Analysis of Continuous-Wave Obturation Using a Single-cone and Hybrid Technique

By : Guess G, Edwards K, Yang M, Igbal M, Kim S.

Date: 01/2004
Journal: JOE


Purpose:  to compare hybrid technique (lateral and continuous wave) to continuous wave technique for adaptation of obturation material.

N= 56 MB root for mandibular molar.


•Curvatures of the teeth was assessed then sample was stratified and assigned randomly to 2 groups.

•Canals was instrumented to size 6 series 29 profile/0.06, 0.5 from the end of the root with water irrigation only.

G1: fine/medium cone cut to tip size 40 was placed, system B plugger inserted to binding point, after 10 sec. a burst of 2 sec heat the  plugger was removed.

G2: cone ISO 40, spreader was inserted to 1-2 mm from WL, 3 FF accessory cones inserted then cut-back done same as G1.

•For both groups ZOE sealer was used, depth of the plugger penetration from WL was measured.

•Teeth were sectioned at 1 mm and 3 mm, photographed, evaluated by 4 blinded investigators

Score 1: gutta-percha adaptation (contact) to all of the prepared root surface with minimal sealer. 2: gutta-percha adapting to 2⁄3 of the prepared root surface. 3: adaptation of gutta-percha to less than 1⁄3 of the prepared root surface

Most highlighted Results:

•No statistically significant difference between 2 techniques.

•For continuous wave group ,No statistically significant difference  was found when depth of the plugger. •

Best results (adaptation) noticed when plugger was inserted to 3.5-4.5 mm from WL

Clinical significance:  

Both lateral and continuous wave condensation were equally good