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Influence of post materials on the fracture resistance of endodontically treated teeth.

Author: Dr. Biland M. S. Shukri, BDS. M.Sc.* د.بلند محمد سليم
Journal: MUSTANSIRIA DENTAL JOURNAL مجلة المستنصرية لطب الاسنان ISSN: 18138500 Year: 2012 Volume: 9 Issue: 1 Pages: 1-9
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

The bending stiffness of the post should have the ability to transfer and distributeforces and stresses in an endodontically treated tooth to prevent root fracture. The aimof this study was to evaluative the post materials on the fracture resistance ofendodontically treated teeth restored with three types of post materials. Thirtyextracted human mandibular premolars after root canal preparation and obturationwith gutta percha; the roots were divided into three groups according to the type ofpost material, group Fc restored with fiber post, group Sc restored with stainless steelpost and group Tc restored with titanium post. All teeth restored with compositerestorative material as core materials. Then all the teeth were subjected tocompressive load at 130o angle from the horizontal plan at a 5mm/min crossheadspeed until fracture. Results showed that there was a significant different betweengroups in term of fracture loads (P= 0.0301). Also the fracture loads of teeth restoredwith titanium post has highest mean fracture load (830N), whereas teeth restored withFiber post demonstrated the lowest mean fracture load (701.3N). This studyconcluded that the teeth restored with metallic post were more fracture resistant thanthose restored with fiber posts. But the combination of a fiber post and composite corehas the favorable mode of fracture that considered reparable, while consideredunfavorable when restored with metallic post.


Article
The influence of CAD/CAM ceramic and heat processed composite inlays on the fracture resistance of premolars (An in-vitro study)

Authors: Huda A. Abdullah هدى عبد الله --- Inas I. Al-Rawi ايناس الراوي
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2012 Volume: 24 Issue: 4 Pages: 14-18
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: The aim of this in-vitro study was to identify the influence of intracoronal indirect adhesive techniques(heat processed composite (SR Adoro) andcomputer-aided design / computer-assisted manufacturing (CAD/CAM)ceramic (e Max CAD) inlays)on the fracture resistance of maxillary first premolars and to identify the modes offracture of all experimental groups.Materials and Methods: Forty sound freshly extracted upper first premolar teeth were selected then mounted inacrylic blocks, the teeth were divided into four groupsas follow:Group (A): tenintact teeth (control group).Group (B):ten teeth prepared with standardized MOD inlay cavity but not restored. Group(C): ten teeth prepared withstandardized MOD inlay cavity and restored with indirect heat processed composite (SR Adoro).Group (D): ten teethprepared with standardized MOD inlay cavity and restored with CAD /CAM ceramic material (e max CAD).Fracturestrength of the experimented teeth was measured by using universal testing machine (an axial compressiontest).Data were analyzed statistically by ANOVA and least significant difference tests.Results:Group (D) restored with CAD/CAM ceramic inlays showed more resistance to fracture than teeth restoredwith SR Adoro composite inlays group (C), but the values are statistically not significant, using One way ANOVA test ahighly significant differences (P < 0.01) were found among all groups.Conclusions:All CAD/CAM ceramic inlays and 80% of heat processed compositeinlays survived maximum biting forcefor posterior single tooth, so these two types of inlays provide good reinforcement in an extensive MOD cavities inpremolars,The fracture Mode of SR Adoro composite inlays seems to be 80% restorable while CAD/CAM ceramicinlays 90% of it are restorable type of fracture

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