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Biomedical subjects

J F Roulet

Publications and source records attributed to J F Roulet.

104 records · Page 6Linked to original sources
PubMed1978

[The abrasion of amalgam and composites in the lateral dental region].

In 41 patients class 11 cavities each of the lower jaw were filled with the materials Adaptic, Concise cap, Epoxydent or amalgam. The models made from impressions were systemically measured by a coordinate measuring machine according to a procedure determined by us (measuring error of this method about 15 micron). After one year the following abrasions were found: amalgam 18 micron +/- 58 micron, Adaptic 92 micron +/- 97 micron, Concise Cap 146 micron +/- 75 micron, Epoxydent 38 micron +/- 50 micron. Evaluation of the clinical examination showed that the materials Concise and Epoxydent were significantly inferior as regards border closure than amalgam and Adaptic. We determined further that a large percentage of composite filling showed visible discoloration of the borders (Adaptic 42%, Concise 55%, Epoxydent 80%). Many of the fillings were discolored after a year. Adaptic was highly significantly different with 31.6% discolored fillings to both other materials (Concise 79%, Epoxydent 78.4%).

Bicuspid↗
PubMed1978

[Testing of the marginal closure of so-called carvable composites].

66 composite filings of the brands Classecond, Epoxydent and Compocap were examined for marginal fit. The two first brands can be carved, the latter cannot. The fillings were examined by vacuum color diffusion tests, and replicas of the fillings were viewed with the EM. 91% of the Compocap fillings were found to be color impermeable, while 64% of the Epoxydent and 55% of the Classecond fillings proved to be leaking at the margins. The EM examination showed that carving the fillings causes considerably more leakage and short margins. For this reasons, it is unadvisable to carve even the carvable composits. The use of such materials then of course becomes questionable.

Composite Resins↗
PubMed1978

[Description of an early medieval skull from Biel-Mett with peculiar dental findings].

During the excavation of a church in Biel a medieval cranium was found (600-700 a.c.) which showed a large radicular cyst in the middle facial area, located on tooth 16 which caused considerable facial deformation. Furthermore carious lesions and evidence of chronic periodontal disease were discovered, which gave some indications on the way of life the individual had conducted. The examinations proved that a combination of methods of examination was able to increase the yield of information on the given object. Such studies should be conducted more often on an interdisciplinary way.

Adult↗
PubMed1978

[Multiple "granulomas" of unknown origin; a clinical case].

A case of multiple mandibular periapical radiolucencies (granuloma) with unknown etiology is presented. A connection with herpes zoster, which formerly had occurred in the same area could not be found. Several theories are discussed, however none of them seem to fit the case inspite of thorough examination.

Dental Pulp↗
PubMed1978

[The abrasion of amalgam and composites in the area of the lateral teeth].

Four materials: amalgam, Epoxydent, Adaptic and concise Cap were filled after certain criteria into class II mandibular cavities and examined after one year. The very accurate models were submitted to measuring with a three-dimensional measuring device. The results were the following: amalgam 18 +/- 58 micron Epoxydent 38 +/- 50 micron Adaptic 92 +/- 97 micron Concise Cap 146 +/- 75 micron Only the first difference between amalgam and Epoxydent is statistically insignificant, the others are all relevant. Furthermore, a mean abrasion of functional cusps of 70 micron and a maximum abrasion of 300 micron could be observed. Clinically, relative to marginal adaptation and discoloration, Adaptic was clearly superior to the other two composites. Class II cavities must routinely be restored with amalgam, and composite "streets" must be strictly avoided.

Adolescent↗
PubMed1976

[Studies on the rim closure in composite resins in vivo].

On 2 monkeys, adhesive fillings with Concise, using the Enamel Bond technique were made on 8 permanent and 12 deciduous teeth. A clinical check about 1 year later showed good results in the permanent dentition while the results in deciduous teeth were varied (loss of substance, pigmentations). The examination of marginal fit by aniline blue and a vacuum technique showed that in permanent teeth, 87.5% were impermeable, in deciduous teeth only 25%. Examination in the REM showed a perfect adaptation of the filling material to the enamel at the margins, while cohesion fractures were found within the material. The surface of the material was found to be rough after functional use. The bad results in deciduous teeth is explained by the thinness of the enamel in the experimental animal and by its parafunctioning. It is deduced that adhesive fillings are stable and impermeable after 1 year, provided there is no functional abrasion possible. The results should be confirmed by further, longerlasting experiments

Animals↗
PubMedDate not supplied

Influence of dentin conditioning and contamination on the marginal integrity of sandwich Class II restorations.

This study investigated the influence of dentin conditioning and contamination on the marginal adaptation of Class II sandwich restorations. Large butt-joint MOD cavities with cervical margins located 1 mm below the CEJ were cut into 72 extracted human molars. Nine groups were filled using a total-bond technique with Z100 or a sandwich technique with either Vitremer or F2000 in combination with Z100. For all three material combinations three different pretreatments were compared: total etch, selective etch and dentin contamination with saliva and blood prior to primer/adhesive application. After water storage for 21 days and thermocycling (2000x, 5-55 degrees C) replicas were produced for quantitative marginal analysis in the SEM. Teeth were immersed in 0.5% basic fuchsin for 24 hours and dried. Percent dye penetration over the total marginal length was analyzed in three layers using a sequential grinding technique. Statistical analysis was performed using a two-way ANOVA. Post-hoc analyses were carried out with univariate Mann-Whitney-U-tests adjusting for multiple comparisons by a sequentially rejective test procedure (Bonferroni-Holm) at p < 0.05. Both F2000 and Vitremer sandwich restorations showed better marginal adaptation than Z100 total-bond restorations with all pretreatments. Acid etching of the dentin significantly influenced the marginal adaptation of Z100 total-bond restorations and Vitremer sandwich restorations. All types of restorations showed considerable microleakage. On contaminated dentin, sandwich restorations showed better marginal integrity than total-bond restorations. Marginal adaptation did not correspond with microleakage in all groups. In conclusion, F2000/Z100 and Vitremer/Z100 sandwich restorations show better marginal adaptation than Z100 total-bond restorations in large Class II cavities with cervical margins in dentin. Microleakage cannot predictably be prevented with the sandwich technique. Sandwich restorations seem to be less sensitive to contamination with saliva and blood.

Acid Etching, Dental↗
PubMedDate not supplied

An in vitro evaluation of the marginal integrity of a porcelain inlay system.

There is currently no consensus of opinion regarding form of the finish line for porcelain inlays. This study compared beveled and nonbeveled finishing lines. Twenty-four Class II MOD cavities of a standardised design were prepared in extracted premolar teeth. Twelve were finished using a half enamel occlusal bevel and 12 were not beveled. Porcelain inlays were fabricated and luted with a dual-polymerizing resin material. The completed restorations were stored in water, thermocycled, and analysed using a scanning electron microscope. The quality of the enamel/composite resin interface was found to be considerably better than that of the inlay/composite resin interface. The adaptation of composite resin to enamel was of equal quality for both beveled and nonbeveled preparations.

Composite Resins↗