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Biomedical subjects

R J Gruythuysen

Publications and source records attributed to R J Gruythuysen.

At least 37 records · Page 2Linked to original sources
PubMedDate not supplied

Prevalence of hidden caries.

Clinical evaluations of the first and second permanent molars were compared with radiographic evaluations of the same teeth, for 359 patients (between six and eighteen years old) of the pediatric department of the Academic Centre for Dentistry Amsterdam (ACTA). The teeth were professionally cleaned and dried before the clinical evaluation. Despite the thorough examination, taking into account the fact that all discolorations and/or decalcifications were noted, 15 percent of the teeth that did not show signs of enamel caries clinically, showed a dentine lesion on the bitewing radiograph. These 15 percent of teeth with hidden caries were found in 7.5 percent of the population studied. The absence of clinical signs of occlusal enamel caries or dentine caries does not guarantee a sound dentition. Sealant treatment of teeth that are sound (both clinically and radiographically) is justified, therefore, soon after tooth eruption.

Adolescent↗
PubMedDate not supplied

The prevalence of postoperative sensitivity in teeth restored with Class II composite resin restorations.

Postoperative sensitivity is one of the problems a dentist can encounter after restoration of a tooth with composite resin. To reduce the possible causes of these complaints, the operative procedure has been adapted to some suggestions of other investigators. In this study the postoperative sensitivity was evaluated in a comparison between composite resin and amalgam: 244 (standard) class II restorations were made by three dentists in fifty-six patients. Each patient received one or two series of four experimental restorations: three of composite resin (Herculite XR, Clearfil Ray Posterior, Visiomolar) and one of amalgam (Tytin). All restorations were made according to a fixed protocol. The occurrence of postoperative sensitivity was recorded. Fifty-seven restorations showed a varying period of postoperative sensitivity; no case lasted longer than half a year. Molars have more postoperative sensitivity than premolars; the difference, however, is not significant (P greater than 0.05). The study shows further that there is no difference in postoperative sensitivity between restorations of composite resin and those of amalgam. The occurrence of postoperative sensitivity does not seem to be influenced by the choice of treatment procedure, type of tooth (premolar/molar), or by the patient or the dentist.

Adolescent↗
PubMedDate not supplied

Influence of fluoride in saliva during the early cariogenic changes in the enamel of boys and girls.

In boys and girls cariogenic changes in the dental enamel in relation to fluoride (F-) concentrations in stimulated and unstimulated saliva were studied in a six-month period. Also the use of various types of applications of F- was assessed. No difference in the use of F- between boys and girls before and after the interval was observed. Also no clear differences were found between boys and girls in the levels of F- in both types of saliva, determined at the end of the six-month period. The most important finding was that for all children, a significantly positive relationship was found between the disappearance of white spots turning into sound enamel (regression) and the F-concentration in unstimulated saliva. In addition, girls who developed new white spots had higher levels of F-, but those who developed new cavities had lower F- levels in both types of saliva. Apparently F- can prevent dental caries by acting very early on remineralization and demineralization processes in enamel surfaces.

Adolescent↗
PubMedDate not supplied

Polycarboxylate cement as a cavity-sealing material for the calcium hydroxide pulpotomy: a retrospective study.

Polycarboxylate cement was evaluated as a cavity-sealing material in calcium hydroxide pulpotomies of primary molars. The lifespan of these teeth (N = 55) were compared with that of the corresponding teeth on the contralateral sides. The success rate for the treatment was 75.5 percent after one year and at least 61.9 percent after two years. Significant shorter life-spans were found in primary teeth with pulpotomy than in those without it. However, polycarboxylate cement can be a suitable alternative for zinc oxide-eugenol as a cavity sealing material in calcium hydroxide pulpotomies.

Calcium Hydroxide↗
PubMedDate not supplied

Anxiety reduction with nitrous oxide: a permanent solution?

Anxiety scores of highly fearful children were registered during a control period after their curative treatment. The average length of the control period was seventy-two weeks. The anxiety scores of the children who were treated curatively with the aid of nitrous oxide were significantly lower than those of children from a behavioral management group. All the semiannual check-ups were performed without the use of nitrous oxide. Anxiety scores of all the children during the control period correlated closely with the anxiety scores of the curative treatment before and after the control period. It was concluded that nitrous oxide helps children to lower their anxiety levels during a long period after treatment. Influencing anxiety in highly anxious children might be characterized as a long-term process.

Behavior Therapy↗
PubMedDate not supplied

Radiographic assessments of Class II resin composite inlays.

Radiographic evaluations of indirect Class II resin composite inlays, shortly following their placement are presented. One hundred and eighty restorations of 'standard' conservative size were recorded using a beam-aiming device. Four radiographic characteristics were assessed of which the most important were: cervical marginal adaptation, voids in the material, and radiolucencies adjacent to the restoration. In comparison with amalgam restorations influencing factors are studied, and differences with direct resin composite restorations of a previous study are discussed. The inlays showed more deficiencies in cervical marginal adaptation than the amalgams (74 percent and 32 percent, respectively). Radiolucencies adjacent to the restorations and voids in the resin material were observed. The marginal adaptation appeared to show less deficiencies with two-surface than with three-surface restorations. Regarding the resin restorative materials, the limited radiolucency of one of the luting cements is discussed with respect to marginal adaptation. Comparison with direct restorations revealed a somewhat greater number of deficiencies in the cervical margins of indirect inlays.

Adult↗
PubMedDate not supplied

Dental treatment of fearful children using nitrous oxide. Part 4: Anxiety after two years.

A group of highly fearful children were treated using behavioral management, or nitrous oxide and behavioral management. This article describes the childrens' fears during the first curative treatment one to two years after the first treatment phase, and to study whether the reduction in the child's anxiety level found previously is of a permanent nature. The results of this study indicate that fear reduction using behavioral management is not permanent: the first curative treatment after seventy-two weeks results in significantly higher fear scores (PS). When combining the behavioral management with nitrous oxide, the fear scores show the same low level as at the previous treatment. The fear score during the last session of a course of treatment is clearly related to the score of the following curative session, even if it takes place two years later.

Adaptation, Psychological↗
PubMedDate not supplied

Evaluation of occlusal marginal adaptation of Class II resin composite inlays.

In this paper, the results of a clinical study of the occlusal marginal adaptation of indirect Class II resin composite inlays are presented. The margins of 180 resin composite and 60 amalgam restorations, made by three dentists, were assessed, shortly following their placement. An indirect, photographic method has been applied to assess marginal adaptations. The restorations were classified into excellent and non-excellent marginal adaptation categories and on this basis influencing factors were determined. Resin composite inlays appeared to have a greater percentage of 'excellent' margins than amalgam restorations (46.1 percent and 6.7 percent, respectively). The dentist was the variable that most influenced the marginal adaptation. Variability in the period elapsing between applying the restoration and conducting the assessments is discussed as a factor that may impair a fair comparison with initial results for direct composites. Nevertheless, based on the literature, differences in initial marginal adaptation between direct and indirect restorations are described.

Adult↗
PubMedDate not supplied

Evaluation of occlusal marginal adaptation of Class II resin-composite restorations.

This paper describes the results of an evaluation of the occlusal marginal adaptation of Class II restorations in a clinical trial. The margins of 183 resin composite and 61 amalgam restorations, made by three dentists, were assessed. An indirect evaluative method has been applied, that uses a shadowing photographic technique to produce images of impressions. The restorations were classified into excellent and nonexcellent marginal adaptation categories and on this basis influencing factors were determined. Resin composite restorations appeared to show more 'excellent' margins than amalgam restorations (64.5 percent and 21.3 percent, respectively). The variable mainly influencing the marginal adaptation of the composite restorations was the dentist. In addition, the influence of an occlusal level is discussed, since a difference of marginal adaptation between bevelled and nonbevelled parts of the occlusal outline was observed.

Adult↗