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Clinical Oral Investigations

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Open Access 01-12-2012 | Original Article

Long-term outcome of primary non-surgical root canal treatment

Authors: A. H. C. Lee, G. S. P. Cheung, M. C. M. Wong

Published in: Clinical Oral Investigations | Issue 6/2012

Abstract

Aim

The aim of this study is to examine the survival distributions of primary root canal treatment using interval-censored data and to assess the factors affecting the outcome of primary root canal treatment, in terms of periapical healing and tooth survival.

Materials and methods

About one tenth of primary root canal treatment performed between January 1981 and December 1994 in a dental teaching hospital were systematically sampled for inclusion in this study. Information about the patients' personal particulars, medical history, pre-operative status, treatment details, and previous review status of the treated teeth, were obtained from dental records. Patients were recalled for examination clinically and radiographically. Treatment outcomes were categorized according to the status for periapical healing and tooth survival. The event time was interval-censored and subjected to survival analysis using the Weibull accelerated failure time model.

Results

A total of 889 teeth were suitable for analysis. Survival curves of both outcome measures (periapical healing and tooth survival) declined in a non-linear fashion with time. Median survival of the treated teeth was 119 months (periapical healing) and 252 months (tooth survival). Age, tooth type, pre-operative periapical status, occlusion, type of final restoration, and condition of the tooth/restoration margin were significant factors affecting both periapical healing and tooth survival. Apical extent and homogeneity of root canal fillings had a significant impact towards periapical healing (p < 0.05), but not tooth survival.

Conclusion

The longevity of treated teeth based on tooth survival was considerably greater than that of periapical healing. Both outcome measures were affected by a number of socio-demographic, pre-, intra-, and post-operative factors.

Clinical relevance

Root canal-treated teeth may continue to function for a considerable period of time even though there may be radiographic periapical lesion present. Decision for extraction may be due to reasons other than a failure of the periapical tissues to heal.

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Title: Long-term outcome of primary non-surgical root canal treatment
Authors: A. H. C. Lee
G. S. P. Cheung
M. C. M. Wong
Publication date: 01-12-2012
Publisher: Springer-Verlag
Published in: Clinical Oral Investigations / Issue 6/2012
Print ISSN: 1432-6981
Electronic ISSN: 1436-3771
DOI: https://doi.org/10.1007/s00784-011-0664-2

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Long-term outcome of primary non-surgical root canal treatment

Abstract

Aim

Materials and methods

Results

Conclusion

Clinical relevance

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Aim

Materials and methods

Results

Conclusion

Clinical relevance

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