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At least 127 records · Page 7Linked to original sources
PubMed1992

Microleakage studies comparing a one-visit indirect composite inlay system and a direct composite restorative technique.

Problems related to leakage have been observed with direct-filled composite restorations. The development of indirect system of fabrication followed by cementation should theoretically reduce this phenomenon. The present study compares the leakage around directly placed composites with composite inlays prepared by a surgery-based system. The results indicate that the amount of leakage is reduced with the inlay system, but that it is not eliminated.

Acrylic Resins↗
PubMed1981

Effect of cutting speeds and a cavity liner on the pulpal response to Nobetec.

The investigation was undertaken to determine the response to Nobetec, a modified zinc oxide-eugenol cement, widely used as a negative control material in pulpal studies, under conditions of high- and low-speed cavity preparation, with and without a cavity liner Dycal. The pulpal responses were evaluated at intervals of 2 days, 2 weeks and 8 weeks in the permanent maxillary and mandibular incisors in 26 vervet monkeys using labial Class V cavities prepared in 208 teeth. Nobetec was found to be more irritant to the dental pulp than Dycal although this difference was not statistically significant and the degree of irritation was low. The pulpal irritation caused by high- and low-speed cavity preparation was similar and choice of speed should be a matter of personal preference.

Animals↗
PubMed1977

Bacteria in cavities beneath intermediary base materials.

The ability of six different intermediary base materials to prevent bacterial entrance beneath silicate cement fillings was investigated in vivo in primary molars. After an observation period of 1 month, bacteria were found on the pulpal wall in two out of 10 cavities beneath Fluoritec and four out of 10 cavities beneath Durelon solid mixed, De Trey phosphate cement solid or creamy mixed. Beneath the intermediary base materials Dycal, zinc oxide-eugenol cement, Dropsin and Durelon creamy mixed, no bacteria were found. In cavities filled with silicate cement or silver amalgam only, bacteria were observed in nine out of 10 and in five out of 10 cavities, respectively.

Bacteria↗
PubMed1990

Marginal adaptation of resin in relation to application technique and use of a calcium hydroxide liner.

The marginal adaptation of a restorative resin was examined in cone-shaped cavities prepared in extracted human teeth. The use of a thin layer of a Ca(OH)2 liner in the bottom of the cavities did not influence the wall-to-wall (wtw) polymerization contraction and it did not affect the gap-reducing efficacy of a dentin-bonding agent. The wtw contraction was markedly increased when the restorative resin was applied in two layers parallel to the free surface of the cavity; the reason for this is supposed to be that the ratio between the volume of the filling (V) and the area of the cavity wall (A) is increased for the second layer compared to the V/A ratio found in cavities filled with one increment.

Bisphenol A-Glycidyl Methacrylate↗
PubMed1993

Correlation between depth of cure and temperature rise of a light-activated resin.

The temperature rise, caused by 10 different curing units, in a prepolymerized resin specimen was examined. For all units, the temperature increase in a 60-s cycle followed a logarithmic curve, with the most effective light sources giving the highest temperature rise. In the surface layer the change of temperature ranged between 3.6 and 29.2 degrees C, and 3.2 mm below the irradiated surface between 1.5 and 12.3 degrees C. The use of a 2-mm-thick isolating layer of glass ionomer resulted in a significant reduction in the temperature increase. The correlation between the depth of cure and the temperature rise was of an exponential or power nature; i.e., a small increase of the depth of cure was followed by a disproportionately high increase in temperature.

Chemical Phenomena↗
PubMed2005

Scanning electron microscope analysis of internal adaptation of materials used for pulp protection under composite resin restorations.

PURPOSE: The aim of this study was to evaluate the interfacial microgap with different materials used for pulp protection. The null hypothesis tested was that the combination of calcium hydroxide, resin-modified glass ionomer, and dentin adhesive used as pulp protection in composite restorations would not result in a greater axial gap than that obtained with hybridization only. MATERIALS AND METHODS: Standardized Class V preparations were performed in buccal and lingual surfaces of 60 caries-free, extracted human third molars. The prepared teeth were randomly assessed in six groups: (1) Single Bond (SB) (3M ESPE, St. Paul, MN, USA); (2) Life (LF) (Kerr Co., Romulus, MI, USA) + SB; (3) LF + Vitrebond (VT) (3M ESPE) + SB; (4) VT + SB; (5) SB + VT; (6) SB + VT + SB. They were restored with microhybrid composite resin Filtek Z250 (3M ESPE), according to the manufacturer's instructions. However, to groups 5 and 6, the dentin bonding adhesive was applied prior to the resin-modified glass ionomer. The specimens were then thermocycled, cross-sectioned through the center of the restoration, fixed, and processed for scanning electron microscopy. The specimens were mounted on stubs and sputter coated. The internal adaptation of the materials to the axial wall was analyzed under SEM with x1,000 magnification. RESULTS: The data obtained were analyzed with nonparametric tests (Kruskal-Wallis, p < or = .05). The null hypothesis was rejected. Calcium hydroxide and resin-modified glass ionomer applied alone or in conjunction with each other (p < .001) resulted in statistically wider microgaps than occurred when the dentin was only hybridized prior to the restoration.

Bisphenol A-Glycidyl Methacrylate↗
PubMed1992

Direct posterior composite resin restorations: a review. 2. Clinical technique.

Despite the increased use of composite resin to restore posterior teeth, there is evidence that clinicians should be selective in their use of these restorations. This paper describes the clinical technique--preparatory procedures, preparation of the cavity, preparation for placement of composite resin, placement of composite resin and finishing of the restoration--for the relatively conservative use of composite resin in posterior teeth and reviews the literature to discuss briefly many of the controversial aspects of the technique.

Bicuspid↗
PubMed1992

The tunnel restoration--nine years of clinical experience using capsulated glass ionomer cements. Case report.

The clinical potential of the tunnel restoration is restrained by perceived difficulties of access to proximal caries and lack of long-term clinical data. This paper describes a technique that affords proximal access similar to that of a standard Class II cavity preparation and provides an evaluation of a technique, using capsulated glass ionomer cements. It is supported by more than nine years of clinical experience that confirms the viability of this procedure as an alternative to conventional Class II cavity restorations for initial proximal lesions.

Acid Etching, Dental↗
PubMed1996

An in vitro study of the distribution of silver and fluoride following application of 40 per cent silver fluoride solution to dentine.

An in vitro test system involving application of 40 per cent silver fluoride solution to prepared cavities of moderate depth in extracted teeth failed to demonstrate the passage of significant amounts of fluoride into the dental pulp, despite a very high concentration of fluoride (100,000 ppm) in the applied solution. The test system used may not be conducive to quantitative investigation of ionic transfer because of disruptions to pulp circulation and fluid flow through dentine following tooth extraction. For this reason, the results are inconclusive as to whether or not application of 40 per cent silver fluoride as a cavity varnish of liner and its use in the 'atraumatic' technique for treating deep caries, can be considered safe clinical procedures.

Adolescent↗
PubMed1998

Gap measurement and bond strength of five selected adhesive systems bonded to tooth structure.

The ability of a restorative material to bond and seal the interface with tooth structure is perhaps the most significant factor in determining resistance to marginal caries. Thus, the quality and durability of marginal seal and bond strength are major considerations in the selection of restorative materials. The purpose of this study was to compare the bond strength and marginal discrepancies of five adhesive systems: All-Bond 2, Clearfil Liner Bond, KB 200, ProBond and AELITE Bond. Twenty-five buccal and 25 lingual cavities were prepared in 25 caries-free extracted molar teeth, giving 10 cavities for each of the 5 adhesive systems. All teeth were restored with the resin composite Pertac Hybrid, or PRISMA Total Performance Hybrid with their appropriate adhesive systems. After restoration, the teeth were thermocycled, were stained with a 1.5% aqueous solution of a procion dye (reactive orange 14) and sectioned coronally with a saw microtome. Three sections of 200 microns thickness were prepared from each restoration which were then examined microscopically to measure marginal gap widths using a confocal tandem microscope. Shear bond strength measurements were carried out on the dentine bond using a universal testing machine. The All-Bond 2 adhesive system was found to have higher shear bond strength and to have the least gap width at the cementodentinal margin.

Adhesives↗
PubMedDate not supplied

Suppression of caries-related microorganisms in dentine lesions after short-term chlorhexidine or antibiotic treatment.

This study investigated the efficiency of a chlorhexidine varnish and an antibiotic paste in suppressing the cultivable microflora of deep dentine cavities in a stepwise excavation procedure. Subsequent to enamel preparation and removal of the central biomass, infected dentine was sampled from the cavity floor. Ten cavities each were either covered with the 1% chlorhexidine- and 1% thymol-containing varnish Cervitec (CE), the demeclocycline hydrocortisone-containing ointment Ledermix (LE) or received no treatment as control (CO). A compomer composite was used as intermediate restorative. Cavities were reassessed after 6 weeks and again dentine samples were microbiologically investigated for total viable counts, mutans streptococci and lactobacilli. After 6 weeks a significant reduction of the total viable counts was observed in the LE group (p = 0.011) compared to the control, whereas no differences were found in the CE group (p > 0.05). Mutans streptococci were rarely recovered at baseline and after 6 weeks. Compared to the CO group counts of lactobacilli were significantly reduced in the CE and LE groups (p < 0.05). Lactobacillus species were frequently recovered at baseline and after 6 weeks of observation. Lactobacillus rhamnosus was the predominant species in all samples investigated. Application of CE or LE resulted in reduced counts of lactobacilli after a period of 6 weeks. Although none of the materials completely eliminated the viable microorganisms, the use of LE was more effective than CE in reducing the total anaerobic microorganisms associated with carious dentine.

Actinomyces↗
PubMed1989

Bactericidal efficacy of metronidazole against bacteria of human carious dentin in vivo.

The bactericidal efficacy of metronidazole (MN) against bacteria of carious dentin was estimated by measuring bacterial recovery with or without application of MN to dentinal lesions in vivo. More than 10(3) colony-forming units of bacteria per milligram of sample were recovered from the samples of carious dentin. However, none were recovered from the samples of dentinal lesions which had been covered by alpha-tricalcium phosphate (TCP) cement containing MN in situ for 1 day, 1 month, 1 year and/or 2 years in vivo. Placebo experiments in which carious dentin was covered by TCP cement without MN showed that TCP itself was not bactericidal. Bactericidal efficacy of MN in situ is clearly demonstrated, indicating that MN is a valuable material in caries treatment to disinfect carious dentin.

Adolescent↗