Evaluation of the Effect of Different Ferrule Designs on the Fracture Resistance of Endodontically Treated Maxillary Central Incisors Incorporating Fiber Posts, Composite Cores and Crown Restorations

Abstract

Aim:The purpose of this study was to evaluate the fracture resistance of endodontically treated maxillary central incisors restored with quartz fiber posts, composite cores, and crowns when different types of ferrule designs were incorporated. Methods and Materials:Sixty maxillary incisors were divided into six groups: Group 1 (control): teeth with root canal treatments having a full crown prosthesis; Group 2: teeth with a 2 mm circumferential ferrule; Group 3: teeth with a 2 mm ferrule only in the vestibular region; Group 4: teeth with a 2 mm ferrule only in the palatal region; Group 5: teeth with a 2 mm ferrule in the vestibular and palatal region, having cavities in both proximal areas; and Group 6: teeth with no ferrule. The teeth in the experimental groups were restored with quartz fiber posts-composite cores and full metallic crowns. All experimental teeth were subjected to an increasing compressive force with a crosshead speed of 1 mm/min, until fracture occurred. Conclusion:It was concluded different ferrule designs did not have any influence on the fracture resistance of teeth with fiber posts. The results of this study indicate fiber posts can safely be used for their reinforcing properties. Furthermore, there is no significant change in the resistance of teeth with fiber posts regardless of which ferrule design is incorporated. The property of these types of posts is an additional advantage in clinical practice.

Effect of partial ferrule on fracture resistance of endodontically treated teeth: A meta-analysis of <i>in-vitro</i> studies

“…Of these, 51 studies were excluded as ineligible (Table S2). Finally, 17 studies were included in the qualitative and quantitative analysis [11,[13][14][15][16][17]19,24,25,[27][28][29][30][31][32][33][34].…”

“…Table 1 shows the characteristics of the 17 in vitro studies included in this analysis. Regarding the type of teeth, eight used maxillary incisors [11,[14][15][16]24,30,31,34], four used mandibular premolars [17,28,32,33], two used maxillary anterior teeth [19,25], one study used maxillary canines [29], one study used maxillary canines and mandibular premolars [13], and another study used different types of teeth in the same group [27]. A total of 848 teeth were used in these studies to determine the parameters of interest.…”

“…The sample size for each group ranged from 7 to 12 teeth, with most studies using 10 teeth in each group (Table 2). Six studies used glass fiber posts [13,14,17,24,28,32], four used quartz fiber posts [16,19,25,29], three used fiber posts without mentioning the type [30,33,34], and four used cast posts [11,15,27,31]. Nine studies used metal crowns, two used all-ceramic crowns, two used metal copings, and three did not report the type of crown.…”

“…In this context, a number of in vitro studies have been conducted to assess the effect of PF on the fracture resistance of ETT and have reported inconsistent results. While many studies reported inferiority of PF in increasing the fracture resistance compared to CF [11,[13][14][15], others have found comparable results [16,17] or even better outcomes in favor of PF [18,19]. Based on the above-mentioned findings, it seems that there is controversy regarding the effect of PF on the fracture resistance of ETT.…”

Effect of intraradicular reinforcement strategies on the fracture strength of endodontically treated anterior teeth with overflared canals

“…Another important point is the contact angle of the applied force with the sample, which can greatly affect the fracture resistance. The more force parallel to the longitudinal axis of the tooth, the greater the fracture strength ( 24 ).…”