Effect of Different Post Materials and Adaptability on Fracture Resistance and Fracture Mode in Human Endodontically Treated Teeth

Abstract

Objective. To investigate the effect of different post materials and adaptability on fracture resistance and fracture mode of endodontically treated teeth. Materials and Methods. Sixty extracted human mandibular premolars were selected and divided into 6 groups (n = 10) according to the restorative method after endodontic treatment: no ferrule presented and restored without fiber post (Group C), 2.0 mm ferrule presented and restored without fiber post (Group CF), restored with D.T. Light-Post (Group PDT), restored with anatomically customized D.T. Light-Post, relined with resin composite (Group ADT), restored with Hi-Rem prosthetic post (Group PHR), and restored with anatomically customized Hi-Rem prosthetic post, relined with resin composite (Group AHR). After restoring with core build-up materials, all specimens were loaded at 45° in a universal testing machine until failure. Visual inspection of all specimens for fracture modes was performed. The data were analyzed using one-way ANOVA, and the fracture mode was reviewed using the chi-square test. Results. Anatomically customized groups presented statistically significant higher fracture resistance than prefabricated groups and group C ( P < 0.05 ). Without post, group CF displayed significantly higher fracture resistance than group C ( P < 0.05 ). Group C, CF, PDT, and PHR showed some specimens with unfavorable fractures. Conclusions. Anatomically customized posts presented highest fracture resistance among all groups. There was no significant difference in fracture mode across all groups.

Adaptation of Relined Fiber Post Using Discontinuous Short Fiber-Reinforced Resin Composite to Restore Weakened Endodontically-Treated Premolars

“…Meanwhile, groups with flared root canals that were restored with anatomically-customized posts (groups 4 and 5) recorded values close to that of the control group (group 1) and had significantly lighter PVS material than groups with flared canals restored with standard, noncustomized posts (group 2, group 3) (see ►Table 2). This outcome is consistent with Bhaktikamala et al17 who reported improved internal adaptation and intimate contact with anatomically-customized FRC posts.…”

“…Likewise, earlier studies have reported that customized post improved intimate contact and adaptation between the customized post and radicular dentin walls, thus, enhancing frictional retention and leading to a homogenous resin cement layer. 17,23 Additionally, Caceres et al 24 conducted purposive microcomputed tomography to evaluate different cementation techniques and found that relined fiber posts presented with improved adaptation with lower void formation than nonrelined fiber posts.…”

“…6 8 13 14 15 This technique involves relining the prefabricated FRC post using several conventional 8 and bulk-fill resin composites 6 to enhance adaptation on the walls of noncircular root canals. The adaptation was improved by fabricating anatomically-customized fiber posts that conform to the anatomy and taper of the root canal, thus limiting the thickness of the resin cement 16 17…”

“…6,8,[13][14][15] This technique involves relining the prefabricated FRC post using several conventional 8 and bulk-fill resin composites 6 to enhance adaptation on the walls of noncircular root canals. The adaptation was improved by fabricating anatomically-customized fiber posts that conform to the anatomy and taper of the root canal, thus limiting the thickness of the resin cement 16,17 Recently introduced bulkfill flowable, discontinuous short fiber-reinforced composite (SFRC) offers advantages and unique properties in restoring large ETT cavities. For instance, SFRC exhibited superior fracture toughness, flexural strength, and modulus compared with conventional resin composite.…”

The Effect of Remaining Coronal Tissue Height on the Fracture Strength of Over-Flared Endodontically Treated Central Incisors Restored Using a Multipost Approach

“…A total of 40 teeth with similar buccolingual root dimensions of 8 ± 0.5 mm and length of 14 ± 0.6 mm distance from the buccal cementoenamel junction (CEJ) to apex were selected after performing measurement using a digital caliper (Mitutoyo Corporation, Kanagawa, Japan) and periapical films. The total sample size was determined using PASS (sample size software) and data from prior research with a similar experimental design [ 13 ]. The suggested sample size was at least eight specimens for each group.…”