Fogorvosi szemle, 2002 (95. évfolyam, 1-6. szám)

2002-04-01 / 2. szám

58

FOGORVOSI SZEMLE ■ 95. évf. 2. sz. 2002.

naformát tudott elkülöníteni: az egyenes csatornát, a csúcsi szakaszon görbülő csatornát, a teljes hosszán görbülő csatornát és a többszörösen görbült csatornát. Ezekre a jól elkülönülő alakokra egy alfabetikus jelölést javasolunk, mely az adott csatorna jellegzetességét írja le, ezek a következők: I, J, C és S.

Irodalom

1. Backman CA, Oswald RJ, Pitts DL: A radiographic comparison of two root canal instrumentation techniques. J Endod 1992; 18: 19-24.

2. Dobó Nagy C, Szabó J, Szabó J: A mathematically based classification of root canal curvatures on natural human teeth. J Endod 1995; 21: 557-560.

3. Dobó Nagy c, Bartha k, Bernáth M, Verdes E, Szabó J: A comparative study of seven instruments in shaping the root canal in vitro. Int Endod J 1997; 30: 124-133.

4. Forsberg J: A method for experimental dental radiography. Int Endod J 1992; 25: 93-96.

5. Ingle Jl, Taintor JF: Endodontics. 3rd ed. Lea & Febiger, Philadelphia, 1985; 245.

6. Schneider SW: A comparison of canal preparations in straight and curved root canals. Oral Surg, Oral Med and Oral Path 1971; 32: 271-275.

7. Southard DW, Oswald RJ, Natkin E: Instrumentation of curved molar root canals with the Roane technique. J Endod 1987; 13: 479-489.

8. Szabó J, Trombitás K, Szabó I: The odontoblast process and its branches in human teeth observed by scanning electron microscopy. Arch Oral Biol 1984; 29: 331-333.

9. Szabó J, Trombitás K, Szabó I: Scanning electron microscopy of the walls of tubules in human coronal dentine. Arch Oral Biol 1985; 30: 705-710.

10. Szabó J, Szabó I, Trombitás K: Inter-odontoblastic fibres in human dentine observed by scanning electron microscopy. Arch Oral Biol 1985; 30: 161-165.

11. Yamaguchi M, Matsumori M, Ishikawa FI, Sakurai T, Nakamura H, Naitoh M, Shiojima M, Kikuchi A: The use of ultrasonic instrumentation in the cleansing and enlargement of the root canal. Oral Surg, Oral Med, Oral Pathol 1988; 65: 349-353.

12. Zidell J: Classification of root canal system. 1975. In: Ingle Jl, Taintor JF: Endodontics. 3rd ed. Lea & Febiger, Philadelphia, 1985; 245.

Dobó Nagy Cs, Ledeczky G, Sulyok P, Szabó J:

Classification of root canals on the basis of their mathematically described axes

Endodontic research requires a mathematically based classification method of root canal forms. The aim of this study was to give a mathematical description of root canal forms using differencial geometrical pattern analysis and computer graphics. The measurements of 433 extracted human roots were carried out on isometric radiographs taken from clinical view. Seven points of root canal axis of the same radiographs were approximated using fourth degree polynomial functions describing the imaginary axis of canals. The Schneider’s angle of each root was also measured for grouping the samples according to this parameter. The classification of root canal form on the basis of Schneider’s angle differs from the classification of geometrical pattern analysis. This type of classification of root canals is suitable for standardizing test specimens, including natural human teeth used for testing root forms: I (straight), J (apically curved), C (continuously curved) or S (multicurved).

Keywords: classification, computergraphics, fourth-degree polynom, morphology, root canal axis