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Abstract:The present study aims to determine the level of oral hygiene, periodontal status and treatment needs, indicating if there are differences between men and women, in 12-year-old students from Castro, Los Lagos region, during March and April of 2014. A cross-sectional study was carried out. A total of 242 12-year-old students from municipal and subsidized private schools in Castro were selected through a stratified random sample representative of each school. Students were evaluated by a calibrated examiner to determine the Simplified Oral Hygiene Index (OHI-S) and the Community Periodontal Index of Treatment Needs (CPITN). Data were transferred to a Microsoft Excel spreadsheet and statistically analyzed to calculate the amount and percentage of the variables. Mann-Whitney U-test was used for comparison between genders. From the total, 59.5% of the students have regular hygiene. Also, 86.4% of the assessed adolescents have gingivitis and 13.6% of them have periodontitis. The periodontal treatment need indicates that 58% of the students require oral hygiene instructions and scaling. No statistically significant differences were found for gender. There is a higher prevalence of periodontal diseases associated with regular oral hygiene than the regional and national reference in 12-year-old adolescents in Castro. Then, it is necessary to teach and promote specific public health strategies based on epidemiological data.

Aim: To determine periodontal status of fixed single prostheses (FSP) installed in 2013 at Austral University of Chile, and its contralateral homologue (CH). Methods: A group of patients with FSP installed during 2013, who met the selection criteria and agreed to participate in the study were evaluated. Probing depth, attachment level; bleeding on probing and dental plaque index for each FSP and CH were measured in 2014; biological width invasion was also evaluated. One FSP and one CH were measured per patient, and in 6 sites for each tooth. Results: Seventy-four patients were evaluated. The majority were women (73%); posterior teeth accounted for 63.5%. The majority of participants had history of previous periodontal disease (85.1%), of which 58.7% was Periodontitis. Six of the patients with a history of gingivitis progressed to periodontitis (23.07%); while 100% of patients with no history of periodontal disease maintained their condition. Only 4 of the FSP evaluated showed biological invasion width. Discussion: Similar results were found for FSP and CH teeth with respect to probing depth, clinical attachment level and bleeding on probing. However, a difference in relation to dental plaque index was observed: positive in 58.1% CH and positive in 29.7% FSP. Under the conditions of this study, it is concluded that the periodontal status of teeth with FSP does not differ from CH.