DOCSLIB.ORG

A Clinical Study

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
A Clinical Study 541 The Shape of the Maxillary Central Incisors and Its Correlation with Maxillary Anterior Papillary Display: A Clinical Study Ashish S. Nichani, BDS, MDS1 The shape and form of the teeth Arshia Zainab A. Jameel Ahmed, BDS2 have been reported to affect the V. Ranganath, BDS, MDS3 morphology of the periodontium.1 Early pragmatic reports implied that the position of the gingival mar- gin influenced the convexity of the The aim of this study was to define shapes of maxillary central incisors and tooth in the cervical area.2,3 determine their relationship with the visual display of interdental papillae during Ochsenbein and Ross in 1969 smiling. A sample of 100 patients aged 20 to 25 years were recruited. Photographs were the first to describe the types were taken and gingival angle, crown width (CW), crown length (CL), contact of gingival anatomy as flat and high- surface (CS), CW/CL ratio, CS/CL ratio, gingival smile line (GSL), and interdental smile line (ISL) were measured. The data showed an increase in GA leading ly scalloped. They reported that a to an increase in CW and CS/CL ratio. Women showed a higher percentage square tooth was associated with of papillary display compared with men. This study reinforces the proposed a flat gingiva, whereas a tapered hypothesis that the shape of the teeth and papilla affect the periodontium. tooth had a scalloped gingiva, and Int J Periodontics Restorative Dent 2016;36:541–547. doi: 10.11607/prd.2559 that the gingival contour followed the contour of the underlying al- veolar bone.4 The term periodontal biotype was later defined by Seibert and Lindhe, who classified gingiva as either thin-scalloped or thick-flat.5 Tooth shape has been classi- fied time and again into triangular, ovoid, or square forms. Patients with triangular teeth due to their soft tis- sue biotype and high scalloped gin- gival margin have been known to be more vulnerable to open embrasure spaces leading to formation of black 1 Professor, Department of Periodontology, AECS Maaruti College of Dental Sciences and triangles.1 The width and height of Research Centre, Bangalore, India. 2Postgraduate Student, Department of Periodontology, AECS Maaruti College of Dental anterior teeth help the dentist de- Sciences and Research Centre, Bangalore, India. tect features that are not esthetically 3Professor and Head, Department of Periodontology, AECS Maaruti College of Dental pleasing so that appropriate treat- Sciences and Research Centre, Bangalore, India. ment measures can be provided.6,7 Correspondence to: Dr Ashish S. Nichani, AECS Maaruti College of Dental Sciences and Several components contribute Research Centre, # 108 Hulimavu Tank Band Road, BTM 6th Stage 1st Phase Kammanahalli, to an esthetically pleasing smile, Off Bannerghatta Road, Bangalore 560076, India. such as its ratio with facial outlines, Email: [email protected] tooth shape and color, and the gin- ©2016 by Quintessence Publishing Co Inc. gival contour and exposure.8,9 Volume 36, Number 4, 2016 © 2016 BY QUINTESSENCE PUBLISHING CO, INC. PRINTING OF THIS DOCUMENT IS RESTRICTED TO PERSONAL USE ONLY. NO PART MAY BE REPRODUCED OR TRANSMITTED IN ANY FORM WITHOUT WRITTEN PERMISSION FROM THE PUBLISHER. 542 The supracoronal tissues in pa- the study. The participants had an to the long axis of the tooth; crown tients with a low smile line might not intact maxillary dentition and were width (CW), measured between the always be visible. The appearance in good physical health. Written in- mesiodistal tooth surfaces at the of the interdental papillae in an api- formed consent was obtained from junction between the cervical and cocoronal location during smiling all participants after they were ad- middle sections of the crown length; is critical as it restores the esthetics vised about the nature of the study and contact surface (CS), measured of the gingival architecture.10,11 The according to a protocol approved by from the most apical portion of the high interdental smile line (HISL) the Ethics Committee of the AECS contact area to the most incisal por- and low interdental smile line (LISL) Maaruti College of Dental Scienc- tion on the mesial surfaces of the form an essential element of smile es and Research Centre (157). The central incisors (Fig 1). The narrow- line analysis. Interdental smile line study was conducted in accordance ness of one-third of the apical por- (ISL) describes the postural position with the Helsinki Declaration of 1975, tion of the crown was calculated as of the clinical crown length of the as revised in 2000. Patients with de- CW/CL ratio. The CS/CL ratio was maxillary anterior teeth to the ver- structive periodontal disease, exces- generated by dividing CS by CL. milion border of the upper lip. The sive restorations, traumatized lips, Three additional photographs presence or absence of interdental pregnancy or lactation, current med- were taken that provided a right papillae during smiling is a critical ication use, history of tooth trauma, frontal, frontal, and left frontal view component in the esthetic rehabili- or orthodontic treatment that affect- of each patient during smiling, which tation of a patient.12 ed the thickness of periodontal tis- aided in performing the smile line Tooth shape is crucial when re- sues were excluded from the study. analysis. A high gingival smile line storative procedures are performed A prestudy power analysis indicated (HGSL) displayed the midfacial tis- in the esthetic zone. Esthetics encir- a minimum sample size of 10 to yield sues of all maxillary anterior teeth cles all facets of dentistry, and smile a power of 85% with an α of 5%. upon smiling, whereas a low gingival is considered an effective tool for an- A Williams periodontal probe smile line (LGSL) did not. A variant alyzing optimal esthetic outcomes. (Hu-Friedy) was placed parallel to the of GSL called Cupid’s bow gingival An attempt was made in this study occlusal plane, and photographs were smile line (CB-GSL) did not display to define the shape of the maxillary taken with and without the probe with the midfacial gingiva of the maxil- central incisors into three groups a digital camera (HX300, Sony). lary central incisors but revealed the (triangular, square, and square/ta- midfacial gingival tissues distal to it pered) and to determine the visual (Fig 2). A HISL revealed the interden- display of interdental papillae during Clinical measurements tal papillae of the maxillary anterior smiling in an Indian population. teeth upon smiling, whereas a LISL Computer software (ImageJ, Nation- did not (Fig 3). A Cupid’s bow in- al Institutes of Health) that processes terdental smile line (CB-ISL) did not Materials and methods digital images was used to measure display the interdental papillae of the the assessments. The measurements maxillary central incisors but revealed Subjects assessed included gingival angle interdental papillae distal to it. (GA), which was measured as the A sample of 100 patients (50 men angle that formed between the lines and 50 women) aged 20 to 25 years meeting at the facial gingival margin Data analysis visiting the Outpatient Department from the mesial and distal aspects of of Periodontology at the AECS contact area; crown length (CL), mea- Descriptive statistics was performed Maaruti College of Dental Sciences sured between the most apical por- to statistically demonstrate the cor- and Research Centre, Bangalore, tion of the facial gingival margin and relation between different measure- India, were randomly recruited for the incisal edge of the crown parallel ments regarding the shapes of the The International Journal of Periodontics & Restorative Dentistry © 2016 BY QUINTESSENCE PUBLISHING CO, INC. PRINTING OF THIS DOCUMENT IS RESTRICTED TO PERSONAL USE ONLY. NO PART MAY BE REPRODUCED OR TRANSMITTED IN ANY FORM WITHOUT WRITTEN PERMISSION FROM THE PUBLISHER. 543 a b c d Fig 1 Measurement of (a) gingival angle, (b) crown length, (c) crown width, and (d) contact surface. Fig 2 (a) High gingival smile line. (b) Low gingival smile line. (c) Cupid’s bow gingival smile line. a b c Volume 36, Number 4, 2016 © 2016 BY QUINTESSENCE PUBLISHING CO, INC. PRINTING OF THIS DOCUMENT IS RESTRICTED TO PERSONAL USE ONLY. NO PART MAY BE REPRODUCED OR TRANSMITTED IN ANY FORM WITHOUT WRITTEN PERMISSION FROM THE PUBLISHER. 544 a b Fig 3 (a) High interdental smile line. (b) Low interdental smile line. a b c Fig 4 (a) Triangular central incisors. (b) Square-tapered central incisors. (c) Square central incisors. maxillary central incisors. Pearson additional analysis was done where Pearson correlation revealed a sta- correlation analysis was performed the subjects were grouped in clus- tistically significant correlation be- to assess the correlation between ters using k-means algorithm. The tween the three different groups of different groups of measurements. Euclidean distances of three uniform measurements (Table 1, P < .001). A PowerPoint (Microsoft) presenta- parameters (GA, CW/CL ratio, and ANOVA revealed a statistically sig- tion was made in which the pho- CS/CL ratio) were used, and ANOVA nificant correlation between the tographs of the participants were was applied to search for differenc- three different groups of measure- randomly placed and evaluated es among clusters. ments (Table 2). An increase in by the faculty of periodontal and CS association among the three prosthodontic courses. For each clusters was also seen (Table 3). photograph, the evaluators prompt- Results The subjects were divided into ly categorized the shape of the cen- three groups (triangular, square- tral incisors into one of three groups The data analysis revealed that tapered, square). Results showed (triangular, square-tapered, or increase in GA was directly pro- statistically significant P( < .001) cor- square) (Fig 4). Analysis of variance portional to CS/CL ratio and CW. relations between different mea- (ANOVA) was applied to search for It also implied that if the CW in- surements regarding the shapes of differences among the groups.
Load more

Recommended publications
  • Experimental Induction of Odontoblast Differentiation and Stimulation During Preparative Processes
    Cells and Materials Volume 3 Number 2 Article 8 1993 Experimental Induction of Odontoblast Differentiation and Stimulation During Preparative Processes H. Lesot Institut de Biologie Médicale C. Begue-Kirn Institut de Biologie Médicale M. D. Kubler Institut de Biologie Médicale J. M. Meyer Institut de Biologie Médicale A. J. Smith Dental School, Birmingham See next page for additional authors Follow this and additional works at: https://digitalcommons.usu.edu/cellsandmaterials Part of the Biomedical Engineering and Bioengineering Commons Recommended Citation Lesot, H.; Begue-Kirn, C.; Kubler, M. D.; Meyer, J. M.; Smith, A. J.; Cassidy, N.; and Ruch, J. V. (1993) "Experimental Induction of Odontoblast Differentiation and Stimulation During Preparative Processes," Cells and Materials: Vol. 3 : No. 2 , Article 8. Available at: https://digitalcommons.usu.edu/cellsandmaterials/vol3/iss2/8 This Article is brought to you for free and open access by the Western Dairy Center at DigitalCommons@USU. It has been accepted for inclusion in Cells and Materials by an authorized administrator of DigitalCommons@USU. For more information, please contact [email protected]. Experimental Induction of Odontoblast Differentiation and Stimulation During Preparative Processes Authors H. Lesot, C. Begue-Kirn, M. D. Kubler, J. M. Meyer, A. J. Smith, N. Cassidy, and J. V. Ruch This article is available in Cells and Materials: https://digitalcommons.usu.edu/cellsandmaterials/vol3/iss2/8 Cells and Materials, Vol. 3, No. 2, 1993 (Pages201-217) 1051-6794/93$5. 00 +. 00 Scanning Microscopy International, Chicago (AMF O'Hare), IL 60666 USA EXPERIMENTAL INDUCTION OF ODONTOBLAST DIFFERENTIATION AND STIMULATION DURING REPARATIVE PROCESSES 1 1 1 2 2 1 H.
    [Show full text]
  • Clinical Significance of Dental Anatomy, Histology, Physiology, and Occlusion
    1 Clinical Significance of Dental Anatomy, Histology, Physiology, and Occlusion LEE W. BOUSHELL, JOHN R. STURDEVANT thorough understanding of the histology, physiology, and Incisors are essential for proper esthetics of the smile, facial soft occlusal interactions of the dentition and supporting tissues tissue contours (e.g., lip support), and speech (phonetics). is essential for the restorative dentist. Knowledge of the structuresA of teeth (enamel, dentin, cementum, and pulp) and Canines their relationships to each other and to the supporting structures Canines possess the longest roots of all teeth and are located at is necessary, especially when treating dental caries. The protective the corners of the dental arches. They function in the seizing, function of the tooth form is revealed by its impact on masticatory piercing, tearing, and cutting of food. From a proximal view, the muscle activity, the supporting tissues (osseous and mucosal), and crown also has a triangular shape, with a thick incisal ridge. The the pulp. Proper tooth form contributes to healthy supporting anatomic form of the crown and the length of the root make tissues. The contour and contact relationships of teeth with adjacent canine teeth strong, stable abutments for fixed or removable and opposing teeth are major determinants of muscle function in prostheses. Canines not only serve as important guides in occlusion, mastication, esthetics, speech, and protection. The relationships because of their anchorage and position in the dental arches, but of form to function are especially noteworthy when considering also play a crucial role (along with the incisors) in the esthetics of the shape of the dental arch, proximal contacts, occlusal contacts, the smile and lip support.
    [Show full text]
  • Cell Proliferation Study in Human Tooth Germs
    Cell proliferation study in human tooth germs Vanesa Pereira-Prado1, Gabriela Vigil-Bastitta2, Estefania Sicco3, Ronell Bologna-Molina4, Gabriel Tapia-Repetto5 DOI: 10.22592/ode2018n32a10 Abstract The aim of this study was to determine the expression of MCM4-5-6 in human tooth germs in the bell stage. Materials and methods: Histological samples were collected from four fetal maxillae placed in paraffin at the block archive of the Histology Department of the School of Dentistry, UdelaR. Sections were made for HE routine technique and for immunohistochemistry technique for MCM4-5-6. Results: Different regions of the enamel organ showed 100% positivity in the intermediate layer, a variation from 100% to 0% in the inner epithelium from the cervical loop to the incisal area, and 0% in the stellar reticulum as well as the outer epithelium. Conclusions: The results show and confirm the proliferative action of the different areas of the enamel organ. Keywords: MCM4, MCM5, MCM6, tooth germ, cell proliferation. 1 Molecular Pathology in Stomatology, School of Dentistry, Universidad de la República, Montevideo, Uruguay. ORCID: 0000-0001- 7747-671 2 Molecular Pathology in Stomatology, School of Dentistry, Universidad de la República, Montevideo, Uruguay. ORCID: 0000-0002- 0617-1279 3 Molecular Pathology in Stomatology, School of Dentistry, Universidad de la República, Montevideo, Uruguay. ORCID: 0000-0003- 1137-6866 4 Molecular Pathology in Stomatology, School of Dentistry, Universidad de la República, Montevideo, Uruguay. ORCID: 0000-0001- 9755-4779 5 Histology Department, School of Dentistry, Universidad de la República, Montevideo, Uruguay. ORCID: 0000-0003-4563-9142 78 Odontoestomatología. Vol. XX - Nº 32 - Diciembre 2018 Introduction that all the DNA is replicated (12), and prevents DNA from replicating more than once in the Tooth organogenesis is a process involving a same cell cycle (13).
    [Show full text]
  • Treatment Planning of Dental Implants in the Anterior Maxilla
    Treatment Planning of Dental Implants in the Anterior Maxilla; Risk Assessment and Review of Soft Tissue along with Bone Preservation and Augmentation Techniques for Successful Clinical Outcomes Nkem Obiechina Pannu Dental Associates, 40880 Fremont Boulevard, Fremont, CA Abstract The anterior maxilla continues to present with high potential risk for esthetic failure, and as a result, there is a clear need for modifications that would allow for natural-looking restorations that are harmonious with the rest of the mouth. A number of changes in protocol for placing implants such as using a restorative-driven protocol, the performance of a risk assessment and addressing factors that could compromise esthetics such as deficiencies in bone and soft tissue using bone and soft tissue grafts to ensure adequate tissue volume are necessary for dental implant overall success in the anterior maxilla. Understanding of timing with regard to implant placement has also contributed to achieving esthetic success in the region. This article reviews modifications made in implant placement in the esthetic zone and how they can contribute to functional and esthetic success in the anterior maxilla. Key Words: Dental implants, Risk assessment, Mouth Introduction conditions that can lead to incomplete bone and tooth formation, periimplantitis, mechanical overload, anatomic The anterior maxilla requires careful consideration during preconditions, thin soft tissue as well as lack of keratinized treatment planning dental implant placements due to unique tissue [7]. conditions that are present [1]. When people smile the crowns of their anterior teeth and some soft tissue is usually visible, it is, therefore, essential that implant restorations in the anterior maxilla be harmonious with adjacent natural teeth so as not to distract from a person’s smile.
    [Show full text]
  • Development of Teeth
    DEVELOPMENT OF TEETH Prof. Shaleen Chandra A complex biological process involving epithelial mesenchymal interactions, morphogenesis and mineralization 20 deciduous and 32 permanent teeth Formation of Primary Epithelial Band At thirty seven days of IU development Horseshoe shaped corresponding to future dental arches Prof. Shaleen Chandra Primary epithelial Band Mitosis seen in thickened Oral epithelium at 5th change in the plane of Prof. Shaleen Chandraweek of I.U. life cleavage of cells Dental Lamina Prof. Shaleen Chandra Fate of Dental Lamina: Teeth loose their connection with DL Later on it gets invaded by mesenchyme Remnants of DL may persist as Epithelial pearls or islands within the jaw &/or gingiva Prof. Shaleen Chandra Vestibular Lamina Prof. Shaleen Chandra STAGES OF TOOTH DEVELOPMENT Bud Stage Cap Stage Bell Stage Advanced Bell Stage Prof. Shaleen Chandra STAGES OF TOOTH DEVELOPMENT Bud Stage : Initiation Cap Stage : Proliferation Early Bell Stage : Histo-differentiation Advanced Bell Stage : Morpho-differentiation Prof. Shaleen Chandra Bud Stage Prof. Shaleen Chandra Cap Stage Prof. Shaleen Chandra Cap Stage 2 – Enamel Organ 3 – Dental Papilla 4 – Successional Lamina 5 – Dental Lamina 6 – Dental Sac 7 – Dental Follicle Prof. Shaleen Chandra Bell Stage Prof. Shaleen Chandra Bell Stage Prof. Shaleen Chandra Bell Stage Prof. Shaleen Chandra Advanced Bell Stage Prof. Shaleen Chandra Advenced Bell Stage Showing Formation of Pre-dentin and Enamel Prof. Shaleen Chandra Hertwig’s Epithelial Root Sheath and Root Formation Prof. Shaleen Chandra Hertwig’s Epithelial root sheath and Root Formation Prof. Shaleen Chandra Formation of Root Prof. Shaleen Chandra Formation of root – Multi-rooted teeth Prof. Shaleen Chandra Formation of root – Multi-rooted teeth Prof.
    [Show full text]
  • Anterior Dental Aesthetics: Gingival Perspective
    IN BRIEF • Gingival topography correlates with support from the teeth and underlying bone architecture. • Assessing periodontal biotype and bioform is a prerequisite for prosthodontic and implant treatment planning. • A classification of gingival progression of the anterior maxillary sextant is elementary for 5 creating optimal ‘pink aesthetics’. VERIFIABLE CPD PAPER Anterior dental aesthetics: Gingival perspective I. Ahmad1 The purpose of this series is to convey the principles governing our aesthetic senses. Usually meaning visual perception, aesthetics is not merely limited to the ocular apparatus. The concept of aesthetics encompasses both the time-arts such as music, theatre, literature and film, as well as space-arts such as paintings, sculpture and architecture. INTRODUCTION ANATOMY OF THE DENTOGINGIVAL COMPLEX The gingival perspective is concerned with the soft In cross section, the dentogingival complex is ANTERIOR DENTAL tissue envelope surrounding the teeth. The gingi- composed of three entities: the supra-crestal con- AESTHETICS val texture, shape, tooth-to-tooth progression and nective tissue attachment, epithelial (or junctional 1. Historical perspective its relation to the extra-oral tissues is interdepen- epithelium) attachment and the sulcus (Fig. 1). 2. Facial perspective dent on many factors. These include anatomy of The connective tissue fibres emanate from the 3. Dento-facial perspective the dentogingival complex, tissue hierarchy, osseous crest to the cemento-enamel junction 4. Dental perspective osseous crest considerations, periodontal biotype (CEJ), the epithelial attachment from the CEJ onto 5. Gingival perspective and bioform, tooth morphology, contact points, the tooth enamel, and coronal to the latter is the 6. Psychological perspective* tooth position (gingival progression), and extra- gingival sulcus or crevice.
    [Show full text]
  • Semi Talon and Trace Talon: Report of Two Cases
    Semi talon and Trace talon: report of two cases. R. NEERAJA ABSTRACT. Background Talon cusp is a relatively rare developmental anomaly characterised by the presence of an accessory cusp-like structure projecting from the cingulum area or cemento-enamel junction of the maxillary or mandibular anterior teeth in both the primary and permanent dentition. It is frequently seen in the permanent laterals. Case report The paper presents two cases of talon cusp of semi talon and trace talon type. Key words: Talon cusp; Developmental anomaly; Accessory cusp. Introduction - Type 2 (semitalon): additional cusp of 1 mm or Talon cusp is the name given to the accessory more but extending less than the distance from the tubercles located on the lingual surfaces of anterior cemento-enamel junction to the incisal edge. It teeth [Gündüz and Celenk, 2008]. The talon cusp may blend with the palatal surface or stand away (dens evaginatus of anterior teeth), is a relatively rare from the rest of the crown. developmental anomaly characterised by the presence - Type 3 (trace talon): enlarged or prominent of an accessory cusp-like structure projecting from the cingulum and their variations, i.e., conical, bifid, or cingulum area or cement enamel junction of the tubercle-like. Radiographically it may appear maxillary or mandibular anterior teeth in both the typically as V-shaped radiopaque structure, as for primary and permanent dentition. This anomalous true talon and semitalon, or tubercle-like, structure is composed of normal enamel and dentin and originating from the cervical third of the root. either has varying extensions of pulp tissue into it or is A talon cusp may present clinically as an isolated devoid of a pulp horn [Hattab and Hazza, 2001].
    [Show full text]
  • Dental Life Systems in Life Structures
    Dentistry Editorial Dental Life Systems in Life Structures Fardos N Rizk* Prosthodontic Department, British University in Egypt, Egypt INTRODUCTION lacquer epithelium. The development of cervical circle cells into the more profound tissues frames Hertwig's Epithelial Root Dental life systems are a field of life structures committed to the Sheath, which decides the root state of the tooth. The dental investigation of human tooth structures. The turn of events, papilla contains cells that form into odontoblasts, which are appearance, and grouping of teeth fall inside its domain. (The dentin-framing cells. Additionally, the intersection between the capacity of teeth as they reach each other falls somewhere else, dental papilla and internal polish epithelium decides the crown under dental impediment.) Tooth arrangement starts before state of a tooth. The dental follicle offers ascend to three birth, and the teeth's inevitable morphology is directed during significant substances: cementoblasts, osteoblasts, and this time. A dental life system is additionally a taxonomical fibroblasts. Cementoblasts structure the cementum of a tooth. science: it is worried about the naming of teeth and the designs Osteoblasts offer ascent to the alveolar bone around the of which they are made, this data filling a pragmatic need in foundations of teeth. Fibroblasts build up the periodontal dental treatment. Ordinarily, there are 20 essential ("infant") tendons which interface teeth to the alveolar bone through teeth and 32 perpetual teeth, the last four being third molars or cementum. Tooth advancement is ordinarily isolated into the "shrewdness teeth", every one of which might fill in. Among accompanying stages: the bud stage, the cap, the chime, lastly essential teeth, 10 ordinarily are found in the maxilla (upper jaw) development.
    [Show full text]
  • A Review of the Positive Influence of Crown Contours on Soft-Tissue Esthetics Richard P
    CLINICAL TECHNIQUE REVIEW CROWN RESTORATIONS A Review of the Positive Influence of Crown Contours on Soft-Tissue Esthetics Richard P. Kinsel, DDS; Bryan I. Pope, DMD, MSD; and Daniele Capoferri Abstract: Successful crown restorations duplicate the natural tooth in hue, chroma, value, maverick colors, and surface texture. Equally important is the visual harmony of the facial and proximal soft-tis- sue contours, which requires the collaborative skills of the restorative dentist, periodontist, and dental technician. The treatment team must understand the biologic structures adjacent to natural dentition and dental implants. This report describes the potential for specifically designed restorative contours to dictate the optimal gingival profile for tooth-supported and implant-supported crowns. Showing several cases, the article explains how esthetic soft-tissue contours enhance the definitive crown restoration, highlights the importance of clinical evaluation of adjacent biologic structures, and discusses keys to predicting when the proximal papilla has the potential to return to a favorable height and shape. sthetic crown restorations require precise control of the root interface relative to the convexity of the coronal enamel.3 multiple variables during crown fabrication in bio- Simulation of a natural tooth also depends on the location logic synergy with the surrounding soft-tissue pro- of the facial gingival zenith, defined as the most apical position file. This commendable goal frequently challenges of the free gingival margin. In healthy
    [Show full text]
  • Tooth-Forming Potential in Embryonic and Postnatal Tooth Bud Cells
    Med Mol Morphol (2008) 41:183–192 © The Japanese Society for Clinical Molecular Morphology 2008 DOI 10.1007/s00795-008-0416-9 REVIEW Masaki J. Honda · Hanson Fong · Shinji Iwatsuki Yoshinori Sumita · Mehmet Sarikaya Tooth-forming potential in embryonic and postnatal tooth bud cells Received: August 29, 2008 / Accepted: September 2, 2008 Abstract Humans are genetically programmed to replace Key words Biological teeth · Embryonic teeth · Postnatal their teeth once during childhood. Therefore, when adult teeth · Tissue engineering · Tooth bud cells · Tooth teeth are lost or damaged, they cannot be regenerated regeneration or regrown. However, with the advancement of stem cell biology and tissue engineering, regenerating the whole tooth has become a realistic and attractive option to replace a lost or damaged tooth, and therefore has strongly attracted Introduction attention in the fi eld of dental research. During the past several years, signifi cant progress has been made in this Teeth are the hardest tissues that develop in the jaw and research endeavor, providing greater understanding of the have several purposes including eating, pronunciation, production of an entire biological tooth by tissue engineer- defense, and esthetics. The loss of teeth because of caries, ing using stem cells. There are several ways to reproduce periodontal disease, or trauma is a relatively common an entire biological tooth. Approaches are categorized problem among older people. Because adult teeth are not according to the cell sources that have the potential to shed and do not regrow, several therapies such as artifi - produce teeth. One source is the embryonic tooth bud, and cial dentition, tooth transplantation, and dental implants the other is the postnatal tooth bud.
    [Show full text]
  • Odontoblast Differentiation
    Int. J. Dev. BioI. 39: 51-68 (1995) 51 Special Review Odontoblast differentiation JEAN VICTOR RUCH*, HERVE LESOT and CATHERINE BEGUE-KIRN Institut de 8iologie Medica/e, INSERM U 424, Strasbourg, France CONTENTS InIrod uction .......................................................................................................................... 52 From neural crest to the initial bell stage: the black box 52 Tooth patterning 52 Generation of tooth cell diversity 54 Cytological and functional aspects of odontoblast terminal differentiation .................. 54 Epigenesis of odontoblast terminal differentiation 57 The inner dental epithelium controls odontoblast terminal differentiation 57 The dental basement membrane plays a role in odontoblast differentiation 57 Dental basement membrane changes accompany odontoblast differentiation 58 A stage- and space-specific basement membrane is involved in odontoblast differentiation 59 Growth factors and odontoblast differentiation: descriptive data 59 Aspects of cell proliferation kinetics: the problem of competence 59 Fibronectin plays a role in odontoblast polarization 61 Effects of matrix molecules on odontoblast differentiation in vitro 62 Effects of TGFI31, BMP2 and IGFI on odontoblast differentiation 62 Current hypotheses and questions 62 Conclusion 65 Summary and key words ..................................................................................................... 65 References ........ 65 'Addre.. for reprints: Institut de Biologie Medicale, Faculte de Medecine, 11, rue Humann,
    [Show full text]
  • The Dilemma of the Open Gingival Embrasure Between Maxillary Central Incisors Orlando Motohiro Tanaka Pontifical Catholic University of Paraná
    Marquette University e-Publications@Marquette School of Dentistry Faculty Research and Dentistry, School of Publications 9-1-2008 The Dilemma of the Open Gingival Embrasure Between Maxillary Central Incisors Orlando Motohiro Tanaka Pontifical Catholic University of Paraná Bruno D'Aurea Furquim Pontifical Catholic University of Paraná Renata Correa Pascotto University of Maringá Gerson Luiz Ulema Ribeiro Federal University of Santa Catarina Jose A. Bosio Marquette University, [email protected] See next page for additional authors Published version. The Journal of Contemporary Dental Practice, Vol. 9, No. 6 (September 1, 2008): 92-98. Permalink. © 2008 Jaypee Journals. Used with permission. Authors Orlando Motohiro Tanaka, Bruno D'Aurea Furquim, Renata Correa Pascotto, Gerson Luiz Ulema Ribeiro, Jose A. Bosio, and Hirushi Maruo This article is available at e-Publications@Marquette: https://epublications.marquette.edu/dentistry_fac/130 The Dilemma of the Open Gingival Embrasure Between Maxillary Central Incisors Abstract Aim: The aim of this report is to present the etiology, diagnosis, and treatment planning strategy in the presence of an open gingival embrasure between the maxillary central incisors. Background: The open gingival embrasure or “black triangle” is a visible triangular space in the cervical region of the maxillary incisors. It appears when the gingival papilla does not completely fill in the interdental space. The space may occur due to: (1) disease or surgery with periodontal attachment loss resulting in gingival recession; (2) severely malaligned maxillary incisors; (3) divergent roots; or (4) triangular-shaped crowns associated with or without periodontal problems and alveolar bone resorptions. Report: The post-treatment prevalence in adult orthodontic patients is estimated to be around 40% compromising the esthetic result.
    [Show full text]