Effectiveness of hand and rotary instrumentations during biomechanical preparation in primary teeth: an umbrella review with evidence stratification.

Aims/objectives: Biomechanical preparation (BMP) of primary teeth often involves using hand and rotary instruments. This study aimed to assess the effectiveness of hand and rotary instruments during BMP in primary teeth.

Methods: A thorough search for relevant systematic reviews and meta-analyses (SRMAs) was conducted in four databases, including MEDLINE, EMBASE, Google Scholar, and the Cochrane Library. The primary outcome assessed was the instrumentation time (IT) for BMP, and the identified SRMAs were qualitatively analysed using the ROBIS tool. Furthermore, quantitative analysis, evidence stratification, and GRADE analysis of eligible SRMAs were performed using the browser-based R package metaumbrella software.

Results: Six SRMAs addressing the research question were included, with five being evaluated as having a high risk of bias (ROB). The findings indicated that the IT required for BMP in primary teeth was 3.2 min less (95% CI = 1.52 to 4.93; I = 96%; P = < 0.001) using rotary instruments compared to hand instruments, with a 'class IV' evidence stratification and 'very low' class of evidence.

Conclusions: Based on the existing evidence, it can be inferred that there is insufficient quality data to recommend the use of rotary instruments over hand instruments in primary teeth.