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At least 181 records · Page 10Linked to original sources
PubMed1975

Mesiodistal crown dimension of the permanent dentition of American Negroes.

A study of the mesiodistal crown dimension was conducted on the teeth of 162 American Negroes, equally divided between males and females. A total of 3,980 teeth were measured. Teeth were measured from the plaster casts by means of Boley gauges. The sample was drawn from a growth study, private practice, and a dental clinic. The mean width of the teeth of males and females was reported. The teeth of males were larger than those of females for each type of tooth in both arches, although they exhibited a similar pattern of tooth size. The maxillary first premolars were larger than the second premolars, while the mandibular second premolars were larger than the first premolars. The first molars were larger than the second molars in both the maxillary and mandibular arches in both sexes. The ratio of the mandibular dentition ot the maxillary dentition was 94 per cent in both sexes. The ratio of the sum of the widths of the canines and incisors of the mandibular dentition to those of the maxillary dentition was 77 per cent. Also, the ratio of the mandibular incisors to the maxillary incisors was 71 per cent in both sexes.

Black People↗
PubMed1977

Tooth-size discrepancy in mandibular prognathism.

A Bolton analysis of seventy-eight cases of Angle Class III malocclusion, twenty-six cases of Angle Class I malocclusion, and twenty-six cases of Angle Class II malocclusion was recorded. Frequency of excess mandibular tooth structure, magnitude of the excess, over-all ratios, and anterior segment ratios were computed and analyzed. Two clinical cases were presented to show the advantage of tooth-size harmony in mandibular prognathism. Analysis of the data as presented above suggests the following conclusions: 1. The frequency of mandibular tooth-size excess (over-all ratio) in this sample was greater in cases of mandibular prognathism than in Angle Class I and Angle Class II cases. 2. In those cases with mandibular tooth-size excess, there was a suggestion that the magnitude of the excess was greater in cases of mandibular prognathism than in Angle Class I and Angle Class II cases. 3. A tooth-size discrepancy analysis should be included as one part of the diagnostic records for mandibular prognathism.

Adolescent↗
PubMed1977

Monozygosity in twins: a detailed investigation.

The twins presented in this article showed similarities in their physical make-up to a very high degree. Statistically, however, it is the blood picture which holds the "trump card" in this plethora of evidence supporting monozygous twinning, and it is an essential prerequisite in any presentation of this nature. It is perhaps noteworthy that, while only one of the twins sucked his thumb habitually, there was no difference in the degree of postnormality of the posterior teeth but merely a change in the interincisor relation and in the palatal height. It can clearly be seen from the study of these two twins that the differences between them were very small indeed and could quite easily be classed as individual variations within the same identical genetic pattern. Similarly, in any other identical twins, the way in which one differs from another must be to a similarly small degree or the cause of the difference must clearly be attributable to environmental or acquired influences. Differences which cannot be classed as other than genetic show us that the twins are fraternal or dizygous and, therefore, no more alike than would be two brothers of differing ages.

Blood Chemical Analysis↗
PubMed1977

Accurate arch-discrepancy measurements.

A new technique for accurately measuring tooth-to-arch-length discrepancies according to the ideal arch form is discussed. The armamentarium for making these measurements is explained, and the technique is demonstrated. Clearly, this is an important part of orthodontic diagnosis, and there is a need for greater accuracy than that which techniques of the past have made possible.

Dental Arch↗
PubMed1978

The use of regression constants in estimating tooth size in a Negro population.

A study of a sample of 105 Negro children and adolescents, residents of Connecticut, was undertaken to determine the degree of correlation between mandibular tooth size and the size of the canines and premolars. The correlation between the total mesiodistal width of the mandibular permanent incisors and that of the maxillary or mandibular canine and first and second premolars was found to be 0.63 and 0.71, respectively. Further, regression constants were determined in an attempt to estimate the buccal segments from the mandibular incisors.

Adolescent↗
PubMed1978

Prediction of the mesiodistal widths of maxillary permanent canines and premolars.

Multiple regression equations for prediction of the mesiodistal widths of the maxillary canines and premolars were developed for the right and left sides of the arches of males and females. The equations were developed from longitudinal data taken from ninety-two Caucasian children (forty-six boys and forty-six girls) who participated in the Iowa Growth Study. The multiple regression equations, when compared with three currently used methods of prediction, were the best predictors. The newly developed equations and other prediction methods currently in use were tested on longitudinal data taken from a sample of forty-three Caucasian orthodontic patients (sixteen males and twenty-seven females). Again, the multiple regression equations had the best performance.

Adolescent↗
PubMed1979

Prediction of lower canine and premolar widths in the mixed dentition.

The purpose of this investigation was to determine whether, with multiple regression analysis, a more accurate method than is now available for predicting the widths of unerupted mandibular canines and premolars of mixed-dentition patients could be developed. Regression analyses were performed on data derived from 83 Caucasian subjects (42 males and 41 females) who participated in the Iowa Growth Study. Measurements were taken on plaster casts of the mandibular incisors, canines, premolars, and first molars. Measurements of the mandibular canines, premolars, and first molars were obtained from periapical radiographs taken with a long-cone technique. Newly developed regression equations for each sex had the highest correlation coefficients and smallest absolute errors of estimate when compared to previously published methods. The new equations and previous prediction methods were tested on a sample of 55 orthodontic patients (23 males and 32 females). The newly developed equations were also the most accurate method of prediction in the orthodontic patient sample.

Adolescent↗
PubMed1979

A comparison of four methods of predicting arch length.

1. Four arch length prediction equations (Nance, Johnston-Tanaka, Moyers, and Hixon-Oldfather) were compared by examining pretreatment casts, pretreatment intraoral radiographs, and posttreatment casts of forty-one patients of mixed-dentition age. 2. A comparison of correlation coefficients and slopes of the predicted arch length versus the actual arch lengths revealed that the Hixon-Oldfather method conformed closest to the ideal. 3. No combination of the four methods produced a more accurate equation than the single most accurate method. 4. Neither the sex of the patient nor the type of occlusion affected the prediction accuracy of any of the four equations. 5. All methods tend to overpredict the arch length size by 1 to 3 mm., with the exception of the Hixon-Oldfather equation, which underpredicted by approximately 0.5 mm. 6. An analysis of the intrainvestigator error showed a very low standard error of estimate for individual tooth measurements and for the prediction values. 7. A variance analysis showed that most of the variation was due to arch length (85%), a slight amount was due to the prediction method (8%), and 6% of the variation was due to the rater. 8. A low correlation was found between space available versus actual discrepancy and space available versus actual arch length. 9. High correlation coefficients were found for the predicted arch lengths when compared with the actual arch lengths. As expected, the correlation coefficients for the predicted widths of only the canines and premolars compared with the actual widths were not quite as high.

Bicuspid↗
PubMed1979

Preformed arch wires: reliability of fit.

The preformed arch wires currently available are unsuitable for many orthodontic cases, since these arch wires do not take into account all the variations in the size and dimensions of the human arch. In this study, nine theoretical arch wires are derived, based upon two-parameter curves. Tests were conducted which demonstrated that arch wires performed to these nine sets of dimensions would correspond with a reasonable degree of accuracy to a large section of the orthodontic population.

Cephalometry↗
PubMed1979

Mesiodistal crown diameters of permanent teeth in male American Negroes.

The mesiodistal crown diameters were measured in a group of fifty-six male American Negroes from the recruit population at the Great Lakes Naval Training Center and compared with previously reported data on Caucasians from the same population. The results indicate that tooth size is consistently larger in the Negro sample, averaging about 8.4 percent for the over-all maxillary and mandibular dentition, excluding third molars.

Bicuspid↗
PubMed1980

Autogenic tooth transplantation. The "state of the art".

With proper case selection and technique, autogenic tooth transplantation can be a viable treatment modality. The authors present a number of transplant cases and suggest the procedure be considered as an adjunct in orthodontic treatment planning. A comprehensive review of the literature, combined with the authors' opinions and clinical demonstrations, has culminated in a discussion of indications and contraindications, special considerations, optimal timing, technique, and prognosis. It is thought that appropriate utilization can simplify or eliminate prosthetic requirements, reduce the complexity of many orthodontic treatment plans, and convert into routine certain cases heretofore thought to be inoperable.

Alveolectomy↗