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V Qvist

Publications and source records attributed to V Qvist.

At least 37 records · Page 2Linked to original sources
PubMed1987

[Pulp reactions].

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Adhesives↗
PubMed1986

Restorative treatment pattern and longevity of amalgam restorations in Denmark.

A survey has been made of the reasons for placement and replacement of 6052 amalgam restorations in Denmark. In patients more than 16 years of age 48% of all restorations were made because of primary caries, and 52% were replacements of failed restorations. In primary teeth 64% and in permanent teeth of children 83% of the restorations were made because of primary caries. The reasons for replacement of restorations were dependent on dentition, age of the patient, and type of restoration. Secondary caries was the most frequent reason for replacement of failed restorations in permanent teeth, comprising a third of all replacements. Marginal discrepancies and bulk fracture of fillings were the other two major reasons. In primary teeth fracture and loss of fillings were the two major reasons for replacement of amalgam restorations, whereas secondary caries caused less than a quarter of all restorations to be replaced. The age of the restorations replaced ranged from 0 to 38 years, and half of the restorations replaced in permanent teeth of adults were less than 7 years old. A shorter longevity of failed restorations was noted in primary teeth and permanent teeth of children.

Adolescent↗
PubMed1986

Restorative treatment pattern and longevity of resin restorations in Denmark.

A survey has been made of the reasons for placement and replacement of 883 resin restorations in Denmark. In patients more than 16 years of age 39% of all restorations were made because of primary caries, and 61% were replacements of failed restorations. In primary teeth 63% and in permanent teeth of children 65% of the restorations were made because of primary caries. The reasons for replacement of restorations were dependent on dentition, age of the patient, and type of restoration. Secondary caries, loss of fillings, and marginal discrepancies were the most frequently recorded reasons for replacement of failed resin restorations. The age of the restorations replaced ranged from 0 to 15 years, and half of the replaced resin restorations in adults were just over 6 years old. In permanent teeth in children half of the failed restorations were replaced within 2 years, whereas half of those in primary teeth were replaced within 1 year. Information on a selected material of old silicate cement restorations in adults showed that two-thirds of these were replaced owing to marginal discrepancies and lost fillings.

Adolescent↗
PubMed1985

Three-year caries increments after fluoride rinses or topical applications with a fluoride varnish.

251 9-12-yr-old children completed a 3-yr, double-blind, clinical trial of two caries preventive fluoride programs. Caries increments and progression patterns were compared in two groups of children who rinsed every fortnight with a 0.2% NaF solution or received biannual topical applications with a fluoride varnish (Fluor-Protector). Clinically recorded mean DFS increments were 3.3 +/- 0.2 (SE) in the rinse group and 3.5 +/- 0.2 in the varnish group. In both groups nearly half of these increments were recorded in the occlusal surfaces of second molars. The mean incremental DFS recorded radiographically on approximal surfaces of posterior teeth were 1.1 +/- 0.2 and 1.5 +/- 0.2 in the rinse and varnish group, respectively. None of the inter-group differences were statistically significant (P greater than 0.05). Detailed analyses of the radiographic scores revealed a similar and extremely slow caries progression in the two study groups and they strengthened the conclusion of equal clinical efficacy of the two treatments. None of the fluoride programs had been able to change preestablished patterns of caries development among the children.

Child↗
PubMed1985

Marginal adaptation of composite restorations performed in vivo with different acid-etch restorative procedures.

243 experimental Class V restorations using a chemically cured composite resin were inserted in human third molars with the conventional acid-etch restorative procedure and with eight modifications of this technique. The teeth were extracted following an observation period of 4 months. Sections from each cavity were stained and examined for bacteria on the cavity floor. Bacteria in more than 10% of the sections was used as the criterion for marginal leakage along a restoration. Results showed that non-composite resin applied as an intermediary layer in etched cavities or as a surface coating of immediately finished and re-etched restorations, beveling of the margins of preparations, and treatment of the etched cavities with the surface-active comonomer NPG-GMA before filling all significantly decrease the leakage occurrence in the oral environment. The observed differences between the modifications varied considerably but none of them was significant, and no additive effects were found.

Acid Etching, Dental↗
PubMed1985

Two-year assessment of anterior resin restorations inserted with two acid-etch restorative procedures.

Fifty-two pairs of Class III restorations in a microfilled resin Silar were inserted in acid-etched cavities. A bevel preparation was performed along the margin of one cavity (A) whereas the other cavity was treated with the surface-active comonomer NPG-GMA before filling (B). After finishing of the restorations, the surface of the type B filling was re-etched and covered with a layer of non-composite, low-viscous resin. Following a 2-yr observation period 65 restorations were classified as "good", 33 were "adequate" and 4 were "unsatisfactory" or were replaced during the study period. The only significant difference between type A and type B restorations was marginal discolorations which most frequently were observed along the beveled type A restorations. The occurrence of such failures was increased by marginal deficiencies and occlusion/articulation on the restorations.

Acid Etching, Dental↗
PubMed1985

Replica patterns on composite restorations performed in vivo with different acid-etch restorative procedures.

243 experimental Class V restorations using a chemically cured composite resin were inserted in human third molars with the conventional acid-etch restorative procedure and eight modifications of this technique. The teeth were extracted after 4 months and, following demineralization, the filings were examined in SEM concerning their enamel and dentin replica patterns on the inner cavity faced surface. Results showed a significant correlation between the enamel replica patterns and the marginal adaptation of the restorations while the dentin replica patterns did not influence the in vivo adaptation. Furthermore it was found that the improved adaptation obtained by low viscous resin applied as an intermediary layer in etched cavities is due to fewer porosities in the restorative material interface with enamel and dentin. Beveling of preparations prevents stress-induced fractures of unsupported enamel prisms along the cavity periphery. Treatment of etched cavities with the surface active comonomer NPG-GMA increases the general interfacial contact between resin restoratives and cavity walls, and surface coating of finished and re-etched restorations fills up spaces created along cavity margins during the filling and finishing procedure.

Acid Etching, Dental↗
PubMed1985

Effect of ethanol and NPG-GMA on replica patterns on composite restorations performed in vivo in acid-etched cavities.

29 experimental Class V restorations using a chemically cured composite resin were inserted in human third molars in cavities which after acid-etching had been treated with absolute ethanol. After extraction and demineralization of the teeth, the fillings were examined in SEM concerning their enamel and dentin replica patterns on the inner cavity-faced surface. The SEM findings were compared with previous findings concerning the replica patterns on fillings from acid-etched cavities and from cavities which after acid-etching had been treated with an ethanol solution of the surface active comonomer N-phenylglycine-glycidyl methacrylate (NPG-GMA). It was found that cavity treatment with absolute ethanol further improved the increased enamel replica patterns obtained with the NPG-GMA/ethanol comonomer solution while only the NPG-GMA/ethanol treatment improved the dentin replica patterns. Based on these results the effect of each of the two main components in the comonomer solution on replica patterns on resin restorations could be disclosed.

Acid Etching, Dental↗
PubMed1983

The effect of mastication on marginal adaptation of composite restorations in vivo.

The marginal adaptation of composite restorations placed in vivo in acid-etched cavities in teeth with and without antagonists was compared. The results showed that functional mastication has a major influence on the marginal adaptation of composite restorations in the oral environment and must therefore be considered in the planning of future leakage experiments.

Acid Etching, Dental↗
PubMed1980

Quantitative evaluation of the morphology of the inner surface of composite restorations.

The aim of the present study was to develop a method for quantitative evaluation of the morphology of inner surfaces of composite resin restorations. Twelve restorations made in vivo using the acid etch technique were examined in a scanning electron microscope at a magnification of x 2000. 2500 predetermined areas (6300 micron2 each) on the inner surfaces of the fillings were scored from 0 to 3 with respect to the impression of their rendering of morphologic details from the etched cavity walls. Based on all the scorings and parts of the scorings, estimates for the enamel and for the dentin relief on each of the fillings were calculated. The statistical comparison of these estimates that approximately 50 areas per filling might be scored to attain an objective and reliable quantitation of the surface morphology.

Acid Etching, Dental↗
PubMed1980

Correlation between marginal adaptation of composite resin restorations and bacterial growth in cavities.

The purpose of the present study was to correlate the marginal adaptation of composite fillings to the bacterial growth in the cavities. Forty-three cavities prepared in vivo on human third molars were acid etched and filled with the composite resin Concise. After 4 months the teeth were extracted and examined for marginal leakage along the restorations. After histologic preparation an average of 38 sections from each cavity were stained and investigated for bacteria on the cavity walls and in the exposed dentinal tubules. General marginal leakage was found in 14 of the restorations and bacterial growth in 12. For 35 of the 43 restorations there was a agreement between marginal leakage and bacterial growth (P = 0.0002). Based on the results it is concluded that bacteria in a cavity can be used as an indicator of marginal leakage along the restoration.

Acid Etching, Dental↗