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At least 721 records · Page 40Linked to original sources
PubMed2000

Achieving ultimate anterior esthetics with a new microhybrid composite.

Direct bonding is one of the most commonly used forms of restoration for the conservative esthetic improvement of anterior teeth. The major challenges involve selecting composites that have adequate strength as well as provide lifelike optical properties that render the restoration functionally sound and esthetically pleasing. Properties such as high sculptability, wide shade range, varying opacities and translucency, as well as high polishability are essential for gaining absolute control over the restorative process and the attainment of natural-looking results. This article discusses a new composite restorative system and its application in the direct esthetic and functional rehabilitation of the anterior dentition.

Adult↗
PubMed1999

Clinical experience with PYRAMID stratified aggregate restorative and the VIP unit.

The shrinkage of composites induces stress in the final restoration when the composite is bonded to the tooth surface. The amount of stress can be controlled by the method of pulse-delay cure used. The development of new composites has changed the energy requirements for obtaining polymerization. The total energy required for optimal polymerization has been reduced, and the rate at which the energy is delivered can have a strong effect on the final properties of the restoration. Newer composites may employ different photoinitiators, making the spectral emission from the curing light an important factor for properties of the final restoration. It is proposed that labels for composites carry: (1) indications for the total energy required; (2) specification of the pulse-delay cure if applicable; and (3) the required spectral bandwidth of the curing lamp light emission.

Composite Resins↗
PubMed2001

The evolution of a chairside CAD/CAM system for dental restorations.

Since its introduction more than 15 years ago, the CEREC method for the chairside fabrication of all-ceramic restorations has steadily earned a loyal following among dentists. The rapid creation of tooth-colored restorations, including full-coverage crowns, at chairside has been achieved through quick and easy optical impression-taking, simple designing, and precise machining. This article describes the evolution of this technology's development and its incorporation into the dental practice.

Ceramics↗
PubMed2002

Effect of cyclical lateral forces on microleakage in cervical resin composite restorations.

OBJECTIVE: The aim of this study was to assess the effect on microleakage of cyclic lateral fatigue forces in different types of cervical resin composite restorations. METHOD AND MATERIALS: V-notch cavities were prepared at the cementoenamel junction in 60 extracted human premolars and restored with a bonding system along with one of the following resin composites: hybrid resin composite, microfilled resin composite, and flowable resin composite (20 each). Ten specimens from each group of 20 were subjected to 8,400 cycles of lateral fatigue forces (44 N) at the occlusal half of the clinical crown in a machine specifically developed for this purpose. The other 10 specimens of each group served as controls, representing the microleakage that occurred without lateral fatigue forces. All specimens were stained with a 50% silver nitrate solution and sectioned sagittally. A scoring system of 0 to 6 was used to record the amount of die penetration along the restoration-tooth interface. RESULTS: There was leakage in both the fatigued specimens and the nonfatigued control specimens. There were significant differences in the mean values of microleakage for the restorative materials studied. In the nonfatigued groups, hybrid resin specimens exhibited significantly more microleakage at the dentin-resin interface than did microfilled or flowable resin specimens. In the fatigued groups, hybrid resin specimens exhibited significantly more leakage at the dentin-resin interface than did microfilled resin specimens. CONCLUSION: The least elastic resin composite tested, the hybrid material, generally showed the most leakage. This suggests that the elasticity of these resin composite restorative materials may be a factor in the amount of microleakage in cervical restorations.

Barium Compounds↗
PubMed1996

[Mechanisms and theory of occlusal wear].

The various mechanisms which cause wear of occlusal surfaces of the teeth, erosion as caused by the food, direct contact wear, and surface fatigue are discussed from their theoretical bases. Special attention is paid to the implications for the oral environment. The ACTA wear machine, designed to simulate these mechanisms, as well as some of its results, are briefly discussed.

Dental Materials↗
PubMed1997

[Amalgam use and mercury emission in the Netherlands].

An overview is presented of the emission of mercury to the environment by restoring teeth with amalgam, extraction, replacement of amalgam, and the final phase of teeth. Important input data were the trade figures of amalgam. The emission of mercury from amalgam fillings are characterized by diffuse spreading. Many small sources are together a substantial source of the leakage of mercury to the environment. Amalgam adhering to cotton-wool and in extracted teeth deliver a relevant contribution to the mercury load in municipal waste. The total mercury emission from dental amalgam to the environment in the Netherlands is at the estimate 500 kg a year, with a worst case maximum of 935 kg.

Dental Amalgam↗
PubMed2002

Survey of undergraduate esthetic courses in U.S. and Canadian dental schools.

U.S. and Canadian dental schools were surveyed regarding curriculum issues related to undergraduate dental esthetic restorative courses. A one-page survey instrument was sent to deans of academic affairs (n=59) of dental schools to complete or forward to the most appropriate faculty at their respective schools who would be knowledgeable about the esthetic restorative curriculum. Responses were received from forty-two dental schools (42/59) for a response rate of 72.9 percent. The first part of the survey asked if a specific esthetic restorative course was offered at their school, if it was mandatory or elective, and details of the course length and content. The second part of the survey asked whether selected esthetic restorative procedures were included in the curriculum. Respondents to this survey indicated that most types of esthetic restorative procedures are taught whether or not an esthetic course is included in the curriculum.

Canada↗
PubMed1999

[Oro-dental treatments in the child under general anesthesia (apropos of an initial case)].

Oro-dental treatments under General Anesthesia (G.A.) depend on precise indications and the expected results in some cases in Pediatric Dentistry. In this report we have an indication case of oro-dental treatment under G.A. That clinical case has allowed us to record the difficulties that we face in Dakar in order to realize effectively that technics. That case has also allowed us to ascertain the necessity to integrate that practice in the training board in Pediatric Dentistry. Actually, the clinical indications of oro-dental treatments under G.A. are more and more numerous, and in some cases, the dentist intervention becomes a necessity. Moreover, the technics of intervention under G.A. for some patients is the more indicated technics to reach the expected objectives.

Anesthesia, Inhalation↗
PubMedDate not supplied

Avoiding failures during insertion of all-ceramic restorations.

The seating, cementing, and finishing of all-ceramic restorations can be a very demanding operation. All steps must be accomplished well in order to produce a clinically acceptable result. Successful placement of all-ceramic restorations can result in an immediate reward for both the patient and the operator; however, only with very careful consideration of occlusion, laboratory work, and chairside seating and finishing can a successful long-term result be realized.

Cementation↗
PubMedDate not supplied

Fracture strength of amalgam crowns with repaired endodontic access.

Endodontic therapy is accessed occlusally in posterior teeth, many of which have large, pre-existing amalgam restorations. These teeth are also commonly restored with an occlusal amalgam to repair the access opening. This study determined the fracture resistance of complex amalgam restorations that have repaired endodontic access compared with original, unrepaired, complex amalgams on endodontically-treated teeth. Two groups of 30 molars were used in the study. The first group was decoronated and received an endodontic access preparation. These teeth were restored using chamber retention and four TMS pins. The second group was decoronated and restored using pin retention. Later, they received an endodontic access through the restoration. The access was then repaired with amalgam. The samples were loaded in an Instron Universal Testing Machine until failure. The Group 1 samples failed at a mean force of 2297.5 N. The mean failure load for the samples in Group 2 was 1586.1 N. Student's t-test found this difference to be statistically significant. Endodontic access through an amalgam crown significantly compromises the fracture strength of the original restoration.

Dental Alloys↗
PubMedDate not supplied

The effect of resin composite pins on the retention of class IV restorations.

Standardized Class IV cavity preparations were made in 48 human incisors. They were then divided into three groups of 16 teeth each. Group 1 was prepared with no internal retentive features. Groups 2 and 3 included an internal pin channel prepared with a #330 and a #329 bur, respectively. All specimens were restored with a micro-hybrid resin-based composite restorative material and a fifth generation dentin bonding system. Specimens were loaded to failure in an Instron Universal Testing Machine perpendicular to the long axis of the teeth. There was no evidence to suggest a difference in force required to dislodge the restoration among the three groups tested (p=0.185). Resin composite pins do not increase the retention of Class IV resin composite restorations.

Acid Etching, Dental↗
PubMed2001

Support of undermined occlusal enamel provided by restorative materials.

OBJECTIVE: The purpose of this study was to test the support of occlusal enamel by amalgam (Dispersalloy), bonded amalgam (AmalgamBond Plus adhesive system with high-performance additive powder and Dispersalloy amalgam), and a bonded resin composite (Scotchbond Multi-Purpose adhesive system and Z100 resin composite). METHOD AND MATERIALS: For each material, 16 human molars were prepared. The lingual cusps were removed, and the dentin supporting the facial cusps was cut away, leaving a shell of enamel. Each group of prepared teeth was restored using the materials according to manufacturers' instructions. All specimens were thermocycled (1,500 cycles, 6 degrees C to 60 degrees C, dwell time 30 seconds), then mounted vertically in cast stone. A separating disk, mounted horizontally, was used to create a flat horizontal surface approximately 1.5 mm wide at the tips of both remaining enamel cusps of each specimen. Specimens were loaded evenly across the cusp tips at a crosshead speed of 10 mm/min until the fracture occurred. RESULTS: Data were analyzed using analysis of variance and Tukey A post hoc analysis. No significant difference was detected among amalgam, bonded amalgam, and bonded resin composite in their ability to support occlusal enamel. Support provided for occlusal enamel by the materials, whether bonded or not, was intermediate between no support and that provided by dentin. CONCLUSION: Without further development of materials technology and evidence of efficacy, restorative materials should not be relied upon to support undermined occlusal enamel.

Analysis of Variance↗
PubMed2001

Fracture toughness of posterior resin composites.

OBJECTIVES: The purpose of this study was to evaluate and compare the resistance to crack propagation, as measured by the fracture toughness, of some packable posterior resin composites with other posterior resin composite materials. METHOD AND MATERIALS: Fracture toughness determinations were made for the 5 packable and the other posterior resin composites using 3-point flexure of beams with a standardized central single-edge notch. Ten beams of each material were tested on an Instron test machine. The maximum loads were determined, from which the fracture toughness values (KIC) were calculated. The data were analyzed statistically using ANOVA and t tests. RESULTS: The resin composites tested demonstrated a range of KIC values. The materials were separated according to the mean KIC values into 5 groups that were statistically different. While 2 packable resin composites had KIC values that were among the highest, the other packables were substantially lower than nonpackables. The intermediate value group consisted of 3 of the conventional posterior resin composites. CONCLUSION: There was a very weak correlation between fracture toughness and reported volume concentration of particulate reinforcing elements. The posterior resin composites tested exhibited a spectrum of KIC values. The packable resin composites were distributed along this spectrum, with 2 products exhibiting high potential for resistance to crack propagation.

Acrylic Resins↗
PubMedDate not supplied

[Advances and limits in biomedical stress quantification in dento-periodontal structures].

The stress quantification in dento-periodontal structures is an important concept, as stress in the tissue and in surrounding structures. A number of clinical studies have suggested figures for such an optimal stress strange. The clinical experiments can be completed with mathematical analysing methods as finite element method. Once the basics of biomechanics understood laws the treatment goes clearly defined, the computer aided design improve the optimal restorative prosthetic or orthodontic appliance. The finite element method (FEM) makes possible the numerical simulation of different clinical situations. Based upon mathematical modelling and extrapolation from experimental studies, practical conclusions can be drawn concerning the different types of forces and their subsequent induced relationship to the stresses. Clinical and histological experiments confirm the mathematical prediction offered by the FEM.

Compressive Strength↗
PubMedDate not supplied

Interdisciplinary treatment for esthetic restorative dentistry.

Many of our patients have dental needs that general dentists cannot satisfy and may not even know about. Using an interdisciplinary team will expand the knowledge of all of the team members and can only enhance the restorative result, including function, long-term prognosis, and esthetics. Suggestions have been offered to help develop these teams, which may include general dentists, periodontists, orthodontists, oral surgeons, and endodontists. Team members are chosen based on individual skills needed for a particular case but all must be able to motivate and educate patients while providing excellent dentistry.

Adolescent↗