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At least 685 records · Page 38Linked to original sources
PubMed2000

Cumulative effects of successive restorative procedures on anterior crown flexure: intact versus veneered incisors.

OBJECTIVE: When successive restorative procedures (e.g., porcelain veneers, interdental resin composite restorations, and endodontic treatment) are carried out on the same tooth, significant effects on crown flexure can be expected. METHOD AND MATERIALS: Dentin-bonded porcelain veneers (experimental group) were assessed in vitro using functional and cyclic thermal loads. They were compared to natural teeth (control group) with respect to 2 parameters: coronal flexure (investigated using experimental strain gauges) and morphology of the tooth-restoration interface (scanning electron microscopic evaluation). For both veneered and natural teeth, crown deformation was recorded at 5 sequential experimental steps: intact tooth (baseline), Class III cavities, Class III resin composite restorations, endodontic treatment, and endodontic restoration (without posts). RESULTS: No significant differences in crown flexure were found between natural and veneered incisors when compared across experimental steps. The main effect for experimental steps was highly significant. When averaged across all specimens (natural and veneered teeth), the endodontic treatment step resulted in the highest crown flexure (1.55x the baseline value). The unrestored Class III cavities and the endodontic restoration were next highest (1.30x and 1.28x the baseline value, respectively). The lowest crown flexures were found after restoration of the Class III cavities (1.13x the baseline value). No measurable microleakage or gaps were detected at the ceramic-resin, resin-enamel, or resin-dentin interfaces (Optibond FL, Kerr). CONCLUSION: Each subsequent reduction in tooth structure resulted in a substantial increase in crown flexibility, even after restoration. Endodontic procedures were responsible for most of the loss in crown stiffness. Extensive proximal cutting and restorations seemed to minimally affect crown flexure. Porcelain veneers showed perfect biomimetic behavior, because cumulated restoration procedures had the same effect on natural and veneered incisors.

Analysis of Variance↗
PubMedDate not supplied

The Cerec 3--a quantum leap for computer-aided restorations: initial clinical results.

The Cerec 3 system simplifies and accelerates the fabrication of ceramic inlays, onlays, veneers, and quarter, half, and complete crowns for anterior and posterior teeth. Cerec 3 software simplifies occlusal and functional registration. Proper occlusion is established accurately and quickly; manual adjustment is reduced to a minimum. The separate grinding device, working true to morphologic detail and with fine surface quality, is connected to the optical unit by radio control. Equipped with a laser scanner, it can also be used for indirect application through a standard personal computer. The Cerec 3 system is network and multimedia ready and, in combination with an intraoral color videocamera or a digital radiography unit, can be used for patient education and for user training. The Cerec 3 system thus is a diagnostic, restorative, training, and documentation center for the dental practice.

Adult↗
PubMed2000

The facilitating role of mobile dental van programs in promoting professional dental education.

The main goal of the University of Texas Health Science Center (UTHSCSA) dental van programs is to provide training in delivering care to diverse segments of the population. The UTHSCSA is the Academic Health Center for all of South Texas, a region with 25% of the State's population and 60% Hispanic. About 60% of the region's counties are federally designated dental health personnel shortage areas. Interdepartmental efforts with the participation of dental hygiene, community dentistry, oral diagnosis, periodontics and general practice carried out two programs during the 1994-95 academic year. At the Saint Philip of Jesus Clinic, a charity clinic, and at the Willows Development Center for Severely and Profoundly Mentally Retarded, the dental van was used to provide preventive and restorative care. A questionnaire to measure the value of the programs indicated that students perceived them as important educational activities which increased their confidence in treating persons in the community, especially persons with disabilities. Program output was quantitatively assessed. An average of 8 preventive procedures, 7 fillings, 2 sealants and 1 extraction or referral were provided each working day. Eighty patients were seen at the Saint Philip Clinic (2.5 visits per patient) and 130 patients were seen at the Willows Development Center. Overall, 80 students and 6 faculty participated in providing screening, treatment and referral services. Dental van programs promote access to dental care and increase the visibility of dental schools within the university and community. Current tendencies to halt new program initiatives and phase out existing programs due to shifting financial priorities should be carefully considered in view of the 1995 Institute of Medicine (IOM) report on the future of dental education.

Attitude↗
PubMed2001

Shades of a color. Illusion or reality?

Attaining the highest clinical level in esthetic and cosmetic dentistry necessitates the development of artistic skills; of balancing illusion with reality. The shade of a tooth is a combination of color and light and varies in different light conditions. Understanding the differences in color shades is the basis to creating illusions. Understanding light and color, and the reality of illusions, allows the clinician to design and sculpt a smile, to modify a flawed display artistically so that patients may perceive it as natural and more attractive, and to design laminates and veneers, class III, class IV, and cervical cavities.

Color↗
PubMed2000

A simple method to protect patient and environment when using sandblasting for intraoral repair.

Repair or correction of intraoral restorations can be an alternative to complete replacement. A simple sandblasting device is very effective in producing a microretentive surface on every restorative material. A disadvantage of the technique is the production of an aerosol contaminated with the small, abrasive aluminum-oxide particles. In this article, a simple solution is given to protect the patient and environment against this dust during intraoral reparatory procedures involving sandblasting.

Adult↗
PubMedDate not supplied

Shade selection and value control.

The purpose of this article is to describe, in general terms, the variables that may influence the accurate assessment of shade selection prior to the fabrication of a ceramic restoration, and to outline a specific procedure for "shade selection," to determine the appropriate porcelain powders used in recreating the desired optical properties of the natural dentition. Special attention is dedicated to the control of the 'value' level, which is of paramount importance in achieving a vital, life-like appearance that is in harmony with surrounding dentition. By controlling and maintaining one light source, we can eliminate at least one variable in the shade taking process. By identifying the location of the individual components utilized to re-create natural dentition, one may render greater overall accuracy in shade reproduction. Understanding the limitations of standard shade guides, and increasing color communication with the use of custom shade guides has distinct advantages for achieving desired shades.

Ceramics↗
PubMed2001

Smile analysis and face-bow transfer: enhancing aesthetic restorative treatment.

The objective of current aesthetic dental treatments are to enhance the patient's smile by improving the overall dental appearance. A detailed analysis of the patient's face as it relates to the three-dimensional position, shape, and color of the teeth is required to improve this appearance. A full frontal and lateral evaluation of the patient's facial form is required to successfully complete on aesthetic smile evaluation. Additional considerations include cephalometry and a thorough dental analysis. This article demonstrates a comprehensive smile analysis technique and its communication to the dental technician.

Adult↗
PubMed2000

[A clinical study of composite restorations in anterior teeth using the Ryge criteria. Apropos of 120 cases performed at the University Hospital Center in Dakar].

In this two years retrospective study the authors determined the rate of survival composite restorations and evaluated clinically the remaining restorations by the Public Health Service (P.H.S.) criteria of Ryge. These restorations were performed by students using Heliomolar composite with scotchbond 2 adhesive dentin system. Results have shown that after two years, 98 (81.67%) out of 120 restorations were present and 51.2% were still working. Clinical evaluation of the remaining restorations needed replacement mainly because of severe color mismatch. Anatomic form and marginal adaptation were well scored after two years (score Alpha or Bravo). This study has shown that composite material is a valuable and effective technology for conservative treatment of anterior teeth in Senegal to avoid tooth extractions and prosthetic. However the knowledge about the type of composite material used must be improved and the operative procedures should be more controlled.

Acrylic Resins↗
PubMed2000

[Adhesive techniques in the treatment of tooth wear due to bruxism].

Wear due to bruxism is not restricted to those surfaces of the tooth that are loaded by occlusion and articulation. Due to tooth flexure wedge-shaped lesions, so-called abfractions, may develop. In the treatment of wear caused by bruxism, direct composite restorations may play an important role. Composite resin can be used to cover exposed dentin and to restore the incisor and canine guidance. In combination with a nightguard, such a treatment may prevent further wear.

Bruxism↗
PubMed2001

Restoration of enamel and dentin erosion due to gastroesophageal reflux disease: a case report.

Gastroesophageal reflux disease (GERD) is a condition where acid contents of the stomach are regurgitated into the oral cavity, which results in continual exposure of the teeth to these acids. Knowledge of the relationship between GERD and dental erosion enables the appropriate diagnosis and treatment of the underlying medical condition as well as the affected teeth. This article details a case report where severe dental erosion was present due to GERD. After management of the disease, treatment (i.e., diagnosis, treatment planning, and restoration) of the eroded dentition is described.

Adult↗
PubMed2001

The choice is ours.

Explore the source record for details and available documents.

Aluminum Silicates↗
PubMedDate not supplied

Buonocore memorial lecture. Adhesive dentistry applied to the treatment of traumatic dental injuries.

Dental adhesive techniques have led to a significant simplification of the immediate and definitive treatment of traumatic dental injuries. Composite restoration of fractured teeth, bonding of tooth fragments, the use of laminate veneers or porcelain onlays and resin retained bridges are some of the ways adhesive techniques are used to treat fractured teeth. Furthermore, splinting of luxated teeth almost entirely relies on the combination of adhesion and a flexible resin which simulates the mobility of a normal periodontal ligament during the healing period. The internal strengthening of immature root-filled teeth with composite using an adhesive technique may possibly prevent late root fractures caused by weakening of the tooth structure resulting from endodontic procedures. Finally, the adhesive principle using a retro-seal with composite after apicoectomy significantly increases the healing rate and healing mode.

Apicoectomy↗