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PubMed1990

[Complete sealing of dental cavities].

Notwithstanding the adhesive capacity of composites and glass-ionomers, bonding is jeopardized by the curing shrinkage. Curing contraction in an adhesive restoration is reduced partly by elastic strain, partly by plastic flow and partly by local fracture. With respect to the class V composite restoration, material properties are discussed and selection criteria are given in order to achieve a perfect marginal seal.

Composite Resins↗
PubMedDate not supplied

Reducing microleakage with the glass-ionomer/resin sandwich technique.

The effect on microleakage of two glass-ionomer/resin "sandwich" restorations and an incrementally placed microfilled resin restoration was tested in class 5 preparations extending apical to the cementoenamel junction. There was significantly less leakage detected in the sandwich restorations with microfilled resin placed in one or two increments. These results indicate that a glass-ionomer/microfilled resin sandwich restoration may significantly reduce microleakage in restorations extending below the cementoenamel junction.

Composite Resins↗
PubMedDate not supplied

A comparison of glass cermet cement and amalgam restorations in primary molars.

The aim of this clinical study was to compare the efficacy of GCC with amalgam as a filling material in primary molars. Two hundred fifteen restorations were placed in the first and second primary molars of seventy-four patients, ranging in age from four to ten years. The overall failure rate of amalgam is lower than that of GCC, but not significantly different. In older children, amalgam has greater advantages. An advantage of GCC is the short time required to fill the cavity. This might be an important factor in young and/or difficult children. In these cases amalgam cannot be placed under optimal conditions and, therefore, the results are less satisfactory. GCC is a viable alternative filling material.

Cermet Cements↗
PubMed1990

[Interfacial strength and microleakage pattern of paired visible light cured composites].

The clinical build up of visible light cured restorations in many cases is performed by layering different types of composites to obtain enhanced characteristics. The purpose of this study was to evaluate the interfacial strength and microleakage pattern of paired light-cured restorations. Two small particle (SP), two pure hybrid (HB) and two microfilled materials (MF) were selected. Cylindrical molds were used to prepare double layer specimens for the groups SP-HB, SP-MF, HB-MF and the controls. The last group was comprised of double layer specimens respectively. All the samples were immersed in normal saline at 37 degrees C and divided in two series. The first series included samples immersed in normal saline for 24 h and accelerated aged for 1 h in saline at 37 degrees C plus 1000 times thermal cycling between 5 degrees-60 degrees C. These samples were sheared off at 0.005 inch/min cross-head speed. The second series was composed of the samples subjected to the some experimental conditions but tested for their interfacial microleakage pattern utilizing the silver nitrate technique. According to the results pairing SP-MF, SP-HB increases interfacial strength compared to MF-MF, and HB-HB. The combination of HB-MF results in no statistical significance from MF-MF or HB-HB. Minimal leakage was detected in some cases but did not correlate to bond strength values.

Composite Resins↗
PubMed1990

[An in vitro study of wear and marginal fracture of posterior composite resins].

The collision-and-abrasion test was performed to reproduce the change of the surface structures of posterior composite resins by the stress of mastication and occlusion. Also the effect of the stress on wear and marginal fracture of composites was estimated qualitatively and quantitatively between the cavities with round bevel, straight bevel and butt joint. Extracted human posterior teeth were used as materials, and round or straight bevels were prepared along the margin of the standardized cavities using the bevel-preparing burs which had been designed by us. Light cured posterior composite resin (Occlusin/ICI Co.) was used as the restoration material. Also the surface structures were examined before and after the collision-and-abrasion test with the scanning electron microscope and laser measuring device for the surface morphology. The following results were obtained. 1. The collision-and-abrasion test with use of the slurry of polymethyl methacrylate (PMMA) powder as abrasive showed better reproducing ability of the in vivo change of the posterior composite restorations. 2. The collision stress was found to be one of the main causes for the wear and marginal fracture of composites. 3. It was found that the measurement for wear and marginal fracture of restorations could be performed three-dimensionally with high precision and in shorter time by using a laser device. 4. Marginal fracture resistance of composite resins is influenced by the adhesion with tooth structure and the marginal thickness. Therefore, the best marginal shape for posterior composite restoration is the round bevel.

Composite Resins↗
PubMedDate not supplied

[Porcelain veneers].

Through a clinical situation is shown the technique for the placement of a porcelain bonded veneer. Its significance with in the Esthetic Restorative Dentistry, advantages and disadvantages are emphasised. Together with the clinical procethe laboratorial steps are also shown. It was concluded that the bonded porcelain veneers are new options for a Restorative Dentistry more conservative with excellent esthetic results.

Acid Etching, Dental↗
PubMed1990

[Bond strength of etched enamel to direct composite resins, to indirect composite resins and to etched and silanized porcelain].

The adhesion to enamel of composite resin inlays are not documented as much as porcelain inlays and direct composite resins. This study evaluates the adhesion of a light cured composite resin (P-50) used in an indirect technique and secondarily polymerized by heat. No significant differences were found between adhesion of P-50 used with an indirect technique and adhesion of porcelain (Mirage). P-50 used with the direct technique yield adhesion values significantly lower than the indirect techniques.

Acid Etching, Dental↗
PubMed1990

[Ceramic bonded veneers. Toward a minimal prosthesis].

For years, odontology for aesthetic purposes meant significant tissue mutilation. Now, with bonded porcelain veneers, it is possible to achieve both an aesthetic result and a veneer preparation while restoring the function of anterior teeth. The clinical forms of such thin bonded restorations may vary considerably, from a simple veneer to a 3/4 crown. Although after five years of experience, prosthetic "enamelling" appears to be totally reliable, only long-term clinical results will determine the fatigue of thinly applied ceramics.

Acid Etching, Dental↗
PubMed1990

[Deflection and marginal leakage in cemented MOD inlays under loads parallel to the tooth axis].

Cemented inlays made of a soft and an extra hard gold casting alloy are subjected to load cycling with 50-200 N. The mesiodistal deflection is determined and marginal leakage is shown by dye penetration. Soft alloy inlays deflect significantly more, nearly 50% exhibit dye penetration caused by microleakage. On average, deflection does not occur with the extra hard alloy, dye penetration caused by microleakage takes place among 25% of the inlays only.

Dental Restoration, Permanent↗
PubMed1990

[Esthetic vestibular restorations using composite materials with the direct bonding technique. Interim clinical evaluation].

503 clinical controls of esthetic restorations made by the direct technique with composites were evaluated. Records were made of the type of restoration according to the nature of the surface receiving the bonded veneers. Also marginal breakdown chipping, fractures, discoloration, loss of glass etc were registered. Correlations were made with the age of the restorations, and with personal records as hygiene level, age, sex, smoking habits etc. Nearly 10% of the controls involved a correction or replacement of the veneer. Nearly 90% of the veneers needed repolishing but more than 90% of the patients stayed satisfied with the esthetic solution offered. The results were much worse in the poor hygiene and smoking groups.

Adult↗
PubMedDate not supplied

Posterior composite resin: use for anterior restorations.

Because of its low filler particle percentage, microfilled composite resins--traditionally recommended for anterior restorations--are extremely translucent. Function, especially in terms of shear-fracture-strength, has been another problem associated with the final restoration. Presented here is the concept of using posterior composite resin as an esthetic restorative material for anterior teeth.

Child↗