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At least 1,513 records · Page 84Linked to original sources
PubMed1998

A clinical study on abutment taper and height of full cast crown preparations.

Dental students at Tokyo Medical and Dental University are taught to prepare teeth for full cast crowns with a wall taper of 2 to 5 degrees and an occlusal clearance of 1.2 to 1.5 mm. However, it is difficult to achieve such an ideal taper. The objective of this study was to examine the abutment taper and height of teeth prepared for crowns by final-year dental students under clinical supervision. To evaluate the degree of taper and height of the prepared teeth, shadowgraphs of 63 working stone dies were traced. The angles and height of the abutments were then measured on the same tracing. Only 12.7% (8 out of 63 abutments) of the prepared teeth fell within the ideal range of 2 to 5 degrees, and the average taper was 9.5 degrees (19.0 degrees convergence angle). The average abutment height varied from 4.8 mm to 6.9 mm and showed a close relationship with the abutment taper. The average taper, 9.5 degrees, of the present study was larger than the ideal taper; however, it was thought to be clinically acceptable as it is difficult to achieve the ideal taper intraorally.

Crowns↗
PubMed2000

Cast posts that fit at first try.

The following article describes a procedure that permits the retention of a cast post that will fit passively in the canal at first try. By means of an indirect method, an elastic cast was poured in the master impression and an exact duplicate of the future dowel was formed with self-curing acrylic resin. A stone cast made from a second pour of the impression was then used to adjust the pattern in the laboratory. Posts made with the use of this system routinely sit passively in the root canal without the need of adjustments at the chair. The interval employed in obtaining and adjusting an acrylic resin pattern mentioned in the above way represents less time and effort than trying to make a cast fit in the canal, especially in the case of patients who require multiple posts in the same arch.

Acrylic Resins↗
PubMed2000

Customized abutments to shape and transfer peri-implant soft-tissue contours.

With the functional successes of implant therapy being realized, the emphasis is shifting to the creation of tooth-like esthetics with implant therapy. Dental implants are placed after careful planning and site preparation, which may include bone and soft tissue grafting. The final soft tissue appearance is enhanced through the early use of provisional restorations. A combination technique is described to fabricate provisional healing abutments for cement-on prostheses and to transfer the individualized peri-implant soft-tissue contours to the dental laboratory. This technique will allow the practitioner to deliver highly customized implant care with familiar techniques and readily available materials.

Dental Abutments↗
PubMed2000

[Analysis of maxillary dental-arch dimensions in adult unoperated cleft palate patients].

OBJECTIVE: Analysis of maxillary dental-arch development in adult unoperated cleft palate patients. METHODS: Dental casts was studied in 20 cases of adult unoperated cleft palate (UCP) patients, and 20 cases of normal adults were as a control group. RESULTS: The UCP group showed smaller dental-arch widths than a control group in the canine region (P < 0.05) and these was no significant difference on upper-arch depth and posterior dental arch widths between the UCP group and a control group (P > 0.05). CONCLUSION: In the UCP group major deformity were in incisor and canine region, and smaller interfere to posterior dental-arch widths and depth. Operation for cleft lip can interfere maxillary dental-arch development.

Adolescent↗
PubMed2003

A clinical evaluation of the agar alginate combined impression: dimensional accuracy of dies by new master crown technique.

PURPOSE: To evaluate the dimensional accuracy of several impression methods including agar alginate combined impression in vivo; the marginal accuracy of stone dies was determined using a new electroformed master crown technique. MATERIALS AND METHODS: Cast cores with knife-edge and chamfer margins and electroformed master crowns were fabricated for 3 patients. Five impressions were taken of each preparation, using agar alginate combined impression and silicone impression materials. Dies were made after impression. The marginal fit of the master crown on each die was analyzed by four-way analysis of variance (ANOVA) and Tukey HSD test (p<0.05). RESULTS: The marginal fit of the master crown on the dies with chamfer margin was better than those with knife-edge margin for agar alginate combined impression. The shape of the margin did not affect the accuracy when silicone impression material was used. CONCLUSIONS: The results suggest that the agar alginate impression method is clinically acceptable for the chamfer margin, but shape of the margin may affect the dimensional accuracy of dies. The shape of the margin does not affect the accuracy of dies when silicone impression was used. Furthermore, the master crown made by electroforming technique could be useful for clinical evaluation of impression methods.

Agar↗