J. David Brilliant

An in vivo evaluation of the penetration of an irrigating solution in root canals

Abstract Nineteen roots with vital pulps and 19 roots with necrotic pulp tissue were hiomechanically cleansed according to a standardized procedure of instrumentation. A radiopaque material was used as an irrigant to delineate apical penetration in vivo. Extrusion of the irrigant occurred in cases with vital pulps and in cases with necrotic pulp tissue. The solution was confined to the instrumented space in vital cases, whereas the irrigating agent occupied random dimensions of the periapical lesions in some teeth with necrotic pulp tissue. The solution reached the apex of the preparation sooner in teeth with necrotic pulps than in teeth with vital pulps.

The effect of serial preparation versus nonserial preparation on tissue removal in the root canals of extracted mandibular human molars.

Traditional methods of root canal preparation were compared with a serial type of preparation that included the use of rotary instruments. The serial type of preparation method proved more effective in debriding the root canals than did the traditional methods.

Effect of irrigation on the production of extruded material at the root apex during instrumentation

The effect of irrigation on the production of extruded material at the root apex during standard instrumentation was studied with the use of teeth stored in 10% Formalin. The canals that were instrumented in the presence of an irrigating solution all showed collectible amounts of extruded material. Instrumentation of canals without an irrigant did not produce collectible extruded material.

A Preliminary Clinical Study on the Use of Tricalcium Phosphate as an Apical Barrier

A one-appointment procedure for obturating permanent teeth with nonvital pulps and open apices was evaluated clinically. During nine months of observation, the one-appointment treatment using tricalcium phosphate or calcium hydroxide as a substitute apical barrier was as effective as the conventional multi-appointment technique that seeks a natural apical barrier.

Tricalcium phosphate as an adjunct to apical closure in pulpless permanent teeth

Tricalcium phosphate was effective in inducing apical closure in human permanent pulpless teeth with flaring apices. However, it was not more effective than the calcium hydroxide that was used as a control.

A comparison of the efficacy of serial preparation versus Giromatic preparation

One hundred root canals in the mesial roots of extracted mandibular molars were prepared with either the Giromatic or by serial preparation. The roots were sectioned at 1, 3, and 5 mm from the apex, stained, and examined under low power of the light microscope. The serial preparation was significantly more effective than the Giromatic preparation in removing tissue debris from the root canal.

Induced apical closure of permanent teeth in adult primates using a resorbable form of tricalcium phosphate ceramic.

Conditions of an open apex were simulated in four Cynalmolgus monkeys by extirpating the vital pulps and by preparing the root canals through the apex. The apical 3 mm of 20 teeth was treated with a tricalcium phosphate resorbable ceramic. The periapical tissues of the treated teeth showed a minimal inflammatory response. The periodontal ligament tended to regenerate. Formation of mineralized tissue within the root canal occurred, but bridging was incomplete.

Direct pulp capping of permanent teeth in primates using a resorbable form of tricalcium phosphate ceramic

A resorbable ceramic was placed over 22 surgically created pulpal exposures in an experiment. Histological evidence showed that formation of a dentinal bridge took place by direct apposition on the pulpal tissues that were treated with a ceramic form of tricalcium phosphate. Formation of a dentinal bridge appears to be predictable. The bridge is contiguous and thick, pulpal inflammation is minimal, and odontoblasts ore observed directly under and in contact with the bridge. The ceramic form of tricalcium phosphate appears to enhance the formation of a dentinal bridge in contrast with the calcium hydroxide that was used as the control.

Preliminary scanning electron microscope investigations of accessory foramina in the furcation areas of human molar teeth

Abstract Preliminary observations of the furcation areas of human maxillary and mandibular molars have been carried out with the scanning electron microscope in order to ascertain the size, distribution, and characteristics of the accessory canals.

Preliminary scanning electron microscopic study of the chlororosin lateral condensation technique

The root canals of 26 single-rooted teeth were mechanically instrumented by the serialization method and were laterally condensed with guttapercha and Grossmans sealer, gutta-percha and chlororosin, or gutta-percha with Grossmans sealer and chlororosin. The teeth were prepared for the scanning electron microscope, and photomicrographs were taken of the apical, middle, and coronal thirds of the root canal system. All three filling techniques were effective in sealing the interface at different points, yet total contact throughout the canal was not attained. Chlororosin showed an adhesive characteristic, producing a homogeneous and closely adapted filling. Grossmans sealer showed a void-filling capability but did not produce a homogeneous or closely adapted gutta-percha filling.