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Biomedical subjects

V Qvist

Publications and source records attributed to V Qvist.

43 records · Page 3Linked to original sources
PubMed1977

Marginal leakage along Concise in relation to filling procedure.

Bacteria beneath 58 class V Concise restorations on permanent molars in vivo were registered. After an observation period of 1-4 months bacteria were found in all 13 cavities filled with Concise only, in 14 out of 15 cavities filled with resin and Concise, in 12 out of 15 acid-etched cavities with Concise only and in 8 out of 15 acid-etched cavities filled with resin and Concise. Only the difference between the two procedures: Concise only and acid + resin + Concise, was significant. The occurrence of bacteria in the dentinal tubules beneath the cavities was greatest when the cavities had been etched.

Acid Etching, Dental↗
PubMed1977

Bacteria in cavities beneath intermediary base materials.

The ability of six different intermediary base materials to prevent bacterial entrance beneath silicate cement fillings was investigated in vivo in primary molars. After an observation period of 1 month, bacteria were found on the pulpal wall in two out of 10 cavities beneath Fluoritec and four out of 10 cavities beneath Durelon solid mixed, De Trey phosphate cement solid or creamy mixed. Beneath the intermediary base materials Dycal, zinc oxide-eugenol cement, Dropsin and Durelon creamy mixed, no bacteria were found. In cavities filled with silicate cement or silver amalgam only, bacteria were observed in nine out of 10 and in five out of 10 cavities, respectively.

Bacteria↗
PubMed1977

Microstructure of inner surfaces on composite restorations related to filling procedure.

The inner surfaces of 40 Concise restorations placed in vivo on permanent molars have been studied by scanning electron microscopy. Only grinding traces could be seen on fillings from cavities which had not been etched, while the morphologic structure of the enamel and dentin was reflected on fillings from acid-etched cavities. Application of low-viscous non-composite resin in the cavities before filling with the composite resin did not influence the enamel pattern on the fillings, while the amount of processes of resin corresponding to the dentinal tubules in etched cavities was significantly increased. In the discussion the difference in surface structure of the fillings is correlated to marginal leakage along similar restorations.

Acid Etching, Dental↗
PubMed1975

Pulp reactions in human teeth to tooth colored filling materials.

In each of 49 intact premolars from children between 9 and 15 years of age, one buccal and one lingual cavity were prepared. The 98 cavities were filled with either Silicap, Sevriton Simplified or Adddent XV. After 2 weeks 19, and after 6 months 30 of the teeth were extracted. The histologic investigation included remaining dentin, reduction in the number of odontoblasts, inflammatory cells, necrosis, tertiary dentin and bacteria. After 2 weeks a loss of odontoblasts and inflammation was seen beneath two-thirds of the cavities, and small necrotic areas in 11 of the 38 instances. After 6 months the loss of odontoblasts was a little more pronounced, the inflammation a little less, and necrosis could not be observed. Tertiary dentin was registered beneath most of the cavities after 6 months. The reactions to the three filling materials were quite similar in quality and quantity. The amount of remaining dentin influenced the degree of inflammation and amount of tertiary dentin after 6 months beneath cavities filled with Silicap, and inflammation after 2 weeks and 6 months beneath Addent. Bacteria were observed in nearly all cavities 6 months after the treatment.

Adolescent↗
PubMedDate not supplied

Influence of different variables on the inter-municipality variation in caries experience in Danish adolescents.

This investigation sought to estimate the influence a number of variables had on the inter-municipality variation in caries experience across Denmark. Unit of measurement was the municipality with public clinics. Mean DMF-S and %DMF-S = 0 of 15- and 18-year-olds in 1999 were obtained from 204 and 143 municipalities, respectively, out of a total number of 206 municipalities with public clinics. The independent variables were: cost per child per year; children/dentist ratio; auxiliary personal/dentist ratio; fluoride concentration in the water supply [F]; average personal income; % of mothers of the 15- and 18-year-olds with < or =10 years education (EDU-15 or EDU-18); proportion of immigrants; and size of the municipality. Multiple regression analyses disclosed that [F] (p < 0.001) and EDU-15 (p < 0.001) were significant variables among the 15-year-olds explaining 45% of the variation in mean DMF-S and 31% of the variation in % DMF-S = 0. With respect to the 18-year-olds, [F] (p < 0.001) and average personal income (p < 0.001) explained 53% of the variation in mean DMF-S and 30% of the variation in %DMF-S = 0. Few municipalities were characterized as outliers with significantly lower or higher observed caries experience than expected. It is concluded that there is room for other explanatory factors--first and foremost the professional effort made in the individual Public Dental Health Service to control caries.

Adolescent↗