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Article
Influence of Preparation Design and Presence of Class IV Composite Resin Restoration on Fracture Resistance of Ceramic laminate Veneer

Authors: Abdulfatah Altabal --- Hala Ragab --- Essam Osman
Journal: Medical Journal of Babylon مجلة بابل الطبية ISSN: 1812156X 23126760 Year: 2015 Volume: 12 Issue: 4 Pages: 1198 -1208
Publisher: Babylon University جامعة بابل

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Abstract

The objective of the study was to evaluate the fracture resistance of ceramic veneer bonded to class IV composite resin restoration using two differentincisal preparation designs.Twenty-eight extracted intact human maxillary incisors free from cracks and of equal dimensions were randomly divided into two main groups; G1 (control): intact teeth without class IV composite restoration, G2: teeth with class IV composite restorations. Each group was further divided according to the preparation design of the laminate veneers (n=7); A: incisal butt joint design and B: incisal overlap design. Class IV was prepared with obliqueincisal margin.Etching and bonding were performed and a nanohybrid composite resin was applied. Two veneer preparation designs were made; butt joint with shoulder finish line and incisal overlap with palatal chamfer. The impression were made usinga 3D-scanner. The veneers were fabricated with a heat pressed all ceramic material (IPS-Emax, IvoclarVivadent) according to manufacturer’s protocol.The internalveneer surface was etched with 5% hydrofluoric acid then silanated.Dual cure resin cement (Variolink N base and catalyst, IvoclarVivadent) wasused for cementation.Fracture resistance measurement was recorded using universal testing machine.The veneer incisal preparation design had a statistically significant effect on mean fracture resistance of PLVs whereas presence of class IV restoration had no statistically significant effect on mean fracture resistance.The incisal overlap design showed statistically significantly higher mean fracture resistance than the incisal butt joint design. The preparation design affected the fracture resistance of PLVs bonded to class IV composite restorations. Yet,the presence of class IV composite restorations did not affectthe fracture resistance of bonded PLVs. The incisal overlap design seemed to protect PLVs bonded to class IV restorations.


Article
Evaluation of the stress concentration of different incisal ridge preparations of porcelain veneers (Finite element analysis)

Author: Abbas F. Al-Huwaizi عباس فيصل الحويزي
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2013 Volume: 25 Issue: 4 Pages: 1-4
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: Porcelain veneers are under a great deal of stress which may lead to clinical failure as fracture ordettachment. This study examined whether different finishing lines and lingual shoulder preparations in the incisalarea of the maxillary central incisor affect the bond of the porcelain veneers.Materials and methods: A two- dimensional finite element model was made. Location and magnitude of maximumVon Mises stresses were calculated in porcelain veneer. Six types of preparations were drawn as:incisal overlap of0.5mm, 1mm and 1.5mm depth and lingual shoulder, and incisal overlap of 0.5mm, 1mm and 1.5mm depth withoutshoulder preparation.Results: Stress formation is maximum in the incisal edge region. All the lingual shoulder preparations presented betterstress distribution than the non shoulder preparationsConclusion: Stress is distributed more evenly when the tested preparation possesses a good thickness of porcelainand the more the surface area with incisal overlap the less possibility of bond failure

Journal of baghdad college of dentistry
مجلة كلية طب الاسنان بغداد

ISSN: 16800087
Publisher: Baghdad University جامعة بغداد
Subject: Dentistry

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Abstract

A quarterly peer reviewed published scientific journal of the College of Dentistry,University of Baghdad.date of first issue 1986

مجلة علمية فصلية تختص بنشر البحوث المتعلقة بعلوم طب الاسنان و الوجه و الفكين تصدر عن كلية طب الاسنان / جامعة بغدادتاريخ اول اصدار 1986

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