Wilhelm Conrad Röntgen on 8 November 1895.

The invisible ray named in honor of Roentgen’s findings.

Roentgen was the first person to radiograph the human body by placing his wife’ s(Anna Bertha) hand on photogenic plate and exposing it for 15 min.

  • Otto Walkhoff completed first dental radiograph after 25 mins exposure on 14th January 1896.
  • Image obtained of crown of maxillary and mandibular teeth thus the first “Bitewing” was taken.
  • Otto Walkhoff and Fritz established First dental roentgenologic laboratory 1896.
  • Prof. Wilhelm Koenig on 2nd February 1896 made a series of 14 dental radiographs in his own mouth that required 9 minutes of exposure.
  • First to advocate the importance of keeping the film and object at right angles to the source of x-rays using film holder.
  • First dentist to use radiograph in root canal therapy: May 10, 1899
  • Kells became one of the early martyrs who fell victim to the harmful effect of radiation injuries.

Dr.C. Edmund Kells demonstrated the method of taking radiograph which is called skigraph.

William Herbert Rollins is known as forgotten man of dentistry.

William Herbert Rollins in 1922.

MI Pupin discovered the intensifying screen.

J Trowbridge built the first oil immersed x-ray tube.

E Rutherford discovered the alpha and beta rays.

P Villard discovered the gamma rays.

Weston Price designed the celluloid base dental film.

WJ Morton has taken first dental radiograph using skull in United States.

Dr Cieszynski unaware of Price’s work also applied the rule of isometry to intra oral radiography in 1907. Later it was called as Cieszynski’s rule of isometry.

  • WD Coolidge discovered the hot cathode tube in 1913.
  • In 1918 Coolidge introduced a tube with the protection built in a leaded glass tube with a lime glass window to serve as the port for useful x-ray beam.

A tube in which the vacuum was too low was said to be “soft” and one in which it was too high to operate properly was called “hard”.

H L Sayen developed the self –regulating tube in 1897.

Eastman Kodak Company developed the first dental x-ray film.

The first machine wrapped dental x-ray film packet called “Regular film”( Radia-tized, [Kodak]) became commercially available in 1919.

  • In 1940 Ultra-speed (improved Radia-tized) film became available in market.
  • The speed of both (Radia-tized & improved Radia-tized)film again improved by factor of about 8 in 1955.

Ekta- speed film first introduced in early 1981.

  • G Bucky developed the grid called as Bucky Diaphragm in 1915.
  • HE Potter modified the Bucky grid and it is called Potter-Bucky diaphragm.

The first dental x-ray machine was manufactured by Victor X-ray Corporation in 1923.

H R Raper introduced the bitewing radiography.

Howard Riley Raper was the first person to introduce the undergraduate course in dental radiology.

Principle of panoramic radiography was first described by Numata and independently by Paatero.

Felix Bloch and Edward Purcell in 1946.

Automatic film processor developed in 1960.

Xeroradiography discovered in 1956.

In 1896, French scientist Henri Becquerel discovered natural radioactivity.

Kodak In sight dental film, a new F-speed film, introduced in 2000, using patented T-Grain film technology has demonstrated image that are quality characteristics better than Kodak E-Plus film.

Harrison first reported the occurrence of radiation injuries in July 1896.

William Herbert Rollins was first to urge the use of filters to remove the dangerous low energy x-ray from beam in 1903 which went unnoticed until George Pfahler in 1906 recognized it.

  • Franklin W Mc Cormack was the graduate medical x-ray technician.
  • In 1911 he opened one of the first dental X-ray laboratories in San Fransico.
  • He was the first person to put parallel principle in the use of intra oral radiography.
  • Paralleling technique.
  • Bisecting technique.
  • Digital imaging.
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  7. Issrani R Intraoral X-Ray Films- A Walk Through History RRJDS 2017;5:8-11.
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