EXTERNAL ROOT RESORPTION OF THE SECOND MOLAR ASSOCIATEDWITH MESIALLY IMPACTED MANDIBULAR THIRD MOLAR FROM CONBEAM COMPUTED TOMOGRAPHY

The Assessors of the Asian University Network - Quality Assurance (AUN-QA) are warmly welcomed!

Welcome to the Vietnamese Doctors’ Day!

Abstract:

MANDIBULAR 

THIRD MOLAR 

FROM CONBEAM 

COMPUTED TOMOGRAPHY

Objective:

Describe   the   rela

tionship   between 

morphologically misaligned wisdom teeth and extrinsic 

resorption  of  the  mandibular  second  molar  roots  on 

*

Trường Đại học Y Hà Nội

Chịu trách nhiệm chính: 

Trần Thiện Tiến

Email: 

Thientien0210199

5

@gmail.com

Ngày nhận bài: 

19.8.2022

Ngày phản biện khoa học: 

22.9.2022

Ngày duyệt bài: 

7.10.2022

Conbeam CT film.

Materials

and methods:

Patients 

come for dental health examination or diseases related 

to   the   maxillofacial   region   at

the   Department   of 

Odonto

-

Stomatology, 

Hanoi 

Medical 

University 

Hospital   and   the   Center   for   High

-

Tech   Dental 

Examination   and   Treatment,   Institute   of   Odonto

-

Stomatology  ,  Hanoi  Medical  University,  was  assigned 

to  take  CT  Conbeam  film,  on  the  film  appeared  t

he

image  of  extrinsic  resorption  of  the  roots  of  the 

mandibular  second  molars  because  the  lower  wisdom 

teeth  were  included  in  the  study  sample.  Research 

method:    Cross

-

sectional,    prospective,    convenient 

sample  selection,  patients  with  CT  Conbeam  films 

satis

fying  the  selection  criteria  were  included  in  the 

study  sample.

Results

:  Out  of  120  patients  included 

in   the   study   sample   including   120   CT   Conbeam 

images,  122  roots  of  the  mandibular  second  molars 

were  found  to  have  extradilation,  in  terms  of  the 

location 

of the appearance, the rate of extraresorption 

was high. The highest was at the position of 1/3 of the 

neck  with  82  teeth  (67.2%),  followed  by  the  position 

of  the  middle  third  of  31  teeth  (25.4%),  and  the 

lowest was at the position of the apical 1/3 consis

ting of 

9  teeth  (7.4%).  Regarding  the  degree  of  external 

resorption,  there  were  66  teeth  (54.1%)  with  mild 

diarrhea, 44 teeth (36.1%) with moderate and 12 teeth 

(9.8%) with severe. The most common location of root 

extrinsic  resorption  is  the  cervical  1/3  a

nd  the  middle 

1/3  of  the  root.  Severe  externalities  were  common  in 

the  apical  third,  while  mild  and  moderate  cases  were 

predominantly   in   the   cervical   and   mid

-

root   thirds. 

Conclusion:

There   is   a   relationship   between   the 

position  of  the  extrinsic  position  of

the  root  of  the 

mandibular   second   molar   tooth   and   the   eruption 

position  of  the  mandibular  wisdom  tooth  according  to 

the classification of Pell and Gregory. The severity of the 

extrinsic root loss is related to the external position. root 

resorption, while

the severity of external root resorption 

was not related to the age group of the patient.

Keywords:

cone

-

beam     CT

,

External     root 

resorption

,

Impacted third molar

I

.

ĐẶT VẤN ĐỀ

Ngoại tiêu chân răng là một quá trình bệnh lý 

xảy ra ở bên ngoài bề mặt của châ

n răng, gây 

nên bởi tình trạng viêm hoặc các yếu tố cơ học. 

Các nghiên cứu gần đây đã chỉ ra một số yếu tố 

dẫn đến ngoại tiêu chân răng như: áp lực cơ học 

từ các răng mọc xung quanh, nhiễm trùng nha 

chu, chấn thương, các lực cơ học dịch chuyển 

răng  trong  c

hỉnh  nha,  cắm  lại  răng,  hoặc  các 

khối  u,  nang  trong  quá  trình  phát  triển  gây 

nên

1

...

Ngoại  tiêu  chân  răng  có  thể  làm  ảnh 

hưởng đến chức năng của răng hàm lớn thứ hai, 

nhẹ thì theo dõi và không cần điều

trị gì, nặng 

THIRD MOLAR 

FROM CONBEAM 

COMPUTED TOMOGRAPHY

Objective:

Describe   the   rela

tionship   between 

morphologically misaligned wisdom teeth and extrinsic 

resorption  of  the  mandibular  second  molar  roots  on 

*

Trường Đại học Y Hà Nội

Chịu trách nhiệm chính: 

Trần Thiện Tiến

Email: 

Thientien0210199

5

@gmail.com

Ngày nhận bài: 

19.8.2022

Ngày phản biện khoa học: 

22.9.2022

Ngày duyệt bài: 

7.10.2022

Conbeam CT film.

Materials

and methods:

Patients 

come for dental health examination or diseases related 

to   the   maxillofacial   region   at

the   Department   of 

Odonto

-

Stomatology, 

Hanoi 

Medical 

University 

Hospital   and   the   Center   for   High

-

Tech   Dental 

Examination   and   Treatment,   Institute   of   Odonto

-

Stomatology  ,  Hanoi  Medical  University,  was  assigned 

to  take  CT  Conbeam  film,  on  the  film  appeared  t

he

image  of  extrinsic  resorption  of  the  roots  of  the 

mandibular  second  molars  because  the  lower  wisdom 

teeth  were  included  in  the  study  sample.  Research 

method:    Cross

-

sectional,    prospective,    convenient 

sample  selection,  patients  with  CT  Conbeam  films 

satis

fying  the  selection  criteria  were  included  in  the 

study  sample.

Results

:  Out  of  120  patients  included 

in   the   study   sample   including   120   CT   Conbeam 

images,  122  roots  of  the  mandibular  second  molars 

were  found  to  have  extradilation,  in  terms  of  the 

location 

of the appearance, the rate of extraresorption 

was high. The highest was at the position of 1/3 of the 

neck  with  82  teeth  (67.2%),  followed  by  the  position 

of  the  middle  third  of  31  teeth  (25.4%),  and  the 

lowest was at the position of the apical 1/3 consis

ting of 

9  teeth  (7.4%).  Regarding  the  degree  of  external 

resorption,  there  were  66  teeth  (54.1%)  with  mild 

diarrhea, 44 teeth (36.1%) with moderate and 12 teeth 

(9.8%) with severe. The most common location of root 

extrinsic  resorption  is  the  cervical  1/3  a

nd  the  middle 

1/3  of  the  root.  Severe  externalities  were  common  in 

the  apical  third,  while  mild  and  moderate  cases  were 

predominantly   in   the   cervical   and   mid

-

root   thirds. 

Conclusion:

There   is   a   relationship   between   the 

position  of  the  extrinsic  position  of

the  root  of  the 

mandibular   second   molar   tooth   and   the   eruption 

position  of  the  mandibular  wisdom  tooth  according  to 

the classification of Pell and Gregory. The severity of the 

extrinsic root loss is related to the external position. root 

resorption, while

the severity of external root resorption 

Keywords:

cone

-

beam     CT

,

External     root 

resorption

,

Impacted third molar

I

.

ĐẶT VẤN ĐỀ

Ngoại tiêu chân răng là một quá trình bệnh lý 

xảy ra ở bên ngoài bề mặt của châ

n răng, gây 

nên bởi tình trạng viêm hoặc các yếu tố cơ học. 

Các nghiên cứu gần đây đã chỉ ra một số yếu tố 

dẫn đến ngoại tiêu chân răng như: áp lực cơ học 

từ các răng mọc xung quanh, nhiễm trùng nha 

chu, chấn thương, các lực cơ học dịch chuyển 

răng  trong  c

hỉnh  nha,  cắm  lại  răng,  hoặc  các 

khối  u,  nang  trong  quá  trình  phát  triển  gây 

nên

1

...

Ngoại  tiêu  chân  răng  có  thể  làm  ảnh 

hưởng đến chức năng của răng hàm lớn thứ hai, 

nhẹ thì theo dõi và không cần điều

trị gì, nặng 