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Biomedical subjects

H R Steiman

Publications and source records attributed to H R Steiman.

14 recordsLinked to original sources
PubMed1997

Scanning electron microscopic evaluation of finishing techniques on IRM and EBA retrofillings.

Various techniques have been advocated for finishing retrofilling materials. This study evaluated marginal interfaces between tooth structure and the retrofilling material following three techniques of finishing IRM and EBA. This interface was evaluated for the presence of flash and for adaptation to the prepared canal walls. Thirty-one teeth were divided into six groups of five and one control. The teeth were instrumented to a minimum of a 35 K-file, obturated with gutta-percha, resected perpendicular to their long axes and ultrasonically prepared to receive a retrofilling. The teeth were filled with either IRM or EBA cement and finished by ball burnishing, burnishing with a moistened cotton pellet, or with a carbide finishing bur in a high-speed handpiece with air/water spray. Photomicrographs were made and examined by four evaluators. Retrofillings finished with a finishing bur displayed significantly better marginal adaptation and little evidence of flash when compared to the other techniques (p < 0.05). There were no significant differences between ball burnished or moistened cotton pellet techniques or between retrofilling materials used in this study (p < 0.05).

Dental Polishing↗
PubMed1995

Scanning electron microscopic evaluation of root-end preparations.

The use of an ultrasonic apical preparation technique has been advocated recently. Root-end preparations in 30 extracted single-canaled human teeth were evaluated, comparing those prepared with ultrasonic instrumentation alone, or in combination with rotary bur preparation, to those prepared with rotary instrumentation alone. Specimens were evaluated for the presence of debris, smear layer, and the smoothness and uniformity of the preparations. The apical preparations were completed according to the varying techniques, examined, and photographed under scanning electron microscopy. Those cavities prepared with the ultrasonic, either alone or in combination with rotary instrumentation, showed the presence of significantly less smear layer compared with those made by burs alone. Cavities prepared with ultrasonic instrumentation in combination with rotary instrumentation contained significantly less debris than those prepared with rotary instrumentation alone. There were no significant differences between the techniques in the smoothness or uniformity of the preparations.

Dental Pulp Cavity↗
PubMed1995

Comparative evaluation of the antibacterial effects of intracanal Nd:YAG laser irradiation: an in vitro study.

The purpose of this study was to determine if the Nd:YAG laser was capable of disinfecting contaminated root canals in vitro. Eighty canals of extracted single-rooted teeth were prepared to size 35 K-file. The teeth were sterilized with ethylene oxide gas and then inoculated with Bacillus stearothermophilus. Eight groups were treated as follows: 1, sterility control; 2, positive control, no treatment; 3, hand instrumentation with sterile water filling chamber; 4, hand instrumentation with NaOCl (5.25%) filling chamber; 5, ultrasonic instrumentation with sterile water; 6, ultrasonic instrumentation with NaOCl; 7, laser exposure with sterile water; and 8, laser exposure with NaOCI. All instrumentation times were 1 min. Teeth were then flushed with 1.0 ml of sterile water onto blood agar plates, and the number of colony forming units were determined. Results indicate that: (i) all groups treated with NaOCI effectively inhibited the growth of B. stearothermophilus; (ii) hand and ultrasonic instrumentation with sterile water did not effectively disinfect root canals; and (iii) the Nd:YAG laser was effective in inhibiting the growth of B. stearothermophilus. The effects of the Nd:YAG laser on other bacteria more commonly found in root canal systems should be evaluated.

Analysis of Variance↗
PubMed1995

Preliminary investigation of ultrasonic root end preparation.

Recently, an ultrasonic instrument intended for root end preparation during periapical surgery has become commercially available. This study evaluated root end preparations in 30 extracted human teeth, comparing those prepared with ultrasonic instrumentation to teeth prepared in a traditional manner with a microhandpiece and to teeth prepared using a combination of the microhandpiece and the ultrasonic instrument. Specimens were evaluated for size of preparation, preparation debridement, and time required for preparation. Preparations with the ultrasonic device were found to be significantly smaller than the other techniques evaluated. Traditional and combined techniques resulted in greater debridement under the conditions of the study, and only the combined technique demonstrated an increase in time required for preparation. Ultrasonic instrumentation may provide significant advantages in the treatment of deeply fluted roots when an isthmus is present by reducing the risk of root perforation.

Dental Pulp Cavity↗
PubMed1994

An in vitro evaluation of microleakage of two new and two old root canal sealers.

An in vitro comparison of apical microleakage of four root canal sealers was performed using a dye leakage/clearing method. Ketac-Endo, Tubliseal (old formula), Tubliseal (new formula), and Roth's 801 cement were compared with a control group of teeth obturated with laterally condensed gutta-percha and no sealer. Teeth were instrumented, obturated, demineralized, and cleared. Linear dye penetration was determined by dissecting microscope. Results were analyzed statistically. All groups obturated with sealer displayed significantly less leakage than the control group. There was no difference between the Tubliseal formulations, and the Ketac-Endo showed significantly more leakage than the three zinc oxide-eugenol-based sealers.

Analysis of Variance↗
PubMed1992

Biocompatibility of retrograde filling materials in the ferret canine. Amalgam and IRM.

Periapical tissue response to retrograde fillings of amalgam and IRM were compared in the mandibular canine of the adult male ferret. Teeth were cleaned and shaped with a standard technique and obturated with gutta-percha. The root apex was then exposed and retrofillings were placed. The animals were grouped according to observation periods of 5, 10, and 15 weeks. At the proper time the animals were killed and the lower canine tooth along with the surrounding bone was removed. The tissue blocks were examined clinically, radiographed, and prepared for histologic examination. The clinical and radiographic examination indicated both materials to be well tolerated by periapical tissues. Microscopic examination of amalgam specimens showed a decrease in inflammation and the formation of a fibrous capsule over the 15-week period. IRM specimens showed persistent inflammation and slower healing potential.

Alveolar Process↗
PubMed1991

Endodontic diagnostic techniques.

Successful endodontics begins with accurate diagnosis. A systematic routine must be followed to obtain the information necessary to arrive at the correct diagnosis. This paper discusses the role of the patient's medical history, as well as subjective, objective, and radiographic examinations in the diagnostic process with special emphasis on information published within the past year.

Dental Pulp Diseases↗
PubMedDate not supplied

Bilateral mandibular regional odontodysplasia with vascular nevus.

Odontodysplasia is a rare clinicopathologic condition that has a variety of expressions, including a range of tooth coloration, formation of hypoplastic enamel affecting one or multiple teeth, bizarre radiographic appearance, and delayed eruption of teeth. An unusual case is presented of bilateral regional odontodysplasia associated with a vascular nevus of the face and neck. A review of the etiology with emphasis on the "local circulatory disease" theory is presented.

Child↗