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A temporary filling material used for coronal sealing during endodontic treatment may cause tooth fractures in large Class II cavities in vitro
Author(s) -
Tennert C.,
Eismann M.,
Goetz F.,
Woelber J. P.,
Hellwig E.,
Polydorou O.
Publication year - 2015
Publication title -
international endodontic journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.988
H-Index - 119
eISSN - 1365-2591
pISSN - 0143-2885
DOI - 10.1111/iej.12280
Subject(s) - coronal plane , dentistry , materials science , orthodontics , medicine , anatomy
Aim To investigate the use of a zinc oxide/zinc sulphate‐based cement ( C oltosol ® F , C oltène W haledent, C uyahoga F alls, OH , USA ) as a temporary filling material during multiple‐visit root canal treatments and the occurrence of cracks within the filling material or the tooth. Methodology Root canals of one hundred and twenty‐two extracted human molars were prepared using P ro T aper instruments up to size F 2. After root canal preparation, standardized mesial‐occlusal‐distal cavities were prepared. The buccal‐lingual/palatal width of the cavities was 4.5 mm), so that the remaining cavity walls had a mean thickness of 3.5 mm. Teeth were checked for cracks and fracture lines using a stereomicroscope with 10× magnification. A calcium hydroxide slurry was used as an intracanal dressing. The teeth were divided into three groups. In the C oltosol group, the cavity was filled with C oltosol ® F . In the C oltosol‐ C learfil group, a 2‐mm layer of C oltosol ® F was placed into the coronal pulp chamber, the remaining cavity was filled with C learfil ™ . In the C learfil group, a foam pellet was placed onto the orifices of the root canals, the remaining cavity was filled with C learfil ™ . In the control group, the cavities were left without any filling material. The teeth were stored in water at 37 °C for 14 days and examined every 24 h under a stereomicroscope for fracture lines occurring on the tooth surface or in the filling material. Results In the C oltosol group, fractures within the filling material were observed in 28 (85%) of 33 teeth. 13 (39%) teeth had tooth fractures. Amongst these teeth, 8 (61%) had root fractures, 1 (8%) had a crown fracture and 4 (31%) had a root‐crown fracture. Conclusion Coltosol ® F , when used alone as a restorative material, led to tooth fractures in Class II cavities in teeth undergoing root canal treatment. Tooth fractures may occur 4 days after placement of the filling.