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Enamel regeneration

Carlos Parra, Y Natalie Jeong, Charles E Hawley
Recession on the lingual aspect of mandibular incisors may occur in patients with history of tongue piercing and other factitious traumatic habits. Treatment of these areas is challenging due to the site-specific anatomical features of the region. This case report presents a novel approach for a specific type of mandibular lingual defect caused by tongue piercing. A nonresorbable titanium-reinforced barrier membrane combined with an allograft and enamel matrix derivatives was used to promote regeneration of periodontal attachment...
November 2016: International Journal of Periodontics & Restorative Dentistry
Mario Aimetti, Francesco Ferrarotti, Giulia Mariani, Adriano Fratini, Marta Giraudi, Federica Romano
The present case series evaluated the potential benefits of a flapless approach in the regenerative treatment of residual deep intrabony defects. In each of 11 patients, one periodontal defect with an intrabony component of ≥ 3 mm was treated regeneratively using enamel matrix derivative combined with a closed surgical technique. Clinical and radiographic parameters were recorded at baseline and at 12 and 24 months postoperatively. All defects experienced favorable clinical and radiographic outcomes at the 24-month follow-up...
November 2016: International Journal of Periodontics & Restorative Dentistry
Amer Sehic, Amela Tulek, Cuong Khuu, Minou Nirvani, Lars Peter Sand, Tor Paaske Utheim
MicroRNAs (miRNAs) are a class of small, non-coding RNAs that provide an efficient pathway for regulation of gene expression at a post-transcriptional level. Tooth development is regulated by a complex network of cell-cell signaling during all steps of organogenesis. Most of the congenital dental defects in humans are caused by mutations in genes involved in developmental regulatory networks. Whereas the developmental morphological stages of the tooth development already are thoroughly documented, the implicated genetic network is still under investigation...
October 7, 2016: Gene
Takaaki Tsunematsu, Natsumi Fujiwara, Maki Yoshida, Yukihiro Takayama, Satoko Kujiraoka, Guangying Qi, Masae Kitagawa, Tomoyuki Kondo, Akiko Yamada, Rieko Arakaki, Mutsumi Miyauchi, Ikuko Ogawa, Yoshihiro Abiko, Hiroki Nikawa, Shinya Murakami, Takashi Takata, Naozumi Ishimaru, Yasusei Kudo
Epithelial cell rests of Malassez (ERM) are quiescent epithelial remnants of the Hertwig's epithelial root sheath (HERS) that are involved in the formation of tooth roots. ERM cells are unique epithelial cells that remain in periodontal tissues throughout adult life. They have a functional role in the repair/regeneration of cement or enamel. Here, we isolated odontogenic epithelial cells from ERM in the periodontal ligament, and the cells were spontaneously immortalized. Immortalized odontogenic epithelial (iOdE) cells had the ability to form spheroids and expressed stem cell-related genes...
October 2016: Laboratory Investigation; a Journal of Technical Methods and Pathology
Yoichi Taniguchi, Akira Aoki, Kazuto Sakai, Koji Mizutani, Walter Meinzer, Yuichi Izumi
The objective of this study was to evaluate an Er:YAG laser (ErL) application for periodontal regenerative surgery in angular bone defects at nine sites in six patients. Debridement was thoroughly performed using a combination of curettage with a Gracey-type curette and ErL irradiation at a panel setting of 70 mJ/pulse and 20 Hz with sterile saline spray. After applying an enamel matrix derivative and autogenous bone grafting, ErL was used to form a blood clot coagulation on the grafted bone surface at 50 mJ/pulse and 20 Hz without water spray for approximately 30 seconds...
July 2016: International Journal of Periodontics & Restorative Dentistry
Carlo Ghezzi, Luca Ferrantino, Luigi Bernardini, Margherita Lencioni, Silvia Masiero
The purpose of this study was to compare two minimally invasive surgical techniques (MISTs) for the treatment of periodontal defects: (1) guided tissue regeneration (GTR) using resorbable minimembrane and particulate xenograft (DBBM); and (2) inductive periodontal regeneration (IPR) using enamel matrix derivatives and DBBM. A sample of 20 infrabony periodontal defects in 20 patients were randomly assigned to either the GTR or the IPR group. A follow-up was performed at 12 months postoperative. Significant improvement in clinical parameters was observed in both groups, although no intergroup differences were found...
July 2016: International Journal of Periodontics & Restorative Dentistry
Sabine Groeger, Anita Windhorst, Joerg Meyle
BACKGROUND: In periodontal therapy enamel matrix derivative (EMD) has been successfully used for tissue regeneration by altering activity of various cells involved in periodontal regeneration. Studies have focused primarily on clinical parameters and outcome. Effects of EMD on oral epithelial cells are of crucial importance in order to understand the biology of regeneration. Aims of this study are to investigate proliferative and cytotoxic effects of EMD on oral epithelial cells and their possible influences on epithelial barrier function...
October 2016: Journal of Periodontology
R Kunimatsu, Y Yoshimi, N Hirose, T Awada, M Miyauchi, T Takata, W Li, L Zhu, P K Denbesten, K Tanimoto
BACKGROUND AND OBJECTIVES: Amelogenin proteins are the major constituent of developing extracellular enamel matrix and are believed to have an exclusively epithelial origin. Recent studies have suggested that amelogenins might induce the differentiation and maturation of various cells, including cementoblast lineage cells. However, the residues comprising the active site of amelogenin remain unclear. The purpose of this study was to identify the active site region of amelogenin by studying the effects of amelogenin fragments on the osteogenic differentiation of cementoblasts...
May 5, 2016: Journal of Periodontal Research
Ichiro Sasagawa, Shunya Oka, Masato Mikami, Hiroyuki Yokosuka, Mikio Ishiyama, Akane Imai, Hitoyata Shimokawa, Takashi Uchida
In order to compare its characteristics with those of jaw tooth collar enamel, normally developing and experimentally regenerating ganoine from ganoid scales of Lepisosteus oculatus (spotted gar), an actinopterygian fish species, was examined by Western blotting and immunohistochemistry. Amelogenin, a major enamel matrix protein (EMP), is widely found from sarcopterygian fish to mammals. Therefore, we used antimammalian amelogenin antibodies and antisera: an antibody against bovine amelogenin; antiserum against porcine amelogenin; and region-specific antibodies or antiserum against the C-terminus, middle region, or N-terminus of porcine amelogenin in this study...
May 2016: Journal of Experimental Zoology. Part B, Molecular and Developmental Evolution
Mahmoud Abu-Ta'a
AIM: This randomized clinical trial compares the usefulness of adjunctive antibiotics, while strict asepsis was followed during periodontal surgery involving guided tissue regeneration. MATERIALS AND METHODS: Two groups of 20 consecutive patients each with advanced periodontal disease were randomly assigned to treatment. They displayed one angular defect each with an intrabony component ≥3 mm, probing pocket depth and probing attachment level (PAL) ≥7 mm. Test group included 13 males, mean age 60 years, treated with enamel matrix derivative (EMD) and demineralized freeze-dried bone allograft with modified papilla preservation technique, received oral amoxicillin 1 gm, 1 hour preoperatively and 2 gm for 2 days postoperatively...
January 2016: Journal of Contemporary Dental Practice
Bin Jin, Pill-Hoon Choung
Dental caries, the most prevalent oral disease in dental patients, involves the phases of demineralization and destruction of tooth hard tissues like enamel, dentin, and cementum. Dentin is a major component of the root and is also the innermost layer that protects the tooth nerve, exposure of which results in pain. In this study, we used human stem cells from apical papilla (hSCAP), which are early progenitor cells, to examine the effects of recombinant human plasminogen activator inhibitor-1 (rhPAI-1) on odontogenic differentiation in vitro and in vivo...
May 2016: Tissue Engineering. Part A
Mario Aimetti, Francesco Ferrarotti, Giulia Maria Mariani, Federica Romano
OBJECTIVES: This investigation was designed to compare the effectiveness of enamel matrix derivative (EMD) proteins in combination with flapless or flap procedure in periodontal regeneration of deep intrabony defects. MATERIALS AND METHODS: Thirty chronic periodontitis patients who had at least one residual periodontal defect with an intrabony component of ≥3 mm were consecutively enrolled. Defects were randomly assigned to test or control treatments which both consisted of the use of EMD to reach periodontal regeneration...
April 5, 2016: Clinical Oral Investigations
Yuki Yoshimi, Ryo Kunimatsu, Naoto Hirose, Tetsuya Awada, Mutsumi Miyauchi, Takashi Takata, Wu Li, Li Zhu, Pamela Denbesten, Kazuo Tanne, Kotaro Tanimoto
BACKGROUND: Extracts of enamel matrix proteins are used to regenerate periodontal tissue; amelogenin, the most abundant enamel protein, plays an important role in this regeneration. Studies have demonstrated that amelogenin fragments promote tissue regeneration, but the bioactive site of amelogenin remains unclear. This study explores the functional domain of amelogenin by investigating effects of four amelogenin species on cementoblast proliferation. METHODS: Four amelogenin species based on amelogenin cleavage products were investigated: 1) recombinant human full-length amelogenin (rh174); 2) amelogenin cleavage product lacking the C-terminal (rh163); 3) amelogenin cleavage product lacking the N-terminal (rh128); and 4) the C-terminal region of rh174 (C11 peptide), which was synthesized and purified...
July 2016: Journal of Periodontology
Karina M M Carneiro, Halei Zhai, Li Zhu, Jeremy A Horst, Melody Sitlin, Mychi Nguyen, Martin Wagner, Cheryl Simpliciano, Melissa Milder, Chun-Long Chen, Paul Ashby, Johan Bonde, Wu Li, Stefan Habelitz
Enamel, the outermost layer of teeth, is an acellular mineralized tissue that cannot regenerate; the mature tissue is composed of high aspect ratio apatite nanocrystals organized into rods and inter-rod regions. Amelogenin constitutes 90% of the protein matrix in developing enamel and plays a central role in guiding the hierarchical organization of apatite crystals observed in mature enamel. To date, a convincing link between amelogenin supramolecular structures and mature enamel has yet to be described, in part because the protein matrix is degraded during tissue maturation...
2016: Scientific Reports
Tsutomu Sugaya, Mahito Tomita, Youji Motoki, Hirofumi Miyaji, Masamitsu Kawamami
BACKGROUND/AIM: The objectives of this study were to histopathologically evaluate cementum regeneration on root surfaces when an enamel matrix derivative (EMD) was used to bond a vertically fractured root and to evaluate the effectiveness of EMD in inhibiting root resorption. MATERIAL AND METHODS: A total of 40 roots from 24 maxillary premolars in beagles were used. The root was vertically fractured using a chisel and mallet. Super-Bond was then used to bond the fractured root...
October 2016: Dental Traumatology: Official Publication of International Association for Dental Traumatology
Richard J Miron, Anton Sculean, David L Cochran, Stuart Froum, Giovanni Zucchelli, Carlos Nemcovsky, Nikos Donos, Staale Petter Lyngstadaas, James Deschner, Michel Dard, Andreas Stavropoulos, Yufeng Zhang, Leonardo Trombelli, Adrian Kasaj, Yoshinori Shirakata, Pierpaolo Cortellini, Maurizio Tonetti, Giulio Rasperini, Søren Jepsen, Dieter D Bosshardt
BACGROUND: On June 5th, 2015 at Europerio 8, a group of leading experts were gathered to discuss what has now been 20 years of documented evidence supporting the clinical use of enamel matrix derivative (EMD). Original experiments led by Lars Hammarström demonstrated that enamel matrix proteins could serve as key regenerative proteins capable of promoting periodontal regeneration including new cementum, with functionally oriented inserting new periodontal ligament fibres, and new alveolar bone formation...
August 2016: Journal of Clinical Periodontology
S Kuchler-Bopp, T Bécavin, T Kökten, J L Weickert, L Keller, H Lesot, E Deveaux, N Benkirane-Jessel
The arrangement of cells within a tissue plays an essential role in organogenesis, including tooth development. Progress is being made to regenerate teeth by reassociating dissociated embryonic dental cells and implanting them in vivo. In the present study, we tested the hanging drop method to study mixed epithelial-mesenchymal cell reorganization in a liquid instead of semisolid medium to see whether it could lead to tooth histogenesis and organogenesis. This method allowed the control of the proportion and number of cells to be used, and the forming microtissues showed homogeneous size...
June 2016: Journal of Dental Research
David Nicolas Morand, Jean-Luc Davideau, François Clauss, Nadia Jessel, Henri Tenenbaum, Olivier Huck
Regeneration of periodontal tissues is one of the main goals of periodontal therapy. However, current treatment, including surgical approach, use of membrane to allow maturation of all periodontal tissues or use of enamel matrix derivatives present limitations in their indications and outcomes leading to the development of new tissue engineering strategies. Several cytokines are considered as key molecules during periodontal destruction process. However, their role during each phase of periodontal wound healing remains unclear...
March 4, 2016: Oral Diseases
Vinod Krishnan, Ankit Bhatia, Harikrishna Varma
OBJECTIVES: Enamel damage resulting or arising from/associated with orthodontic treatment such as white spot lesions and surface deterioration after debonding brackets along with incipient carious lesions are considered problems not amenable for routine restorations due to its invasive nature. The present study was aimed at synthesizing and characterizing nHAp and 25 and 50 mol% strontium nHAp as a surface application modality for dental enamel remineralization/repair. METHODS: 25 and 50 mol% Sr nHAp was synthesized and characterized in comparison with custom made pure nHAp initially with the help of transmission and scanning electron microscopy as well as toxicological assessment...
May 2016: Dental Materials: Official Publication of the Academy of Dental Materials
Richard J Miron, Masako Fujioka-Kobayashi, Yufeng Zhang, Jordi Caballé-Serrano, Yoshinori Shirakata, Dieter D Bosshardt, Daniel Buser, Anton Sculean
BACKGROUND: The use of enamel matrix derivative (EMD) has been shown to facilitate periodontal regeneration by histologically resulting in formation of cementum, periodontal ligament and bone. Recently, a new liquid carrier system for EMD has been introduced with better physicochemical properties specifically designed for bone graft mixing (Osteogain). The aim of this study was to investigate the combination of Osteogain with a bovine-derived natural bone mineral (NBM) on osteoblast migration, adhesion, proliferation and differentiation...
February 26, 2016: Clinical Oral Implants Research
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