Prefabricated Metal Posts Research Articles

Efectos del uso de diferentes selladores de conductos radiculares y protocolos para limpiar la dentina intrarradicular sobre la fuerza de unión de una resina compuesta utilizada para reforzar raíces debilitadas

Background: This study evaluated the effects of using different root canal sealers and protocols for cleaning intraradicular dentin on the bond strength of a composite resin used to reinforce weakened roots. Material and Methods: Sixty-four roots of extracted human maxillary canines were weakened, prepared and filled with two different endodontic sealers (Endofill and AH Plus). In half of the sample, set aside for each respective sealer, excess filling material was cleaned. In the other half, the weakened areas were not cleaned, and the excess of sealer was spread on the intraradicular dentin. Intentionally worn areas inside each root were restored with a microhybrid light-cure composite resin (Z100) to reinforce them, with and without acid etching. Prefabricated metal posts were fixed with a dual resin cement (RelyX ARC), and the specimens were submitted to a pull-out test. Statistical analysis was performed by means of Shapiro-Wilk, analysis of variance (one-way ANOVA) and Tukey-Kramer tests (pandlt;0.05). Results: The groups filled with Endofill (GI, GII, GIII, GIV) had the lowest bond strength values, which were similar among each other (pandgt;0.05).The greatest bond strength values were observed in roots filled with AH Plus (GV, GVI, GVII, GVIII), mainly without cleaning of the weakened areas, and followed by acid etching (GVII), and also with cleaning of the weakened areas, however, with no acid etching (GVI) (pandlt;0.05). Conclusion: The greatest bond strength values were observed in roots filled with AH Plus; (1) without cleaning of the weakened areas and with acid etching, and; (2) with cleaning of the weakened areas, but without acid etching.

Restoring Partially Edentulous Mandibular Arch Using Prefabricated Metal Posts, Extracoronal Precision Attachment and Computer-aided Design/Computer-aided Manufacturing Prostheses: A Case Report

Restoring Partially Edentulous Mandibular Arch Using Prefabricated Metal Posts, Extracoronal Precision Attachment and Computer-aided Design/Computer-aided Manufacturing Prostheses: A Case Report

PREFABRİKE METAL POST-KOR RESTORASYONLARIN KLİNİK BAŞARISININ DEĞERLENDİRİLMESİ: 5 YILLIK RESTROSPEKTİF ÇALIŞMA

Amaç: Bu retrospektif çalışmanın amacı, prefabrike metal post-kor restorasyonların 5 yıllık kullanım süresi içindeki başarı oranı ve başarısızlık tiplerini değerlendirmektir. Gereç ve Yöntem: Toplam 149 prefabrike metal post ile 5 yıl önce tedavi edilen 85 hastanın kayıtları incelendi ve geri çağrıldı. Yapılan klinik ve radyografik değerlendirmede: post retansiyon kaybı, kron retansiyonunun kaybı, kırık sonrası, kök kırığı, sekonder çürükler, apikal lezyonlar, protez restorasyon tipi (kron / köprü / hareketli bölümlü protez), lokasyonu (üst / alt çene, kesici / köpek / küçük azı / büyük azı dişi) parametreler incelendi. Alınan veriler ile başarı ve başarısızlık oranları hesaplandı. Bulgular: Post-core restorasyonların başarı oranı %91,94 bulundu. En sık görülen başarısızlık çeşidinin protetik restorasyonda restorasyon kaybı (%16.10) ve ardından sekonder çürüklerin (%9,39) olduğu tespit edildi. Postta tutuculuk kaybı başarısızlık oranı %3.35 bulundu. Hiçbir kök kırığı kaydedilmedi. Protetik restorasyon tipine göre başarısızlık oranları hareketli bölümlü protezlerde %23.08, kronda %8.64 ve köprü restorasyonlarında %3.64 bulundu. Sonuç: Sonuçlar post-kor restorasyonların başarı oranının tatmin edici sınırlarda olduğunu gösterdi. Ancak hareketli bölümlü protez vakalarında daha yüksek post tutuculuk kaybı oranı görüldüğünden, hareketli proteze destek dişin post-kor restorasyonlar ile tedavi edilmesine karar verilirken dikkat edilmelidir. Anahtar Kelimeler: Başarı oranı, Post-kor, Tutuculuk kaybı EVALUATION OF CLINICAL SUCCESS OF PREFABRICATED METAL POST-CORE RESTORATIONS: 5 YEAR RETROSFECTIVE STUDY ABSTRACT Aim: The aim of this retrospective study was to evaluate the success rate and failure types of prefabricated metal post-core restorations in 5 years period of usage. Material and methods: The records of 85 patients, who had been treated with 149 prefabricated metal posts were analysed and recalled after 5 years of treatment for clinical and radiological examination. The parameters that were used in the evaluation were: loss of post retention, loss of crown retention, post fracture, root fracture, secondary caries, apical lesions, type of prosthetic restoration (crown / bridgework / removable partial denture), location ( upper / lower jaw, incisor / canine / premolar / molar). The success and failure rates were calculated. Results: The success rate of post-core restorations was 91,94%. Loss of prosthetic restoration retention was the most frequent failure mode (16.10%), followed by secondary caries (9,39%). The failure rate of post retention loss was 3.35%. No root fractures were recorded. The failure rates according to the type of prosthetic restoration were 23.08% in removable partial dentures, 8.64% in crown and 3.64% in bridgework restorations. Conclusion: The results showed that the success rate of post-core restorations were in satisfactory limits. However, since the higher loss of post retention rate was seen in removable partial denture cases, it should be paid attention in deciding to treat the supporting tooth of removable denture with a post-core restoration. Keywords: Success rate, Post-core, Retention loss

In vitro diagnostic accuracy of cone-beam computed tomography with variable gamma values for detection of vertical root fractures in teeth with prefabricated metal posts.

Background:Cone-beam computed tomography (CBCT) has the highest sensitivity and specificity for the detection of vertical root fractures (VRFs). This study aimed to compare the diagnostic accuracy of CBCT with different gamma values for the detection of VRFs.Materials and Methods:In this in vitro, experimental study, multiplanar CBCT scans were obtained from 61 extracted premolars with prefabricated titanium posts using NewTom CBCT scanner. Next, VRFs were artificially induced in all teeth with a mallet, and the teeth underwent CBCT with three different gamma values. The images were evaluated by two observers twice with a 2-week interval for the presence/absence of VRFs. Data were analyzed using the kappa coefficient, McNemar test, and Chi-square test. The sensitivity, specificity, and overall accuracy of CBCT with different gamma values for the detection of VRFs were assessed by receiver operating characteristic curve. The level of significance was lesser than 0.05 (P < 0.05).Results:Changing the gamma value did not change the sensitivity, specificity, or accuracy of CBCT for the detection of VRFs. No significant difference was noted between the two observers in the detection of VRFs on CBCT scans taken with different gamma grades. The inter- and intra-observer agreement were excellent for all gamma grades.Conclusion:Any gamma value preferred by the observer can be used for the detection of VRFs on CBCT scans.

Restoration of Root Filled Teeth; Current Opinions and Techniques

Purpose: To examine current decision-making preferences of Jordanian dentists when Restoring Root Filled Teeth (RFT). Materials and Methods: 834 Jordanian general dentists, prosthodontists and endodontists were invited to participate in a validated online survey with a 62% participation rate. Respondents were invited to answer 24 questions about their preferences for techniques and materials they use to restore RFT. The questions aimed at exploring restorative strategies commonly employed by Jordanian dentists when managing root filled teeth with extensive loss of tooth structure. Results: A minority of dentists consider direct resin restoration as the sole restoration for RFT with extensive loss of tooth structure. Full coverage metal-ceramic and all-ceramic crowns are more popular than endocrowns when restoring RFT with indirect restoration. Fiber posts are the most popular type of posts, followed by prefabricated metal posts. Glass ionomer is the most preferred cement for luting metal posts, while conventional dual resin cement with separate etch and rinse bonding strategy is the most employed when bonding fiber posts. The majority of dentists tend not to pretreat fiber posts. Loss of post/core retention or fracture of coronal tooth structure are the two most common reasons observed by dentists when RFT fail. Conclusion: Use of post and core is still preferred over more conservative approaches when restoring RFT with extensive loss of coronal tooth structure. Longevity of restorations can be enhanced by training practicing dentists on evidence-based adhesive strategies.

Fracture strength of endodontically treated premolars restored with different post systems and metal-ceramic or monolithic zirconia crowns.

The purpose of this study was to investigate the fracture strength of endodontically treated human maxillary premolars (ETP) restored with posts and metal ceramic (MC) or monolithic zirconia (MZ) crowns. Sixty ETP were randomly divided into 3 groups. Teeth in control group (C) received a resin filling. ETP in the MC group were restored with prefabricated metal posts, composite cores and MC crowns while in the MZ group with glass-fiber posts, composite cores and MZ crowns. Half of the specimens were loaded at a 135° angle and half under axial loading until fracture. The fracture modes were divided in repairable and irreparable using optical microscopy. Mean fracture strength was significantly higher for MC than for MZ crowns and control group only under axial loading. The distribution of repairable and irreparable failures presented no significant differences. Crown placement significantly improved the fracture strength of ETP irrespectively of post and crown type.

Comparison of fracture resistance of endodontically treated maxillary first premolar with mesio-occlusal-distal access restored with composite resin, fiber post, and prefabricated metal posts restored with/without full-coverage metal crowns.

Background:A myriad of materials and procedures have been recommended for restoring the root-filled teeth with significant loss of tooth structure and the most common method being the use of “posts.”Material and Methods:A mesio-occluso-distal preparation was done on eighty intact maxillary first premolars, followed by access preparation and cleaning and shaping with rotary files. All samples were obturated and divided into four groups (n = 20). In Group 1, 3-mm gutta-percha was removed and restored using composite resin; Group 2 – Group 1 + crowns; Group 3 – prefabricated fiber post + crowns; and Group 4 – prefabricated metal post + crowns. All the groups were subdivided into eight groups (n = 10), fractured with 90° vertical and 45° oblique loading by a universal testing machine.Statistical Analysis:Fracture resistance was analyzed and compared by means of two-factorial two-way analysis of variance and Scheffe's post hoc test.Results:Under 90° loading, the fracture load of teeth restored with the Nayyar's composite resin core and crown was greatest. Under 45° loading, the fracture load of teeth restored with prefabricated metallic posts was significantly (P < 0.05) less than that in other groups. Under 45° load, group with fiber post exhibited significantly (P < 0.05) more number of favorable fractures than other groups.Conclusion:Under the conditions of vertical and oblique loadings, fiber post and composite resin core with a full-coverage crown is the most effective restorative modality for protecting the remaining tooth structure in pulpless teeth.

Diagnostic Accuracy of Cone-Beam Computed Tomography at Different Tube Voltages for Vertical Root Fractures in Endodontically Treated Teeth with Metallic Posts

Introduction: The study evaluated the effectiveness of different tube voltages of the cone-beam computed tomography (CBCT) device on the diagnosis of vertical root fractures in teeth with single root canals and posts. Materials and methods: Sixty single-canal and single-rooted extracted human mandibular premolars were selected, all of which were intact and contained no fractures. After disinfection, teeth crowns were sectioned and teeth canals were prepped and obturated by a method similar to the rotary technique. Root fractures were created in half of the teeth by applying controlled buccolingual force. Prefabricated metal posts were subsequently placed in all teeth using AH26 sealer. All teeth, both intact and fractured, were mounted in bovine ribs and X-rayed randomly using a CBCT device (Planmeca Romexis, Helsinki, Finland) with three tube voltages (min = 66 kVp, mid = 80 kVp, and max = 92 kVp). Three experienced maxillofacial radiologists observed and commented on the images. Research data were analyzed using SPSS-25 software. Results: Images taken by kVp min were removed from further statistical analysis due to a lack of diagnostic information. For mid (80) and max kVp (92), the sensitivity values were 86.6% and 60 % (P = 0.04), and the specificity values were 33.3% and 30%, respectively (P = 0.45). Overall, observers’ opinions were more alike concerning images taken with kVp mid than kVp max. Conclusion: Apparently, images taken by a tube voltage of 80 kVp are more efficient in the diagnosis of root fractures.

Concepts and Perception of Restoring Endodontically Treated Teeth among Dental Practitioners in Western Region of Saudi Arabia- A Questionnaire Based Study

Introduction: Endodontically Treated Teeth (ETT) are most likely to get fractured, if it is left unrestored compared with the vital teeth due to the loss of tooth structure and reduced modulus of elasticity. Aim: To gain insight into the rationale for choice of endodontic posts and the different endodontic post systems currently used by dental practitioners in western region of Saudi Arabia. Materials and Methods: For this survey-based study, a questionnaire was designed consisting of eight questions to assess the details of why, when and how general practitioners restore ETT and to determine contemporary use of endodontic post from 1st of November 2018 till the end of January 2019. This questionnaire was sent online to 250 private dental practitioners in western region of Saudi Arabia, out of which 202 participants responded. Data was entered in the excel sheet. Descriptive statistics like frequency and proportion was calculated for qualitative data. Results: This study included 202 participants with the mean age group of 25-50 years, out of which 108 (53.4%) male participants and 94 (46.5%) female participants. 120 (59%) of the study sample were general practitioners and 82 (41%) of them were specialists. A total of 60 (29.70) of the study sample were into general practice, reported restoring ETT with post and core followed by the crown, whereas, 30 (14.85%) of them did the crown without post, 15 (7.42%) of them completed restoration with composite and 15 (7.42%) of them did build-up with post and core. An 82 (40.59%) of the study sample who were specialists, reported restoring ETT with post and core build-up and then proceed with crowns. An 80 (39.60%) of the study sample were into general practice, reported using prefabricated fiber post whereas, 23 (11.38%) of them using cast post and 17(8.41%) of them using prefabricated metal posts. 72 (35.64%) of the study sample were specialists reported using prefabricated fiber posts and 10 (4.95%) of them used cast metal post. Conclusion: Based on the results of the study, it can be concluded that majority of the participants practiced reinforcement of ETT by using fiber posts with resin cements followed by crowns.

Association between the Number of Walls Present and Teeth Restored with Prefabricated Metal Posts in Mandibular Molars - A Retrospective Analysis

Association between the Number of Walls Present and Teeth Restored with Prefabricated Metal Posts in Mandibular Molars - A Retrospective Analysis

Association of Age, Tooth related and Gender distribution in patients undergoing Prefabricated Metal Post

A root canal treatment will have a loss of coronal and radicular tooth structure. This will affect the anchorage of the teeth. Therefore, post- retained crowns are indicated to prevent fracture. The study aims to associate age, tooth-related and gender distribution in patients undergoing prefabricated metal post after root canal treatment. The details of the 86,000 patient records were reviewed and analysed from DIAS (dental information archiving system), out of which 451 case records of the patients who underwent prefabricated posts after root canal treatment were retrieved. The collected data were cross-verified and compiled together in an excel sheet. Compiled data were statistically analysed with the help of SPSS software (23.0). In this study, we can contemplate that there is a significant association between age and type of teeth underwent prefabricated metal posts, l8-30 yrs of age group patients had more posts after root canal treatment compared with other age groups (p&lt;0.05). On comparing the gender to the type of teeth which had posted after root canal treatment, female patients had more number of posts compared to male patients. There is a significant difference seen (p &lt; 0.05). Within the limitations of the study, maxillary premolars are predominantly used prefabricated metal post in females. Mandibular molars are commonly treated among male patients and maximum metal post are given after root canal treatment in less than 40 years of age as the masticatory forces are more, so to support the remaining tooth structure rigid posts are required after root canal treatment.

Comparative Analysis of Different Sizes of Prefabricated Metal Posts Placed in Relation to Premolars- A Retrospective Analysis

Endodontically treated teeth which have extensive structural defects due to caries, access cavitypreparation require post and core management for retention purpose.The clinical decision as to whetheran endodontically treated tooth requires a post and a crown poses a challenge to dental practitioners.Thisstudy aims at comparing different sizes of prefabricated metal posts in relation to endodontically treatedpremolars.This retrospective clinical study evaluated the patients who received prefabricated metal postsin endodontically treated premolars in Saveetha dental college, Chennai from June 2019 to March 2020.Over 373 patients records of prefabricated metal posts, 157 cases were selected based on the inclusion andexclusion criteria.The collected data was imported to excel sheet , analysed using SPSS software.Resultsshowed that the Group B (post size-2)(diameter of 0.85mm) reported greater preferences than other groupsin relation to prefabricated metal posts in endodontically treated premolars.The comparative analysis inrelation to endodontically treated premolars with prefabricated metal posts showed post size of 2(diameterof 0.85mm) showed greater preferences than other groups.

Evaluation of Tensile Bond Strength of Metallic Prefabricated Posts Cemented with Different Luting Agents

Objective: To assess the tensile bond strength of prefabricated metal posts cemented with different luting agents. Material and Methods: Fifty single-rooted endodontically treated human teeth had their crowns cut, mounted into acrylic-resin blocks and then an 8mm depth post space were prepared. Prefabricated cylindrical metal posts were cemented using different luting agents: a zinc phosphate cement (SS White), a conventional glass ionomer cement (Vidrion C), two resin-modified glass ionomer cements (Vitremer and RelyX Luting 2) and a resin cement (RelyX ARC). Samples were stored in distilled water for seven days and then submitted to a tensile bond strength test until complete dislocation of the post. One-way analysis of variance and Tukey test for pairwise multiple comparisons were used to evaluate differences between luting agents . Results: Tensile bond strength was 563.88±203.41 N for zinc phosphate cement, 336.86 ± 137.64 N for Vidrion C, 515.24 ± 239.48 N for Vitremer, 828.47±433.99 N for RelyX Luting 2 and 1262.51 ± 356.29 for RelyX ARC. The Relyx ARC presented the highest tensile bond strength regard the luting agent tested (p< 0.05) . Conclusion: RelyX ARC presented the higher tensile bond strength compared to the other luting agents evaluated.

Retrospective analysis of survival rates of post-and-cores in a dental school setting

Statement of problemThe clinical survival of different types of post-and-core systems requires assessment. PurposeThe purpose of this retrospective clinical study was to evaluate the clinical survival rate (CSR) of custom-fabricated cast metal and prefabricated (both metal- and fiber-reinforced composite resin post) post-and-cores as a function of patient- and restoration-related variables. Material and methodsA retrospective analysis was conducted on electronic charts indicating that these patients had received some type of post-and-core between January 2003 and January 2018. A total of 754 records were included in the analysis based on the inclusion criteria. Data were analyzed by using the Kaplan-Meier and Cox proportional hazards analysis. ResultsKaplan-Meier analysis demonstrated the mean survival time for each group to be 12.0 years for fiber-reinforced composite resin posts, 11.8 years for cast metal post-and-cores, and 10.2 years for prefabricated metal posts. Although the mean survival time differed by 1.8 years among groups, with prefabricated metal posts having a slightly higher risk of failure, this effect was not statistically significant (P=.067). The effect of post type also failed to reach significance when controlling for patient demographics and post position in a Cox proportional hazards analysis (P=.106). However, the Cox model did show that survival was associated with tooth position (P=.003), cement (P=.021), and type of restoration (P<.001). ConclusionsAnalysis showed no evidence that post-and-core survival was significantly associated with 3 types of post-and-cores (custom-fabricated metal, prefabricated metal, and prefabricated fiber-reinforced composite resin). The percentage of root in the bone, tooth position, cement, and type of restoration, however, were significantly associated with survival.

Comparative evaluation of the effect of surface treatment of fiber-reinforced posts and prefabricated metal posts on adhesion of a resin-based luting cement: An in vitro study.

Background:The purpose of this study was to evaluate the effect of surface treatment of fiber-reinforce post and metal post of adhesion of a resin luting cement.Materials and Methods:Sixty methyl methacrylate specimens were fabricated with a customized metal rod. The samples were segregated into six groups (F1, F2, F3, M1, M2, and M3) of 10 specimens (n = 10) each. The first three groups (F1, F2, and F3) were for fiber posts and (M1, M2, and M3) were for metal posts. The postspace preparation was done with dedicated drills supplied by the postmanufacturers to a length of 14 mm. F1 and M1 were the control groups. The posts in F2 and M2 groups were treated with airborne-particle abrasion with 70 μm Al2O3 particles for 5 s at a constant distance of 20 mm, cleaned with alcohol and cemented in the postspace. The posts in the F3 and M3 groups were treated with airborne-particle abrasion followed by primer application. After cementing the posts into the postspace, the acrylic blocks were sectioned with a motor-driven jigsaw to obtain four specimens each of 3-mm thickness. These sections were then subjected to push-out tests on a universal testing machine.Results:There was a statistically significant increase in the bond strength of both fiber and metal posts to resin cement after airborne-particle abrasion with Al2O3 particles and airborne abrasion followed by primer application.Conclusion:There is an increase in the bond strength of the resin cement with the prefabricated posts after the various surface treatments.

Fracture Strength of Flared Root Canals Restored with Different Post Systems.

Objective:To evaluate the fracture resistance of different intra-radicular post systems in flared root canals.Methods:Sixty human canines were used. The coronal portion was removed and the root length was standardized at 17 mm. Canals were prepared and filled with gutta-percha/AH Plus sealer. Roots were embedded in self-polymerising acrylic resin blocks. According to the material used, the teeth were randomly divided into three groups (n=20): glass fibre post (GFP): GFP and Z350 resin composite core; pre-fabricated metal post (PMP): PMP and Z350 resin composite core; and cast metal core (CMC): CMC with silver-tin alloy. Coronal reconstruction involved fabrication of metal copings. Samples were submitted to mechanical compression testing at 45º in a universal test machine. Fracture pattern was evaluated under a stereoscope. The fracture strength values were submitted to one-way analysis of variance (ANOVA) and Tukey tests (α=0.05).Results:There was no statistically significant difference between the resistance values among groups (P=0.193). With regard to fracture pattern, GFP showed 55% and PMP 45% of Type I fractures, which considered repairable or favourable, whereas MCC presented 50% of Type V, which was considered irreparable or unfavourable.Conclusion:Glass fibre and pre-fabricated metal posts have good fracture resistance to compression and may be used for restoring flared root canals, since they presented fractures mainly involving the filling core, thus facilitating later repair.

Fracture Strength of Flared Root Canals Restored with Different Post Systems

Objective To evaluate the fracture resistance of different intra-radicular post systems in flared root canals. Methods Sixty human canines were used. The coronal portion was removed and the root length was standardized at 17 mm. Canals were prepared and filled with gutta-percha/AH Plus sealer. Roots were embedded in self-polymerising acrylic resin blocks. According to the material used, the teeth were randomly divided into three groups (n=20): glass fibre post (GFP): GFP and Z350 resin composite core; pre-fabricated metal post (PMP): PMP and Z350 resin composite core; and cast metal core (CMC): CMC with silver-tin alloy. Coronal reconstruction involved fabrication of metal copings. Samples were submitted to mechanical compression testing at 45o in a universal test machine. Fracture pattern was evaluated under a stereoscope. The fracture strength values were submitted to one-way analysis of variance (ANOVA) and Tukey tests (α=0.05). Results There was no statistically significant difference between the resistance values among groups (P=0.193). With regard to fracture pattern, GFP showed 55% and PMP 45% of Type I fractures, which considered repairable or favourable, whereas MCC presented 50% of Type V, which was considered irreparable or unfavourable. Conclusion Glass fibre and pre-fabricated metal posts have good fracture resistance to compression and may be used for restoring flared root canals, since they presented fractures mainly involving the filling core, thus facilitating later repair.

A Comparative Evaluation of Fracture Resistance of Endodontically Treated Teeth restored with Composite Resin Core using Two Different Designs of Prefabricated Metal Posts: An in vitro Study

ABSTRACTAimTo comparatively evaluate the fracture resistance of endodontically treated teeth restored with light-cured composite resin core using two different designs of prefabricated metal posts.Materials and methodsA total of 30 single-rooted anterior teeth were selected for the study and endodontically treated. Teeth were sectioned 2 mm above the cementoenamel junction and were randomly divided into two groups (n = 15). Teeth in group I were restored with Parallel post—EG post and group II with parallel post with coronal flare—i post. Light-cured composite core buildup was done in all samples using a customized core former. Compressive load was applied at a 135° angle to the long axis of the tooth at a cross-head speed of 1 mm/minute until visible signs of fracture were observed. Levene's test and t-test were used to determine the difference of the failure loads between the groups (α = 0.05).ResultsThe mean values (standard deviation [SD]) for fracture resistance were 295.55 N and 469.59 N for parallel post—EG post and parallel post with coronal flare—i post respectively. Since the p-value for thet-test is less than 0.05, it indicates that we should reject null hypothesis and conclude that the mean fracture load of parallel post with coronal flare—i post is significantly more than that of mean fracture load of parallel post—EG post.ConclusionThe study conducted evaluated that the fracture resistance of endodontically treated teeth with parallel post with coronal flare—i post and core buildup had better strength as compared with parallel post—EG post and core buildup.Clinical significanceThe present study will help the clinician to select the appropriate prefabricated metal post that will fit exactly into the coronal flare of the canal improving clinical performance, thus increasing the longevity of the restoration.How to cite this articleGaikwad AM, Shah N, Ram SM. A Comparative Evaluation of Fracture Resistance of Endodontically Treated Teeth restored with Composite Resin Core using Two Different Designs of Prefabricated Metal Posts: Anin vitroStudy. J Contemp Dent 2017;7(2):97-102.

"Evaluation of fracture strength of teeth restored with different types of posts luted with different luting cements": an in vitrostudy.

The aim was to evaluate the incidence of root fracture of endodontically treated teeth reinforced with glass-fiber posts and metal posts luted with different luting cements. Forty maxillary central incisors were sectioned at 1 mm of the cementoenamel junction and endodontically treated. The teeth were divided into four groups (n = 10) and restored with prefabricated metal posts and glass-fiber posts luted with resin-based luting cement and glass ionomer cement. Core built up was done using composite resin. The fracture strength was evaluated using an Instron universal testing machine (Model 4206, Instron Corp., Canton, MA). The results were recorded. The Kruskal-Wallis test analysis test was used to analyze the data. Prefabricated metal post was statistically superior to the glass-fiber posts. Posts luted with resin-based luting cement were superior in fracture strength than glass ionomer cement. Teeth restored with prefabricated metal posts present higher fracture strength than those reinforced with glass-fiber posts. Posts luted with resin-based luting cement showed higher fracture strength than glass ionomer cement.

A Comparative Evaluation of Stress Distribution by Three Different Designs of Prefabricated Metal Posts on Endodontically Treated Permanent Maxillary Central Incisor: A Three-dimensional Finite Element Study

ABSTRACTPurpose of the study: This study intends to evaluate and compare the stress distribution by three designs of prefabricated metal posts, parallel post (EG post), parallel post with coronal flare (i-post) and a tapered post (Filpost) in endodontically treated permanent maxillary central incisor. This study will help the dentists to choose the post that would generate the least stress in endodontically treated teeth.ProcedureThree-dimensional (3D) finite element models were developed. The physical models include composite resin core material, dentin, endodontic post, luting cement and guttapercha. They were subjected to compressive load of 100 N at 135° angle with respect to longitudinal axis of tooth, above the level of cingulum, simulating the load condition in oral cavity and the effects of three posts on stress distribution, in endodontically treated maxillary central incisor was evaluated.ResultsStress distribution was found to be better in the models having parallel post and parallel post with the coronal flare. Coronal flare has an added advantage of better fit in the root canal.ConclusionIt was found that the stresses in maxillary central incisor with the parallel post with coronal flare were well distributed.How to cite this articleMengal GP, Nadgere J, Ram SM, Shah N. A Comparative Evaluation of Stress Distribution by Three Different Designs of Prefabricated Metal Posts on Endodontically Treated Permanent Maxillary Central Incisor: A Three-dimensional Finite Element Study. J Contemp Dent 2015;5(3):123-130.