Evaluation of two techniques to measure the available space in the mandibular dental arch using the method error

Letícia Alves Machado, Oswaldo de Vasconcellos Vilella, Leticia Machado


Purpose: To evaluate the influence of errors when two methods for assessing the available space in the dental arch are used.
Methods: A single investigator measured the available space in 30 plaster models by using two techniques: 1) with a digital caliper; and 2) by contouring the arch with a brass wire and subsequently straightening and measuring this wire with a millimeter ruler. Fifteen days later, data were collected using both methods with duplicate measurements, so that each method was used twice for each model. The random and systematic errors of each method under the conditions of repeatability and reproducibility were calculated.
Results: For method reproducibility, systematic errors were statistically significant (P <0.05) only when the brass wire method was used. The random errors were less than 1 mm under both conditions. With the brass wire, random errors were not significant for repeatability; however, for reproducibility, the mean value was 1.69 mm.
Conclusion: In the digital caliper method, systematic and random errors were considered acceptable. The brass wire measurement method did not present errors under the condition of repeatability; for reproducibility, however, the systematic error was significant and the random error indicates that this method should be considered inappropriate to measure space in the dental arch.


Dental arch; space measurement; reproducibility

Full Text:


e-ISSN: 1980-6523

ISSN-L: 0102-9460


This journal is a member of, and subscribes to the principles of, the Committee on Publication Ethics (COPE) http://www.publicationethics.org

SJR (SCImago Journal & Country Rank) IMPACT FACTOR:

SCImago Journal & Country Rank

Licença Creative Commons

Except where otherwise noted, content of this journal is licensed under a Creative Commons Attribution 4.0 International license.


Editorial Policies of Brazilian Scientific Journals. Deposit availability: Blue .


Copyright: © 2006-2019 EDIPUCRS