Better success rate for root canal therapy when treatment includes obturation short of the apex

Abstract

1 mm but <3 mm (group B), (c) obturated past the radiographic apex, including sealer (group C). The studies were independently assessed for quality with readers blinded to the names of the authors and their institutions, names of the journals, sources of funding, and acknowledgements. Statistical analyses were done using the DerSimonian and Laird estimates. RESULTS: Four studies met the inclusion criteria. In terms of percentage rates of success, the meta-analysis showed that obturation 0-1 mm short of the apex (group A) was better than obturation 1-3 mm short of the apex (group B); both were superior to obturation beyond the apex (group C). The success rate in group A was 28.9% better than group C and 5.9% better than group B (95% CI=-3.8%, 61.5%), P=0.08 and (95% CI=-1.3%, 13.1%), P=0.11, respectively. After adjustment for quality, the results remained unchanged. CONCLUSIONS: The results demonstrate that obturating materials extruding beyond the radiographic apex correlated with a poorer prognosis. In addition, we realised that standardised protocols are necessary in endodontic procedures and in dental research. If studies are to be compared and the information used clinically, the design of the studies must be similar and repeatable. The results of prospective studies will then be comparable and the data can be combined statistically, thereby creating a more powerful, clinically useful meta-analysis.