Child, Preschool ; Dental Restoration, Permanent ; Dentition, Permanent ; Humans ; Infant ; Root Canal Therapy ; Tooth Avulsion ; therapy ; Tooth Crown ; injuries ; Tooth Extraction ; Tooth Fractures ; therapy ; Tooth Injuries ; therapy ; Tooth, Deciduous ; injuries ; Tooth, Impacted ; etiology

Child ; Dental Restoration, Permanent ; Dentition, Permanent ; Humans ; Incisor ; diagnostic imaging ; injuries ; Male ; Orthodontic Appliances ; Orthodontic Extrusion ; Orthodontics, Corrective ; Radiography ; Tooth Avulsion ; classification ; diagnostic imaging ; therapy ; Tooth Eruption

Child ; Humans ; Incisor ; abnormalities ; Maxilla ; Occlusal Adjustment ; Orthodontic Extrusion ; Tooth Abnormalities ; diagnosis ; etiology ; therapy ; Tooth, Impacted ; diagnosis ; etiology ; therapy

Child ; Humans ; Molar ; Orthodontic Wires ; Radiography, Panoramic ; Tooth Eruption, Ectopic ; diagnostic imaging ; pathology ; therapy

Child ; Composite Resins ; Dental Bonding ; Dental Restoration, Permanent ; Dentition, Permanent ; Humans ; Incisor ; injuries ; Tooth Crown ; injuries ; Tooth Injuries ; therapy

Child ; Dental Pulp Exposure ; etiology ; therapy ; Dental Restoration, Permanent ; Dental Restoration, Temporary ; Humans ; Incisor ; injuries ; Pulpotomy ; methods ; Root Canal Therapy

Child ; Child, Preschool ; Dentition, Mixed ; Humans ; Radiography, Panoramic ; Tooth Extraction ; Tooth Migration ; therapy ; Tooth, Impacted ; therapy ; Tooth, Supernumerary ; diagnostic imaging ; pathology ; surgery

Anodontia ; complications ; diagnostic imaging ; therapy ; Child ; Child, Preschool ; Dentition, Mixed ; Humans ; Malocclusion ; complications ; therapy ; Orthodontic Space Closure ; methods ; Orthodontics, Corrective ; Radiography, Panoramic

Bone Demineralization, Pathologic ; prevention & control ; Dental Caries ; prevention & control ; therapy ; Dental Restoration, Permanent ; Education, Dental ; Gingivitis ; prevention & control ; Humans ; Orthodontics, Corrective ; Preventive Dentistry ; education

OBJECTIVETo analyze the relationship between inorganic ingredients (Ca, P and F) concentration of plaque residues in the primary teeth and caries status, sugar exposure frequency.

METHODSSubjects were 93 of 3-5 years old children living in Beijing area. According to their caries status, they were classified into two groups: Severe early childhood caries(S-ECC) group and caries free(CF) group. Plaque samples were collected from subjects respectively. Ca, P and F concentration of plaque residues was measured by atomic absorption spectroscopy, spectrophotometer and fluoride electrode respectively. The information of daily sugar exposure frequency of children was obtained from a standardized questionnaire filled by their parents. The relationship between inorganic ingredients (Ca, P and F) concentration of plaque residues and daily sugar exposure frequency was analyzed and the relationship between inorganic ingredients (Ca, P and F) concentration of plaque residues and caries status in the S-ECC group was also analyzed.

RESULTSThe mean values for Ca, P and F concentration of plaque residues were lower in the S-ECC group, but the difference was not statistically significant (P > 0.05). The daily sugar exposure frequency in the S-ECC group was higher than that in the CF group. There were no relationships between Ca, P and F concentration of plaque residues and caries status (dmft, dmfs), sugar exposure frequency in the primary dentition.

CONCLUSIONPlaque residues from CF subjects did not contain a greater pool of calcium, inorganic phosphorus, and fluoride ions than that from S-ECC subjects.

Calcium ; Carbohydrates ; Child ; Child, Preschool ; Dental Caries ; Dental Caries Susceptibility ; Dental Plaque ; Fluorides ; Humans ; Phosphates ; Tooth, Deciduous