PubMed Health⌕ Search

SEARCH · PubMed Health

Results for “DENTAL RESTORATION, TEMPORARY”

Explore indexed PubMed citations for clinical trials, systematic reviews and public health research. Read source abstracts and follow each citation to its original PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 919 records · Page 51Linked to original sources
PubMed1990

Interim luting agents, composite core surface hardness and retention of interim and final restorations.

This study compared the effects of ZOE interim cement on the retention of interim acrylic and final cast crowns (cemented with zinc phosphate) over cores of current conventional and hybrid composite resin formulae, and a non-eugenol interim cement (NOG) and a calcium hydroxide liner (CaOH2) on interim and final retention values over hybrid cores. Results were compared to retention of cast crowns over amalgam cores. Retention was measured with an Instron Testing Machine. Location of cement failure during separation was recorded. Surface hardness of each group was compared. Retention of cast crowns cemented with zinc phosphate over amalgam cores was significantly higher than that of any of the resin core groups (ANOVA, P less than 0.05, Sheffe Contrast). There was no significant difference in final casting retention cemented over hybrid or conventional resin cores exposed to ZOE (13.625 vs 14.125 Kg). Final casting retention differences were not significant between the three interim cement groups. Final retention of all groups exposed to an interim luting agent were significantly less than the composite control groups. The use of CaOH, as an interim luting agent for acrylic crowns over hybrid cores compared to ZOE or NOG, should afford significantly greater retention with no adverse effect on the retention of the final casting. While the surface hardness of both types of composite resin was adversely affected by exposure to interim luting agents as compared to controls, there was no correlation between final casting retention values and surface hardness of polished composite. The interim cements invariably failed at the interim acrylic crown interface while the zinc phosphate cement failed at the core interface.

Acrylic Resins↗
PubMedDate not supplied

Intrapulpal temperature during direct fabrication of provisional restorations.

Measurements were made of the heat transferred to the pulp by different types of resins, different volumes of resin, and different types of matrices commonly used in the direct fabrication of extracoronal provisional restorations. A mandibular model was fabricated using extracted teeth that were prepared for extracoronal restorations. Provisional restorations were fabricated for the prepared teeth using conventional direct techniques, and the intrapulpal temperature rise was recorded. The temperature rise ranged from a low of 0.42 degrees C to a high of 7.21 degrees C. Of the three resins tested, the poly(methyl methacrylate) material induced the greatest temperature increase. The vacuum-formed matrix allowed a greater temperature increase than either of the impression material matrices.

Colloids↗
PubMed1990

Direct technique for the fabrication of a visible light-curing resin provisional restoration.

A properly fabricated provisional restoration will, among other things, provide acceptable esthetics. Although many materials have been used for provisional restorations, when esthetics is of primary concern, the choice is limited to tooth-colored resin materials. Recently, a tooth-colored, light-activated urethane dimethacrylate resin has been developed. This material has been reported to be useful for many prosthetic applications, including the indirect fabrication of provisional restorations. This paper presents a technique for the direct fabrication of single-unit provisional restorations using this material. The physical properties of this resin and the advantages and disadvantages of the technique are also discussed.

Acrylic Resins↗
PubMed1990

[Provisional sealing materials: evaluation of leakage].

Purpose of this study was to analyze the behavior of some traditional sealing materials, plus one recently appeared, and test their sealing properties, in order to understand and ascertain the problem of non-hermetical sealing, a problem of clinical significance.

Calcium Sulfate↗
PubMed1990

The autoclaved composite inlay--a useful office-produced restoration.

Many companies are investigating methods of producing composite resins with better physical and mechanical properties through curing methods other than application of the light gun. Such techniques are known as secondary curing techniques. Evidence is presented here of a method for producing a composite resin inlay with improved properties through the use of the typical office autoclave. While the authors do not strongly advocate the use of composite restorations in general as permanent posterior restorations, this method produces enhanced physical and mechanical properties over conventional light cured products. This method is suitable for use as an interim restoration with a high degree of both strength and esthetic value.

Bisphenol A-Glycidyl Methacrylate↗
PubMed1990

Provisional restoration for abutment of an existing removable partial denture.

The abutment of an existing removable partial denture may require a crown restoration. Fabrication of a provisional restoration to fit the existing clasp assembly requires special consideration. This article presents a simple technique for fabrication of such provisional restorations. An alginate impression is made of the arch with the removable partial denture in place. The abutment tooth is then prepared, providing adequate clearance between the clasp assembly and the tooth preparation. Cold curing acrylic resin of proper shade is mixed and poured in the impression of the abutment tooth. The impression is then seated in the mouth and removed before the acrylic resin is completely polymerized. The provisional restoration is then separated from the partial denture, finished and polished.

Adult↗
PubMed1989

In vitro color stability of provisional restorations.

A provisional restoration must protect the prepared tooth, provide comfort and function and be esthetically acceptable and color stable. This study measured the degree of color change of provisional restorations. Five commercially available resins were evaluated: Trim, Tab, Kind, Snap and Duralay. Five cylindrical samples of each resin were fabricated by mixing the powder and the liquid to a predetermined ratio and pouring the mix into a mold. The Minolta Chroma Meter II Reflectance was used to establish the baseline color L* a* b*. The resins were then subjected to accelerated in vitro aging in a Weather-O-Meter and color readings were recorded. The color differentials on delta E* were computed for each sample (delta E*ab = [(delta L*)2+(delta b*)2]1/2). The difference is a quantitative measurement of color change. The National Bureau of Standards describes delta E* as units (NBS Unit = delta E*ab x 0.92). With this parameter only the allowable delta E*ab need be specified rather than the range of allowable L*, a*, b* values. This is important for color comparison and quality control functions. The results showed that Kind had a slight color change delta E* = -1.72, Trim demonstrated the most color change delta E* = -13.84, while the remaining resins demonstrated a noticeable change in color due to in vitro aging.

Color↗
PubMed1977

[Testing of various methods for the determination of processing time for amalgam].

Four different test methods for the determination of the processing time of freshly mixed amalgam pastes were examined with the view to their utility, using 9 commercial powder alloys of different setting speeds. The tests used were a schematised stuffing test, close to the procedure used in practise, the cutting test and the compressive strength test after 10 minutes, both of which are still quoted as alternatives in the provisional standard DIN 13904, as well as a Hg addition test described by Jørgensen. The compressive strength test proved to be the quickest and most accurate. It is therefore best suited for routine examinations and general control and is recommended for inclusion in the DIN. It is necessary to set up calibration curves with the help of the stuffing test in order to estimate the processing time. These have to be separately estimated for filing amalgam and globular amalgam. The cutting test proved to be relatively inaccurate. The Hg addition test, though giving usable values, consumed too much time and material.

Dental Amalgam↗
PubMed1977

Temporization.

Explore the source record for details and available documents.

Dental Restoration, Permanent↗
PubMed1978

[Abrasion measurements in vivo in occlusal composite and amalgam fillings].

A new method for quantitative measurement of occlusal wear on restorations is described. In a clinical evaluation with four different composites and an amalgam the method proved to be simple in execution and very exact. Statistical analysis after 7 months has shown significant differences in wear resistance of the different materials. The nature of the resulting wear was electron optically examined. Typical structural surface characteristics were observed for each of the different materials. More recently developed composities utilizing extremly small filler particles (Aerosil) seem to be comparable to amalgam in wear resistance.

Adult↗