Maxillary Anterior Caries Associated with Increased Caries Risk in Other Primary Teeth

It has been suggested that children with caries of maxillary anterior primary teeth may have increased caries incidence in other teeth. This study aimed to quantify the extent of posterior dental caries in those children who initially presented with maxillary anterior caries compared with that of those who did not. Data were collected for 217 Head Start children participating in a one-year study to determine caries risk factors. Tooth surfaces were recorded as carious, restored, or extracted (missing due to caries). Caries was then categorized into the following pattern(s): maxillary anterior (MA), pit/fissure (PF), posterior proximal (PP), and posterior buccal/lingual smooth surface (BL). Compared with children who did not initially present with the maxillary anterior pattern, those with the maxillary anterior pattern had 2.5 times (p < 0.01) the mean number of posterior decayed, missing, and filled surfaces (dmfs) and approximately 3 times the prevalence (p < 0.01) of the PP and BL patterns. The positive predictive value of the MA pattern was 86.8% for children who developed the PF pattern, and the negative predictive values were greater than 91% for children who did not develop the PP and BL patterns. The prevalence of maxillary anterior caries among children in this study is associated with a significantly greater caries incidence in posterior teeth.

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Thermal Changes in Root Surface of Primary Teeth During Root Canal Treatment With Diode Lasers: An In Vitro Study

Journal of lasers in medical sciences ◽

10.15171/jlms.2018.43 ◽

2018 ◽

Vol 9 (4) ◽

pp. 237-242 ◽

Cited By ~ 2

Author(s):

Bahman Seraj ◽

Zahra Moosavi Garmaroodi ◽

Nasim Chiniforush ◽

Sara Ghadimi

Keyword(s):

Temperature Rise ◽

Primary Teeth ◽

External Surface ◽

Diode Lasers ◽

Root Surface ◽

Root Space ◽

Posterior Teeth ◽

Mean Temperature ◽

The Mean ◽

Group B

Introduction: Increased temperature due to the application of laser during root canal disinfection may damage periodontium, alveolar bone, and permanent dental germ. The aim of this study was to evaluate the temperature increase of the external surface of primary roots due to the application of 810 nm and 980 nm diode lasers. Methods: A total of 58 extracted human primary teeth were prepared and randomly divided into two groups: (a) 810 nm diode laser and (b) 980 nm diode laser. Then, each group was divided into 4 subgroups based on the location of the temperature measurement, including subgroup 1: external root surface of primary anterior roots (A); subgroup 2: external root surface of posterior teeth at inter-root space (IS); subgroup 3: external root surface of posterior teeth at outer-root space (OS) and subgroup 4: external surface of furcation area of posterior teeth (F). Results: The mean temperature rise in group a (7.02±2.95ºC) was less than that of group b (10.62±4.59ºC) (P<0.001). Also, a significant difference was found between the laser groups in terms of the mean temperature rise of the external root surface at IS, OS and F, with higher temperature increase occurring in all points in laser b. The comparison of irradiation points in each laser showed a higher mean temperature rise for IS than OS, but this difference was only significant in group b (P<0.001). Conclusion: Within the studied parameters, 810 nm and 980 nm diode lasers should be used cautiously in primary root canals because of their temperature rise during their application.

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Accuracy of different tooth surfaces on 3D printed dental models: orthodontic perspective

BMC Oral Health ◽

10.1186/s12903-020-01338-6 ◽

2020 ◽

Vol 20 (1) ◽

Author(s):

Ting Dong ◽

Xiaoting Wang ◽

Lunguo Xia ◽

Lingjun Yuan ◽

Niansong Ye ◽

...

Keyword(s):

Posterior Teeth ◽

Stl File ◽

Tukey Test ◽

Occlusal Surfaces ◽

Tooth Surfaces ◽

Dental Models ◽

3D Printed ◽

The Mean ◽

Lower Limits ◽

Pits And Fissures

Abstract Background Few studies have been reported regarding the accuracy of 3D-printed models for orthodontic applications. The aim of this study was to assess the accuracy of 3D-printed dental models of different tooth surfaces. Methods Thirty volunteers were recruited from the hospital, and then their dental models were produced by means of oral scanning and a stereolithography-based 3D printer. Each printed model was digitally scanned and compared with the oral-scanned STL file via superimposition analysis. A color map was used to assess the accuracy of different surfaces (occlusal, buccal, lingual) of anterior and posterior teeth. The Tukey test was used to evaluate the differences between the superimposition. Results Statistically significant differences were found in the average deviations of different tooth surfaces (P < 0.05). The mean average absolute deviations of the occlusal surfaces of posterior teeth were greater than those of other surfaces. Percentages of points beyond the upper and lower limits of different tooth surfaces displayed the same results (P < 0.05). Conclusions Occlusal surfaces, especially pits and fissures of posterior teeth on 3D printed maxillary dental models, showed greater distortions than those of other teeth and regions.

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Accuracy of 3D-Printed Dental Models of Different Tooth Surfaces

10.21203/rs.3.rs-30276/v1 ◽

2020 ◽

Author(s):

Ting Dong ◽

Xiaoting Wang ◽

Lunguo Xia ◽

Niansong Ye ◽

Lingjun Yuan ◽

...

Keyword(s):

3D Printer ◽

Posterior Teeth ◽

Stl File ◽

Occlusal Surfaces ◽

Tooth Surfaces ◽

Dental Models ◽

3D Printed ◽

The Mean ◽

Lower Limits ◽

Pits And Fissures

Abstract Background: Few studies have been reported regarding the accuracy of 3D-printed models for orthodontic applications. The aim of this study was to assess the accuracy of 3D-printed dental models of different tooth surfaces.Methods：Thirty maxillary dental models were produced by means of a stereolithography-based 3D printer. Each printed model was digitally scanned and compared with the oral-scanned STL file via superimposition analysis, with a colour map used to assess the accuracy of different surfaces of anterior and posterior teeth.Results: Statistically significant differences were found in the average deviations of different tooth surfaces. The mean average absolute deviations of the occlusal surfaces of posterior teeth were greater than those of other surfaces. Percentages of points beyond the upper and lower limits of different tooth surfaces displayed the same results.Conclusions: The occlusal surfaces of posterior teeth on 3D-printed dental models show greater deviations than those of other regions, especially in pits and fissures.

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Toward an Early Start for Head Start Children: Evidence from a Literacy Enrichment Starting at Age Three

International Journal of Learning Teaching and Educational Research ◽

10.26803/ijlter.20.11.14 ◽

2021 ◽

Vol 20 (11) ◽

pp. 255-271

Author(s):

Haiyan Zhang

Keyword(s):

Head Start ◽

Literacy Skills ◽

Head Start Program ◽

Group 4 ◽

Head Start Children ◽

Comprehensive Literacy ◽

Literacy Performance ◽

One Year ◽

Educational Variables ◽

Literacy Enrichment

The purpose of this study is to evaluate the utility of providing comprehensive literacy instruction to preschool children starting at age three. The literacy development in two groups of four-year-old children (N = 1320) was compared during their enrollment in a literacy-enriched Head Start program. The first group entered the program at age four and participated in the program for only one year (Group 4-1); the second group had previously participated in the program at age three and at the time of the study were in their second year of the program (Group 4-2). Multilevel growth modelling procedures were used to compare literacy performance levels and growth rates between the two groups after controlling for relevant child, family, and educational variables. Results showed that Group 4-2 exhibited significantly higher literacy skills than Group 4-1 at both the beginning and end of the program year, although Group 4-2 had a slower growth rate than Group 4-1 over the program year. The theoretical and practical implications of the study were discussed.

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Factorial Composition of the Short Form of the Stanford-Binet with Culturally Disadvantaged Head Start Children

Psychological Reports ◽

10.2466/pr0.1973.32.3c.1048 ◽

1973 ◽

Vol 32 (3_suppl) ◽

pp. 1048-1050

Author(s):

Daniel P. Hallahan ◽

Donald W. Ball ◽

James S. Payne

Keyword(s):

Head Start ◽

Short Form ◽

Verbal Ability ◽

Age Group ◽

Visual Ability ◽

Head Start Children ◽

Specific Factors ◽

The Mean ◽

Culturally Disadvantaged ◽

Factorial Composition

This study reports a factor analysis of the 1960 revision of the Stanford-Binet (Short Form). The Binet was administered to 363 children ranging in age from 3.0 to 5.8 yr. with a mean of 4.3 yr. All Ss were classified as culturally disadvantaged. The mean IQ for this group was 91.6. Three factors were found—a general one and two specific factors of visual ability and judgment and verbal ability. The study was compared with Ramsey and Vane's study which applied a similar analysis to a similar age group of middle-class Ss using Stanford-Binet.

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