L B Oliveira

Publications of L B Oliveira

• Salt fluoridation: a meta-analysis of its efficacy for caries prevention.

  Authors: V Yengopal, U M E Chikte, S Mickenautsch, L B Oliveira, A Bhayat

  SADJ : journal of the South African Dental Association = tydskrif van die Suid-Afrikaanse Tandheelkundige Vereniging. 03/2010; 65(2):60-4, 66-7.

  The aim of this meta-analysis was to assess the caries preventive effect of Salt fluoridation (SF) in the permanent dentition in children. THE OBJECTIVES WERE TO COMPARE: (1) the caries preventiveThe aim of this meta-analysis was to assess the caries preventive effect of Salt fluoridation (SF) in the permanent dentition in children. THE OBJECTIVES WERE TO COMPARE: (1) the caries preventive effects of SF versus no exposure in different age cohorts (6-8; 9-12; and 13-15 years old); (2) SF versus other community based interventions (milk or water fluoridation [WF]). 9 English and 2 non-English databases were searched for papers that reported on the caries preventive effect of groups (with controls) that were exposed to SF in the form of mean DMFT scores with standard deviations. Differences in exposed and nonexposed groups were computed on the basis of weighted mean differences (WMDs) with 95% confidence intervals (CIs). For 6-8 year olds, the pooled reduction in DMFT scores was -0.98 [95% CI: -1.68 to -0.29]; for 9-12 year olds, it was -2.13 [95% CI: -2.55 to -1.70] and for the 13-15 year old groups, -4.22 [95% CI: -6.84 to -1.55]. All the analyses favoured the SF groups (p <0.001). For SF versus WF, there was no difference (-0.11 reduction [95% CI: -0.29 to +0.07]). Within limitations, the pooled estimates of the WMDs for the different age cohorts favoured SF versus no exposure.

• Feasibility of the International Caries Detection and Assessment System (ICDAS-II) in Epidemiological Surveys and Comparability with Standard World Health Organization Criteria.

  Authors: M M Braga, L B Oliveira, G A V C Bonini, M Bönecker, F M Mendes

  Caries research. 06/2009; 43(4):245-249.

  This study evaluated the feasibility of using the International Caries Detection and Assessment System (ICDAS-II) in epidemiological surveys and compared ICDAS with WHO criteria. Two hundred andThis study evaluated the feasibility of using the International Caries Detection and Assessment System (ICDAS-II) in epidemiological surveys and compared ICDAS with WHO criteria. Two hundred and fifty-two children (36-59 months old) in Amparo, Brazil, were each examined by 2 examiners using ICDAS-II or WHO criteria. Dmf-t, dmf-s, caries prevalence and examination time were calculated using both systems. ICDAS-II was comparable to standard criteria when the cut-off point was score 3. Examination by ICDAS-II took twice as long as by WHO criteria. In conclusion, ICDAS-II, besides providing information on non-cavitated caries lesions, can generate data comparable to previous surveys which used WHO criteria.

• Absence of carious lesions at margins of glass-ionomer and amalgam restorations: a meta- analysis.

  Authors: S Mickenautsch, V Yengopal, S C Leal, L B Oliveira, A C Bezerra, M Bönecker

  European journal of paediatric dentistry : official journal of European Academy of Paediatric Dentistry. 04/2009; 10(1):41-6.

  AIM: To report on the absence of carious lesions at margins of glass ionomer cement (GIC) and amalgam restorations. METHODS: Six Anglophone and 1 Lusophone databases were searched for articles up toAIM: To report on the absence of carious lesions at margins of glass ionomer cement (GIC) and amalgam restorations. METHODS: Six Anglophone and 1 Lusophone databases were searched for articles up to 5 January 2008. Inclusion criteria for articles were: (i) titles/abstracts relevant to topic; (ii) published in English, Portuguese or Spanish language; (iii) reporting on a randomised control trial. Exclusion criteria were: (i) insufficient random allocation of study subjects (ii) operator and subject not blinded, where appropriate; (iii) not all entered subjects accounted for at trial conclusion; (iv) subjects of both groups not followed up the same way. Articles were accepted only if they complied with all the criteria. Ten articles complied with the inclusion criteria and were selected for review. From these 4 were rejected and 6 articles reporting on 8 separate studies accepted. Due to aspects of heterogeneity, studies were sub-grouped before meta- analysis. RESULTS: Significantly less carious lesions were observed on single-surface GIC restorations in permanent teeth after 6 years as compared to restorations with amalgam (OR 2.64 - CI 95% 1.39 - 5.03, p= 0.003). No studies investigating multiple-surface restorations on permanent teeth were identified. Studies investigating carious lesions at margins of restorations in primary teeth showed no difference between both materials after 3 and 8 years. CONCLUSIONS: Carious lesions at margins of single-surface GIC restorations are less common than with amalgam fillings after 6 years in permanent teeth. No difference was observed in primary teeth. More trials are needed in order to confirm these results.

• TinyTate: Computing the Tate Pairing in Resource-Constrained Sensor Nodes

  Authors: L.B. Oliveira, D.F. Aranha, E. Morais, F. Daguano, J. Lopez, R. Dahab

  Network Computing and Applications, 2007. NCA 2007. Sixth IEEE International Symposium on; 08/2007

  After a few years of intense research, wireless sensor networks (WSNs) still demand new secure and cryptographic schemes. On the other hand, the advent of cryptography from pairings has enabled aAfter a few years of intense research, wireless sensor networks (WSNs) still demand new secure and cryptographic schemes. On the other hand, the advent of cryptography from pairings has enabled a wide range of novel cryptosystems. In this work we present TinyTate, the first known implementation of pairings for sensor nodes based on the 8-bit/7.3828-MHz ATmega128L microcontroller (e.g., MICA2 and MICAz motes). We then conclude that cryptography from pairings is indeed viable in resource-constrained nodes.