Effect of Hand and Rotary Instruments on the Fracture Resistance of Teeth: An In Vitro Study

Acharya, Nisha R.; Hasan, Riasat; Kafle, Dashrath; Chakradhar, A; Saito, Takashi

doi:10.3390/dj8020038

Cited by 11 publications

(10 citation statements)

References 23 publications

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“…A uniform cement film thickness of 25 and 50 microns has been accepted for luting fixed restorations. To obtain optimal and uniform thickness of the cement, a precise fit of the post in the post space is required [ 7 ] but, due to the irregularities of the root canal morphology or the tapered endodontic preparations, obtaining a precisely fitting post and a uniform film thickness often require extensive post-space preparation that may lead to weakening of the remaining tooth structure, compromising the longevity of endodontically treated teeth [ 8 ]. Therefore, clinicians need to balance a perfect fit of the post inside the root canal with the amount of internal root dentin to be removed.…”

Section: Introductionmentioning

confidence: 99%

Effect of Luting Cement Film Thickness on the Pull-Out Bond Strength of Endodontic Post Systems

et al. 2021

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Optimal bond strength between the prefabricated post/dowel to the surrounding dentin is essential. The present study aimed to analyze and compare the effect of three different cement film thicknesses on the pull-out bond strength of three different prefabricated post systems. Extracted natural teeth (N = 90) with similar root dimensions were acquired. Teeth were mounted in resin blocks, endodontically treated, sectioned at cemento-enamel junction, divided into three groups (A: Parapost Fiber Lux plus; B: 3M ESPE Relyx fiber post; and C: Parapost XP), and stored. Uniform post spaces were prepared for the groups (A and C: Length = 8 mm, Width = 1.5 mm; B: Length = 8 mm, Width = 1.6 mm). Each group (N = 30) was further subdivided into three subgroups (n = 10) based on the size (4, 5, and 6) of the post and cemented with resin cement (MultiLink-N, Ivoclar Vivadent). After thermocycling, the specimens were subjected to a pull-out test using a universal testing machine, and tensile force was recorded (MPa). Digital microscopic evaluations were performed for modes of failure. ANOVA and Tukey-HSD tests were used for statistics. Significant differences were observed for each tested material (p = 0.000). The lowest and highest bond strength values were recorded for Group C (Titanium post) and Group A (000), respectively. Multiple comparisons showed significance (p < 0.05) among all the groups, except for space 1 and space 2 (p = 0.316) for Group A. Most of the failures occurred within the cement-dentin and post-cement interface (Adhesive failures, 73.5%). An increase in the luting cement film thickness results in the decrease in pull-out bond strength of prefabricated posts luted with resin cement, irrespective of the type/material/shape of the post. The serrated fiber posts showed the highest pull-out bond strength compared to the smooth surfaced fiber posts or serrated metal posts. Increased pull-out bond strengths were observed when appropriate post space was created with the same sized drill as the post size.

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Section: Introductionmentioning

confidence: 99%

Effect of Luting Cement Film Thickness on the Pull-Out Bond Strength of Endodontic Post Systems

et al. 2021

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“…Complete removal of a Type III invagination to create a single canal allows for more precise cleaning and subsequent filling but has the disadvantage of removing a large amount of dental tissue. The loss of tooth structure plays a key role in its long‐term survival [22].…”

Section: Discussionmentioning

confidence: 99%

Conservative management of dens in dente

Castelo‐Baz,

Gancedo‐Gancedo,

Pereira‐Lores

et al. 2023

Aust Endodontic J

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Dens Invaginatus (DI) or dens in dente is an uncommon anomaly which mostly affects permanent lateral incisors, and it is very rare in molars. This article presents the conservative endodontic management of four different cases of DI and a discussion of the endodontic literature for this malformation. Three upper lateral incisors Type II, IIIa and IIIb, and an upper first molar Type II are shown. The most conservative approach possible was carried out. Three of the cases were obturated using the continuous wave technique. In one of the cases, it was possible to treat only the invagination with MTA and preserve the pulp vitality of the main canal. To make a correct diagnosis and to treat in the most conservative way possible, a DI is necessary to know its classification and use tools such as CBCT and magnification.

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“…Tooth fracture is considered to be one of the most undesirable outcomes of endodontically treated teeth (ETT) (1). The strength, integrity, and pattern of force distribution during mastication have been reported as they have a great impact on ETT (2,3). ETT being susceptible to fracture is related to the loss of tooth structure due to caries or during different endodontic procedures; such as access cavity and canal preparations (4).…”

Section: Introductionmentioning

confidence: 99%

“…ETT being susceptible to fracture is related to the loss of tooth structure due to caries or during different endodontic procedures; such as access cavity and canal preparations (4). Therefore; maintaining the tooth structure not only increases the fracture resistance but also preserves its structural integrity (3). Minimally invasive endodontics (MIE) is a concept that focuses on minimal mechanical shaping and preparation as this leads to better maintaining the original canal anatomy (5).…”

Section: Introductionmentioning

confidence: 99%

Fracture Resistance Evaluation After Minimal Invasive Preparation Using Trunatomy Versus Protaper Next (A Comparative in Vitro Study)

Hegazi

Sherif

Aboelseoud

et al. 2023

Alexandria Dental Journal

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INTRODUCTION:Minimally invasive endodontics (MIE) is the latest innovation in endodontics that focuses on minimal mechanical preparation; as it leads to preserving the fracture strength of teeth. AIM OF THE STUDY:To compare the fracture resistance of mandibular molars following preparation by TruNatomy versus ProTaper Next rotary instruments. MATERIALS AND METHODS: Thirty permanent mandibular molars were selected in this study. Teeth were randomly distributed into two equal groups. Decoronation of the crown was done and the distal root was sectioned from the mesial root and acted as a control group. Study Group I: Fifteen mesial roots (MB and ML canals) were prepared using TruNatomy (TRN) rotary files up to the prime file (26/.04). Study Group II: Fifteen mesial roots were prepared using ProTaper Next (PTN) rotary files to size X3(30/.07). Control Group: The distal root of each tooth. Roots were placed in acrylic resin blocks and fracture loading was applied. Data were statistically analyzed. RESULTS: Roots prepared with TRN were significantly more fracture resistant than roots prepared with PTN. In addition, a significant difference was noted between the mesial and distal roots within each group. CONCLUSIONS: Mandibular molar mesial roots prepared with TRN rotary files (26/.04) are significantly more fracture resistant than those prepared with PTN rotary files (30/.07). In addition, intact mandibular molar distal roots were significantly less prone to fracture than the mesial roots prepared with both systems.

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Effect of Hand and Rotary Instruments on the Fracture Resistance of Teeth: An In Vitro Study

Cited by 11 publications

References 23 publications

Effect of Luting Cement Film Thickness on the Pull-Out Bond Strength of Endodontic Post Systems

Effect of Luting Cement Film Thickness on the Pull-Out Bond Strength of Endodontic Post Systems

Conservative management of dens in dente

Fracture Resistance Evaluation After Minimal Invasive Preparation Using Trunatomy Versus Protaper Next (A Comparative in Vitro Study)

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