ommunicating maxillary anterior to the dental technician , DDS, Dearborn,
MDS,
and Francine
F. Dietsh,
contour
for
DDS
Mich.
The shape, size, contour, and tooth proportions of a maxillary fixed prosthesis result often from the sole design of the dental technmian.
LO/4/28378
tooth
The guidelines established for anterior tooth selection in removable prosthodontics are well organized. Many anterior tooth shapes exist and include square, ovoid, square ovoid, tapering, square tapering, and square tapering ovoid. In addition, denture tooth proportions are variable. Anterior denture teeth mold charts may be used in fixed
Fig. 1. Arrangement charts help communicate tooth shape and proportions and minor variation in setup. (Reproduced with permission from “Individualized anterior arrangements of Trubyte Bioblend teeth” DentsplyiYork Division, Dentsply International, York, Pa.)
Fig. 2. Fixed prosthesis on anterior implant and posterior natural teeth abutments. Pink porcelain and denture tooth size and shape selection customize fixed restoration for esthetic final result. 278
FEBRUARY
1992
VOLUME
67
NUMBER
2
TIPS
FROM
OUR
READERS
prosthodontics to effectively communicate desired information to the technician. The prominence of the canines and minor rotations or variations of incisal edge position can also be communicated with the anterior denture teeth mold and modified arrangement charts (Fig. 1) (Dentsply/ York Division, York, Pa.). A more ideal wax-up of the final tooth form results before the 2 mm cut back for tbe metal substructure. An implant abutment is particularly difficult to restore in the maxillary anterior region, because the diameter of the abutment post is only 4 mm and anterior labial and/or vertical bone loss is common. An anterior white wax-up over the metal framework at the metal try-in permits the dentist to evaluate lip support and high lip line during smiling. If the teeth appear too long, pink porcelain can be shaded to match the gingiva and the denture tooth size selected for customized tooth proportions (Figs. 2 and 3). Reprint
Fig. 3. Completed restoration
rization Con Jooste,
MChD,
in patient’s mouth.
of acrylic
resin
requests to:
DR. CARL E. MISCH 22691 MICHIGAN AVE. DEARBORN, MI 48124
denture
teeth
PhDa
University of Stellenbosch, School of Dentistry, Tygerberg, Republic of South Africa Stock artificial teeth asprovided by manufacturers have a uniformity of color and shade,inherent to their production, that doesnot impart a natural esthetic result to dentures. Methods have been developed for making acrylic resin teeth by incorporating staining and characterization to natural denture teeth.i, 2 These methods usethe molds of natural teeth to achieve the desired result. Surface stains applied to artificial teeth are of a temporary nature and the effect is soonlost in the oral environment. A procedure wasdeveloped for using internal staining of stock acrylic resin denture teeth to provide an esthetic and natural appearance.
4. Extend the initial channel thus created to simulate a surfaceof hypocalcification, cervical and interproximal staining, or a restoration. 5. Flow intensive light-curing compositeresin stains(Kulzer & Co., Wehrheim, Germany) of the desiredcolorsinto the channelswith a blunt probe, 6. When creating a check line, adapt the stain to the depth of the fissure by drawing a celluloid strip through it. 7. Evaluate these characterizations and correct them if necessarybefore curing with a white light system. The intact layer of enamel-coloredacrylic resin imparts
PROCEDUR
1. Use round burs in sizes2 to 4 and thin diamond disks to create the desired characterizations. 2. Obtain accessfrom the posterior surface of the denture teeth in the region that will be covered by heat-cured acrylic resin during processing.Use slow-rotating instruments to control the depth of these features. 3. The channelscreated in the tooth shouldjust penetrate the dentin body color without perforating the labial or interproximal surfacesof the tooth (Fig. 1). The burs or disks can be seen as greyish spots or lines when they penetrate the body color. aProfessor andDirector, Departmentof THE
JOURNAL
Dental
Prosthetics.
Fig.
10/4/26182 OF PROSTHETIC
DENTISTRY
1. Depth of characterization region. 279
MDS,
and Francine
F. Dietsh,
contour
for
DDS
Mich.
The shape, size, contour, and tooth proportions of a maxillary fixed prosthesis result often from the sole design of the dental technmian.
LO/4/28378
tooth
The guidelines established for anterior tooth selection in removable prosthodontics are well organized. Many anterior tooth shapes exist and include square, ovoid, square ovoid, tapering, square tapering, and square tapering ovoid. In addition, denture tooth proportions are variable. Anterior denture teeth mold charts may be used in fixed
Fig. 1. Arrangement charts help communicate tooth shape and proportions and minor variation in setup. (Reproduced with permission from “Individualized anterior arrangements of Trubyte Bioblend teeth” DentsplyiYork Division, Dentsply International, York, Pa.)
Fig. 2. Fixed prosthesis on anterior implant and posterior natural teeth abutments. Pink porcelain and denture tooth size and shape selection customize fixed restoration for esthetic final result. 278
FEBRUARY
1992
VOLUME
67
NUMBER
2
TIPS
FROM
OUR
READERS
prosthodontics to effectively communicate desired information to the technician. The prominence of the canines and minor rotations or variations of incisal edge position can also be communicated with the anterior denture teeth mold and modified arrangement charts (Fig. 1) (Dentsply/ York Division, York, Pa.). A more ideal wax-up of the final tooth form results before the 2 mm cut back for tbe metal substructure. An implant abutment is particularly difficult to restore in the maxillary anterior region, because the diameter of the abutment post is only 4 mm and anterior labial and/or vertical bone loss is common. An anterior white wax-up over the metal framework at the metal try-in permits the dentist to evaluate lip support and high lip line during smiling. If the teeth appear too long, pink porcelain can be shaded to match the gingiva and the denture tooth size selected for customized tooth proportions (Figs. 2 and 3). Reprint
Fig. 3. Completed restoration
rization Con Jooste,
MChD,
in patient’s mouth.
of acrylic
resin
requests to:
DR. CARL E. MISCH 22691 MICHIGAN AVE. DEARBORN, MI 48124
denture
teeth
PhDa
University of Stellenbosch, School of Dentistry, Tygerberg, Republic of South Africa Stock artificial teeth asprovided by manufacturers have a uniformity of color and shade,inherent to their production, that doesnot impart a natural esthetic result to dentures. Methods have been developed for making acrylic resin teeth by incorporating staining and characterization to natural denture teeth.i, 2 These methods usethe molds of natural teeth to achieve the desired result. Surface stains applied to artificial teeth are of a temporary nature and the effect is soonlost in the oral environment. A procedure wasdeveloped for using internal staining of stock acrylic resin denture teeth to provide an esthetic and natural appearance.
4. Extend the initial channel thus created to simulate a surfaceof hypocalcification, cervical and interproximal staining, or a restoration. 5. Flow intensive light-curing compositeresin stains(Kulzer & Co., Wehrheim, Germany) of the desiredcolorsinto the channelswith a blunt probe, 6. When creating a check line, adapt the stain to the depth of the fissure by drawing a celluloid strip through it. 7. Evaluate these characterizations and correct them if necessarybefore curing with a white light system. The intact layer of enamel-coloredacrylic resin imparts
PROCEDUR
1. Use round burs in sizes2 to 4 and thin diamond disks to create the desired characterizations. 2. Obtain accessfrom the posterior surface of the denture teeth in the region that will be covered by heat-cured acrylic resin during processing.Use slow-rotating instruments to control the depth of these features. 3. The channelscreated in the tooth shouldjust penetrate the dentin body color without perforating the labial or interproximal surfacesof the tooth (Fig. 1). The burs or disks can be seen as greyish spots or lines when they penetrate the body color. aProfessor andDirector, Departmentof THE
JOURNAL
Dental
Prosthetics.
Fig.
10/4/26182 OF PROSTHETIC
DENTISTRY
1. Depth of characterization region. 279
