EXPLANATIONS FOR THE 16 MCQ

[Guest guest]

HI ALL

I WILL START POSTING THE EXPLANTIONS TO THE 16 MCQ POSTED EARLIER

I WOULD LOVE TO HEAR UR FEEDBACKS AND ANY CORRECTIONS

((((( THE ANSWRS PRESENTED EXPLAINES MY OPINION FOR THE SELECTION THEY COULD BE

WRONG))))))

SO UR FEEDBACKS WOULD BE MUCH APPRECIATED

11. A 40 yr old patient had root-canal treatment to his upper first molar. This

was performed 6 months ago using contemporary techniques under rubber dam and

was crowned after completion of treatment. He attends complaining of continued

discomfort from this tooth. Radiographic examination shows each of the three

roots to be obturated with a well-condensed filling to the full working length

though there is no evidence of in-fill of the periapical lesion when compared to

the pre-op view. There is crestal bone loss and no furcal involvement. What is

the most likely cause of the continued problem?

A. Extra-radicular infection

B. Contamination of canal(s) with E.faecalis

C. Uninstrumented canal

D. Vertical root fracture

E. Perio-endo problem

ANSWER IS C

) Why did they choose upper " First " molar and not any other tooth in the human

mouth? It's because MB2 are 90% there and usually missed.

2) E.faecalis is a serious problem but he told you that a rubber dam was placed

& the case is a treatment and not Re-treatment. E.fatalistic is a problem with

Re-treatments mainly.

3) Vertical Root fracture is a problem always seen with long standing RCT teeth

and not in 6 month ones. Also they said that he had never felt better.

4) Not Extra-radicular infection too as they said he had a proper endo i.e.

proper irrigation and they also said the canals are well obturated. In addition

they said he had a crown so no coronal leakage is taking place.

5) Crestal bone loss can sometimes happen when there are lateral canals (Coronal

Lateral Anatomy) connected with a missed canal i.e. bacteria/acids are moving

from the Mb2 to the bone causing loss of attachment and subsequently loss of

crestal bone.

PLEASE GIVE ME UR FEEDBACKS

BEST REGARDS

EBTISAM

[Guest guest]

Thanks for the explanation. From: ebtessam <ebtessamhamalawy@...> Sent: Thursday, 29 March 2012 12:33 AM Subject: EXPLANATIONS FOR THE 16 MCQ

HI ALL

I WILL START POSTING THE EXPLANTIONS TO THE 16 MCQ POSTED EARLIER

I WOULD LOVE TO HEAR UR FEEDBACKS AND ANY CORRECTIONS

((((( THE ANSWRS PRESENTED EXPLAINES MY OPINION FOR THE SELECTION THEY COULD BE WRONG))))))

SO UR FEEDBACKS WOULD BE MUCH APPRECIATED

11. A 40 yr old patient had root-canal treatment to his upper first molar. This was performed 6 months ago using contemporary techniques under rubber dam and was crowned after completion of treatment. He attends complaining of continued discomfort from this tooth. Radiographic examination shows each of the three roots to be obturated with a well-condensed filling to the full working length though there is no evidence of in-fill of the periapical lesion when compared to the pre-op view. There is crestal bone loss and no furcal involvement. What is the most likely cause of the continued problem?

A. Extra-radicular infection

B. Contamination of canal(s) with E.faecalis

C. Uninstrumented canal

D. Vertical root fracture

E. Perio-endo problem

ANSWER IS C

) Why did they choose upper "First" molar and not any other tooth in the human mouth? It's because MB2 are 90% there and usually missed.

2) E.faecalis is a serious problem but he told you that a rubber dam was placed & the case is a treatment and not Re-treatment. E.fatalistic is a problem with Re-treatments mainly.

3) Vertical Root fracture is a problem always seen with long standing RCT teeth and not in 6 month ones. Also they said that he had never felt better.

4) Not Extra-radicular infection too as they said he had a proper endo i.e. proper irrigation and they also said the canals are well obturated. In addition they said he had a crown so no coronal leakage is taking place.

5) Crestal bone loss can sometimes happen when there are lateral canals (Coronal Lateral Anatomy) connected with a missed canal i.e. bacteria/acids are moving from the Mb2 to the bone causing loss of attachment and subsequently loss of crestal bone.

PLEASE GIVE ME UR FEEDBACKS

BEST REGARDS

EBTISAM