Effects of different re-wetting techniques on dentin shear bond strengths.

Purpose: For contemporary hydrophilic resin adhesive systems, bonding to dentin is improved if the substrate is maintained in a hydrated state following acid-etching. The purpose of this study was to compare the dentin shear bond strengths of two single-bottle adhesives (one acetone-based and one ethanol-based) applied under different etched-dentin conditions: dry, wet, or dry and re-wetted with different solutions.

Materials And Methods: Bovine incisors (N = 120) were mounted in acrylic, polished to 600-grit, and randomly assigned to 12 groups (n = 10).

Shear bond strengths of one-bottle adhesives to oil-contaminated enamel.

Purpose: To evaluate resin bond strength to enamel contaminated with handpiece oil.

Materials And Methods: Bovine teeth were randomly assigned to six groups of 20 teeth each for treatment with one of six different bonding systems (five one-bottle and one multibottle). For each system, 10 enamel specimens were contaminated with handpiece oil before acid-etching and 10 were contaminated after acid-etching.

Bond strengths of nonrinsing adhesives.

Objective: The purpose of this study was to determine enamel and dentin bond strengths of a nonrinsing "all-in-one" adhesive and of a nonrinsing conditioner combined with a 1-bottle adhesive.

Method And Materials: Specimens were obtained from 240 bovine teeth ground to expose enamel or dentin surfaces. Ten enamel and 10 dentin specimens were randomly assigned to each of 12 different combinations of adhesive system (Prompt L-Pop; no etch + Prime & Bond NT; NRC + Prime & Bond NT; 36% phosphoric acid + Prime & Bond NT; no etch + Prime & Bond 2.

Effect of dentin deproteinization on microleakage of Class V composite restorations.

The role of the collagen fibers in dentin adhesion has not clearly been established. Therefore, this laboratory study evaluated the microleakage at resin-dentin and resin-enamel interfaces of Class V composite restorations after etching enamel and dentin with phosphoric acid (H3PO4) or after etching with H3PO4 followed by deproteinization with 5% sodium hypochlorite (NaOCl) to prevent the formation of a hybrid layer. Ten extracted human molars were used to prepare standardized Class V cavities on both buccal and lingual surfaces.

The effect of depth of dentin demineralization on bond strengths and morphology of the hybrid layer.

Previous studies have shown that different phosphoric acid-based etchants do not penetrate intertubular dentin to the same depth. The purpose of this study was to determine the effect of different phosphoric acid-based conditioners on dentin shear bond strengths of three one-bottle bonding systems and to evaluate the corresponding interfacial ultramorphology. The null hypothesis to be tested was that no correlation could be established between the depth of intertubular demineralization and dentin shear bond strengths.

Eighteen-month clinical evaluation of a filled and unfilled dentin adhesive.

Objective: The purpose of this study was to evaluate the performance of a filled (OptiBond Solo) and an unfilled (Prime & Bond 2.1) "one-bottle" adhesive in Class V restorations after 18 months of clinical service.

Methods: Thirty-three patients with non-carious cervical lesions were enrolled in the study.

Effect of a sodium hypochlorite gel on dentin bonding.

Unlabelled: It has been suggested that the hybrid layer (HL) does not play any important role in the mechanism of adhesion to dentin. To substantiate this hypothetical insignificance of the HL, sodium hypochlorite (NaOCl) has been used to remove collagen from etched dentin prior to bonding.

Objectives: The present study was conducted to determine the effect of a commercial 10% NaOCl gel on the dentin shear bond strengths and HL ultra-morphology of two simplified dentin adhesives.

Dentin bonding--state of the art 1999.

The adhesion of restorative materials to the hard components of tooth structure has been a goal pursued by many researchers ever since Buonocore established the foundation for adhesive and preventive dentistry. Based on the industrial use of phosphoric acid to obtain better adhesion of paints and resin coatings to metal surfaces, Buonocore proposed that phosphoric acid could be used to transform the surface of enamel to "render it more receptive to adhesion." Subsequent research indicated that the formation of taglike resin prolongations into the enamel microporosities was the leading bonding mechanism of resin to phosphoric acid-etched enamel.

Microleakage of Class V resin-based composite restorations using five simplified adhesive systems.

Purpose: To evaluate microleakage at enamel and dentin margins of Class V resin-based composite (RBC) restorations using five simplified adhesive systems, one self-etching adhesive, three commercial one-bottle adhesives and one experimental one-bottle adhesive.

Materials And Methods: Class V cavities (3 mm x 2 mm x 2 mm) were prepared in sound human molars with occlusal margins in enamel and gingival margins in dentin/cementum. Etch & Prime 3.

Bond strengths of new simplified dentin-enamel adhesives.

Purpose: To compare the in vitro shear bond strengths (SBS) of five simplified dentin adhesives. The tested hypothesis was that the recently introduced simplified adhesive systems would have similar or higher SBS than an existing simplified acetone-based adhesive used as a control.

Materials And Methods: 100 flat bonding sites were polished to 600-grit on the labial surface of bovine incisors mounted in acrylic resin.

A clinical, radiographic, and scanning electron microscopic evaluation of adhesive restorations on carious dentin in primary teeth.

Objective: The purpose of this project was to evaluate the performance of a dentin adhesive system on carious and noncarious primary dentin in vivo.

Method And Materials: Forty-eight primary molars with carious lesions were randomly assigned to 2 different treatments: group 1 (control, n = 24)--All identifiable, irreversibly infected dentin was removed prior to the application of the bonding agent and restorative material; group 2 (experimental, n = 24)--Irreversibly infected dentin was partially removed prior to the application of the bonding agent and restorative material. The control and experimental teeth were clinically monitored every 3 months and evaluated 12 months after restoration.

Effects of repeated use on bond strengths of one-bottle adhesives.

Objective: Most one-bottle adhesives contain organic solvents (acetone or ethanol) that displace the water entrapped within the network of collagen fibers in etched dentin. Acetone and ethanol are volatile substances that could easily evaporate from bottles during use. The objective of this in vitro study was to assess the effects of repeated opening of bottles on dentin shear bond strengths of 4 adhesives.

An ultra-morphological characterization of collagen-depleted etched dentin.

Purpose: To evaluate the ultramorphology of superficial and deep dentin after etching with 35% phosphoric acid (H3PO4) and after etching with 35% H3PO4 followed by deproteinization with 5% sodium hypochlorite (NaOCl).

Materials And Methods: Two dentin disks (superficial and deep dentin) were obtained from each of 10 extracted human third molars by slow-speed sectioning. Dentin was polished with wet 600-grit SiC abrasive paper for 1 min to provide smooth surfaces.

Molecular cloning, developmental expression, and cellular localization of the 70-kDa RPA-1 subunit of Drosophila melanogaster.

Replication protein A (RPA) is a highly conserved multifunctional heterotrimeric complex, involved in DNA replication, repair, recombination, and possibly transcription. Here, we report the cloning of the gene that codes for the largest subunit of the Drosophila melanogaster RPA homolog, dmRPA70. In situ hybridization showed that dmRPA70 RNA is present in developing embryos during the first 16 cycles.

The effect of a re-wetting agent on dentin bonding.

Objectives: Recently, a new generation of simplified one-bottle dentin bonding systems, sensitive to variations in the degree of substrate moisture, was introduced. This in vitro project compared the dentin bond strengths and interfacial ultra-morphology formed by three one-bottle bonding systems [OptiBond SOLO (ethanol-based), Prime&Bond 2.1 (acetone-based), and Single Bond (ethanol- and water-based)].

Shear bond strengths of one-bottle adhesives to moist enamel.

Purpose: This study evaluated bond strengths of six one-bottle bonding agents and a control (primer plus unfilled resin) to moist enamel.

Materials And Methods: One-hundred and five bovine teeth were randomly assigned to seven groups of 15. Enamel was etched for 15 seconds with 35% phosphoric acid.

Fluoride release from restorative materials and its effects on dentin demineralization.

As the use of adhesive restorative materials has increased during the last several years, interest in adhesive materials that release fluoride has also grown. The purpose of this study was to measure fluoride release from several adhesive restorative materials and to evaluate its effect on dentin resistance to demineralization and on bacterial metabolism in a modified in vitro system. Standardized cavities (1.

Ultra-morphological study of the interaction of dental adhesives with carbamide peroxide-bleached enamel.

Purpose: To evaluate the effects of a carbamide peroxide bleaching agent on interfaces formed by two one-bottle dental adhesives to etched enamel. The null hypotheses tested in this study were that vital bleaching with a commercial 10% carbamide peroxide gel would not (1) increase the concentration of oxygen in the superficial layer of enamel or (2) induce ultra-morphological changes in resin-enamel interfaces.

Materials And Methods: Five extracted human incisors were treated with 10% carbamide peroxide (Opalescence) for 4 h/day for 1 week and were compared with non-bleached teeth for oxygen, calcium, and phosphorus relative concentration using EDS.

Effect of acid etching and collagen removal on dentin wettability and roughness.

It was recently reported that removal of the collagen network from etched dentin does not affect dentin bond strengths. The aim of this study was to determine if the removal of the collagen fibers results in changes in dentin roughness and wettability. Twenty cary-free extracted human third molars were sectioned parallel to the occlusal surface to expose either superficial or deep dentin.

Effect of a re-wetting agent on the performance of acetone-based dentin adhesives.

Purpose: To compare the in vitro bond strengths of two acetone-based one-bottle dentin adhesives applied to four surface moisture conditions. The tested hypothesis was that wetting a dried dentin surface with an aqueous HEMA solution would result in bond strengths similar or higher than those obtained by leaving the surface moist as per manufacturers' instructions.

Materials And Methods: Eighty flat dentin bonding sites were polished to 600-grit on middle dentin of the labial surface of bovine incisors mounted in acrylic resin.

Laboratory evaluation and clinical application of a new one-bottle adhesive.

Purpose: The purposes of this project were to compare the enamel and dentin bond strengths of a new nanofilled one-coat adhesive system with its predecessor, an unfilled two-coat adhesive system; to analyze the dentin interfacial ultramorphology, using scanning and transmission electron microscopy (SEM and TEM); and to illustrate the clinical technique associated with the use of the new nanofilled one-coat adhesive system.

Material And Methods: Twenty flat dentin surfaces and 20 flat enamel surfaces were polished on the labial surface of bovine incisors mounted in acrylic resin. The specimens were equally and randomly assigned to four bonding groups: (1) dentin with Prime & Bond 2.

Direct posterior composite resin restorations: current concepts for the technique.

Due to the development of sound clinical procedures and evolution of advanced restorative materials, composite resins are being used with increasing frequency for direct posterior applications. When the clinical protocol for the use of composite resin is performed properly, this material can be utilized with success and predictability. This article presents the advantages and limitations of this restorative modality.

Effects of bleaching on teeth and restorations.

This article describes how at-home bleaching procedures affect teeth and restorative materials. Specifically, it discusses the effects of tooth-whitening systems on enamel surfaces, enamel and dentin bond strengths, marginal integrity, color, and other properties of restorative materials.

Enamel bond strengths of "one-bottle" adhesives.

Purpose: Several "one-bottle" dental adhesives recently have been introduced. These contain hydrophilic resin monomers that should readily wet tooth surfaces. Most also contain solvents that could increase enamel bond strengths by driving out residual moisture from enamel and increasing resin penetration.

The clinical performance of adhesives.

Objectives: Traditional mechanical methods of retaining restorative materials have been replaced to a large extent by tooth conserving adhesive restorative techniques. Because adhesives have been evolving so rapidly for the last few years, the timing is right for evaluating the clinical status of present day adhesives.

Data Sources: Current literature with regard to the clinical performance of adhesives has been reviewed.