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At least 289 records · Page 16Linked to original sources
PubMed1991

Clinical applicability of the radiographic method for determining the thickness of calcified crown tissues.

A previously developed radiologic method for determining the thickness of the mineralized crown tissues was applied clinically to 10 teeth diagnosed for extraction. The thickness of the mineralized crown tissues as measured radiographically was compared with that measured directly on the extracted tooth. A statistical analysis indicated accuracy of 4.46%, equivalent to an error of 0.12 mm.

Dental Cementum↗
PubMed1992

Denture tooth selection: an analysis of the natural maxillary central incisor compared to the length and width of the face. Part I.

A project was devised by the removable prosthodontic faculty to determine clinically if there is a correlation between the length and width of the maxillary central incisor on a cast and the length and width of the face. A millimeter gauge was used to measure the lengths and widths of the maxillary incisor on a cast. The Trubyte tooth indicator was selected to measure the length and width of the face. This tooth indicator is designed for calibration of the 16 to 1 ratio between facial dimension and maxillary central incisors.

Adult↗
PubMed1994

Denture tooth selection: size matching of natural anterior tooth width with artificial denture teeth.

This project, conducted by the Removable Prosthodontic faculty, compared the mesiodistal widths of the six maxillary anterior teeth with the widths of denture teeth from six different denture tooth manufacturers. Four hundred eighty-eight casts of dental students were measured from the distal aspect of each canine across the facial surfaces of the six anterior teeth with a flexible plastic millimeter rule. Denture teeth from six manufacturers were compared (370 molds). The results indicated that denture teeth are predominantly smaller and natural teeth are larger.

Cuspid↗
PubMed1975

Comparison of apical sealing methods. A preliminary report.

A comparison of the seal provided by gutta-percha root canal filling, heat-sealed gutta-percha, retrograde amalgam filling, and retrograde Durelon filling was made by observation of dye penetration around the above filling materials in extracted teeth. A small but not significant difference between gutta-percha, heat-sealed gutta-percha, and retrograde amalgam was noted. Retrograde Durelon filling gave a poor seal in comparison to gutta-percha and retrograde amalgam filling, but the difference between it and the heat seal was not significant.

Apicoectomy↗
PubMed1978

An unusual triad: microdontia, taurodontia, and dens invaginatus.

A 12 1/2-year-old white boy was examined and found to have permanent teeth that were smaller than those of the average adult. The microdontia was accompanied by taurodontia of the mandibular molars and several teeth with dens invaginatus. The patient was normal in appearance and had no other illness. The pedigree was compatible with X-linked recessive inheritance.

Child↗
PubMed1979

Determination of tooth length with a standardized paralleling technique and calibrated radiographic measuring film.

A simple radiographic measuring method is presented. Fifty teeth to be extracted were radiographed by means of a standardized paralleling technique and a preprinted intraoral radiographic film. The measuring grid was conveyed to the film as a latent pattern by a stenciling process prior to the x-ray exposure. The distance between the measuring lines was adjusted in accordance with the image magnification. The length of the teeth was read directly on the completed radiograph. The extracted teeth were measured by means of a sliding caliper. A statistical analysis of the data indicated that the present method is more accurate than other clinical methods commonly used for determination of tooth lengths.

Dental Instruments↗
PubMed1979

The length of teeth. A statistical analysis of the differences in length of human teeth for radiologic purposes.

Intraoral radiograms can be made according to the long tube paralleling technique utilizing aiming devices. An important factor in the design of these instruments is the length of the teeth to be radiographed. Reliable data regarding the length of the teeth in the different regions of the mouth are not available. Information on the length of teeth was therefore collected by measuring 1,400 extracted teeth. A statistical analysis of the data finally resulted for each region of the mouth and for both sexes in length value which could be used for the design of aiming devices.

Bicuspid↗
PubMed1980

Precision measurement control in endodontics.

A technique for measurement control in endodontic therapy is presented. The technique, which involves the use of a 10 mm segment of plastic ruler mounted on the end of a mirror handle, eliminates the inaccuracies associated with rubber stops and other devices used for measurement control. It gives the dentist precision control of instrumentation, which is vital to the development of a dentinal matrix at an optimum position.

Calibration↗
PubMed1980

Comparison of endodontic measurement controls using a paralleling technique with a grid and a conventional measurement.

Pretreatment radiographs were taken using a paralleling device and measurement grid. The measurement controls obtained in that manner in 60 teeth were compared to measurements obtained from conventional radiographs taken during endodontic treatment. This study was undertaken to test the proposal that pretreatment radiographs taken with a paralleling device and measurement grid would make further radiographs for that purpose unnecessary, thus reducing patients' exposure to ionizing radiation.

Dental Pulp Cavity↗
PubMed1981

The relationship between crown size and the incidence of bifid root canals in mandibular incisor teeth.

From an initial sample of 729 extracted mandibular incisor teeth a final sample of 286 (172 central and 114 lateral incisors) was used to determine if any relationship existed between crown size, expressed as the M-D/F-L index, and the presence of bifid canals within the root of the tooth. The M-D/F-L index was calculated for each tooth and was matched against the presence of bifid canals as determined from radiographs of the lateral aspect of the teeth. The results indicate that bifid canals occur more frequently in teeth with the smaller M-D/F-L index and from regression equations, which had a high coefficient of correlation, the indications are that the incidence of bifid canals among the teeth with the lowest M-D/F-L index could be as high as 70 percent.

Dental Pulp Cavity↗
PubMed1983

Clinical evaluation of a new method for determining tooth length without radiographs.

A new instrument (the Apexfinder) for measuring tooth length was recently introduced for use in endodontics. The procedure of measuring tooth length with this instrument was found to be simple and easy. It also eliminated the need for radiographs, with their problems. One hundred forty-two teeth were used to compare the new method with two different methods, widely used in endodontics, that employ radiographs. The investigation showed that the new technique offers a direct method for measuring the distance between the coronal and apical ends of the tooth. Statistical analysis of the data indicated that the new method was superior to the others. The Apexfinder was accurate in 90 percent of the cases. When radiographs were used, the results were accurate in 75 percent of the cases, while the use of the radiograph and the tooth-length formula gave 60.4 percent accuracy.

Adult↗
PubMed1984

Reproducibility of radiographs with the orthopantomograph 5: tooth-length assessment.

The precision of tooth-length assessments based on repeated panoramic radiographs made with a Siemens OP 5 was investigated in three groups of twenty patients. Two exposures of the same patient were made under three different radiographic conditions. Of the tooth lengths, nonmeasurability was found in 14% to 17%. The variability (standard deviation) of the measurements assessed from repeated radiographs ranged from 0.65 to 0.85 mm, or 2.4% to 3.1% of the mean radiographic tooth length in the different patient groups. The measurement error ranged from 0.43 to 0.56 mm, indicating that the main source of error inherent in the method was recognition of the reference points. Small differences were found between the tooth groups and between the right and left sides.

Adolescent↗
PubMed1986

A scanning electron microscopic investigation of accessory foramina in the furcation and pulp chamber floor of molar teeth.

Observations of the pulp chamber floor and furcation surface of human maxillary and mandibular first and second molars were made with the scanning electron microscopic to determine the incidence, size, and location of patent accessory foramina. Accessory foramina on both the pulp chamber floor and the furcation surface were found in 36% of maxillary first molars, 12% of maxillary second molars, 32% of mandibular first molars, and 24% of mandibular second molars. Mandibular teeth had a higher incidence (56%) of foramina involving both the pulp chamber floor and furcation surface than did the maxillary teeth (48%).

Dental Pulp Cavity↗