Retentive strength of an amalgam bonding agent: chemical vs light vs dual curing.

Dentin bonding agents have been shown to enhance retention of amalgam restorations by mechanical means. Little research is available on which mode of curing may optimize amalgam bonding. This in vitro study compared the bond strengths exhibited by three variations of a bonding agent, each using a different curing mode, with two earlier versions of amalgam resin liners and cavity varnish.

Effect of delayed application on shear bond strength of four fifth-generation bonding systems.

This study compared the shear bond strength of four adhesives dispensed 10 minutes prior to use to immediate dispensing and use. For half (40) of the specimens (n = 10), four different dentin bonding agents (One Coat, Bisco One Step, Prime & Bond 2.1 and 3M Single Bond) were used to bond a column of composite resin (Z100 Restorative Resin) to the dentin surface following manufacturers' directions and using the dentin bonding agent immediately after dispensing.

Shear bond strength of four filled dentin bonding systems.

This study compared the shear bond strength of four filled dentin bonding agents (Prime & Bond NT, One Coat Bond, OptiBond Solo, PermaQuik1) to a conventional unfilled Dentin Bonding agent (3M Scotchbond Multipurpose Plus). A column of composite resin (Herculite XRV Restorative Resin) was bonded to human dentin using the five dentin-bonding systems following the manufacturers' directions. The specimens were thermocycled 1000 cycles from 6 to 60 degrees C.

Cyclooxygenase-2 in synovial tissue and fluid of dysfunctional temporomandibular joints with internal derangement.

Purpose: This study investigated cyclooxygenase-2 (COX-2) gene expression in temporomandibular joint (TMJ) synovial tissue and fluid from patients with internal derangement.

Patients And Methods: Seventeen synovial tissue biopsy specimens and 16 synovial fluid samples were obtained from patients (1 male and 11 female) during arthroscopic TMJ surgery. The samples were frozen at -70 degrees C and, by using Northern and reverse transcription polymerase chain reaction (RT-PCR) analysis, the levels of COX-2 RNA in relation to beta-actin RNA message levels were determined.

The appropriate use of physical restraint: considerations.

Many people with severe and profound mental retardation have poor oral health and suffer from inadequate oral hygiene. They may also have neurological disorders and limited intellect, which can erect barriers to dental treatment, such as resistive behavior. Lack of an agreed-upon definition of physical restraint by clinicians or governmental and administrative nondental professionals adds to the problem.

Experimental validation of a finite element model of light-activated polymerization shrinkage.

An important consideration in improving the longevity of dental resin composite restorations is how to minimize the stresses that develop between resin composites and the wall of the preparation as the resin shrinks during polymerization. If the stress is too great, failure of the bonded interface occurs and microleakage results, with possible margin failure, staining, and secondary caries. This present project was performed to validate a previously developed FEM approach for investigating polymerization shrinkage.

Bone gap healing in the dog using recombinant human bone morphogenetic protein-2.

Purpose: This study investigated bone gap healing in a zygomatic arch defect using recombinant human bone morphogenetic protein-2 (rhBMP-2; Genetics Institute, Andover, MA) in an absorbable collagen sponge (ACS) carrier.

Methods: Zygomatic arch osteotomies were completed 15 mm apart and the arch was mobilized in 6 adult female mongrel dogs. The segment was then repositioned laterally 8 to 10 mm and secured with a titanium reconstruction plate.

Metal-matrix interface in reinforced glass ionomers.

Objective: In reinforced materials, interfacial bonding is critical for efficient transfer of stress from the matrix to the reinforcement. The goal of this study was to characterize the physical and chemical nature of this interface in three metal-reinforced glass ionomers. Two of them were commercial, ESPE-Ketac Silver (KS) and GC-Miracle Mix (MM), and the third, EX, was experimental.

Dental neglect: definition and prevention in the Louisiana Developmental Centers for patients with MRDD.

When dental services and appropriate use of restraints are used for persons who are severely and profoundly mentally retarded and developmentally disabled (MRDD), oral health is enhanced and dental neglect is controlled or even reduced. This paper defines dental neglect and examines the consequences to persons who are MRDD when appropriate restraints and preventive dental home care are not used. Oral health outcome assessment data of this MRDD population indicate the presence or absence of dental neglect.

Dental treatment guidelines for use of restraints within the nine Louisiana developmental centers. Louisiana State University Dental Health Resources Program.

There are approximatively 2000 mentally retarded or developmentally disabled (MR/DD) individuals in Louisiana's nine developmental centers (LDC). Two-thirds resist the delivery of preventive and clinical dental services. Therefore, for these patients to receive quality, comprehensive dental care, some form of restraint is necessary.

Differential diagnosis of pericoronal radiolucencies with and without radiopacities.

Pericoronal radiolucencies, by definition, surround the crown of a tooth. They are encountered not only in pediatric patients but also in adults of all ages. It is likely that all clinicians, at some time or another, will be confronted with a radiograph showing a pericoronal radiolucent lesion.

Everything you wanted to know about radiographic duplication.

If dental radiographs are not duplicated correctly, the resulting duplicates will be of inferior quality. This article discusses the characteristics of a duplicating film, the principle of radiographic duplication, a description of dental duplicators, the selection of optimum duplicating time, a technique of duplicating radiographs, an alternate technique of duplicating radiographs, errors in duplication and their correction, and the maintenance of duplicators.

The effect of different membranes on onlay bone graft success in the dog mandible.

Objective: The aim of this study was to compare resorbable membranes, nonresorbable membranes, and no coverage with respect to onlay bone graft healing in a dog.

Experimental Design: Each of four dogs had six corticocancellous blocks of ramus bone placed bilaterally as onlay grafts to the inferior lateral aspect of the mandible. On each side, one graft was left uncovered, one was covered with a collagen membrane, and one was covered with an expanded polytetrafluoroethylene membrane.

An alternative technique for mandibular advancement prosthesis fabrication.

One of the conservative and successful modalities of treatment for obstructive sleep apnea is the mandibular advancement prosthesis. This prosthesis engages teeth on both dental arches for retention and stability. This article describes a technique that allows the fabrication of such a prosthesis in one piece and in a single laboratory step.

Bone maintenance 5 to 10 years after sinus grafting.

Purpose: This radiographic study determined the amount of bone around hydroxyapatite (HA)-coated dental implants that were placed into bone-grafted maxillary sinuses.

Patients And Methods: Postoperative complex motion tomograms using the Grossman technique were taken on 16 patients who had 27 maxillary sinus grafts performed using particulate autogenous iliac bone with and without demineralized bone, autogenous iliac corticocancellous block with and without demineralized bone, and autogenous jaw bone with demineralized bone. Bone levels were measured from the new floor of the grafted sinus to the apex of the implant and to the alveolar crest.

An experimental study of mandibular arch widening in the dog using distraction osteogenesis.

Purpose: This study evaluated the amount of skeletal and dental widening of the mandible in the dog produced by using a tooth-borne distraction device.

Materials And Methods: Four adult mongrel dogs had osteotomies performed in the parasymphysis region and had a tooth-borne distraction appliance placed to widen the mandible 10 mm. The interarch distance between the canines and between the fourth premolar teeth, as well as between the intrabony markers, was compared.

Skeletal and dental movements after anterior maxillary advancement using implant-supported distraction osteogenesis in dogs.

Purpose: This study evaluated skeletal and dental relapse in the dog after anterior maxillary advancement using an implant-anchored distraction osteogenesis device.

Materials And Methods: After the placement of implants into the palate, four dogs had a skeletally anchored distraction device fabricated and an anterior maxillary osteotomy performed. The distraction device was activated 0.

Sinus augmentation for dental implants: the use of autogenous bone.

Autogenous bone has been the material of choice at our institution since 1983. The criteria for a successful graft in the sinus have been fulfilled based on functional stability in patients followed-up over 10 years in selected cases. Of 173 implants placed into autogenous bone grafted sinuses, 20 have been lost in four patients.

Functional versus aesthetic articulation of maxillary anterior restorations.

The correct orientation of the master model is a frequently overlooked aspect of communication between the clinician and the ceramist. The master model must provide the ceramist with the same perspective of the patient as is seen by the clinician--facing the viewer. Unless precise information is transferred to the laboratory, the ceramist can only estimate horizontal and vertical alignment of the working cast from landmarks taken from the cast itself.

Phenobarbital-induced gingival overgrowth? Report of two cases and complications in management.

Gingival overgrowth is a known side effect of several seizure, immunosuppressant and calcium channel-blocker medications. Gingival overgrowth is not a reported side-effect of phenobarbital. This case report describes two patients with marked gingival overgrowth who had been medicated with phenobarbital exclusively since the initiation of seizure disorders.

Temporomandibular joint range of motion: a ratio of interincisal opening to excursive movement in a healthy population.

Range of motion is used in the examination and diagnosis of many joints. A simple method to measure and record temporomandibular joint range of motion is presented. Correlation of mandibular movement to excursive or lateral movements for a healthy population is described.

Masticatory tooth contact patterns: cuspid and first molar contacts during mastication of three types of food.

In ten healthy subjects, bilateral contacts between opposing cuspid and first molar teeth were recorded during one sequence of unilateral chewing of apple, peanuts, and banana. Unknown magnitudes of mechanophysical (masticatory) forces were inferred to act directly on the chewing-side cuspid teeth in 71% of all masticatory cycles and on the nonchewing-side cuspid teeth in 68% of all masticatory cycles. In addition, unknown magnitudes of mechanophysical forces were inferred to act directly on the chewing-side first molar teeth in 74% of all masticatory cycles and on the nonchewing-side first molar teeth in 86% of all masticatory cycles.