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Clinical Research| Volume 45, ISSUE 10, P1209-1218, October 2019
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Analysis of Fused Rooted Maxillary First and Second Molars with Merged and
C-shaped Canal Configurations: Prevalence, Characteristics, and Correlations in
a Saudi Arabian Population
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ANALYSIS OF FUSED ROOTED MAXILLARY FIRST AND SECOND MOLARS WITH MERGED AND
C-SHAPED CANAL CONFIGURATIONS: PREVALENCE, CHARACTERISTICS, AND CORRELATIONS IN
A SAUDI ARABIAN POPULATION

 * Mohammed Mashyakhy, BDS, MSc
   Mohammed Mashyakhy
   Correspondence
   Address requests for reprints to Dr Mohammed Mashyakhy, Department of
   Restorative Dental Sciences, College of Dentistry, Jazan University Kingdom
   of Saudi Arabia, PO Box 114, Jazan, Saudi Arabia.
   Contact
   Affiliations
   Department of Restorative Dental Sciences, College of Dentistry, Jazan
   University, Jazan, Saudi Arabia
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 * Hemant Ramesh Chourasia, BDS, MDS
   Hemant Ramesh Chourasia
   Affiliations
   Department of Restorative Dental Sciences, College of Dentistry, Jazan
   University, Jazan, Saudi Arabia
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 * Ahmad Jabali, BDS, MS
   Ahmad Jabali
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   Department of Restorative Dental Sciences, College of Dentistry, Jazan
   University, Jazan, Saudi Arabia
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 * Abdulmajeed Almutairi, BDS, AEGD, SBRD
   Abdulmajeed Almutairi
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   Dental Department, Alkharj Armed Forced Hospital, Al Kharj, Saudi Arabia
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   Gianluca Gambarini
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Published:August 01, 2019DOI:https://doi.org/10.1016/j.joen.2019.06.009
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ABSTRACT


INTRODUCTION

The aims of this in vivo cone-beam computed tomographic (CBCT) study were to
evaluate the prevalence, characteristics, and correlations between the fused
rooted maxillary first and second molars as well as their consequent merged and
C-shaped canals in a Saudi Arabian population.


METHODS

CBCT imaging of 726 maxillary first and second molars from 208 subjects of Saudi
origin were evaluated in the present study. The prevalence of fused rooted
maxillary molars, merged canals, C-shaped configurations, and correlations
between the presence of fused rooted teeth between first and second molars were
examined as the primary outcome. Differences by sex, location in the jaw, and
bilateral symmetry (similarity between right- and left-side teeth in the same
patient) were evaluated as the secondary outcome. The Z test was used for
differences in the independent proportions, the chi-square test was used for
differences between sex and locations, and the Cohen kappa test was used for
bilateral symmetry. The kappa test was also used for intrarater reliability. A
value of P < .05 was considered significant.


RESULTS

The prevalence of fused rooted maxillary first and second molars was 7% and 21%,
respectively. Within fused rooted teeth, the presence of merged canals was 8.3%
and 32.1%, whereas the prevalence of C-shaped canals was 8.3% and 5.1% in first
and second maxillary molars, respectively. Among 57 subjects who had fused
rooted maxillary molars, 19.3% showed a correlation between first and second
molars. In fused rooted maxillary molars, 3.8% first molars and 13% second
molars were bilaterally symmetrical. There were no statistically significant
differences between sexes and right- and left-sided fused rooted maxillary
molars, merged canals, or C-shaped canals.


CONCLUSIONS

Maxillary second molars presented more complex external and internal morphology
compared with maxillary first molars, with an overall prevalence of 14% of fused
rooted maxillary molars and 3.7% merged and 0.8% C-shaped canal configurations
for all maxillary molars. The clinician should be aware of such challenges, and
for a better treatment outcome, the use of CBCT imaging (small field of view)
and an operative dental microscope can be considered when a preoperative
periapical radiograph shows signs of fused rooted maxillary molars.


KEY WORDS

 * Cone-beam computed tomography
 * C shaped
 * fused rooted molars
 * merged canals
 * morphology


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ARTICLE INFO


PUBLICATION HISTORY

Published online: August 01, 2019


IDENTIFICATION

DOI: https://doi.org/10.1016/j.joen.2019.06.009


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© 2019 American Association of Endodontists.


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We use cookies which are necessary to make our site work. We may also use
additional cookies to analyse, improve and personalise our content and your
digital experience. For more information, see our Cookie Policy and the list of
Google Ad-Tech Vendors.

You may choose not to allow some types of cookies. However, blocking some types
may impact your experience of our site and the services we are able to offer.
See the different category headings below to find out more or change your
settings.

You may also be able to exercise your privacy choices as described in our
Privacy Policy
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STRICTLY NECESSARY COOKIES

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or alert you about these cookies, but some parts of the site will not then work.
These cookies do not store any personally identifiable information.



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FUNCTIONAL COOKIES

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These cookies enable the website to provide enhanced functionality and
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PERFORMANCE COOKIES

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TARGETING COOKIES

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These cookies may be set through our site by our advertising partners. They may
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