Apical limit of root canal instrumentation and obturation, part 2. A histological study.

International Endodontic Journal (Impact Factor: 2.05). 12/1998; 31(6):394-409. DOI: 10.1046/j.1365-2591.1998.00183.x
Source: PubMed

ABSTRACT The results of an in vivo histological study involving apical and periapical tissues following root canal therapy after different observation periods demonstrated the most favourable histological conditions when the instrumentation and obturation remained at or short of the apical constriction. This was the case in the presence of vital or necrotic pulps, also when bacteria had penetrated the foramen and were present in the periapical tissues. When the sealer and/or the gutta-percha was extruded into the periapical tissue, the lateral canals and the apical ramifications, there was always a severe inflammatory reaction including a foreign body reaction despite a clinical absence of pain.

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    Australian Endodontic Journal 04/2014; 40(1):2-5. · 0.50 Impact Factor
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    ABSTRACT: The purpose of this study was to assess the accuracy and reliability of the apex locator function of the Gold Reciproc Motor (VDW GmbH, Munich, Germany) during reciprocating movement. Forty extracted incisors with mature apices were included in the study. The canal length was determined by introducing #10 file into the canal until it emerged at the apical foramen. The incisal edge of each tooth was adjusted to obtain 18 mm standard length and to produce a flat reference point. The teeth were embedded in Plexiglas tubes filled with alginate and measured by Root ZX (J. Morita Corp, Tokyo, Japan) and Bingo 1020 (Forum Engineering Technologies, Rishon Lezion, Israel) apex locators. The root canals were instrumented in a reciprocating mode using an R25 Reciproc file in the Gold Reciproc Motor until the green LEDs and orange LED were reached. According to the manufacturer, these LEDs represent the zone between the apical constriction and the apical foramen. No statistically significant differences were found between the length measurements of the 2 electronic apex locators and the third green LED, which is suggested by the manufacturers as the recommended working length. With the limitation of this ex vivo study, the Gold Reciproc Motor's integrated electronic apex locator was found to be as reliable and accurate as the Root ZX and Bingo 1020 apex locators in terms of length control during root canal preparation in the reciprocation mode.
    Journal of endodontics 05/2014; 40(5):694-7. · 2.95 Impact Factor
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    ABSTRACT: Aim: In this in vitro study the variation of root anatomy and canal system of the first human maxillary premolar was evaluated. Materials and Methods: Two hundred and twenty one maxillary first premolars (#221 teeth) were examined. All of the teeth were identified using the accepted criteria of Woelfel as maxillary first premolars. Selected teeth are analyzed using operating microscope (OP) and computed dental radiography (CDR). Results: There was a higher incidence of two-roots form 70.14% (n = 155), 21.72% (n = 48) had one root, and 8.14% (n = 18) had three roots. In the two-root category, 16.29% (n = 36) had bifurcation on apical third, 21.72% (n = 48) had bifurcation on middle third, and 32.13% (n = 71) had bifurcation on cervical third. The examination of root canal systems of the teeth was based on Vertucci’s classification type of canal: 64.58% (#31) of the cases had type IV (2-2-2), 25.00% (#12) type II (2-2-1), 8.33% (#4) type I (1-1-1), and 2.09% (#1) type III (1-2-1). Conclusion: This study showed a high incidence of two-rooted maxillary first premolars collected from different regions in Kosovo. Internal root canal system morphology reflects the external root anatomy. Furthermore, there is correlation between the shape of the outer surface of the root and the shape of the root canal. The cases with one root of the maxillary first premolar with a deep depression on the mesial side contain a double root canal system more often than a single cana
    Open Jornal of Stomatology. 07/2014; Volume 4(Number 7):332-339.

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