Homework answers / question archive / Original Article Enamel Thickness After Preparation of Tooth for Porcelain Laminate Ayoub Pahlevan1, Mansoreh Mirzaee2?, Esmaeil Yassine3, Ladan Ranjbar Omrany2, Masumeh Hasani Tabatabaee1, Hamid Kermanshah1, Sakineh Arami2, Mehdy Abbasi2 1 Associate Professor, Dental Research Center Dentistry Research Institute, Department of Operative Dentistry, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran 2 Assistant Professor, Dental Research Center Dentistry Research Institute, Department of Operative Dentistry, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran 3 Professor, Dental Research Center Dentistry Research Institute, Department of Operative Dentistry, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran ? Corresponding author: M Mirzaei, Department of Dental Research Center Dentistry Research Institute, Department of Operative Dentistry, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran mir1335@yahoo

Original Article Enamel Thickness After Preparation of Tooth for Porcelain Laminate Ayoub Pahlevan1, Mansoreh Mirzaee2?, Esmaeil Yassine3, Ladan Ranjbar Omrany2, Masumeh Hasani Tabatabaee1, Hamid Kermanshah1, Sakineh Arami2, Mehdy Abbasi2 1 Associate Professor, Dental Research Center Dentistry Research Institute, Department of Operative Dentistry, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran 2 Assistant Professor, Dental Research Center Dentistry Research Institute, Department of Operative Dentistry, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran 3 Professor, Dental Research Center Dentistry Research Institute, Department of Operative Dentistry, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran ? Corresponding author: M Mirzaei, Department of Dental Research Center Dentistry Research Institute, Department of Operative Dentistry, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran mir1335@yahoo

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Original Article Enamel Thickness After Preparation of Tooth for Porcelain Laminate Ayoub Pahlevan1, Mansoreh Mirzaee2?, Esmaeil Yassine3, Ladan Ranjbar Omrany2, Masumeh Hasani Tabatabaee1, Hamid Kermanshah1, Sakineh Arami2, Mehdy Abbasi2 1 Associate Professor, Dental Research Center Dentistry Research Institute, Department of Operative Dentistry, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran 2 Assistant Professor, Dental Research Center Dentistry Research Institute, Department of Operative Dentistry, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran 3 Professor, Dental Research Center Dentistry Research Institute, Department of Operative Dentistry, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran ? Corresponding author: M Mirzaei, Department of Dental Research Center Dentistry Research Institute, Department of Operative Dentistry, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran mir1335@yahoo.com Received: 2 February 2014 Accepted: 7 June 2014 Abstract Objective: In this investigation the thickness of enamel in the gingival, middle, and incisal thirds of the labial surface of the anterior teeth were measured regarding preparation of the teeth for porcelain laminate veneers. Materials and Methods: Part one, 20 extracted intact human maxillary central and lateral incisors ten of each were selected. The teeth were imbedded in autopolimerize acrylic resin. Cross section was preformed through the midline of the incisal, middle and cervical one-third of the labial surface of the teeth. The samples were observed under reflected stereomicroscope and the thickness of enamel was recorded. Part II, the effect of different types of preparation on dentin exposure was evaluated. Thirty maxillary central incisor teeth were randomly divided into two groups: A: Knife-edge preparation. B: Chamfer preparation. All samples were embedded in autopolimerize acrylic resin using a silicon mold. The samples were cut through the midline of the teeth. The surface of the samples were polished and enamel and dentin were observed under the stereomicroscope. Results: Data were analyzed by ANOVA-one way test. The results of this study showed that the least enamel thickness in the central incisor was 345 and in lateral incisor is 235 μ this thickness is related to the one-third labial cervical area. Maximum thickness in maxillary central and lateral incisors in the one-third labial incisal surface was 1260 μ and 1220μ, respectively. In the second part of the study, the tendency of dentinal exposure was shown with the chamfer preparation, but no dentinal exposure was found in the knife-edge preparation. The differences between groups were significant (p