Risk factors associated with the longevity of multi-rooted teeth. Long-term outcomes after active and supportive periodontal therapy.
OBJECTIVE
To investigate risk factors for the loss of multi-rooted teeth (MRT) in subjects treated for periodontitis and enrolled in supportive periodontal therapy (SPT).


METHODS
A total of 172 subjects were examined before (T0) and after active periodontal therapy (APT)(T1) and following a mean of 11.5 ± 5.2 (SD) years of SPT (T2). The association of risk factors with loss of MRT was analysed with multilevel logistic regression. The tooth was the unit of analysis.


RESULTS
Furcation involvement (FI) = 1 before APT was not a risk factor for tooth loss compared with FI = 0 (p = 0.37). Between T0 and T2, MRT with FI = 2 (OR: 2.92, 95% CI: 1.68, 5.06, p = 0.0001) and FI = 3 (OR: 6.85, 95% CI: 3.40, 13.83, p < 0.0001) were at a significantly higher risk to be lost compared with those with FI = 0. During SPT, smokers lost significantly more MRT compared with non-smokers (OR: 2.37, 95% CI: 1.05, 5.35, p = 0.04). Non-smoking and compliant subjects with FI = 0/1 at T1 lost significantly less MRT during SPT compared with non-compliant smokers with FI = 2 (OR: 10.11, 95% CI: 2.91, 35.11, p < 0.0001) and FI = 3 (OR: 17.18, 95% CI: 4.98, 59.28, p < 0.0001) respectively.


CONCLUSIONS
FI = 1 was not a risk factor for tooth loss compared with FI = 0. FI = 2/3, smoking and lack of compliance with regular SPT represented risk factors for the loss of MRT in subjects treated for periodontitis.
Department of Periodontology, School of Dental Medicine, University of Bern, Bern, Switzerland.
Giovanni E
GE
Salvi
Daniel C
DC
Mischler
Kurt
K
Schmidlin
Giedre
G
Matuliene
Bjarni E
BE
Pjetursson
Urs
U
Brägger
Niklaus P
NP
Lang
D000293:Adolescent; D000328:Adult; D000368:Aged; D010520:Aggressive Periodontitis / Q000628:therapy; D001641:Bicuspid / Q000473:pathology*; D055113:Chronic Periodontitis / Q000628:therapy; D015331:Cohort Studies; D005260:Female; D005500:Follow-Up Studies; D017823:Furcation Defects / Q000628:therapy; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D008963:Molar / Q000473:pathology*; D010349:Patient Compliance; D010514:Periodontal Pocket / Q000628:therapy; D010518:Periodontitis / Q000628:therapy*; D012189:Retrospective Studies; D012307:Risk Factors; D012907:Smoking; D015996:Survival Rate; D016388:Tooth Loss / Q000209:etiology*; D016896:Treatment Outcome; D055815:Young Adult
furcation involvement; periodontitis; smoking; supportive periodontal therapy; tooth loss