Root dentinal microcracks: a post‐extraction experimental phenomenon?

De‐Deus, Gustavo; Cavalcante, Daniele Moreira; Belladonna, Felipe Gonçalves; Carvalhal, Júlio César de Azevedo; Souza, Erick Miranda; Lopes, Ricardo Tadeu; Versiani, Marco Aurélio; Silva, Emmanuel João Nogueira Leal; Dummer, P. M. H.

doi:10.1111/iej.13208

Cited by 23 publications

(50 citation statements)

References 22 publications

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“…Literature suggests some of the in vitro conditions in which several studies were performed as a possible reason for the formation of microcracks: stresses exerted during extraction (either traumatic or atraumatic extraction techniques) [ 56 , 57 ], possible tooth dehydration, inappropriate storage and careless handling of the extracted teeth, as well as absence of periodontal support [ 27 , 29 ]. Therefore, in the present ex vivo study we could have obtained an overestimation of microcracks, despite all the efforts that have been made to prevent it—only freshly extracted teeth were included and specimens were kept moist throughout the experimental procedures, along with the use of silicon blocks to minimize the concern of the absence of periodontal ligament and stabilize the teeth during instrumentation procedures, although in Gondim et al [ 58 ], the use of stabilization methods did not prevent the appearance of fractures after root-end preparation.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of Root-End Preparation with Two Different Endodontic Microsurgery Ultrasonic Tips

et al. 2020

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The aim of this study is to compare root-end preparation performed with two different ultrasonic tips—CVDentus and NSK—and respective time requirements. After root-end resection, 32 teeth were randomly divided in two groups, according to the ultrasonic tip used for root-end preparation. Preparation time was recorded. Photomicrographs were taken to assess the following parameters: root surface microcracking, marginal integrity and presence of debris. One ultrasonic tip from each group was analyzed through scanning electron microscopy before and after root-end preparation. The significance level was set at α = 0.05. Incidence of microcracks in both groups was 12.5%. Solely intracanal microcracking was found, consistently positioned within the widest side of the remaining dentine. No statistically significant differences were verified between both experimental groups regarding marginal integrity (p = 0.102) and preparation time (p = 0.780), whereas statistical differences (p = 0.003) were found concerning the presence of debris (the minimum registered score was mostly verified in CVDentus group). NSK tips showed major morphological changes, with extensive surface wear and noticeable loss of particles, which was not verified on CVDentus tips. Our findings suggest significant differences regarding root-end preparation walls quality, with CVDentus tips showing better results. Concerning microcracking, as well as preparation time and marginal integrity, both ultrasonic tips showed similar results. Qualitative analysis exposed NSK tips major morphological changes and wear after use, which was not verified on CVDentus tips.

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Section: Discussionmentioning

confidence: 99%

Evaluation of Root-End Preparation with Two Different Endodontic Microsurgery Ultrasonic Tips

et al. 2020

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“…The microcracks observed post‐extraction were not present pre‐extraction. They therefore concluded that microcracks observed are due to the extraction process and the storage condition . This might explain why other studies have shown that dehydrated dentin has a lower fracture resistance than hydrated dentin …”

Section: Discussionmentioning

confidence: 94%

“…It was shown that the restorative status and tooth age are important variables . It was also suggested that microcracks seen in teeth from tooth banks may be due to the extraction process and the storage conditions . Dentin dehydration is another factor known to decrease fracture resistance .…”

Section: Introductionmentioning

confidence: 99%

Resistance to fracture of extracted teeth used for pre‐clinical endodontic procedures: Influence of storage conditions

Mello

Michaud

Tanner

2020

Eur J Dental Education

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Objectives The purpose of this in vitro study was to determine whether different storage conditions used during endodontic procedures affect the fracture resistance of extracted teeth used for pre‐clinical dental education. Methods Freshly extracted mandibular incisors and canines were sterilised in an autoclave for 40 minutes at 24°F under a pressure of 20 psi and then stored in distilled water at 4°C until use. Specimens were randomly assigned to two groups based on the storage method used whilst undergoing endodontic procedures. Between endodontic sessions, teeth in the Wet Group (n = 16 incisors; n = 4 canines) were stored in distilled water and teeth in the Dry Group (n = 16 incisors; n = 4 canines) were stored in a dry container. All specimens were kept at room temperature and away from sunlight. Endodontic treatments were performed in 3 sessions over a 3‐week period. The specimens were then brought to fracture under compressive forces along the long axis of the tooth in an Instron universal testing machine. The data were analysed using t tests (α = 0.05). Results None of the teeth fractured during endodontic procedures. However, the compressive load required to fracture teeth stored under wet conditions was significantly higher than the load needed for teeth stored dry (P < .05). Conclusions Fracture resistance is affected by storage conditions; teeth stored in water have a higher resistance to fracture than teeth that are stored dry. Fracture resistance was, however, not reduced enough to lead to tooth fracture during pre‐clinical endodontic procedures.

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“…Nevertheless, in preparation of mandibular teeth cadavers, De Deus et al 33 observed pre-existing microcracks. More recently, another study by De Deus et al 34 also aimed to investigate the occurrence of preexisting dentinal defects in non-endodontically treated teeth in fresh cadavers. It was suggested that pre-existing dental defects are treated are experimental and formed by storage conditions and/or due to extraction procedures.…”

Section: Discussionmentioning

confidence: 99%

Micro-CT analysis of dentinal microcracks on root canals filled with a bioceramic sealer and retreated with reciprocating instruments

Almeida

Romeiro

Cassimiro

et al. 2020

Sci Rep

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This study aimed to analyze the potential occurrence of dentinal defects after the removal of a root canal filling with two different sealers using Reciproc (RC) or Reciproc Blue (RB). The mesial roots of 60 mandibular molars with a Vertucci type IV configuration were selected. The samples were initially instrumented with Reciproc (R25) and then divided into the following four experimental groups according to the endodontic sealer and retreatment instrument (n = 15): BC Sealer/Reciproc (BCRC); BC Sealer/Reciproc Blue (BCRB); AH Plus/Reciproc (AHRC); and AH Plus/Reciproc Blue (AHRB). Then, the samples were scanned under micro-CT after obturation and removal of the filling material. Two analyses were conducted. First, an evaluation was performed on all the axial images, and another analysis evaluated each millimeter of the 10 mm from the apex. Dentinal defects were observed in all the samples. All of the identified defects in the images after filling material removal were present in the corresponding images after obturation. The use of AH Plus and EndoSequence BC Sealer, and filling material removal using RC and RB instruments did not induce dentinal defects.

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Root dentinal microcracks: a post‐extraction experimental phenomenon?

Cited by 23 publications

References 22 publications

Evaluation of Root-End Preparation with Two Different Endodontic Microsurgery Ultrasonic Tips

Evaluation of Root-End Preparation with Two Different Endodontic Microsurgery Ultrasonic Tips

Resistance to fracture of extracted teeth used for pre‐clinical endodontic procedures: Influence of storage conditions

Micro-CT analysis of dentinal microcracks on root canals filled with a bioceramic sealer and retreated with reciprocating instruments

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