Restorative Dentistry and Endodontics

The Korean Academy of Conservative Dentistry (대한치과보존학회)
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THE INFLUENCE OF DIFFERENT ACCESS CAVITY DESIGNS ON THE FRACTURE STRENGTH IN ENDODONTICALLY TREATED MANDIBULAR ANTERIOR TEETH

근관와동형태에 따른 근관치료된 하악절치의 파절강도

  • Lee Young-Gyun (Department of Conservative Dentistry, College of Dentistry, Kangnung National University) ;
  • Shin Hye-Jin (Department of Conservative Dentistry, College of Dentistry, Kangnung National University) ;
  • Park Se-Hee (Department of Conservative Dentistry, College of Dentistry, Kangnung National University) ;
  • Cho Kyung-Mo (Department of Conservative Dentistry, College of Dentistry, Kangnung National University) ;
  • Kim Jin-Woo (Department of Conservative Dentistry, College of Dentistry, Kangnung National University)
  • 이영균 (강릉대학교 치과대학 치과보존학교실) ;
  • 신혜진 (강릉대학교 치과대학 치과보존학교실) ;
  • 박세희 (강릉대학교 치과대학 치과보존학교실) ;
  • 조경모 (강릉대학교 치과대학 치과보존학교실) ;
  • 김진우 (강릉대학교 치과대학 치과보존학교실)
  • Published : 2004.11.01
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Abstract

Straight access cavity design allows the operator to locate all canals, helps in proper cleaning and shaping, ultimately facilitates the obturation of the canal system. However, change in the fracture strength according to the access cavity designs was not clearly demonstrated yet. The purpose of this study was to determine the influence of different access cavity designs on the fracture strength in endodontically treated mandibular anterior teeth. Recently extracted mandibular anterior teeth that have no caries, cervical abrasion, and fracture were divided into three groups (Group 1 : conventional lingual access cavity, Group 2 : straight access cavity, Group 3 : extended straight access cavity) according to the cavity designs. After conventional endodontic treatment, cavities were filled with resin core material. Compressive loads parallel to the long axis of the teeth were applied at a crosshead speed of 2mm/min until the fracture occurred. The fracture strength analyzed with ANOV A and the Scheffe test at the 95% confidence level. The results of this study were as follows: 1. The mean fracture strength decrease in following sequence Group 1 (4558.90{\;}\pm{\;}77.40{\;}N$), Group 2 ($494.07{\;}\pm{\;}123.98{\;}N) and Group 3 ($267.33{\;}\pm{\;}27.02{\;}N). 2. There was significant difference between Group 3 and other groups (P = 0.00). Considering advantage of direct access to apical third and results of this study, straight access cavity is recommended for access cavity form of the mandibular anterior teeth.

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References

  1. Mauger MJ, Waite RM, Alexander JB, Schindler WG. Ideal endodontic access in mandibular incisors. J Endod 25(3):206-207, 1999 https://doi.org/10.1016/S0099-2399(99)80143-5
  2. Weine FS. Endodontic Therapy. 6th ed. St. Louis, Mosby, 104-163, 2003
  3. Mann G, Smallwood ER, Gulabivala K. Effect of access cavity location and design on degree and distribution of instrumented root canal surface in maxillary anterior teeth. Int Endod J 34(3): 176-183, 2001 https://doi.org/10.1046/j.1365-2591.2001.00359.x
  4. Benjamin KA, Dowson J. Incidence of two root canals in human mandibular incisor. Oral Surg Oral Med Oral Patho 138(1):122-126, 1974
  5. LaTurno SAL, Zillich RM. Straight-line endodontic access to anterior teeth. Oral Surg Oral Med Oral Pathol 59(4) :418-419, 1985 https://doi.org/10.1016/0030-4220(85)90069-6
  6. Zillich RM, Jerome JK. Endodontic access to maxillary lateral incisors. Oral Surg Oral Med Oral Pathol 52(4) :443-445, 1981 https://doi.org/10.1016/0030-4220(81)90347-9
  7. 임은미, 최호영, 박상진, 최기운. 하악 절치의 근관계에 관한 연구. 대한치과보존학회지 27(4) :432-439, 2002
  8. Gutmann JL. The dentin-root complex: anatomic and biologic considerations in restoring endodontically treated teeth. J Prosthet Dent 67(4) :458-467, 1992 https://doi.org/10.1016/0022-3913(92)90073-J
  9. Reeh ES, Messer HH, Douglas WH. Reduction in tooth stiffness as a result of endodontic and restorative procedures. J Endod 15(11) :512-516, 1989 https://doi.org/10.1016/S0099-2399(89)80191-8
  10. Chow TW. Mechanical effectiveness of root canal irrigation. J Endod 9(11) :475-479, 1983 https://doi.org/10.1016/S0099-2399(83)80162-9
  11. Heydecke G, Butz F, Strub JR. Fracture strength and survival rate of endodontically treated maxillary incisors with approximal cavities after restoration with different post and core systems: an in-vitro study. J Dent 29(6) :427-433, 2001 https://doi.org/10.1016/S0300-5712(01)00038-0
  12. Milot P, Stein RS. Root fracture in endodontically treated teeth related to post selection and crown design. J Prosthet Dent 68(3) :428-435, 1992 https://doi.org/10.1016/0022-3913(92)90405-Y
  13. Sorensen JA. Engelman MJ. Ferrule design and fracture resistance of endodontically treated teeth. J Prosthet Dent 63(5): 529-536, 1990 https://doi.org/10.1016/0022-3913(90)90070-S
  14. Tidmarsh BG. Restoration of endodontically treated posterior teeth. J Endod 2(12):374-375, 1976 https://doi.org/10.1016/S0099-2399(76)80100-8
  15. Helfer AR, Melnick S, Schilder H. Determination of the moisture content of vital and pulpless teeth. Oral Surg Oral Med Oral Pathol 34(4) : 661-670, 1972 https://doi.org/10.1016/0030-4220(72)90351-9
  16. Papa J, Cain C, Messer HH. Moisture content of vital vs endodontically treated teeth. Endod Dent Traumatol 10(2):91-93, 1994 https://doi.org/10.1111/j.1600-9657.1994.tb00067.x
  17. Rivera EM, Yamauchi M. Site comparisons of dentine collagen cross-links from extracted human teeth. Arch Oral Biol 38(7):541-546, 1993 https://doi.org/10.1016/0003-9969(93)90118-6

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