Journal of Endodontics Research

Shaping ability of GT Rotary Files in simulated resin root canals

muveqqeti@gmail.com (JofER editor) — Wed, 10 Jul 2002 00:00:00 -0500

F.L.G. Calberson, C.A.J.G. Deroose, G.M.G. Hommez, H. Raes and R.J.G. DeMoorDepartment of Operative Dentistry and Endodontology, Dental School, Ghent University Hospital, Ghent University, Gent, Belgium.Department of Biology, Ghent University, Gent, Belgium.Aim.The aim of this study was to determine the shaping ability of GT Rotary Files in simulated root canals. Conclusions.Under the conditions of this study, GT Rotary Files produced acceptable canal shapes. In narrow and curved canals, the length of the straight section of the canal determines the direction of transportation more than the angle of the curve. In the 608 curves, a high incidence of instrument deformation was found when using the 0.04 tapered instruments.

A study on the thickness of radicular dentine and cementum in anterior and premolar teeth

muveqqeti@gmail.com (JofER editor) — Mon, 08 Jul 2002 00:00:00 -0500

C. Bellucci & N. PerriniPrivate practice, Rome, Italy.Accademia Italiana Endodonzia, Pistoia, Italy. Aim.This study aimed to measure the thickness of radicular dentine and cementum in incisors, canines and premolars, and to develop geometric average models. Conclusions.The aim of the study was to calculate an average thickness of root dentine and cementum for anterior and premolar teeth. The results obtained and the analysis conducted allowed the formulation of a hypothesis of a â€standard averageâ€ form for each group of teeth. Based on the results of this study, the following conclusions were drawn: Wall thicknesses varied greatly. Generally, thicknesses were greater on the lingual surfaces of the roots. Statistically significant differences between thicknesses in the mesial and distal surfaces of the roots were observed only in one case. Nevertheless, many roots were flattened mesio-distally. Wall thickness was thin in the apical third.

In vivo determination of root canal length: a preliminary report using the Tri Auto ZX apex-locating handpiece

muveqqeti@gmail.com (JofER editor) — Sat, 06 Jul 2002 00:00:00 -0500

F. Grimberg, G. Banegas, L. Chiacchio & O. Zmener Department of Adult Dental Care, Faculty of Odontology, University of Buenos Aires, Argentina.Aim.The aim of this study was to assess the clinical perfomance of a cordless handpiece with a built-in apex locator - the Tri Auto ZX - designed for root canal preparation with nickel-titanium rotary files. Conclusions.Firstly, the EL and ARL were coincident in all instances. When both EL and ARL were compared with AL, the values registered were either coincident or different in +-0.5 mm from the AL (P < 0.05). Secondly, the Tri Auto ZX system protects against overpreparation.

Effects of rotary instruments and ultrasonic irrigation on debris and smear layer scores: a scanning electron microscopic study

muveqqeti@gmail.com (JofER editor) — Thu, 04 Jul 2002 00:00:00 -0500

B. E. Mayer, O. A. Peters & F. Barbakow Department of Preventive Dentistry, Cariology and Periodontology, University of Zurich, Switzerland.Aim.This study evaluated debris and smear layer scores after two types of instruments manufactured from different alloys were used to ultrasonically activate irrigants during canal preparation. The influence of two rotary preparation techniques on cleanliness of the shaped canals was also studied. Conclusion.Under the conditions of this study, ultrasonically activated irrigation did not reduce debris nor smear layer scores of prepared root canals. This finding was not influenced by the design of nor the material used to fabricate the ultrasonic tips used to transmit ultrasonic energy. No significant differences in cleaning root canals were recorded between the Lightspeed and ProFile .04 rotary instruments evaluated.

The ferrule effect: a literature review

muveqqeti@gmail.com (JofER editor) — Tue, 02 Jul 2002 00:00:00 -0500

N. R. Stankiewicz & P. R.WilsonGeneral Dental Practice, Bath, UK.School of Dental Science, The University of Melbourne, Melbourne, Australia.Literature review.A ferrule is a metal ring or cap used to strengthen the end of a stick or tube. It has been proposed that the use of a ferrule as part of the core or artificial crown may be of benefit in reinforcing root-filled teeth. A review of the literature investigating this effect is presented. The literature demonstrates that a ferrule effect occurs owing to the artificial crown bracing against the dentine extending coronal to the crown margin. Overall, it can be concluded that a ferrule is desirable, but should not be provided at the expense of the remaining tooth/root structure.

Hemisection for treatment of an advanced endodontic-periodontal lesion

muveqqeti@gmail.com (JofER editor) — Wed, 26 Jun 2002 00:00:00 -0500

H. Haueisen & D. Heidemann Department of Restorative Dentistry, University of Dentistry ZZMK (Carolinum), Johann Wolfgang Goethe University, Frankfurt, Germany. Aim.To emphasize the importance of primary endodontic treatment when dealing with endoâ€"perio lesions and to demonstrate the considerable healing potential of the endodontic aspect. Key learning points. The origin of a combined endoâ€"perio lesion is indicated by its clinical and radiographic appearance. The periodontal situation is often misinterpreted. The prognosis for the endodontic element of treatment is excellent. Local pathologic processes in the oral cavity may affect a patientâ€s general health.

The effect of AH 26 and AH Plus on MCF-7 breast cancer cell proliferation in vitro

muveqqeti@gmail.com (JofER editor) — Tue, 18 Jun 2002 00:00:00 -0500

R. Pulgar, J. J. Segura-Egea, M. F. Fernandez, A. Serna3 & N. OleaDepartment of Stomatology, School of Dentistry, University of Granada, Granada, Spain.Department of Stomatology, School of Dentistry, University of Sevilla, Sevilla, Spain.Laboratory of Medical Investigation, Department of Radiology, School of Medicine, University of Granada, Granada, Spain.Aim.The purpose of this study was to determine whether AH 26 and AH Plus have in vitro oestrogenic effects. Conclusions.AH 26 showed in vitro oestrogenic effect, but not AH Plus. The endodontist must consider the possible oestrogeniceffect of AH 26, as well as the cytotoxic effects of root filling materials, in order to avoid the leakage of sealer through the apex during root canal treatment. The choice of AH Plus as endodontic sealer avoids the possibility of oestrogenic activity in the periradicular tissues.

In vitro comparison of root-canal measurements with conventional and digital radiology

muveqqeti@gmail.com (JofER editor) — Sat, 15 Jun 2002 00:00:00 -0500

A. Lozano, L. Forner, C. Llena Endodontic, Dental Pathology and Therapeutics Unit, Department of Stomatology, Faculty of Medicine and Dentistry, University of Valencia, Spain. Aim.The present study compared the efficacy of digital and conventional radiology for root-canal length measurement. Conclusions.Conventional radiography with any size of file and regardless of the angle or magnification was the most precise imaging diagnostic technique for determining root-canal length amongst the systems examined in the present study. For file sizes larger than15, the performance of the digital systems was similar to that of conventional radiography in terms of their capacity to diagnose working length, with no influence being exerted by the angle or magnification involved. T he differences observed between the DR and conventional systems have no clinical relevance.

Failure of ProFile Ni-Ti instruments used by an inexperienced operator under access limitations

muveqqeti@gmail.com (JofER editor) — Wed, 12 Jun 2002 00:00:00 -0500

G. M. Yared1 & G. K. KulkarniDiscipline of Endodontics and Preventive Dentistry, Faculty of Dentistry, University of Toronto, Ontario, Canada. Aim.The purpose of this study was to evaluate the failure incidence of ProFile nickel-titanium rotary instruments (PRI) when used by an inexperienced operator in conjunction with different motors and under limitations of access. Conclusions.The results of the present study suggested that a very low torque control motor was safer than on air, high torque or low torque control motors when PRI taper 6% were used byan inexperienced operatorat170 rpm and under limitations due to access.

A preliminary study of the percentage of gutta-percha-filled area in the apical canal filled with vertically compacted warm gutta-percha

muveqqeti@gmail.com (JofER editor) — Mon, 10 Jun 2002 00:00:00 -0500

M.-K.Wu, L.W. M. van der Sluis & P. R.Wesselink Department of Cariology Endodontology Pedodontology, Academic Centre for Dentistry Amsterdam (ACTA), Amsterdam, the Netherlands. Aim.The aim of this study was to determine the influence of the width of apical root canals and the depth of heat application during warm vertical compaction on the percentage of gutta-percha-filled area (PGFA) in the apical root canal. Conclusions.After warm vertical compaction, the quality of adaptation of gutta-percha to the wall of the apical root canal varies; the influencing factors in this study were the depth of heat application and the width of the apical root canal.