References
1.
Ngeow WC. Is there a “safety zone” in the mandibular
premolar region where damage to the mental nerve
can be avoided if periapical extrusion occurs? J Can
Dent Assoc. 2010;76:a61.
2. Phillips JL, Weller RN, Kulild JC. The mental foramen:
2. Radiographic position in relation to the mandibular
second premolar. J Endod. 1992;18(6):271-274.
3. Knowles KI, Jergenson MA, Howard JH. Paresthesia
associated with endodontic treatment of mandibular
premolars. J Endod. 2003;29(11):768-770.
4. Denio D, Torabinejad M, Bakland LK. Anatomical
relationship of the mandibular canal to its
surrounding structures in mature mandibles. J Endod.
1992;18(4):161-165.
5. Bürklein S, Grund C, Schäfer E. Relationship between
root apices and the mandibular canal: A cone-
beam computed tomographic analysis in a German
population. J Endod. 2015;41(10):1696-1700.
6. Ngeow WC. Lower lip numbness due to peri-radicular
dental infection. Med J Malaysia. 1998; 53(4): 446-448.
7. Poveda R, Bagan JV, Fernandez JM, Sanchis JM.
Mental nerve paresthesia associated with endodontic
paste within the mandibular canal: report of a case.
Oral Surg Oral Med Oral Pathol Oral Radiol Endod.
2006;102(5):e46-49.
8. Pogrel MA. Damage to the inferior alveolar nerve
as the result of root canal therapy. J Am Dent Assoc
2007;138(1):65-69.
9. 9. Di Lenarda R, Cadenaro M, Stacchi C. Paresthesia
of the mental nerve induced by periapical infection: a
case report. Oral Surg Oral Med Oral Pathol Oral Radiol
Endod. 2000;90(6):746-749.
10. Pertot WJ, Camps J, Remusat M, Proust JP. In vivo
comparison of the biocompatibility of two root canal
sealers implanted into the mandibular bone of rabbits.
Oral Surg Oral Med Oral Pathol. 1992;73(5):613-620.
11. Morse DR. Endodontic-related inferior alveolar nerve
12.
13.
14.
15.
16.
17.
18.
19.
and mental foramen paresthesia. Compend Contin
Educ Dent 1997;18(10):963-8, 70-3, 76-8 passim; quiz
98.
Ngeow WC, Yuzawati Y. The location of the mental
foramen in a selected Malay population. J Oral Sci.
2003;45(3):171-175.
Scarano A, Di Carlo F, Quaranta A, Piattelli A. Injury
of the inferior alveolar nerve after overfilling of the
root canal with endodontic cement: a case report.
Oral Surg Oral Med Oral Pathol Oral Radiol Endod.
2007;104(1):e56-59.
Grotz KA, Al-Nawas B, de Aguiar EG, Schulz A, Wagner
W. Treatment of injuries to the inferior alveolar nerve
after endodontic procedures. Clin Oral Investig.
1998;2(2):73-76.
Scolozzi P, Lombardi T, Jaques B. Successful inferior
alveolar nerve decompression for dysesthesia following
endodontic treatment: report of 4 cases treated by
mandibular sagittal osteotomy. Oral Surg Oral Med
Oral Pathol Oral Radiol Endod. 2004;97(5):625-631.
Tilotta-Yasukawa F, Millot S, El Haddioui A, Bravetti P,
Gaudy JF. Labiomandibular paresthesia caused by
endodontic treatment: an anatomic and clinical study.
Oral Surg Oral Med Oral Pathol Oral Radiol Endod.
2006;102(4):e47-59.
Scheid RC, Weiss G. Woelfel’s Dental anatomy: Its
relevance to Dentistry. 8th ed. Chapter 3: Basis
terminology for understanding tooth morphology.
Philadelphia, PA: Lippincott Williams & Wilkins; 2012.
Ngeow WC, Dionysius DD, Ishak H, Nambiar P. Effect
of ageing towards location and visibility of mental
foramen on panoramic radiographs. Singapore Dental
Journal. 2010;31(1):15-19.
Yosue T, Brooks SL. The appearance of mental
foramina on panoramic and periapical radiographs.
II. Experimental evaluation. Oral Surg Oral Med Oral
Pathol. 1989;68(4):488-492.
A RADIOGRAPHIC STUDY TO DETERMINE THE POSSIBLE EXISTENCE OF A “SAFE ZONE” AGAINST
ENDODONTIC PERIAPICAL EXTRUSION IN THE LOWER PREMOLAR
Questions
1. Which tooth is usually closely related to the mental foramen?
qa. First premolar;
qb. Second premolar;
qc. First molar;
qd. Second molar.
2. Which of the following statements is not the main principle of endodontic treatment?
qa. Eliminating pain;
qb. Eliminating infection in pulp and dentine;
qc. Achieving adequate intracanal preparation;
qd. Achieving proper seal.
3. The following is not a factor that contributes to the occurrence of neurosensory disturbance
during endodontic treatment of the mandibular premolars:
qa. Mechanical;
qb. Chemical;
qc. Thermal;
qd. Psychological.
4. When translating the finding that 96% of mental foramina were found to be located within
one-crown distance from the apex, how far are the majority of the mental foramina located
within from the apices of the second premolar?
qa. 6 mm;
qb. 7 mm;
qc. 8 mm;
qd. 9 mm.
A RADIOGRAPHIC STUDY TO DETERMINE THE POSSIBLE EXISTENCE OF A “SAFE ZONE” AGAINST
ENDODONTIC PERIAPICAL EXTRUSION IN THE LOWER PREMOLAR
Wei Cheong NGEOW
BDS (Mal), FFDRCS (Ire), FDSRCS (Eng), MDSc (Mal)
PhD (Sheffield), FAMM, Professor Dr
Department of Oral & Maxillofacial Clinical Sciences
Faculty of Dentistry, University of Malaya
Kuala Lumpur, Malaya
CV
Professor Dr Wei Cheong Ngeow graduated from the Faculty of Dentistry of the University of Malaya
in 1992 and went into private practice before being offered a tutorship at his alma matter. In 1996, he
obtained his Fellowship in Dental Surgery from the Royal Colleges of Surgeons in Ireland and England,
respectively. Back in Malaysia he was a pioneer lecturer at the newly established Universiti Kebangsaan
Malaysia. He returned to private practice in 1999 but in 2000 returned to the University of Malaya He
obtained an MDSc (2008) and a PhD from the University of Sheffield (2010). He has published over
160 articles, letters, comments and reports in local and international journals, and was the Editor of the
Malaysian Dental Journal (2005-2007) and Editor of the MDA Newsletter (2015). His research interests
are craniofacial anthropometry, variations of the mandibular nerve, recovery of peripheral nerves after
microsurgical repair.
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