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Fracture resistance of weakened bovine teeth after long‐term use of calcium hydroxide
Author(s) -
Valera Marcia Carneiro,
Albuquerque Maria Tereza Pedrosa,
Yamasaki Mayra Cristina,
Vassallo Flávia Nicolle Stefani,
Silva Denise Almeida e Silva Alves,
Nagata Juliana Yuri
Publication year - 2015
Publication title -
dental traumatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.82
H-Index - 81
eISSN - 1600-9657
pISSN - 1600-4469
DOI - 10.1111/edt.12185
Subject(s) - apexification , calcium hydroxide , dentistry , sodium hypochlorite , chlorhexidine , fracture (geology) , medicine , calcium , chemistry , permanent teeth , materials science , composite material , organic chemistry
Abstract Background/Aim In some parts of the world, revascularization may not be the most feasible treatment option for necrotic immature teeth. Therefore, apexification remains the most widely utilized treatment option for these cases. This study aimed to evaluate the fracture resistance of weakened bovine tooth roots treated with various irrigant solutions as well as long‐term application of calcium hydroxide intracanal medication ( ICM ). Material and methods One hundred seventy bovine teeth were randomly divided into three experimental groups ( n = 50) and two control groups ( n = 10). Group SS was irrigated with physiologic solution; group CHX was treated with 2% chlorhexidine gel and group Na OC l was irrigated with 1% sodium hypochlorite. After instrumentation, root canals were dressed with calcium hydroxide and evaluated at different periods (15, 60, 90, 180, and 360 days). The specimens were loaded at a 45° angle to measure fracture resistance through the use of an EMIC test machine. Results A decrease in fracture resistance was observed during the time of ICM dressing. The highest values of fracture resistance were observed in group SS with 15 days of ICM , not differing from the control group. Irrigation with Na OC l associated with ICM for 15 days presented the lowest fracture resistance; however, a statistically significant difference was not observed when compared with SS and CHX in the same time period. In longer periods of exposure to ICM (180 and 360 days), root canals irrigated with Na OC l and CHX showed significantly lower fracture resistance than SS ( P < 0.05). Conclusion Apexification with periodic changes of calcium hydroxide medicament leads to weakness of the teeth independent of the irrigation solution used.