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At least 631 records · Page 35Linked to original sources
PubMed2005

[The effects of desensitizing bonding system for prevention of vital abutment hypersensitivity].

OBJECTIVE: To evaluate the effects of GLUMA desensitizing bonding system in desensitizing hypersensitivity of vital abutment. METHODS: 69 central incisors with vital pulp from 69 patients were randomly divided into A, B and C group. After tooth preparation, group A coated with primer after etching, group B coated with primer after etching cervical dentin only, and group C was control group without special treatment. The cold sensitivity of abutments was tested after coating with primer, after cementation of crown and three months later. Two fresh extracted caries and restoration-free middle incisor were prepared in routine way. The surface of specimen 1 was etched with conditioner and the control specimen 2 was prepared without any special surface treatment. Scanning electron microscope (SEM) observation was used to examine the details on dentin surface. RESULTS: In all three times of examination, the sensitivities of two experimental groups had been significantly reduced compared with the control group. Immediately after coating, group B were more sensitive than group A (P < 0.05). After cementation of crown and three months later, there was no statistically significant between group A and group B. SEM photomicrograph showed that the smear layer was removed from etched dentine surface with open dentinal tubules. CONCLUSION: Coating with GLUMA desensitizing bonding system could prevent hypersensitivity of vital abutment.

Acid Etching, Dental↗
PubMed1991

[Effect of rotary instruments on composites for coronal restoration. A proposed evaluation protocol for the effect of rotary instruments and surface conditions].

Numerous core composites are used to reconstruct abutments for fixed partial dentures. The preparation is carried out with various type of burs. The purpose of this study is to facilitate the choice among them. Six chemical composites, one glass ionomer cement and two light cured composites have been selected. Calibrated samples have been made, divided into four series and prepared with six different burs used for fixed partial dentures, three of them as finishing burs. In the first part of the investigation, the samples were examined with a S.E.M., in order to visualize the surface texture. According to the materials used, variations may exist. In the second part of the investigation, a tridimensional study was performed using a mechanical scanner microscope which permitted the quantification of some roughness characteristics, thus, an objective comparison of the surfaces became possible. Due to the complementary nature of the two investigation techniques, a protocol is presented for the study of burs instrumentation and prepared tooth surface.

Carbon↗
PubMed2006

Replacement of missing posterior teeth with an all-ceramic inlay-retained fixed partial denture: a case report.

Adhesively luted all-ceramic inlay-retained fixed partial dentures can be a clinical alternative for the replacement of missing posterior teeth in certain situations. This type of restoration allows satisfactory esthetics and reduced tooth preparation compared to a conventional metal-ceramic fixed restoration. This case report describes the use of an inlay-retained fixed partial denture as a conservative alternative for the replacement of missing posterior teeth.

Adult↗
PubMedDate not supplied

Soft tissue management for difficult cervical restorations.

This article offers a rationale for choosing methods of isolation and soft tissue management that will result in the best possible operating conditions for treating cervical dental lesions. A surgical technique used in conjunction with rubber dam isolation is described for those Class V lesions that cannot be managed effectively in a routine manner.

Dental Restoration, Permanent↗
PubMed2006

Composite resins and bonded porcelain: the postamalgam era?

The growing demand of patients for esthetic or metal-free restorations, together with the ongoing interest of the dental profession for tissue-preserving materials have led to the actual development of posterior adhesive restorations. It is now clearly established that a new biomimetic approach to restorative dentistry is possible through the structured use of "tooth-like" restorative materials (composite resins and porcelain) and the generation of a hard tissue bond (enamel and dentin bonding). Scientific studies and clinical experience have validated use of bonded tooth-colored restorations, and we may have entered the so-called "postamalgam era". These significant changes have already impacted daily general practice, including pediatric dentists in California, but it is now critical to assure that the corresponding evidence-based process is integrated to the predoctoral programs statewide and nationwide. This paper reviews the foundations of this evolution, based on maximum tissue preservation and sound biomechanics, the so-called "biomimetic principle". Using scientific evidence and clinical experience, a model for the adequate use of current restorative systems is presented. This work, illustrated with cases with up to 10 and 14 years' follow-up, sets the ground rules for the clinical performance of the posterior esthetic restoration. Important considerations about tooth preparation, matrix techniques, layering methods, immediate dentin sealing and base lining are presented.

Advisory Committees↗
PubMed2006

[Application of functionally generated path technique in computer-aided-design modeling of occlusal surface of full crown].

OBJECTIVE: To apply the functionally generated path (FGP) technique for modeling the occlusal surface of a computer-aided-design (CAD) posterior full crown to obtain anatomic morphology. METHODS: A patient with defected left mandibular first molar was employed. After tooth preparation and impression making, the gypsum working cast and die were scanned with a digitized mechanical scanner and the surface data was acquired. The interocclusal records at intercuspal position (ICP) and FGP were made in the patient's mouth. These records were placed on the working cast and their surfaces were scanned. In the process of the computer-aided designing full crown, the cusps and fossae of the occlusal surfaces were accurately modified according to the digitized information of ICP and FGP interocclusal records. RESULTS: A full crown was designed and the occlusal morphology of the restoration was adapted to dynamic occlusion as well as static occlusion. CONCLUSIONS: The FGP technique was practical for the CAD of full crown and could avoid potential occlusal interferences with opposing teeth during function.

Adult↗
PubMed2006

Press-to-zirconia: a case study utilizing cad/cam technology and the wax injection method.

Computer technology is increasingly becoming an effective tool in restorative dentistry. Whether chairside or laboratory-fabricated, computer-aided design/ computer-aided manufacturing (CAD/CAM) engineering has become widely accepted in the fabrication of dental restorations. Zirconia has been successfully used in medical therapy and is now considered a viable alternative to metal as a substrate in single- and multiple-unit fixed restorations. Proper tooth preparation and handling of this material is essential for a successful outcome. This presentation will discuss how CAD/CAM systems can utilize zirconia frameworks to provide treatment of a maxillary anterior restoration.

Computer-Aided Design↗
PubMed1991

Overlay bit restorer as a Phase 1 orthotic.

Phase 1 (reversible) orthotic therapy is often complicated by missing teeth or the fragile nature of the materials used to construct appliances that must function under the pressures of mastication. The bite restorer combines the strength of Vitallium with the occlusal acceptability of Anodyne to produce an esthetic and functional orthotic without the ill effects of cast metallic overlays. The author uses his experience as a certified dental technician to discuss arch and tooth preparation, clasping, and proper impression technique.

Dental Occlusion↗
PubMed1991

[Rehabilitation of partially edentulous cases with telescope crowns: modified, fully veneered tapered crowns].

Telescope crowns are well established as prosthodontic retainers for removable partial dentures. After a short review of the advantages and disadvantages of telescope crowns, the specifies of tapered crowns are described. By the use of appropriate tooth preparation and the fabrication of modified, fully resin-veneered tapered crowns, it is possible to improve on the crown contours and the aesthetics provided by conventional tapered crowns. Periodontal prophylactic conditions are also considered.

Aged↗
PubMed1991

[Rationale for fabrication of combination dentures].

The complexity of this type of restoration comes from the numerous clinical and laboratory steps required. Achievement of these prosthodontic restoration is based on a careful clinical examination, models mounted on an articulator, in centered relation and adequate vertical dimension. The models allow the surveyor examination, the teeth set up and/or wax up. Duplication of the teeth set up in acrylic will reduce the number of patient's appointments, and thus, the potential errors will be minimized. This acrylic teeth set up (A.T.S.) will allow: to keep the decided occlusal relationships; to visualize the teeth grinding to be made; to guide the tooth preparation; to take the abutment impression, in occlusion. Therefore: the final model; the vertical dimension; occlusal relationship; the aesthetic; and, the removable partial denture design will be available for the dental technician. Furthermore, in close to full denture cases (class I and large class IV), the A.T.S. can be used to take the impression, to achieve the framework, and to transfer the occlusal registration.

Dental Impression Technique↗
PubMed1991

Indirect inhibition of polymerization of a polyvinyl siloxane impression material: a case report.

The inhibition of polymerization of polyvinyl siloxane impression materials by direct contact with latex gloves has been well documented. Indirect intraoral inhibition of polymerization that results from contact of oral tissues with latex gloves during tooth preparation and gingival retraction procedures has been reported. This case report illustrates the problems that can occur when the dentist used polyvinyl siloxane impression materials while wearing latex gloves. In the reported case, the inhibition is severe and obvious; in most situations the inhibition of polymerization is more subtle and is frequently undetected. Clinicians must be aware of this potential problem and the solution to it.

Dental Impression Materials↗
PubMedDate not supplied

Electromyography: its potential as an adjunct to other monitored parameters during conscious sedation in children receiving dental treatment.

The purpose of this study was to evaluate the effect of a combination of a low dose of chloral hydrate and hydroxyzine on the frontalis muscle electromyogram in addition to other physiologic parameters in pediatric dental patients. A double blind, two-appointment cross-over design was used. Either a placebo or a combination of chloral hydrate and hydroxyzine was given to children during the first visit with the sequence of placebo/drug conditions being randomly determined. During the second visit, the children received that agent not given during the first visit. Baseline physiologic data was obtained at the beginning of each visit and the physiologic measures were again recorded during topical and local anesthesia administration, high-speed tooth preparation, and at the end of the dental appointment. The results indicated that the frontalis muscle activity and cardiovascular parameters were significantly affected by the drug and dental procedures. Oxygen saturation was least affected. The frontalis muscle appears to be a sensitive physiologic parameter to monitor during conscious sedation as an index of the amount of patient relaxation.

Blood Pressure↗
PubMed1990

Relationship between critical convergence angle and surface defects in stone casts.

Surface defects on stone casts threaten the accuracy of cast restorations. The aim of this study was to examine the relationship between critical convergence angle and voids in stone casts. Three addition silicone materials, one condensation silicone material, and one polyether impression material were used. The highest convergence angle at which voids presented at the tip of the specimens was recorded, and the number of voids found at margins and line angles of the tooth preparations were counted. Results showed a positive and significant correlation between the critical convergence angle and the number of voids at margins and line angles of stone casts. Casts poured from polyether impressions registered significantly lower critical convergence angle values and presented with fewer voids than did those fabricated from silicone materials.

Calcium Sulfate↗
PubMed1990

Operating illumination to differentiate dental hard tissues.

This in vitro study was designed to evaluate the ability of fluorescent tubes and dental lights to help operators distinguish tissues (fissures), differentiate between tissues (at the dentinoenamel junction or between carious and sound dentin), and distinguish form of a tooth preparation (Class II and Class V cavities). Operators with "normal" color vision ranked the lights in order of preference for each type of specimen. In general, for the fluorescent illuminants, operators preferred lights with high color temperature values and high color rendering index values. A small group of color-blind observers indicated a preference for an illuminant of low color temperature and low color rendering index value. For dental lights, operators preferred a higher color temperature for examining fissures, the dentinoenamel junction, and the cavity preparation. No particular illuminant was preferred for distinguishing between carious and sound dentin. Many observers had difficulty in choosing a preferred dental luminaire.

Color↗
PubMed1990

[Characterizing the smear layer].

The smear layer was first described as a debris layer which is left on all cavity walls following tooth preparation. It is composed of an outer contiguous layer of amorphous instrumentation matrix which covers all cavity walls, and a deeper zone of matrix plugs which obturate the cut tubules. Recent scanning electron microscopic (SEM) studies have characterized the smear layer as mineralized collagen fibers appearing as globules dispersed within an amorphous cutting matrix. Removal of smear plugs increases the outward hydraulic conductance (Lp) of dentinal fluid flow which may lead to dentinal hyperalgesia, bacterial infection and pulp pathosis if left untreated.

Collagen↗
PubMed1990

[Adhesive cast restorations].

The aim of this article is to present the clinical use of the adhesive cast restoration in the treatment of the advanced perio case in an effort to overcome the serious restorative problems related to those cases. The use of the adhesive cast restoration in the advanced periodontal conditions has proved that it can be considered a permanent restoration. The main advantages in the use of the adhesive cast restoration are: i) Minimal tooth preparation, which eliminates the possibility of pulpal contamination. In fact, pulpal integrity is of crucial importance in the advanced perio case because of the close interrelationship between the pulp tissue and periodontal structures. ii) Supragingival lingual margins, which do not compromise the patient's esthetics and permit for good plaque control. iii) Reversibility of the restoration. iv) Reduced cost, which helps the clinician to use teeth with guarded prognosis from a periodontal point of view.

Costs and Cost Analysis↗
PubMed1990

Preventive restorative dentistry.

Greater use of conservative tooth restorations is advocated to encourage optimum tooth strength and restoration longevity. Improvements in tooth preparation instruments, and restorative materials, accompanied by use of magnification and meticulous care, afford optimum patient care for minimally sized carious lesions.

Composite Resins↗