Design.  The colour of enamel was recorded (normal, white, yellow or brown) in specific areas for ten extracted first permanent molars with MIH defects and ten extracted sound teeth. Laser fluorescence (LF) and

mineral density (MD) were measured for the same areas. A mixed model, using sample/tooth as a random effect, was used to estimate the relationship between the MD and the colour-coding, and between the MD and LF readings. Results.  The between-samples correlation coefficient for the colour coding and the MD was 0.99 (P < 0.001), and 0.83 (P < 0.001) for the LF and MD. Conclusions.  The degree of staining of MIH enamel, click here as assessed visually or by LF, may be used clinically to reflect the severity of the defect. “
“International Journal of Paediatric Dentistry check details 2011;

21: 422–431 Background.  The genotypic diversity of both Streptococcus mutans and Streptococcus sobrinus in children with different caries experience remains unclear. Aim.  To investigate the genotypic diversity of S. mutans and S. sobrinus in children with severe early childhood caries (SECC) and in caries-free (CF) children. Methods.  Stimulated saliva of 87 SECC and 91 CF children aged 3–4 years was collected and submitted to cultivation, and MS colonies were enumerated. The genomic fingerprint analysis of S. mutans and S. sobrinus was carried out using AP-PCR. Results.  One to five genotypes of S. mutans were colonized in an oral cavity of SECC and CF children; 85.5% Inositol oxygenase SECC children and 57.9% CF children harboured more than one genotype of S. mutans. One to three genotypes of S. sobrinus were detected from each SECC child; 31.25% SECC children harboured more than one genotype of S. sobrinus. And one genotype was colonized in each CF child. S. mutans isolates from different individuals displayed distinctive DNA fingerprints. Conclusions.  DNA fingerprints of S. mutans and S. sobrinus isolates from 3- to 4-year-old children displayed genetic polymorphism, and S. mutans has greater genetic diversity than S. sobrinus. SECC children harboured more genotypes of S. mutans and S. sobrinus

than CF children. “
“International Journal of Paediatric Dentistry 2011; 21: 23–28 Aim.  To investigate the prevalence and distribution of developmental enamel defects in children with cerebral palsy (CP) in Beijing, China. Design.  A total of 135 children aged 1.5–6 years with moderate or severe congenital CP diagnosed in Beijing Boai Hospital from year 2005 to 2009 were recruited. The children underwent dental examination at the hospital dental clinic. Results.  Enamel defects (opacity and/or hypoplasia) were found in 44 (32.6%) out of 135 CP children. Enamel hypoplasia was found in 35 (25.9%) of the CP children, opacity alone was found in 5 (3.7%) of the CP children, and mixed defects (opacity and hypoplasia) was found in 4 (3.0%) of the CP children.