Root-crown ratios of permanent teeth in Malay patients attending HUSM Dental Clinic
- Author:
Norisa Othman
;
Haslina Taib *
;
Norehan Mokhtar
- Publication Type:Journal Article
- Keywords:
Crown height, Permanent teeth, Root length, Root-crown ratio.
- From:Archives of Orofacial Sciences
2011;6(1):21-26
- CountryMalaysia
- Language:English
-
Abstract:
The objectives of this study were to determine the
normal mean value of the root-crown (R/C ratios) in Malay
patients and their variations by gender and dental arch from
orthopantomogram radiographs (OPGs). Two thousand nine
hundred and twenty teeth with fully developed roots were
measured from 112 OPGs. Subjects with history of maxillofacial
trauma or orthodontic therapy were excluded. The mean age of
the subjects was 19.1 (SD 2.08) years old for males while
females 18.9 (SD 2.19) years old in the range from 15 to 22
years old. The intra-examiner reproducibility of the assessment
method was good (Intraclass correlation coefficient 0.81).
Results of this study showed that there was no significant
difference between R/C ratios of males and females groups.
However, the ratios of the antagonist teeth for both males and
females were significantly greater in the mandible than in the
maxilla (p<0.05 for right and left lateral incisors and right first
premolars in male; p<0.001 for all other teeth). In both gender,
the highest R/C ratio was mandibular second premolars and
the lowest R/C ratio were maxillary central incisors. The rootcrown
ratio could be used as a baseline data and reference to
help in orthodontic diagnosis, treatment planning and prognosis
as well as evaluation developmental root deficiency.
- Full text:W020150629335607262561.pdf
