The smear layer in endodontics - A review

International Endodontic Journal

Volumn 43, Issue 1, 2010, Pages 2-15

  Violich, D R ^a   Chandler, N P ^b  

^a Private Endodontic Practice   (New Zealand)

^b UNIVERSITY OF OTAGO   (New Zealand)

Author keywords

Dentine; Endodontic treatment; Ethylenediaminetetraacetic acid; Smear layer

Indexed keywords

BIOMEDICAL AND DENTAL MATERIALS; EDETIC ACID; HYPOCHLORITE SODIUM;

DENTAL SURGERY; ENDODONTICS; HUMAN; INSTRUMENTATION; METHODOLOGY; REVIEW; SOLID STATE LASER; ULTRASOUND;

EDETIC ACID; HUMANS; LASERS, SOLID-STATE; ROOT CANAL IRRIGANTS; ROOT CANAL PREPARATION; SMEAR LAYER; SODIUM HYPOCHLORITE; ULTRASONICS;

EID: 71949108525     PISSN: 01432885     EISSN: 13652591     Source Type: Journal    
DOI: 10.1111/j.1365-2591.2009.01627.x     Document Type: Review

References (155)

1. Ahmad M, Pitt Ford TR, Crum LA (1987a) Ultrasonic debridement of root canals: acoustic streaming and its possible role. Journal of Endodontics 13, 490 9.
2. Ahmad M, Pitt Ford TR, Crum LA (1987b) Ultrasonic debridement of root canals: an insight into the mechanisms involved. Journal of Endodontics 13, 93 101.
3. Akpata ES, Blechman H (1982) Bacterial invasion of pulpal dentin wall in vitro. Journal of Dental Research 61, 435 8.
4. Aktener BO, Cengiz T, Piskin B (1989) The penetration of smear material into dentinal tubules during instrumentation with surface-active reagents: a scanning electron microscopic study. Journal of Endodontics 15, 588 90.
5. Alaam T (1987) Scanning electron microscope study comparing the efficacy of endodontic irrigating systems. International Endodontic Journal 20, 287 94.
6. Baker NA, Eleazer PD, Averbach RE, Seltzer S (1975) Scanning electron microscopic study of the efficacy of various irrigating solutions. Journal of Endodontics 1, 127 35.
7. Baker PJ, Evans RT, Coburn RA, Genco RJ (1983) Tetracycline and its derivatives strongly bind to and are released from the tooth surface in active form. Journal of Periodontology 54, 580 5.
8. Baker MC, Ashrafi SH, Van Cura JE, Remeikis NA (1988) Ultrasonic compared with hand instrumentation: a scanning electron microscope study. Journal of Endodontics 14, 435 40.
9. Barkhordar RA, Watanabe LG, Marshall GW, Hussain MZ (1997) Removal of intracanal smear by doxycycline in vitro. Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology and Endodontics 84, 420 3.
10. Barnes IE (1974) The production of inlay cavity bevels. British Dental Journal 137, 379 90.
11. Baumgartner JC, Cuenin PR (1992) Efficacy of several concentrations of sodium hypochlorite for root canal irrigation. Journal of Endodontics 18, 605 12.
12. Baumgartner JC, Mader CL (1987) A scanning electron microscopic evaluation of four root canal irrigation regimens. Journal of Endodontics 13, 147 57.
13. Baumgartner JC, Brown CM, Mader CL, Peters DD, Shulman JD (1984) A scanning electron microscopic evaluation of root canal debridement using saline, sodium hypochlorite, and citric acid. Journal of Endodontics 10, 525 31.
14. Behrend GD, Cutler CW, Gutmann JL (1996) An in-vitro study of smear layer removal and microbial leakage along root-canal fillings. International Endodontic Journal 29, 99 107.
15. Berg MS, Jacobsen EL, BeGole EA, Remeikis NA (1986) A comparison of five irrigating solutions: a scanning electron microscopic study. Journal of Endodontics 12, 192 7.
16. Berry EA III., von der Lehr WN, Herrin HK (1987) Dentin surface treatments for the removal of the smear layer: an SEM study. Journal of the American Dental Association 115, 65 7.
17. Biesterfeld RC, Taintor JF (1980) A comparison of periapical seals of root canals with RC-Prep or Salvizol. Oral Surgery, Oral Medicine and Oral Pathology 49, 532 7.
18. Bitter NC (1989) A 25% tannic acid solution as a root canal irrigant cleanser: a scanning electron microscope study. Oral Surgery, Oral Medicine and Oral Pathology 67, 333 7.
19. Bjorvatn K (1982) Antibiotic compounds and enamel demineralization. An in vitro study. Acta Odontologica Scandinavica 40, 341 52.
20. Brännström M (1984) Communication between the oral cavity and the dental pulp associated with restorative treatment. Operative Dentistry 9, 57 68.
21. Brännström M, Johnson G (1974) Effects of various conditioners and cleaning agents on prepared dentin surfaces: a scanning electron microscopic investigation. Journal of Prosthetic Dentistry 31, 422 30.
22. Brännström M, Nyborg H (1973) Cavity treatment with a microbicidal fluoride solution: growth of bacteria and effect on the pulp. Journal of Prosthetic Dentistry 30, 303 10.
23. Brännström M, Nordenvall KJ, Glantz P-O (1980) The effect of EDTA-containing surface-active solutions on the morphology of prepared dentin: an in vivo study. Journal of Dental Research 59, 1127 31.
24. Byström A, Sundqvist G (1981) Bacteriologic evaluation of the efficacy of mechanical root canal instrumentation in endodontic therapy. Scandinavian Journal of Dental Research 89, 321 8.
25. Byström A, Sundqvist G (1983) Bacteriologic evaluation of the effect of 0.5 percent sodium hypochlorite in endodontic therapy. Oral Surgery, Oral Medicine and Oral Pathology 55, 307 12.
26. Byström A, Sundqvist G (1985) The antibacterial action of sodium hypochlorite and EDTA in 60 cases of endodontic therapy. International Endodontic Journal 18, 35 40.
27. alt S, Serper A (2000) Smear layer removal by EGTA. Journal of Endodontics 26, 459 61.
28. Cameron JA (1983) The use of ultrasonics in the removal of the smear layer: a scanning electron microscope study. Journal of Endodontics 9, 289 92.
29. Cameron JA (1987a) The synergistic relationship between ultrasound and sodium hypochlorite: a scanning electron microscope evaluation. Journal of Endodontics 13, 541 5.
30. Cameron JA (1987b) The use of 4 per cent sodium hypochlorite, with or without ultrasound, in cleansing of uninstrumented immature root canals; SEM study. Australian Dental Journal 32, 204 13.
31. Cameron JA (1988) The use of ultrasound for the removal of the smear layer. The effect of sodium hypochlorite concentration; SEM study. Australian Dental Journal 33, 193 200.
32. Cengiz T, Aktener BO, Piskin B (1990) Effect of dentinal tubule orientation on the removal of smear layer by root canal irrigants. A scanning electron microscopic study. International Endodontic Journal 23, 163 71.
33. Cergneux M, Ciucchi B, Dietschi JM, Holz J (1987) The influence of the smear layer on the sealing ability of canal obturation. International Endodontic Journal 20, 228 32.
34. Chailertvanitkul P, Saunders WP, MacKenzie D (1996) The effect of smear layer on microbial coronal leakage of gutta-percha root fillings. International Endodontic Journal 29, 242 8.
35. Chandler NP, Lilley JD (1987) Clinical trial of a bis-dequalinium-acetate solution as an endodontic irrigant. Journal of Dental Research 66, 842.
36. Clark-Holke D, Drake D, Walton R, Rivera E, Guthmiller JM (2003) Bacterial penetration through canals of endodontically treated teeth in the presence or absence of the smear layer. Journal of Dentistry 31, 275 81.
37. Cobankara FK, Adanir N, Belli S (2004) Evaluation of the influence of smear layer on the apical and coronal sealing ability of two sealers. Journal of Endodontics 30, 406 9.
38. Cunningham WT, Martin H (1982) A scanning electron microscope evaluation of root canal débridement with the endosonic ultrasonic synergistic system. Oral Surgery, Oral Medicine and Oral Pathology 53, 527 31.
39. Cunningham WT, Martin H, Forrest WR (1982) Evaluation of root canal débridement by the endosonic ultrasonic synergistic system. Oral Surgery, Oral Medicine and Oral Pathology 53, 401 4.
40. Cymerman JJ, Jerome LA, Moodnik RM (1983) A scanning electron microscope study comparing the efficacy of hand instrumentation with ultrasonic instrumentation of the root canal. Journal of Endodontics 9, 327 31.
41. Czonstkowsky M, Wilson EG, Holstein FA (1990) The smear layer in endodontics. Dental Clinics of North America 34, 13 25.
42. Dederich DN, Zakariasen KL, Tulip J (1984) Scanning electron microscopic analysis of canal wall dentin following neodymium-yttrium-aluminum-garnet laser irradiation. Journal of Endodontics 10, 428 31.
43. De-Deus G, Reis C, Fidel S, Fidel R, Paciornik S (2007) Dentin demineralization when subjected to BioPure MTAD: a longitudinal and quantitative assessment. Journal of Endodontics 33, 1364 1368.
44. Drake DR, Wiemann AH, Rivera EM, Walton RE (1994) Bacterial retention in canal walls in vitro: effect of smear layer. Journal of Endodontics 20, 78 82.
45. Economides N, Liolios E, Kolokuris I, Beltes P (1999) Long-term evaluation of the influence of smear layer removal on the sealing ability of different sealers. Journal of Endodontics 25, 123 5.
46. Economides N, Kokorikos I, Kolokouris I, Panagiotis B, Gogos C (2004) Comparative study of apical sealing ability of a new resin-based root canal sealer. Journal of Endodontics 30, 403 5.
47. Eick JD, Wilko RA, Anderson CH, Sorensen SE (1970) Scanning electron microscopy of cut tooth surfaces and identification of debris by use of the electron microprobe. Journal of Dental Research 49 (Suppl 1359 68.
48. Evans JT, Simon JHS (1986) Evaluation of the apical seal produced by injected thermoplasticized gutta-percha in the absence of smear layer and root canal sealer. Journal of Endodontics 12, 100 7.
49. von der Fehr FR, Nygaard-Östby B (1963) Effect of EDTAC and sulfuric acid on root canal dentine. Oral Surgery, Oral Medicine and Oral Pathology 16, 199 205.
50. Foster KH, Kulild JC, Weller RN (1993) Effect of smear layer removal on the diffusion of calcium hydroxide through radicular dentin. Journal of Endodontics 19, 136 40.
51. Fraser JG (1974) Chelating agents: their softening effect on root canal dentin. Oral Surgery, Oral Medicine and Oral Pathology 37, 803 11.
52. von Fraunhofer JA, Fagundes DK, McDonald NJ, Dumsha TC (2000) The effect of root canal preparation on microleakage within endodontically treated teeth: an in vitro study. International Endodontic Journal 33, 355 60.
53. Froés JA, Horta HGP, da Silveira AB (2000) Smear layer influence on the apical seal of four different obturation techniques. Journal of Endodontics 26, 351 4.
54. Galvan DA, Ciarlone AE, Pashley DH, Kulild JC, Primack PD, Simpson MD (1994) Effect of smear layer removal on the diffusion permeability of human roots. Journal of Endodontics 20, 83 6.
55. Garberoglio R, Brännström M (1976) Scanning electron microscopic investigation of human dentinal tubules. Archives of Oral Biology 21, 355 62.
56. Genolu N, Samani S, Günday M (1993a) Dentinal wall adaptation of thermoplasticized gutta-percha in the absence or presence of smear layer: a scanning electron microscopic study. Journal of Endodontics 19, 558 62.
57. Genolu N, Samani S, Günday M (1993b) Evaluation of sealing properties of Thermafil and Ultrafil techniques in the absence or presence of smear layer. Journal of Endodontics 19, 599 603.
58. George S, Kishen A, Song KP (2005) The role of environmental changes on monospecies biofilm formation on root canal wall by Enterococcus faecalis. Journal of Endodontics 31, 867 72.
59. Ghoddusi J, Rohani A, Rashed T, Ghaziani P, Akbari M (2007) An evaluation of microbial leakage after using MTAD as a final irrigation. Journal of Endodontics 33, 173 176.
60. Gilboe DB, Svare CW, Thayer KE, Drennon DG (1980) Dentinal smearing: an investigation of the phenomenon. Journal of Prosthetic Dentistry 44, 310 6.
61. Goldberg F, Abramovich A (1977) Analysis of the effect of EDTAC on the dentinal walls of the root canal. Journal of Endodontics 3, 101 5.
62. Goldberg F, Spielberg C (1982) The effect of EDTAC and the variation of its working time analyzed with scanning electron microscopy. Oral Surgery, Oral Medicine and Oral Pathology 53, 74 7.
63. Goldberg F, Bernat MI, Spielberg C, Massone EJ, Piovano SA (1985) Analysis of the effect of ethylenediaminetetraacetic acid on the apical seal of root canal fillings. Journal of Endodontics 11, 544 7.
64. Goldberg F, Soares I, Massone EJ, Soares IM (1988) Comparative debridement study between hand and sonic instrumentation of the root canal. Endodontics and Dental Traumatology 4, 229 34.
65. Goldberg F, Artaza LP, De Silvio A (1995) Apical sealing ability of a new glass ionomer root canal sealer. Journal of Endodontics 21, 498 500.
66. Goldman LB, Goldman M, Kronman JH, Lin PS (1981) The efficacy of several irrigating solutions for endodontics: a scanning electron microscopic study. Oral Surgery, Oral Medicine and Oral Pathology 52, 197 204.
67. Goldman M, Goldman LB, Cavaleri R, Bogis J, Lin PS (1982) The efficacy of several endodontic irrigating solutions: a scanning electron microscopic study: Part 2. Journal of Endodontics 8, 487 92.
68. Goya C, Yamazaki R, Tomita Y, Kimura Y, Matsumoto K (2000) Effects of pulsed Nd:YAG laser irradiation on smear layer at the apical stop and apical leakage after obturation. International Endodontic Journal 33, 266 71.
69. Griffiths BM, Stock CJR (1986) The efficiency of irrigants in removing root canal debris when used with ultrasonic preparation technique. International Endodontic Journal 19, 277 84.
70. Guerisoli DMZ, Marchesan MA, Walmsley AD, Lumley PJ, Pecora JD (2002) Evaluation of smear layer removal by EDTAC and sodium hypochlorite with ultrasonic agitation. International Endodontic Journal 35, 418 21.
71. Gutmann JL (1993) Adaptation of injected thermoplasticized gutta-percha in the absence of the dentinal smear layer. International Endodontic Journal 26, 87 92.
72. Haapasalo M, Ørstavik D (1987) In vitro infection and disinfection of dentinal tubules. Journal of Dental Research 66, 1375 9.
73. Harashima T, Takeda FH, Zhang C, Kimura Y, Matsumoto K (1998) Effect of argon laser irradiation on instrumented root canal walls. Endodontics and Dental Traumatology 14, 26 30.
74. Haznedaroglu F, Ersev H (2001) Tetracycline HCl solution as a root canal irrigant. Journal of Endodontics 27, 738 40.
75. Jodaikin A, Austin JC (1981) Smear layer removal with chelating agents after cavity preparation. Journal of Prosthetic Dentistry 46, 171 4.
76. Karagöz-Küükay I, Bayirli G (1994) An apical leakage study in the presence and absence of the smear layer. International Endodontic Journal 27, 87 93.
77. Kaufman AY (1981) The use of dequalinium acetate as a disinfectant and chemotherapeutic agent in endodontics. Oral Surgery, Oral Medicine and Oral Pathology 51, 434 41.
78. Kaufman AY (1983a) Solvidont - a new chemotherapeutic and bacteriocidal agent for endodontic use (I). Quintessence International 14, 71 9.
79. Kaufman AY (1983b) Solvidont - a new chemotherapeutic and bacteriocidal agent for endodontic use (II). Quintessence International 14, 235 44.
80. Kaufman AY, Greenberg I (1986) Comparative study of the configuration and the cleanliness level of root canals prepared with the aid of sodium hypochlorite and bis-dequalinium-acetate solutions. Oral Surgery, Oral Medicine and Oral Pathology 62, 191 7.
81. Kaufman AY, Binderman I, Tal M, Gedalia I, Peretz G (1978) New chemotherapeutic agent for root canal treatment. A preliminary electron microscopic study on an in vivo and in vitro endodontically treated tooth. Oral Surgery, Oral Medicine and Oral Pathology 46, 283 95.
82. Kennedy WA, Walker WA III., Gough RW (1986) Smear layer removal effects on apical leakage. Journal of Endodontics 12, 21 7.
83. Kimura Y, Yonaga K, Yokoyama K, Kinoshita J, Ogata Y, Matsumoto K (2002) Root surface temperature increase during Er:YAG laser irradiation of root canals. Journal of Endodontics 28, 76 8.
84. Koskinen KP, Meurman JH, Stenvall H (1980) Appearance of chemically treated root canal walls in the scanning electron microscope. Scandinavian Journal of Dental Research 88, 397 405. (Pubitemid 11214230)
85. Lester KS, Boyde A (1977) Scanning electron microscopy of instrumented, irrigated and filled root canals. British Dental Journal 143, 359 67.
86. Lilley JD, Russell C, Chandler NP (1988) Comparison of bis-dequalinium-acetate and sodium hypochlorite solutions as endodontic irrigants. Journal of Dental Research 67, 300.
87. Lloyd A, Thompson J, Gutmann JL, Dummer PMH (1995) Sealability of the Trifecta technique in the presence or absence of a smear layer. International Endodontic Journal 28, 35 40.
88. Loel DA (1975) Use of acid cleanser in endodontic therapy. Journal of the American Dental Association 90, 148 51.
89. Love RM, Chandler NP, Jenkinson HF (1996) Penetration of smeared or nonsmeared dentine by Streptococcus gordonii. International Endodontic Journal 29, 2 12.
90. Lui J-N, Kuah H-G, Chen N-N (2007) Effects of EDTA with and without surfactants or ultrasonics on removal of smear layer. Journal of Endodontics 33, 472 5.
91. Lumley PJ, Walmsley AD, Walton RE, Rippin JW (1992) Effect of precurving endosonic files on the amount of debris and smear layer remaining in curved root canals. Journal of Endodontics 18, 616 9.
92. Lussi A, Nussbächer U, Grosrey J (1993) A novel noninstrumented technique for cleansing the root canal system. Journal of Endodontics 19, 549 53.
93. Mader CL, Baumgartner JC, Peters DD (1984) Scanning electron microscopic investigation of the smeared layer on root canal walls. Journal of Endodontics 10, 477 83.
94. Madison S, Krell KV (1984) Comparison of ethylenediamine tetraacetic acid and sodium hypochlorite on the apical seal of endodontically treated teeth. Journal of Endodontics 10, 499 503.
95. Martin H, Cunningham MJ (1983) Endosonic endodontics, the ultrasonic synergistic system. In : Gerstein H, ed. Techniques in Clinical Endodontics. Philadelphia, PA, USA : WB Saunders, 316 22.
96. Martin H, Cunningham WT, Norris JP, Cotton WR (1980) Ultrasonic versus hand filing of dentin: a quantitative study. Oral Surgery, Oral Medicine and Oral Pathology 49, 79 81.
97. McComb D, Smith DC (1975) A preliminary scanning electron microscopic study of root canals after endodontic procedures. Journal of Endodontics 1, 238 42.
98. McComb D, Smith DC, Beagrie GS (1976) The results of in vivo endodontic chemomechanical instrumentation-a scanning electron microscopic study. Journal of the British Endodontic Society 9, 11 8.
99. Meryon SD, Brook AM (1990) Penetration of dentine by three oral bacteria in vitro and their associated cytotoxicity. International Endodontic Journal 23, 196 202.
100. Meryon SD, Jakeman KJ, Browne RM (1986) Penetration in vitro of human and ferret dentine by three bacterial species in relation to their potential role in pulpal inflammation. International Endodontic Journal 19, 213 20.
101. Meryon SD, Tobias RS, Jakeman KJ (1987) Smear removal agents: a quantitative study in vivo and in vitro. Journal of Prosthetic Dentistry 57, 174 9.
102. Michelich VJ, Schuster GS, Pashley DH (1980) Bacterial penetration of human dentin in vitro. Journal of Dental Research 59, 1398 403.
103. Mohd Sulong MZA (1989) The incidence of postoperative pain after canal preparation of open teeth using two irrigation regimes. International Endodontic Journal 22, 248 51.
104. Moodnik RM, Dorn SO, Feldman MJ, Levey M, Borden BG (1976) Efficacy of biomechanical instrumentation: a scanning electron microscopic study. Journal of Endodontics 2, 261 6.
105. Moorer WR, Wesselink PR (1982) Factors promoting the tissue dissolving capability of sodium hypochlorite. International Endodontic Journal 15, 187 96.
106. Morgan LA, Baumgartner JC (1997) Demineralization of resected root-ends with methylene blue dye. Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology and Endodontics 84, 74 8.
107. Moshonov J, Sion A, Kasirer J, Rotstein I, Stabholz A (1995) Efficacy of argon laser irradiation in removing intracanal debris. Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology and Endodontics 79, 221 5.
108. Okan T, Aktener BO, en BH, Tezel H (1993) The penetration of root canal sealers into dentinal tubules. A scanning electron microscopic study. International Endodontic Journal 26, 301 5.
109. Olgart L, Brännström M, Johnson G (1974) Invasion of bacteria into dentinal tubules. Experiments in vivo and in vitro. Acta Odontologica Scandinavica 32, 61 70.
110. 2 laser radiation on root canals with AgCl fibers: a scanning and transmission electron microscopic study. Journal of Endodontics 19, 272 6.
111. Ørstavik D, Haapasalo M (1990) Disinfection by endodontic irrigants and dressings of experimentally infected dentinal tubules. Endodontics and Dental Traumatology 6, 142 9.
112. Outhwaite WC, Livingston MJ, Pashley DH (1976) Effects of changes in surface area, thickness, temperature and post-extraction time on human dentine permeability. Archives of Oral Biology 21, 599 603.
113. Park DS, Torabinejad M, Shabahang S (2004) The effect of MTAD on the coronal leakage of obturated root canals. Journal of Endodontics 30, 890 2.
114. Pashley DH (1984) Smear layer: physiological considerations. Operative Dentistry Supplement 3, 13 29.
115. Pashley DH (1985) Dentin-predentin complex and its permeability: physiologic overview. Journal of Dental Research 64 Spec Iss, 613 20.
116. Pashley DH (1992) Smear layer: overview of structure and function. Proceedings of the Finnish Dental Society 88 (Suppl 1 215 24.
117. Pashley DH, Depew DD (1986) Effects of the smear layer, Copalite, and oxalate on microleakage. Operative Dentistry 11, 95 102.
118. Pashley DH, Michelich V, Kehl T (1981) Dentin permeability: effects of smear layer removal. Journal of Prosthetic Dentistry 46, 531 7.
119. Pashley DH, Tao L, Boyd L, King GE, Horner JA (1988) Scanning electron microscopy of the substructure of smear layers in human dentine. Archives of Oral Biology 33, 265 70.
120. Pashley DH, Depew DD, Galloway SE (1989) Microleakage channels: scanning electron microscopic observation. Operative Dentistry 14, 68 72.
121. Perez F, Calas P, Rochd T (1996) Effect of dentin treatment on in vitro root tubule bacterial invasion. Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology and Endodontics 82, 446 51.
122. Prati C, Selighini M, Ferrieri P, Mongiorgi R (1994) Scanning electron microscopic evaluation of different endodontic procedures on dentin morphology of human teeth. Journal of Endodontics 20, 174 9.
123. Rubin LM, Skobe Z, Krakow AA, Gron P (1979) The effect of instrumentation and flushing of freshly extracted teeth in endodontic therapy: a scanning electron microscope study. Journal of Endodontics 5, 328 35.
124. Ruddle CJ (2007) Hydrodynamic disinfection: tsunami endodontics. Dentistry Today 26 (5 114 7.
125. Sabbak SA, Hassanin MB (1998) A scanning electron microscopic study of tooth surface changes induced by tannic acid. Journal of Prosthetic Dentistry 79, 169 74.
126. Safavi KE, Spngberg LSW, Costa NS Jr., Sapounas G (1989) An in vitro method for longitudinal evaluation of toxicity of endodontic sealers. Journal of Endodontics 15, 484 6.
127. Safavi KE, Spngberg LSW, Langeland K (1990) Root canal dentinal tubule disinfection. Journal of Endodontics 16, 207 10.
128. Saleh IM, Ruyter IE, Haapasolo M, Ørstavik D (2008) Bacterial penetration along different root canal filling materials in the presence or absence of smear layer. International Endodontic Journal 41, 32 40.
129. Saunders WP, Saunders EM (1992) The effect of smear layer upon the coronal leakage of gutta-percha root fillings and a glass ionomer sealer. International Endodontic Journal 25, 245 9.
130. Saunders WP, Saunders EM (1994) Influence of smear layer on the coronal leakage of Thermafil and laterally condensed gutta-percha root fillings with a glass ionomer sealer. Journal of Endodontics 20, 155 8.
131. Schmid R, Reilley C (1957) New complexion for titration of calcium in the presence of magnesium. Annals of Chemistry 29, 264 8.
132. Shahravan A, Haghdoost AA, Adl A, Rahimi H, Shadifar F (2007) Effect of smear layer on sealing ability of canal obturation: a systematic review and meta-analysis. Journal of Endodontics 33, 96 105.
133. van der Sluis LWM, Versluis M, Wu MK, Wesselink PR (2007) Passive ultrasonic irrigation of the root canal: a review of the literature. International Endodontic Journal 40, 415 26.
134. Stabholz A, Neev J, Liaw LH, Stabholz A, Khayat A, Torabinejad M (1993) Effect of ArF-193 nm excimer laser on human dentinal tubules. A scanning electron microscopic study. Oral Surgery, Oral Medicine and Oral Pathology 75, 90 4.
135. Stewart GG, Kapsimalas P, Rappaport H (1969) EDTA and urea peroxide for root canal preparation. Journal of the American Dental Association 78, 335 8.
136. Takeda FH, Harashima T, Kimura Y, Matsumoto K (1998a) Comparative study about the removal of smear layer by three types of laser devices. Journal of Clinical and Laser Medical Surgery 16, 117 22.
137. Takeda FH, Harashima T, Kimura Y, Matsumoto K (1998b) Efficacy of Er:YAG laser irradiation in removing debris and smear layer on root canal walls. Journal of Endodontics 24, 548 51.
138. Takeda FH, Harashima T, Kimura Y, Matsumoto K (1999) A comparative study of the removal of smear layer by three endodontic irrigants and two types of laser. International Endodontic Journal 32, 32 9.
139. Taylor JK, Jeansonne BG, Lemon RR (1997) Coronal leakage: effects of smear layer, obturation technique, and sealer. Journal of Endodontics 23, 508 12.
140. Tewfik HM, Pashley DH, Horner JA, Sharawy MM (1993) Structural and functional changes in root dentin following exposure to KTP532 laser. Journal of Endodontics 19, 492 7.
141. Tidmarsh BG (1978) Acid-cleansed and resin-sealed root canals. Journal of Endodontics 4, 117 21.
142. Tidswell HE, Saunders EM, Saunders WP (1994) Assessment of coronal leakage in teeth root filled with gutta-percha and a glass of ionomer root canal sealer. International Endodontic Journal 27, 208 12.
143. Timpawat S, Sripanaratanakul S (1998) Apical sealing ability of glass ionomer sealer with and without smear layer. Journal of Endodontics 24, 343 5.
144. Timpawat S, Vongsavan N, Messer HH (2001) Effect of removal of the smear layer on apical microleakage. Journal of Endodontics 27, 351 3.
145. Torabinejad M, Khademi AA, Babagoli J et al. (2003) A new solution for the removal of the smear layer. Journal of Endodontics 29, 170 5.
146. Vassiliadis L, Liolios E, Kouvas V, Economides N (1996) Effect of smear layer on coronal microleakage. Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology and Endodontics 82, 315 20.
147. Walker TL, del Rio CE (1989) Histological evaluation of ultrasonic and sonic instrumentation of curved root canals. Journal of Endodontics 15, 49 59.
148. Walker TL, del Rio CE (1991) Histological evaluation of ultrasonic debridement comparing sodium hypochlorite and water. Journal of Endodontics 17, 66 71.
149. Wayman BE, Kopp WM, Pinero GJ, Lazzari EP (1979) Citric and lactic acids as root canal irrigants in vitro. Journal of Endodontics 5, 258 65.
150. White RR, Goldman M, Lin PS (1984) The influence of the smeared layer upon dentinal tubule penetration by plastic filling materials. Journal of Endodontics 10, 558 62.
151. White RR, Goldman M, Lin PS (1987) The influence of the smeared layer upon dentinal tubule penetration by endodontic filling materials. Part II. Journal of Endodontics 13, 369 74.
152. Wikesjö UM, Baker PJ, Christersson LA et al. (1986) A biochemical approach to periodontal regeneration: tetracycline treatment conditions dentin surfaces. Journal of Periodontal Research 21, 322 9.
153. Williams S, Goldman M (1985) Penetrability of the smeared layer by a strain of Proteus vulgaris. Journal of Endodontics 11, 385 8.
154. Yamada RS, Armas A, Goldman M, Lin PS (1983) A scanning electron microscopic comparison of a high volume final flush with several irrigating solutions: Part 3. Journal of Endodontics 9, 137 42.
155. Yang SE, Bae KS (2002) Scanning electron microscopy study of the adhesion of Prevotella nigrescens to the dentin of prepared root canals. Journal of Endodontics 28, 433 7.