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      Wear of primary teeth caused by opposed all-ceramic or stainless steel crowns


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          This study was conducted to evaluate the effects of full-coverage all-ceramic zirconia, lithium disilicate glass-ceramic, leucite glass-ceramic, or stainless steel crowns on antagonistic primary tooth wear.


          There were four study groups: the stainless steel (Steel) group, the leucite glass-ceramic (Leucite) group, the lithium disilicate glass-ceramic (Lithium) group, and the monolithic zirconia (Zirconia) group. Ten flat crown specimens were prepared per group; opposing teeth were prepared using primary canines. A wear test was conducted over 100,000 chewing cycles using a dual-axis chewing simulator and a 50 N masticating force, and wear losses of antagonistic teeth and restorative materials were calculated using a three-dimensional profiling system and an electronic scale, respectively. Statistical significance was determined using One-way ANOVA and Tukey's test ( P<.05).


          The Leucite group (2.670±1.471 mm 3) showed the greatest amount of antagonist tooth wear, followed by in decreasing order by the Lithium (2.042±0.696 mm 3), Zirconia (1.426±0.477 mm 3), and Steel groups (0.397±0.192 mm 3). Mean volume losses in the Leucite and Lithium groups were significantly greater than in the Steel group ( P<.05). No significant difference was observed between mean volume losses in the Zirconia and Steel groups ( P>.05).


          Leucite glass-ceramic and lithium disilicate glass-ceramic cause more primary tooth wear than stainless steel or zirconia.

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          Most cited references 47

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          Current ceramic materials and systems with clinical recommendations: a systematic review.

          Developments in ceramic core materials such as lithium disilicate, aluminum oxide, and zirconium oxide have allowed more widespread application of all-ceramic restorations over the past 10 years. With a plethora of ceramic materials and systems currently available for use, an overview of the scientific literature on the efficacy of this treatment therapy is indicated. This article reviews the current literature covering all-ceramic materials and systems, with respect to survival, material properties, marginal and internal fit, cementation and bonding, and color and esthetics, and provides clinical recommendations for their use. A comprehensive review of the literature was completed seeking evidence for the treatment of teeth with all-ceramic restorations. A search of English language peer-reviewed literature was undertaken using MEDLINE and PubMed with a focus on evidence-based research articles published between 1996 and 2006. A hand search of relevant dental journals was also completed. Randomized controlled trials, nonrandomized controlled studies, longitudinal experimental clinical studies, longitudinal prospective studies, and longitudinal retrospective studies were reviewed. The last search was conducted on June 12, 2007. Data supporting the clinical application of all-ceramic materials and systems was sought. The literature demonstrates that multiple all-ceramic materials and systems are currently available for clinical use, and there is not a single universal material or system for all clinical situations. The successful application is dependent upon the clinician to match the materials, manufacturing techniques, and cementation or bonding procedures, with the individual clinical situation. Within the scope of this systematic review, there is no evidence to support the universal application of a single ceramic material and system for all clinical situations. Additional longitudinal clinical studies are required to advance the development of ceramic materials and systems.
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            Clinical trials in zirconia: a systematic review.

            Zirconia is unique in its polymorphic crystalline makeup, reported to be sensitive to manufacturing and handling processes, and there is debate about which processing method is least harmful to the final product. Currently, zirconia restorations are manufactured by either soft or hard-milling processes, with the manufacturer of each claiming advantages over the other. Chipping of the veneering porcelain is reported as a common problem and has been labelled as its main clinical setback. The objective of this systematic review is to report on the clinical success of zirconia-based restorations fabricated by both milling processes, in regard to framework fractures and veneering porcelain chipping. A comprehensive review of the literature was completed for in vivo trials on zirconia restorations in MEDLINE and PubMed between 1950 and 2009. A manual hand search of relevant dental journals was also completed. Seventeen clinical trials involving zirconia-based restorations were found, 13 were conducted on fixed partial dentures, two on single crowns and two on zirconia implant abutments, of which 11 were based on soft-milled zirconia and six on hard-milled zirconia. Chipping of the veneering porcelain was a common occurrence, and framework fracture was only observed in soft-milled zirconia. Based on the limited number of short-term in vivo studies, zirconia appears to be suitable for the fabrication of single crowns, and fixed partial dentures and implant abutments providing strict protocols during the manufacturing and delivery process are adhered to. Further long-term prospective studies are necessary to establish the best manufacturing process for zirconia-based restorations.
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              Wear: mechanisms, manifestations and measurement. Report of a workshop.

              The purpose of this workshop was to bring together a tribologist (T.A.S.), a clinician (L.H.M) and a dental materials scientist (R.W.V) to discuss the fundamental mechanisms of wear and how these relate to the manifestations and measurement of wear in dentistry. Eighty delegates contributed to a valuable discussion led by the workshop chairman (C.H.L.).

                Author and article information

                J Adv Prosthodont
                J Adv Prosthodont
                The Journal of Advanced Prosthodontics
                The Korean Academy of Prosthodontics
                February 2016
                23 February 2016
                : 8
                : 1
                : 43-52
                [1 ]Department of Prosthodontics, Dental Research Institute, School of Dentistry, Pusan National University, Yangsan, Republic of Korea.
                [2 ]Woorimi Dental Clinic, Busan, Republic of Korea.
                [3 ]Department of Pediatric Dentistry, Dental Research Institute, School of Dentistry, Pusan National University, Yangsan, Republic of Korea.
                [4 ]Dental Research Institute and Department of Biomaterials Science, School of Dentistry, Seoul National University, Seoul, Republic of Korea.
                [5 ]EZ Plant, Seoul, Republic of Korea.
                Author notes
                Corresponding author: Jung-Bo Huh. Department of Prosthodontics, School of Dentistry, Pusan National University, 20, Geumo-ro, Mulgeum-eup, Yangsan 50612, Republic of Korea. Tel. 82 55 360 5146, huhjb@ 123456pusan.ac.kr

                These authors contributed equally to this work.

                © 2016 The Korean Academy of Prosthodontics

                This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

                Funded by: Pusan National University Dental Hospital;
                Original Article


                leucite porcelain, lithium disilicate porcelain, zirconia, primary tooth, wear


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