•Purpose: to measure different anatomical landmarks relating to pulp chamber morphology in anterior teeth and to test the hypotheses that the distance from the midpoint of the lingual fossa to the pulp chamber would be similar for different anterior tooth types.
•N= 600 recently extracted anterior teeth (100 for each tooth type)
•Inclusion criteria: upper and lower central and lateral incisors and canines. Exclusion criteria: crowned teeth or teeth with caries and restorations violating the pulp chamber.
•100 extracted teeth of each anterior tooth type were obtained (total: 600). • Digital radiograph were obtained for each tooth and four direct measurements were taken.( A, B, C, D) (Fig. 1).
•One way ANOVA and Students’ Newman Keul’s tests were used to compare the mean measurements of different tooth types
Most highlighted Results:
• The distance between the lingual surface and the pulp chamber varied significantly between tooth types (P- value <0.001) and ranged from 4.4-5.9 mm. the mean distance for all the teeth was 5.2 mm.
providing an estimate of the access cavity depth (C), and an estimate of the safety margin from proper access to perforation (D)
strengths: large sample size and use of multiple comprehensive measurements.
weakness: age of the patients were not known, exclusion criteria were not clearly specified (e.g. if teeth with attrition or teeth with root caries affecting CEJ were excluded). Susceptibility to radiographic errors.
- A represents the distance from the cusp tip to the lingual CEJ.
- B represents the distance from the buccal to the lingual CEJ.
- C represents the distance between the midpoint of the cusp tip to the lingual CEJ and the midpoint of the buccal to the lingual CEJ.
- D is the distance from the midpoint of B to the labial surface of the tooth.
- E is the sum of distances C and D.