Do dental impression materials play a role in cross contamination?

Objective: Dentists are required to institute infectious control procedures. Dental impression materials possessing antimicrobial properties may aid in reducing the risk of cross contamination since impression materials might play a role as carriers. The purpose of this study was to evaluate the antimicrobial properties of four impression materials.

In vitro antibacterial evaluation of flowable restorative materials.

Objectives: The microgap at the tooth-restoration interface is inevitable and may allow bacterial penetration that could lead to failure. The purpose of this in vitro study was to assess the antibacterial potential of 4 flowable composite restorative materials.

Method And Materials: The antibacterial potential of Aeliteflo (Bisco), Filtek Flow (3M ESPE), Tetric Flow (Ivoclar Vivadent), and Dyract Flow (Dentsply) was tested against Streptococcus mutans.

Restoration of endodontically treated teeth review and treatment recommendations.

Coronal restorations and posts can positively influence the long-term prognosis of teeth following root canal therapy. Final sealing the canal by placing an appropriate post and core will minimize leakage of oral fluids and bacteria into the periradicular area and is recommended as soon as possible after completion of root canal filling. Glass ionomer or MTA placed over the residual root canal filling after post space preparation may be effective to prevent bacterial leakage.

Fracture resistance of endodontically treated teeth restored with combined composite-amalgam restorations.

Objective: To evaluate the resistance to fracture of endodontically treated teeth restored with combined composite-amalgam restorations in comparison to all-amalgam restorations.

Method And Materials: Forty-eight human premolar teeth were equally divided into 4 groups. Mesio-occlusodistal (MOD) cavities were prepared in 3 groups, and in the fourth group, a modified MOD preparation was designed with an additional buccolingual groove.

Treatment policies among Israeli specialists in paediatric dentistry.

Aim: This was to evaluate some suggested diagnostic procedures, treatment policies and professional attitudes of specialists in paediatric dentistry, in light of the periodically published guidelines by The American Academy of Pediatric Dentistry, The European Academy of Paediatric Dentistry and The British Society of Paediatric Dentistry.

Methods: Using a structured questionnaire, 67% of the Israeli specialists in paediatric dentistry, who agreed to participate in this study, were personally interviewed.

Results: Only 7.

Endodontic failure caused by inadequate restorative procedures: review and treatment recommendations.

A review of the literature was performed to determine whether prompt placement of coronal restorations, including sealing and placement of posts and cores, can positively influence the long-term prognosis of teeth after root canal therapy. Both hand and MEDLINE searches were employed to identify peer-reviewed articles on radicular apical integrity after coronal restorations, especially where root canal space was used for post and core fabrication. A total of 41 articles published between 1969 and 1999 (the majority from the 1990s) were reviewed.

Stiffness of different designs and cross-sections of maxillary and mandibular major connectors of removable partial dentures.

Statement Of Problem: Major connectors of removable partial dentures must distribute forces bilaterally without damaging the supporting tissues.

Purpose: This study investigated which design and cross-sectional shape of major connectors most favorably influence rigidity and flexibility.

Methods And Material: Five designs for maxillary removable partial denture major connectors and 5 lingual bar major connectors of different cross-sectional forms were cast in chrome cobalt alloy on a master cast.

Further aspects of design for distal extension removable partial dentures based on the Kennedy classification.

A supplement to the Kennedy classification of partially edentulous arches for restoration with removable partial dentures has been suggested. Factors affecting denture design relating to the position of the abutment teeth, the symmetry of the edentulous distal extensions, the arch form and the cross-sectional shape of the residual ridges have been discussed and classified. An understanding of the movement of the denture bases in relation to the influence of these factors makes for a rational approach to removable partial denture design and the treatment of complications observed clinically in removable partial denture wearers.

Anterior implant-supported overdentures.

Retention of complete mandibular dentures can be successfully achieved by means of an implant-retained or natural tooth-retained bar and clip system in the anterior segment of the mandible. The same design principles hold true for both methods of anchoring the retentive bar. These retentive elements must be constructed to allow some freedom of movement around a fulcrum line designed to be perpendicular to the sagittal plane.

Designing clasps for the asymmetric distal extension removable partial denture.

Retentive clasp components can be created to minimize torquing forces on abutment teeth incorporated in the support and retention of bilateral distal extension removable partial dentures. Functional movement of the combined tooth-mucosa-borne prosthesis about the axis of rotation necessitates consideration of retentive element design modifications, particularly as they relate to bilateral asymmetric distal extension situations.

Reduction of microleakage in class II composite resin restorations using retentive pins.

The effect on microleakage of Bondent parapulpal pins used in class II composite resin restorations was evaluated in vitro. Bulk and incremental packing and polymerization techniques were compared, using pins anchored at the gingival cavity walls. Evaluation of microleakage was carried out following cyclic load application and an extended thermocycling procedure by the assessment of dye penetration.

Effect of mouthguard bleaching on enamel surface.

Purpose: To evaluate in vitro the effect of 10% carbamide peroxide in a mouthguard on the shear bond strength of resin composite to bleached enamel surfaces and morphological changes in these surfaces.

Materials And Methods: Thirty anterior extracted were divided into a control and a test group. Plastic trays were made for each tooth and the test group treated with Opalescence bleaching gel and incubated at 37 degrees C humid environment for 8 hours.

Biomechanical considerations in restoring endodontically treated teeth.

Various concepts for dental treatment have been established without appropriate documentation, such as restoration of endodontically treated teeth. Some researchers and dentists strongly recommend including a post with the restoration to strengthen the root. Other studies have indicated that posts may substantially weaken the roots and should be avoided.

Use of roots to establish favorable removable partial denture design: case reports.

Judicious retention of roots can alter the position of the anterior fulcrum line and so simplify removable partial denture design. Complicated tooth-tissue-supported designs are thus transformed into much simpler tooth-supported removable partial overdentures.

Overcasting to repair a fractured porcelain fixed partial denture.

Long-span, permanently cemented, multiunit prostheses that suffer a fracture of one of the porcelain facings present difficult and often embarassing problems to the clinician. Silane coupling repair systems, although quick, simple, and inexpensive, do not ensure a long-lasting result. An alternative technique involving use of a porcelain-fused-to-metal overcasting and composite resin cement is presented.

The degree of zinc phosphate cement coverage of complete crown preparations and its effect on crown retention.

This investigation examined the amount of retentive area covered by cement under complete coverage crowns and its effect on retention. Sixty crowns of self-cured acrylic resin were prepared on 60 identical brass dies and were divided into six groups of 10 crowns each according to different cement applications. The results showed that retention was dependent on the amount of retentive area covered by the cement.

Microleakage in three designs of glass ionomer under composite resin restorations.

Three Class V cavity configurations with walls above and below the cemento-enamel junction were compared when 'sandwich' technique restorations with glass ionomer and composite resin were used. No dye penetration occurred at the occlusal cavosurface margin when the latter was bevelled and light-cured Scotchbond was applied to the etched enamel before restoration with Durafil composite resin. The least dye penetration at the gingival margin was observed when Ketac bond glass ionomer covered the entire non-bevelled wall.

Amalgam restoration completion. Objectives, methods and armamentarium.

The success of an amalgam restoration is multifactorial. Attention must be paid to the manipulation and condensation of the alloy, the final contouring, and the finishing procedures. A discussion of current amalgam alloy, including the goals and sequence of the restorative procedure, are presented with emphasis on the instruments and methods.

The effect of ultrasonic cleaning and air polishing on the marginal integrity of radicular amalgam and composite resin restorations. An in vitro study.

This study attempts to put at ease some uncertainty of a possible damaging effect of ultrasonic scaling and air polishing procedures on dental restorations (amalgam and composite resin). Under optimal in vitro conditions, the margins of 120 restorations were subject to thorough ultrasonic and air polishing instrumentation in order to mimic those extensively used in periodontal treatments. Light-cure composite resin and Dispersalloy amalgam alloy were used to restore class V cavities at the CEJ.

Examination of tooth pulp following laser beam irradiation.

An attempt was made to determine the maximum amount of laser energy which could be utilized without impairing pulpal vitality. Forty rat molar teeth were irradiated in vivo; the Sharplan CO2 laser modality, focused to a 0.2-mm-diameter spot size was used.