A Laboratory Based Investigation of a New Elastic Toothbrush Head

Table 1

Description of each tested model.

Gypsum model	Description
1	Upper bridge 13–16 and 23–25; diastema  12-11-21-22.
2	Lower bridge 34–37  and  44–47.
3	Severe chronic periodontitis: clinical  crown  lengthening  with  the  opening  of  dental  spaces  and  many  diastemata; 27  furcation  exposed;  23  inclined;  26  missed.
4	Severe chronic periodontitis: clinical  crown  lengthening  with  the  opening  of  dental  spaces  and  many  diastemata; 46  furcation  exposed;  36-37  missed.
5	Orthodontic braces; diastemata  12-13-14  and  23-24.
6	13-12-21-22  rotated  for crowding of the teeth; 16  slightly  extruded.
7	Crowding of the teeth ,  33  highly displaced; 43  missed;  36  slightly  extruded  with enlargement of interdental space; furcation  exposed  on  36  and  46.
8	Wide  diastemata  between  all  teeth.
9	Diastemata  35-36,  33-34,  42-43,  and  43-44.
10	Crowding of the teeth ;  32  highly displaced.
11	Orthodontic braces.
12	Crown  on  36;  bridge  44–47;  34  missed; periodontitis with gingival recessions; 32-33  lingual  inclined.
13-14	Ideal  dental  disposition.  Absence  of  any  anatomical  variations;  all  teeth  present  except  the  third  molars.