.54].
In the control group, these values were 19.67 µm [-32.71; 72.04] and 24.62 µm [0.00;
59.42], respectively. The overall horizontal mean deviation in the intervention group
was 21.29 µm [-77.10; 119.68], and the pooled mean absolute deviation was 26.96 µm
[0.00; 70.81]. In the control group, the overall mean was 1.45 µm [-32.26; 35.15]
and the pooled mean absolute deviation was 25.05 µm [9.08; 41.01]. The mean RMS was
only slightly larger in the intervention group, with the value of 14.74 µm [-107.26;
136.74].Additive cast-fabrication is as accurate as the conventional method for the
position of implant analogs.
