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Biomedical subjects

J L Gutmann

Publications and source records attributed to J L Gutmann.

At least 91 records · Page 5Linked to original sources
PubMed1993

An assessment of the plastic Thermafil obturation technique. Part 3. The effect of post space preparation on the apical seal.

The effect of post space preparation on the apical seal of teeth roots treated with the plastic-cored Thermafil was studied in vitro. Single rooted teeth with mature apices were prepared chemomechanically and obturated with alpha-phase gutta-percha, Thermafil, on plastic core-carriers and sealer, Sealapex. The teeth were divided randomly into four groups of 18 teeth each. In two of the groups post space was prepared by hand using a Parapost drill (diam. 1.25 mm) after gutta-percha removal with Peeso reamers in a slow-speed handpiece, one group immediately after canal obturation and the other after storage in 100% relative humidity at 37 degrees C for 1 week; 5 mm of root filling was left intact. The time taken to remove the gutta-percha was recorded. Post space was not prepared in the control groups. Apical leakage was determined using black India ink. The teeth were demineralized, rendered transparent, and linear measurement of dye penetration was recorded. Results showed that there were no significant differences in leakage between any of the groups (P > 0.05). There was no statistically significant difference in the time required to remove the gutta-percha from the root canals in both groups (P < 0.05). It is concluded that under the conditions of this study post space preparation immediately after obturation, or after a delay of 1 week, does not affect the apical seal of Thermafil with plastic core-carriers.

Analysis of Variance↗
PubMed1992

The dentin-root complex: anatomic and biologic considerations in restoring endodontically treated teeth.

The restoration of endodontically treated teeth has been the focus of considerable controversy and empiricism. Time-tested methods have been highly successful in some respects, but failures are still apparent. The inherent causes of failure are rarely evaluated and the limitations of specific restorative systems are seldom identified. Regardless of the system, there should be a thorough understanding of the anatomy and biology of the dentin and root supporting the restoration on the part of the practitioner, because both endodontic and restorative procedures alter the hard tissues.

Biology↗
PubMed1992

Contemporary perspectives on canal obturation.

The astute practitioner must recognize that no one particular obturation technique will satisfy the myriad of clinical cases that require endodontic therapy. The obturation method selected, whether it be a conventional method or one of the contemporary ones, must be consistent with the overall goals of clinical practice; i.e. to provide the best possible care for our patients. Although all obturation techniques have their advantages as well as their disadvantages, the clinician should be open-minded enough to accept and master a number of obturation techniques and not just focus on one. At the same time, he or she should be able to provide a biologically sound rationale for the method he or she chooses. In time, this philosophy will generate dental practitioners who can not only solve problems but who can also think critically.

Humans↗
PubMed1992

Clinical, radiographic, and histologic perspectives on success and failure in endodontics.

There is a tremendous impact of multiple variables on the decision-making process in determining success or failure. The best approach to quality outcomes is to minimize the variables that can affect case adversity. Therefore, it behooves the clinician, who chooses to do endodontic therapy, to fully understand the level of treatment that is necessary to achieve success and to attain that level on a consistent basis. Additionally, the wise and prudent clinician should be able to assess completed treatment, with the proper integration of clinical and radiographic factors, in an environment that minimizes the shackles of bias and the dictates of cognitive dissonance.

Decision Making↗
PubMed1991

Revisiting the post puller.

The removal of an intraradicular post is frequently part of retreatment and the fabrication of a new coronal restoration. This article highlights the use of a post puller for safe and effective removal of an intraradicular post in conjunction with retreatment.

Dental Debonding↗
PubMed1991

Perspectives on periradicular healing using Sealapex: a case report.

The use of the calcium hydroxide-containing root canal sealer, Sealapex, has been questioned regarding its predisposition to solubility and subsequent effect on the root canal seal and periradicular healing. This case report demonstrates, radiographically, dissolution of excess sealer in the periradicular tissues with subsequent osseous repair which was similar to healing in periradicular tissues where there was no extruded sealer.

Adolescent↗
PubMed1990

Bactericidal effects of human neutrophils and sera on selected endodontic pathogenic bacteria in an anaerobic environment.

Phagocytosis by normal human neutrophils and the bactericidal activity of normal human pooled serum were measured under anaerobic conditions on six endodontic pathogenic bacterial species from the genera Actinomyces, Bacteroides, Fusobacterium, Peptostreptococcus and Streptococcus. The results revealed that Actinomyces viscosus was not killed either by human neutrophils or by 20 per cent serum; Peptostreptococcus anaerobius was not killed by either 20 per cent or 95 per cent serum; and Bacteroides intermedius was susceptible to both 20 per cent and 95 per cent serum, but was not killed by neutrophils after exposure for 20 minutes. The other species showed intermediate susceptibility patterns. Such results suggest that oral pathogens vary with regard to the bactericidal effects of these two host defense mechanisms, and that this variation may at least in part explain the relative quantities of microbes recovered in certain oral infections.

Actinomyces↗
PubMed1990

Perspectives, controversies and directives on pulpal-periodontal relationships.

While established clinical, radiographic and histologic criteria exist to explain the intimate relationship of the pulp and periodontium during pathological states, the recognition, diagnosis and treatment of this perplexing interplay remains a challenge for the practitioner. This dynamic interrelationship is investigated with a focus on simplicity and succinctness to enhance diagnostic probabilities, clarify treatment modalities and provide realistic prognoses in management.

Dental Pulp Diseases↗
PubMed1989

Odontiatrogenic tooth fracture.

While the awareness of vertical tooth fractures, whether incomplete or complete, is increasing, sufficient attention has not been paid to the manner in which the dentist may contribute to the occurrence of these fractures. This paper focuses on the most likely areas in which the practitioner can either misdiagnose the presence of a fractured tooth or where dental procedures contribute to fracture of the tooth structure. For this type of fracture the authors propose the term 'odontiatrogenic tooth fracture'.

Humans↗