Effect of Varying the Depth of Heat Application on the Adaptability of Gutta-Percha During Warm Vertical Compaction

By Smith RS, Weller N, Loushine RJ and Kimbrough WF

Date: 07/2000
Journal: JOE

Summary: 

•Purpose:  to compare adaptability of GP while varying the depth of heat application to obturate a standard root canal.

•N= extracted human maxillary central incisor

•Materials/Methods:

•An extracted human maxillary central incisor was completely embedded in a block of clear orthodontic acrylic resin.

•split-tooth model was used. Crowns were removed. Step-back preparation to #60 FlexOFile at the established WL.

•Three shallow depressions in the apical 1/3, <0.5 mm deep, were placed on the distal side of the canal at 1, 3, and 5 mm from the WL

•Six groups of 20 obturations were performed for each technique evaluated. Root canal sealer was not used

thermoplasticized injectable (T1) Obtura II,

lateral condensation

warm vertical compaction (with heat applications at 3, 4, 5, and 7 mm from the WL).

•The mesial and distal sides of each obturation were examined with an operating microscope at X32 magnification.

•The quality of the obturation was graded based on the replication to the WL, replication of the artificial depressions, surface adaptation, and homogenicity of the gutta-percha.

Most highlighted Results: 

1.All techniques were significantly different from each other except between the TI group and the WVC-3 mm group which were similar.

2.Obturations were ranked with the TI technique best followed by WVC-3 mm, WVC-4 mm, WVC-5 mm, and WVC-7 mm. The LC technique ranked last.

split-tooth model was used. Crowns were removed. Step-back preparation to #60 FlexOFile at the established WL.

•Three shallow depressions in the apical 1/3, <0.5 mm deep, were placed on the distal side of the canal at 1, 3, and 5 mm from the WL

•Six groups of 20 obturations were performed for each technique evaluated. Root canal sealer was not used

thermoplasticized injectable (T1) Obtura II,

lateral condensation

warm vertical compaction (with heat applications at 3, 4, 5, and 7 mm from the WL).

•The mesial and distal sides of each obturation were examined with an operating microscope at X32 magnification.

•The quality of the obturation was graded based on the replication to the WL, replication of the artificial depressions, surface adaptation, and homogenicity of the gutta-percha.

Most highlighted Results: 

1.All techniques were significantly different from each other except between the TI group and the WVC-3 mm group which were similar. 2.Obturations were ranked with the TI technique best followed by WVC-3 mm, WVC-4 mm, WVC-5 mm, and WVC-7 mm. The LC technique ranked last.

Clinical significance:

Deeper heat penetration during WVC of GP improved the three-dimensional obturation of the root canal space.