Risk factors for tooth loss with a mean follow-up period of 13.9 years in supportive periodontal therapy patients.
BACKGROUND
Clinical evidence indicates that there are various risk factors of tooth loss. However, the degree of this risk among other risk factors remains unclear. In this retrospective cohort study, the authors evaluated the hazard ratios of several risk factors for tooth loss.


METHODS
Included patients had all been treated for dental disorders, were in the supportive phase of periodontal therapy by dental hygienists, and visited a Japanese dental office continually during a 10-year period. Periodontal parameters, tooth condition, and general status of all teeth (excluding third molars) at the initial visit and at least 10 years later were evaluated by using multiple classification analysis.


RESULTS
The authors evaluated a total of 7584 teeth in 297 patients (average age: 45.3, mean follow-up time: 13.9 years) Non-vital pulp was the most significant predictor of tooth loss according to Cox hazards regression analysis (hazard ratio: 3.31). The 10-year survival rate was approximately 90% for teeth with non-vital pulp and 99% for teeth with vital pulp. Fracture was the most common reason for tooth loss.


CONCLUSIONS
Non-vital pulp had the most significant association with tooth loss among the parameters. Therefore, it is very important to minimize dental pulp extirpation.
['Kato|Tomotaka|T|', 'Fujiwara|Natsuki|N|', 'Ogawa|Tomohisa|T|', 'Numabe|Yukihiro|Y|']
D005500:Follow-Up Studies D006801:Humans D008875:Middle Aged D016016:Proportional Hazards Models D012189:Retrospective Studies D012307:Risk Factors D016388:Tooth Loss
Tooth loss Supportive periodontal therapy Retrospective cohort study Multiple classification analysis Non-vital tooth