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Results for “Post and Core Technique”

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At least 73 records · Page 4Linked to original sources
PubMed1997

An experimental study of the removal of cemented dowel-retained cast cores by ultrasonic vibration.

A technique for the removal of cemented post-cores by means of ultrasonic vibration was studied clinically and histologically. The removal time was measured for 80 extracted human teeth, including 40 single-rooted teeth and 40 multiple rooted ones and then statistically analyzed. The periapical tissue reaction to the ultrasonic vibration was also examined histologically in dogs. The best result was achieved when lateral vibration was simultaneously given by 2 removal tips using 2 ultrasonic generators. There was little harmful influence on the periodontal tissue, excluding a transient reversible reaction.

Animals↗
PubMed1999

Comparison of the retentive properties of six prefabricated post overdenture attachment systems.

STATEMENT OF PROBLEM: There are few research studies concerning prefabricated posts overdenture attachment systems using multiple pull cycles. PURPOSE: This study tested 6 prefabricated post overdenture attachment systems (AccessPost Overdenture, ERA white and ERA grey, Flexi-Overdenture, O-SO and ZAAG) measured to simulate wear over a 2000 pull cycle and compared the in vitro retention, measured (pounds). MATERIAL AND METHODS: Records of the pounds of force necessary to separate each system were made at the beginning of testing, at pull 10 and then at every 50th pull until the 2000th pull was attained. All pulls were performed manually with a Shimpo force gauge. Absolute force (AF) and relative force (RF) were compared, AF being the force required at any pull to separate the overdenture device, whereas RF is the force required at the first pull. RESULTS: There was considerable difference of the force required at pull 1 for the ERA white, O-SO and ZAAG anchor systems, then the AccessPost overdenture, and finally the Flexi-Overdenture and ERA grey attachment systems. CONCLUSION: At pull 2000, there was no statistical difference between any of the attachments studied. The amount of force necessary to offer functional retention to a specific patient wearing an overdenture may vary considerably, depending on the many factors in fabricating the overdenture, and the age, strength, musculature, and the expectations of the patient.

Dental Prosthesis Retention↗
PubMed1997

Thermographic assessment of heat generated on the root surface during post space preparation.

The mechanical preparation of a post space in a root filled tooth is commonly carried out using rotating instruments in a slow handpiece. This procedure creates frictional heat which may be transferred to the root surface. In this investigation, the temperature changes on the root surface of 12 root filled, extracted human premolar teeth during preparation of post spaces were analysed using an infrared thermal imaging camera. A rotational speed of 8000 r.p.m. was used and the teeth were prepared with size 2 and 3 Peeso reamers and a red Parapost drill to the optimal length. The results indicate that very large temperatures are generated on the root surface and that this is greatest during the Parapost preparation stage. The long-term clinical effects of post space preparation by engine driven drills would warrant further investigation.

Bicuspid↗
PubMed2002

Temporization for endodontics.

Teeth undergoing root-canal therapy are susceptible to microbial contamination from oral fluids both during and after treatment. With the exception of single-visit treatment, the use of a temporary restoration is mandatory. This review aims to provide an overview of the materials and techniques used for short- and long-term restorations during and immediately after endodontic treatment, and to make clinical recommendations. Further research is necessary to determine the effectiveness of temporary restorations in the conditions of the oral environment, especially with respect to leakage and functional demands.

Crowns↗
PubMed1991

[Dentinal lesions caused by the use of endodontic posts].

An endodontic treatment has been effected on 36 extracted teeth, using drills; certain endodontic posts presently on the market have been successively inserted inside 18 teeth: Flexipost (Essential Dental System); Parapost Plus (Whaledent); dentatus (Dentatus). The teeth have been sectionized and watched through a photomicroscope to check an eventual presence of dentinal damages.

Dental Implants↗
PubMed1997

[The effect of bonded and nonbonded posts on the fracture resistance of dentin].

This in vitro study determined the effect of bonded and non-bonded cast, serrated, tin plated, parallel gold posts on the fracture resistance of surrounding dentine walls. Specimens were divided into two groups. One group's posts were luted with zinc phosphate cement and the other group's posts were tin-plated and adhesively bonded with an adhesive resin cement. Three different dentine wall thicknesses, namely 0.5 mm, 0.75 mm and 1.0 mm were prepared, subdividing the specimens of each main group into three subgroups. Specimens were subjected to a 50 degrees oblique force. The force required to fracture the dentinal walls was registered. There was no statistically significant differences in the fracture resistance of dentine with the two different cements or of the different dentine wall thicknesses.

Dental Bonding↗
PubMed1995

The effect of immediate and delayed post space preparation and post length on the apical seal.

The purpose of this study was to investigate in vitro the effect of immediate and delayed post space preparation as well as the effect of remained length of gutta-percha on the apical seal of endodontically treated teeth obturated by lateral condensation technique using Ketac-Endo as root canal sealer. The apical seal was evaluated by measuring the microleakage using an electrochemical technique. It was found that, the degree of apical leakage is dependent on the length of post space preparation or the remained length of gutta-percha. Also the post space preparation should be delayed until maximum setting of Ketac-Endo root canal sealer.

Dental Leakage↗
PubMed2006

Survival time of cast post and cores: a 10-year retrospective study.

OBJECTIVES: The aim of this retrospective, longitudinal study was to examine the survival time of custom-fabricated, cast post and cores and to evaluate, which covariates influence the risk of failures over a period of up to 10 years based on a large patient collective. METHODS: The files of 565 patients, who had been fitted with a total of 802 custom-fabricated, cast post and cores using a standardised technique, were analysed. The following parameters were used in the evaluation: age of the post and cores, fabrication technique (direct, indirect), type of prosthetic restoration, location (upper, lower jaw), type of tooth (anterior, premolar, molar), number of root posts, luting material, post and core alloy and cause of failure. The survival probability was assessed using Kaplan-Meyer analysis. Cox regression was used to assess the risk of failure and identify possible covariates. RESULTS: The average survival time of the post and cores was 7.3 years. The cumulative failure rate was 11.2%. The most common complication was loss of retention of the post and cores. High-gold-content posts had a lower risk of failure than posts made from semi-precious alloy. The type of restoration fitted had a significant influence on the survival probability. CONCLUSIONS: Post and cores custom-fabricated using a standardised fabrication technique have a good long-term prognosis. The most common cause of failure is loss of retention. The durability of posts with low friction at the try-in stage cannot be compensated for by using glass ionomer cement as the luting material.

Adolescent↗
PubMed1979

Post and core fabrication beneath an existing crown.

A technique has been described for constructing a post and core for a tooth fractured prior to insertion of a fixed partial denture. In selected patients, this method of repair offers an acceptable alternative to a more costly and time-consuming refabrication of a fixed prosthesis.

Crowns↗
PubMed2006

Treatment concepts for restoration of endodontically treated teeth: A nationwide survey of dentists in Germany.

STATEMENT OF PROBLEM: Opinions concerning proper restoration of endodontically treated teeth (ETT) vary. A variety of techniques and materials for post-and-core restorations are available. The rationale for post placement performed by German dentists was unknown. PURPOSE: The purpose of this study was to determine current opinions, applied techniques, and materials for the restoration of ETT in Germany. MATERIAL AND METHODS: A nationwide questionnaire-based survey containing 18 multiple choice questions regarding treatment philosophies, favored post type, and materials for core foundations was mailed to 36,500 German general dentists. A total of 6029 questionnaires (16.5%) were returned. Data were evaluated in terms of the dentists' occupational experience and the frequency of post placement. Descriptive statistics were used to analyze the data. RESULTS: Irrespective of their occupational experience, 52% of the surveyed dentists consider post placement for almost every postendodontic restoration of ETT. The majority of dentists (54%) believe that a post reinforces ETT. Cast posts and cores are used by 55% of all dentists, whereas 34% use prefabricated posts exclusively. Screw posts are the most popular prefabricated post type (47%). Composite resin (51%) is preferred for core foundation, followed by glass ionomer cements (GICs) (26%). Amalgam is seldom used (0.5%). Posts are placed primarily with zinc phosphate cement (51%), followed by GIC (38%). CONCLUSION: The treatment philosophy of German dentists is not in complete agreement with recommendations found in the literature. The belief that a post would reinforce an ETT might explain the high frequency of post placements. Due to the partially inconsistent responses, it is difficult to derive a generalized treatment concept.

Cementation↗