www.sbdmj.com - Stomatologija - Baltic Dental and Maxillofacial Journal

Summary

Root canal retreatment in teeth restored with intraradicular posts has attracted interest due to the difficulties of their removal without weaking, perforating or fracturing the remaining root structure. The use of ultrasonic devices has been suggested by some authors to facilitate post removal, reducing the possibility of fractures or root perforations. The purpose of this study was to determine the efficacy of cast posts removal by ultrasonic device regarding post length, adaptation of post to root canal walls and cement type. Material and methods: Seventy-seven single rooted endodontically treated teeth restored with cast posts were included to this study. Post removal was processed with ultrasonic and time for this was recorded. The length and width of the post, quality of post adaptation, type of cement were evaluated according to radiographic findings and clinical records. Results: Mean value of time needed for post removal was 14.15 (SD ± 8.57) minutes. A strong correlation was observed between the time of post removal and post length (r=0.620, p=0.000).The mean time required for the removal of posts cemented with zinc phosphate was 11.36 min (SD ± 5.84) and for the posts cemented with resin modified glass-ionomer was 15.37 min (SD ± 3.83). Statistically significant difference in the time needed for the posts cemented with different cements was observed (p = 0.002). The mean time needed for the post removal with the inappropriate adaptation was 10.1 min (SD ± 6.0) and the time for the post with appropriate adaptation was 15.7 min (SD ± 8.9). Statistically significant difference between these two groups was observed for the time of posts removal (p = 0.003).

According to the results of linear regression model test, 50% of variation in time needed to remove posts was explained by following variables: post length, post adaptation and the cement type. The total regression model was highly significant (p = 0.000).

Conclusions: The time taken for post removal depended on post length, its adaptation in the root canal and on the type of luting cement. Root fractures are unlikely to occur with good case selection.

Key words: root canal retreatment, post, ultrasonic device, cement type

Received: 15 11 2004

Accepted for publishing: 22 03 2005

¹Institute of Odontology, Faculty of Medicine, Vilnius University, Lithuania.

Vytautė Peciulienė¹ - D.D.S., PhD, assoc. prof.
Juratė Rimkuvienė¹- D.D.S., assist. prof.
Rasmutė Manelienė¹ - D.D.S., PhD, assoc. prof.
Rolandas Pletkus¹ - D.D.S., lecturer.

Address correspondence to Dr. Vytaute Peciuliene, Institute of Odontology, Zalgirio 115, Vilnius, Lithuania.



	Baltic Dental and Maxillofacial Journal

March, 2005, Vol. 7, No. 1 CONTENTS SCIENTIFIC ARTICLES Halitosis Manifestation and Prevention Means for Patients with Fixed Teeth Dentures 3 - 6 Clinical Effectiveness of the Twin Block Appliance in the Treatment of Class II Division 1 Malocclusion 7 - 10 Dental Treatment Needs in Lithuanian Adolescents 11 - 15 Mandibular Pubertal Growth Spurt Prediction. Part One: Method Based on the Hand-Wrist Radiographs 16 - 20 Factors Influencing the Removal of Posts 21 - 23 Oral Hygiene in Children with Type I Diabetes Mellitus 24 - 27 Critical Assessment of Temporomandibular Joint Clicking in Diagnosing Anterior Disc Displacement 28 - 30 © 2005 Stomatologija		Stomatologija 2005; 7 (1): 21-23 164 KB Factors Influencing the Removal of Posts Vytautė Pečiulienė, Juratė Rimkuvienė, Rasmutė Manelienė, Rolandas Pletkus Summary Root canal retreatment in teeth restored with intraradicular posts has attracted interest due to the difficulties of their removal without weaking, perforating or fracturing the remaining root structure. The use of ultrasonic devices has been suggested by some authors to facilitate post removal, reducing the possibility of fractures or root perforations. The purpose of this study was to determine the efficacy of cast posts removal by ultrasonic device regarding post length, adaptation of post to root canal walls and cement type. Material and methods: Seventy-seven single rooted endodontically treated teeth restored with cast posts were included to this study. Post removal was processed with ultrasonic and time for this was recorded. The length and width of the post, quality of post adaptation, type of cement were evaluated according to radiographic findings and clinical records. Results: Mean value of time needed for post removal was 14.15 (SD ± 8.57) minutes. A strong correlation was observed between the time of post removal and post length (r=0.620, p=0.000).The mean time required for the removal of posts cemented with zinc phosphate was 11.36 min (SD ± 5.84) and for the posts cemented with resin modified glass-ionomer was 15.37 min (SD ± 3.83). Statistically significant difference in the time needed for the posts cemented with different cements was observed (p = 0.002). The mean time needed for the post removal with the inappropriate adaptation was 10.1 min (SD ± 6.0) and the time for the post with appropriate adaptation was 15.7 min (SD ± 8.9). Statistically significant difference between these two groups was observed for the time of posts removal (p = 0.003). According to the results of linear regression model test, 50% of variation in time needed to remove posts was explained by following variables: post length, post adaptation and the cement type. The total regression model was highly significant (p = 0.000). Conclusions: The time taken for post removal depended on post length, its adaptation in the root canal and on the type of luting cement. Root fractures are unlikely to occur with good case selection. Key words: root canal retreatment, post, ultrasonic device, cement type Received: 15 11 2004 Accepted for publishing: 22 03 2005 ¹Institute of Odontology, Faculty of Medicine, Vilnius University, Lithuania. Vytautė Peciulienė¹ - D.D.S., PhD, assoc. prof. Juratė Rimkuvienė¹- D.D.S., assist. prof. Rasmutė Manelienė¹ - D.D.S., PhD, assoc. prof. Rolandas Pletkus¹ - D.D.S., lecturer. Address correspondence to Dr. Vytaute Peciuliene, Institute of Odontology, Zalgirio 115, Vilnius, Lithuania.