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At least 901 records · Page 50Linked to original sources
PubMed1991

Dentinal bond strengths and microleakage of a 4-META adhesive to amalgam and composite resin.

A 4-META-containing adhesive was evaluated for its ability to bond a composite resin and two types of amalgam to dentin. One group of composite resin was tested after 24 hours and another group after 24 hours of thermocycling. Shear bond strengths were: composite resin at 24 hours = 22.38 MPa; thermocycled composite resin = 20.86 MPa; spherical alloy = 3.38 MPa; admixed alloy = 3.84 MPa. Microleakage was evaluated after the 4-META adhesive was applied to cavity preparations and compared to that of a group treated with a cavity varnish. There was statistically significantly less microleakage in the 4-META group at both the occlusal and gingival margins.

Coloring Agents↗
PubMed1991

[On the clinical relevance of the dimensional behavior of silver amalgam. A comparative in vitro and in vivo study].

The clinical relevance of the dimensional behavior of six different gamma-2-free silver amalgam products was examined in comparative in vitro and in vivo trials. Dye penetration tests, roughness measurements, and inspection of the marginal fit using a scanner electron microscope all showed that the results of the in vivo and the in vitro trials were in good agreement and that there was no significant difference between the various products tested, despite the fact that they differed both in morphology and in composition. Copalite exerts a favorable influence on the marginal fit of amalgam restorations, not only in laboratory trials, but also clinically. The results obtained show that the behavior of an amalgam with respect to changes in volume is not the sole criterion by which its quality is to be judged. Amalgams with a pronounced contraction tendency will seal the marginal gap with their corrosion products (SnCl). Here copalite serves as a temporary stand-in. There was no leakage of metal ions from the restoration into the dentin for any of the products tested, including those with a high copper content.

Adult↗
PubMed1991

[Restoration of cervical lesions with glass ionomer cements].

Cervical lesions and their proper treatment still represent a considerable professional problem. The incidence of these lesions increases with aging of the population. The lesions have to be treated because of esthetic reasons, hypersensitivity to stimuli, and possible further loss of dental substance. Most of the restorative materials used to date have failed to fulfill both functional and esthetic requirements. In this study, a novel approach to the treatment of these lesions using type II glass ionomer cement, with an additional possibility of the application of the final composite layer to attain the maximal esthetic effect, was investigated. This filling was found to have great advantages over both classical fillings and the composite materials alone, because it chemically binds to dentin, exerts a marked caries-protective effect through a continuous release of fluor ions, and provides the best esthetic effect in combination with composite materials (when necessary).

Dental Caries↗
PubMed1991

Clinical evaluation of direct esthetic restorations in cervical abrasion/erosion lesions: one-year results.

One hundred sixteen cervical abrasion/erosion lesions were restored with one of the following techniques: (1) glass-ionomer cement, (2) composite resin with a dentinal bonding agent, or (3) composite resin with a glass-ionomer cement liner and a dentinal bonding agent. The restorations were assessed at baseline and at 6 months and 1 year postrestoration for retention, caries, color match, marginal staining, and surface texture. No statistically significant differences were found in retention, caries, color match, or marginal staining. A statistically significant difference was found with regard to surface texture: glass-ionomer cement restorations demonstrated a rougher surface than did the composite resin restorations. A substantial number of restorations composed of composite resin with a dentinal bonding agent demonstrated a color shift towards mismatch when evaluated at 6 months. This difference was not significant at the 1-year followup.

Bisphenol A-Glycidyl Methacrylate↗
PubMedDate not supplied

[Marginal leakage of amalgam restorations].

The authoress presents a revision work on a marginal microleakage around amalgam restorations. After a brief introduction in which some harmful aspects of its formation are made clear, a reference to the causes and tooth prevention against its formation follows.

Copper↗
PubMed1991

Biocompatibility of a glass ionomer luting agent. 2. Crown cementation.

In this experiment, 64 crown preparations were made in four primates. Final impressions, die fabrication, wax patterns and castings were achieved using conventional established clinical and laboratory techniques. Vented and unvented crowns were cemented with a glass ionomer cement (GI) and a zinc phosphate cement (ZOP). Some preparations were protected with calcium hydroxide liquid. On the same animals, in teeth not used for crowns, Class V cavities were prepared and GI and ZOP inserted by means of a pressure technique imitating hydraulic pressure generated during crown cementation. After periods of 5 and 60 days, the animals were sacrificed, the jaws dissected, fixed in formalin and prepared for histological evaluation. Of the 64 cemented crowns, one was unaccounted for. Of the unvented crowns with GI (5 days), vented crowns with GI (60 days), unvented crowns with ZOP (60 days), Class V with ZOP (5 days) and GI (60 days) with a remaining dentin thickness (RDT) of less than 1 mm, inflammatory responses of greater than or equal to 1 degree (on a scale 1-4 degrees) were observed. The use of liquid calcium hydroxide reduced the intensity of the reactions, in particular when small RDTs were present. It can be concluded that when RDTs of 1 mm or more were present, the cements in all groups were non-toxic. When it is estimated that the RDT is less than or equal to 1 mm, the use of a calcium hydroxide liner is recommended. Placement of luting agents in Class V preparations with pressure resulted in reactions resembling crown cementation.(ABSTRACT TRUNCATED AT 250 WORDS)

Analysis of Variance↗
PubMed1991

Maintenance of pulpal vitality using potassium nitrate-polycarboxylate cement cavity liner.

Following deep restorations in vital teeth, postoperative pain of various durations frequently occurs, even if the teeth were asymptomatic before treatment. In this study, a potassium nitrate-polycarboxylate cement was used as a liner and was found clinically to tend to preserve pulpal vitality and significantly eliminate or decrease postoperative pain.

Dental Cavity Lining↗
PubMedDate not supplied

[Varnishes and adhesives in the seal of silver amalgam restorations].

The object of this paper is to evaluate the marginal filtration occurring between restoration/teeth in cavities filled with silver alloy when using different cavity varnish and adhesives. In 50 teeth removed as a result of decay, cavities were prepaired on vestibular faces and were divided into 5 equal groups: Group A: with no caviti varnish; Group B: two coats of a linkin agent (Scotch Bond 3M); Group C: an amalgam liner base (Voco); Group D; two coats of copal varnish: Group E: an amalgam bond base (Carl San Remo, Germany). All groups were filled with a silver alloy. The teeth were inmersed in a fuchsin solution at different temperatures (17.37 degrees C and 50 degrees C) for 20 minutes. Longitudinal cuts were made for visualization under a stereoscopic magnifying glass. Each group was observed by five odontologists and was classified according to four categories: Grade I: no filtration: Grade II: less than 1/3 wall filtration; Grade III: more than 1/3 wall filtration; Grade IV: filtration in walls and floor. Teeth with pulp filtration were discarded. Total and percentage values were determined for each analysed group. The results revealed that: Group A: 100% of samples corresponds to Grade IV. Group B: 40% of sample falls within Grade II while the rest corresponds to the highest grade. Group C: 30% belongs to Grade II, 60% to Grade III and the remaining 10% to Grade IV; Group D: 30% falls within Grade I, while the remaining 20% and 50% correspond to Grades III and IV, respectively. Group E: 50% for Grade I and the rest in Grade II.(ABSTRACT TRUNCATED AT 250 WORDS)

Adhesives↗
PubMed1991

Microleakage of Class II silver glass ionomer/composite restorations.

This in vitro study examined the marginal integrity of Class II lesions using three restorative techniques. Class II preparations (MO and DO) were placed in 30 teeth. Half had the cervical margin placed 1 mm below the CEJ, the remaining had cervical margins 2 mm above the CEJ. The preparations were randomly restored using three techniques: 1) Glass ionomer liner and posterior composite resin; 2) Glass ionomer silver cermet placed in the proximal box to the contact area and the remainder restored with posterior composite resin; 3) Glass ionomer silver cermet only. All 30 teeth were loaded with 17 kg, thermocycled and stored in 37 degrees C solution for 30 days. The teeth were again loaded, immersed in 2% basic fuchsin solution for 24 hours, sectioned and photographed. Microleakage was calculated, according to the depth of dye penetration. Results demonstrated Techniques 1 and 2 to have less marginal leakage than Technique 3 when preparations remained in enamel and Techniques 1, 2 and 3 when preparations were below the CEJ. The chi-square test indicated a statistically significant difference between restoration technique and marginal microleakage (P less than 0.001).

Cermet Cements↗
PubMedDate not supplied

Twenty-four-month clinical trial of visible-light-activated cavity liner in young permanent teeth.

A clinical study of young permanent teeth for twenty-four months evaluated the use of a new product, VLC-Dycal, as a cavity liner. VLC-Dycal is a light-activated calcium hydroxide cavity liner. After twenty-four months, VLC-Dycal had a 91 percent success rate used as a liner with young permanent teeth. From the fifty-four teeth evaluated at twenty-four months, only five were failures. Failure occurred more frequently with DPC. Of the five teeth that became devital over the twenty-four months, three were DPC. The success rate for DPC was 70 percent. IPC had a success rate of 85 percent. None of the CCR procedures failed in the study. Because of the improved physical properties, VLC-Dycal was evaluated in a clinical trial for biological properties and proved to be a useful cavity liner for young permanent teeth.

Calcium Hydroxide↗
PubMed1991

Visible light-hardened glass-ionomer cement base/liner as an interim restorative material.

A visible light-hardening, glass-ionomer cement, dentinal base/liner has been used as a dentinal and enamel replacement restorative material for certain lesions in primary teeth. The material has all the advantages of glass-ionomer cements and the additional advantage of rapid hardening by light curing. The procedure for using the material as a restorative material in primary teeth is described, and several cases are documented.

Child, Preschool↗
PubMed1991

Resistance of cavity varnishes to solubility: a study in vitro.

Cavity varnishes are resinous materials used under permanent restorations to protect dental tissues from marginal leakage and harmful components of the restorative material. These materials are soluble in the fluids of the oral cavity. The purpose of this study was to investigate, in vitro, the degree of solubility of these materials in different solvents over a period of time, to obtain an idea of their effectiveness.

Dental Cavity Lining↗
PubMed1990

Effect of a copal varnish, ZOE or glass ionomer cement bases on microleakage of amalgam restorations.

The purpose of this study was to evaluate the sealing ability of four cavity preparation treatment modalities under amalgam restorations. Class V cavity preparations were placed in 20 extracted teeth and randomly divided into four groups of five teeth each (10 restorations for each group): 1) no liner; 2) two applications of Copalite; 3) a base of IRM; and 4) a base of Chelon-Silver. After assigned cavity preparation treatment was accomplished, the teeth were restored with amalgam. The restored teeth were subjected to thermocycling and subsequently stained with basic fuchsin. The teeth were longitudinally sectioned and dye penetration recorded. Amalgam restorations with a Copalite or Chelon-Silver base exhibited significantly less microleakage than those amalgam restorations with an IRM base or no cavity preparation treatment. With the Copalite varnish, microleakage extended beyond the axial wall (toward the pulp chamber through the dentinal tubules) while with the Chelon-Silver base, microleakage was limited to the restoration-tooth interface.

Dental Amalgam↗