Page 23 - My FlipBook
P. 23
:
the intense heat required to fuse the porcelain in a short time may cause
the generation of gas faster than it can escape.
The pioneers of dentistry who began the development of dental
porcelain were more skillful in its manipulation than most of us at the
present time. They were required to grind their materials, solve their
formulie and compound their ingredients. They were also required to
carve gum section blocks and other special fonns of teeth, and thus
developed an art that is almost lost to the dental profession to-day. The
technique of performing experimental operations with porcelain develops
the opeiator's skill in its manipulation and thus assists him in perform-
ing his practical operations. Experimental work in the laboratory is not
a waste of time, but helps one to become more familiar with the subject.
The difficulty with many beginners is their unwillingness to devote that
time to experimental work which is required to obtain a thorough knowl-
edge of the properties of porcelain and the general principles of manipu-
lating it.
Jldt^atttagcs and Disadvantages. Indications and Contra-
indications of Porcelain Iniavs.
Before studying the methods of constructing porcelain inlays, let us
consider their advantages and disadvantages, their indications and contra-
indications.
The advantages of porcelain as a filling material are
1. Fillings can be inserted which more nearly harmonize with the
natural teeth.
2. Porcelain is a poor conductor of thermal and a non-conductor of
electrical changes.
3. The margins of cavities properly filled with porcelain, are not
readily attacked by caries.
4. The cement used as a retaining medium causes the filling to have
the greatest adhesion of any of the filling materials except cement.
5. The patient is relieved of sitting with the rubber dam adjusted
over the mouth for periods of considerable length, and of the pain inci-
dent to adjusting the rubber dam and cervical clamps for cavities extend-
ing beneath the gum.
6. The nervous strain of both patient and dentist is lessened, thereby
relieving the patient of the shock which usually follows long, tedious
operations.
19
the intense heat required to fuse the porcelain in a short time may cause
the generation of gas faster than it can escape.
The pioneers of dentistry who began the development of dental
porcelain were more skillful in its manipulation than most of us at the
present time. They were required to grind their materials, solve their
formulie and compound their ingredients. They were also required to
carve gum section blocks and other special fonns of teeth, and thus
developed an art that is almost lost to the dental profession to-day. The
technique of performing experimental operations with porcelain develops
the opeiator's skill in its manipulation and thus assists him in perform-
ing his practical operations. Experimental work in the laboratory is not
a waste of time, but helps one to become more familiar with the subject.
The difficulty with many beginners is their unwillingness to devote that
time to experimental work which is required to obtain a thorough knowl-
edge of the properties of porcelain and the general principles of manipu-
lating it.
Jldt^atttagcs and Disadvantages. Indications and Contra-
indications of Porcelain Iniavs.
Before studying the methods of constructing porcelain inlays, let us
consider their advantages and disadvantages, their indications and contra-
indications.
The advantages of porcelain as a filling material are
1. Fillings can be inserted which more nearly harmonize with the
natural teeth.
2. Porcelain is a poor conductor of thermal and a non-conductor of
electrical changes.
3. The margins of cavities properly filled with porcelain, are not
readily attacked by caries.
4. The cement used as a retaining medium causes the filling to have
the greatest adhesion of any of the filling materials except cement.
5. The patient is relieved of sitting with the rubber dam adjusted
over the mouth for periods of considerable length, and of the pain inci-
dent to adjusting the rubber dam and cervical clamps for cavities extend-
ing beneath the gum.
6. The nervous strain of both patient and dentist is lessened, thereby
relieving the patient of the shock which usually follows long, tedious
operations.
19
