History of Oral and Maxillofacial Radiology

Question 1

Who discovered x-radiation by accident in November 1895?

Answer 1

Wilhelm Conrad Von Roentgen

Question 2

Multiple studies with Hittorf and Crookes on…

Answer 2

cathode ray tubes

Question 3

What did Wilhelm Conrad Von Roentgen do?

Answer 3

• Discovered x-radiation
• Generated cathode rays from glass cathode bulbs
• Also generated a different type of ray with unusual properties – the “X” ray

Question 4

How did Wilhelm Conrad Von Roentgen discover x-radiation?

Answer 4

• had covered his vacuum tube with black cardboard
• coated another piece of cardboard with crystals of barium-platino-cyanide
• the barium-platino-cyanide screen began to glow brilliantly on the other side of the room
• when he held his hand between the tube and the screen it created a shadowgraph of his hand

Question 5

When was the first known x-ray taken of Wilhelm’s wife’s hand?

Answer 5

December 28th, 1895

Question 6

When was the hand of alfred von kolliker’s hand x-rayed at the Wurzburg Physico-medical society?

Answer 6

January 23, 1896

Question 7

How were x-ray machines powered when they were first created?

Answer 7

rheostat

Question 8

Wilhelm Conrad Von Roentgen received the first Nobel Prize in physics in _____ for the discovery of X-radiation

Answer 8

1901

Question 9

Who was the dentist in Braunschweig, Germany, produced the first dental radiographs less than two weeks after Roentgen’s announcement of the “X”-ray discovery?

Answer 9

Otto Walkhoff

Question 10

How did Otto Walkhoff take the first dental x-ray?

Answer 10

He placed a small glass photographic plate coated with rubber dam in his own mouth, then seated himself for a twenty-five minute exposure

Question 11

When did Otto Walkhoff take the first dental x-ray?

Answer 11

January 12, 1896

Question 12

Dental radiograph taken by physicist Dr. _________ on February 1, 1896

Answer 12

Walter König

Question 13

How long were Dr. Walter König exposure times?

Answer 13

maxillary about 9 minutes
mandibular about 5 minutes

Question 14

Who invented the first surgical aspirator for dental and medical surgery?

Answer 14

Dr. C. Edmund Kells

Question 15

Who was one of the first dentists to hire a female dental assistant?

Answer 15

Dr. C. Edmund Kells

Question 16

Who was the first to expose a dental radiograph in the United States?

Answer 16

Dr. C. Edmund Kells

Question 17

What did Dr. C. Edmund Kells do?

Answer 17

• Invented first surgical aspirator for dental and medical surgery
• one of the first dentists to hire a female dental assistant
• first to expose a dental radiograph in the United States

Question 18

Why did radiology workers used to have prematurely aged hands and cancer on the hands?

Answer 18

Adjusting the energy of the beam of x-radiation by testing it on their own hands

Question 19

What did William David Coolidge do?

Answer 19

Modified the x-ray tube for portability for W.W.I. MASH units in France

Question 20

Who modified the x-ray tube for portability?

Answer 20

William David Coolidge

Question 21

What did Coolidge’s modified x-ray tube for portability lead to?

Answer 21

Became the prototype for the enclosed x-ray tube

Question 22

Coolidge’s modified x-ray tube is had ___________ design change over the decades

Answer 22

minimal

Question 23

When did the hand-held dental x-ray unit start being used?

Answer 23

2005