Biologic Width – Considering Periodontium in Restorative Dentistry

A satisfactory understanding of the relationship betweenperiodontal tissues and restorative dentistry is supreme tosafeguard satisfactory form, function, esthetics, and comfortof the teeth and its supporting structures. The tooth and itssupporting structures shall be considered as one biologic unit.Most of the dental surgeons are not aware of the importantrelationship, specific concepts such as biologic width, itsmaintenance and applications of crown lengthening in casesof biologic width violation. In the case of extensive caries,sub-gingival perforation and post and core placement inendodontic therapy, the concept of biologic width gains itsimportance. Biologic width is essential for the preservationof periodontium, which ultimately decides the success ofrestorative procedures. This article reviews the anatomy,categories, evaluation, violation, methods to correct theviolation of biologic width and its relationship to periodontalhealth and restorative dentistry.

Periointegración / Periointegration

Se busca entender cuáles son las respuestas biológicas que se dan en diferentes etapas de la implantología, centrando la atención en la influencia de la tecnología en la formación del ancho biológico. Se analiza cómo fue evolucionando la ciencia en la búsqueda de mejores respuestas y cuáles serán los factores decisivos para que la tecnología influencie a la biología y poder aproximarse cada vez más a lo natural.

The aim of this paper is to understand the biological responses at the different stages of implantology, with a focus on the influence of technology in the formation of the biological width. It presents a study of the evolution of science towards better responses and the determining factors for technology to influence biology, which allow us to get closer to what is natural.

Biologic width: Understanding and its preservation.

The relationship between the periodontal health and the restoration of teeth is intimate and inseparable. Maintenance of gingival health constitutes one of the keys for tooth and dental restoration longevity. An adequate understanding of relationship between the periodontal tissue and restorative dentistry is essential to ensure adequate form and function of dentition and Esthetics and comfort to the patients. Restoration of fractured (traumatized), severely decayed, partially erupted (delayed passive eruption), worn or poorly restorated teeth is often difficult for the dentist without surgical and orthodontic intervention. Surgical crown lengthening of these teeth is necessary to provide adequate tooth structure for restoration or Esthetics enhancement, thus adhering to basic biological principles by preventing impingement on the periodontal attachment apparatus or biological width. Many clinicians have been unable to utilize the concept of biologic width in practical manner. Hence the purpose of this article is to describe the biologic width anatomy, evaluations & correction of its violation by different methods.

Manejo del espacio biológico: revisión de literatura / Management of biological width: Literature review

Dentro de los diagnósticos de las patologías Periodontales, la clasificación número VIII según el último workshop de la Academia Americana de Periodoncia incluye a factores localizados y relacionados con un diente que predisponen a enfermedades gingivales inducidas por la biopelícula o la periodontitis; muchos de estos diagnósticos involucran directamente al espacio biológico. El espacio biológico es una zona variable, ya sea por la edad, el sexo, la pieza dentaria, la posición dentro de la arcada, etc. Sin embargo su función siempre es la misma, servir de soporte y de ser una zona fisiológicamente activa frente a la agresión bacteriana y mecánica. El presente artículo resume las múltiples fuentes de información de la literatura científica para abordar al detalle los aspectos a considerar al momento de diagnosticar las alteraciones del espacio biológico así como los protocolos para el tratamiento que permita su restauración...

Within the diagnoses of periodontal diseases, the classification number VIII according to the last workshop of the American Academy of Periodontology includes tooth localized factors and related that predisposing plaque-induced gingival diseases or Periodontitis, many of these diagnoses involve directly the biological width. Biological width is a variable area, either due to age, sex, the tooth, the position within the arcade, etc. However, its function is always the same, provide support and be a physiologically active zone against bacterial aggression and mechanics. This article summarizes the multiple sources of information in the scientific literature to address in detail the aspects to consider when diagnosing disorders of the biological width and the protocols for the treatment to its restoration or alteration...

An esthetic appliance for the management of crown-root fracture: a case report

Orthodontic extrusion is usually performed by means of a fixed orthodontic appliance that utilizes arch wire attached to adjacent teeth and transfers the desired force by elastic from the wire to the root. However, clinicians often encounter cases where the bonding required for tooth traction is not possible because the adjacent teeth have been restored with ceramic or veneer. The purpose of this case report is to describe a modified orthodontic extrusion appliance that is useful when conventional orthodontic treatment is not possible. The modified appliance was fabricated using an artificial tooth, clear plastic sheeting, and a braided fiber-reinforced composite strip that covered adjacent teeth without bonding. It satisfied the esthetic and functional needs of the patient and established the optimal biologic width.

Tratamiento periodontal quirúrgico en rehabilitación oral estética: reporte de caso clínico / Periodontal surgical treatment in aesthetic oral rehabilitation: a clinical case report

La rehabilitación de dientes que presentan grandes desgastes por atrición, erosión o abfracción tiene como objetivo devolver la función y la estética comprometida. En muchos casos es necesario realizar tratamientos periodontales quirúrgicos previos para respetar el espacio biológico y así rehabilitar, posteriormente, en perfecta armonía los dientes afectados. Este reporte muestra la técnica y recuperación de un caso con desgastes severos en los dientes anteroinferiores, el cual se tuvo que someter a un tratamiento periodontal quirúrgico mediante osteotomía para recuperar la dimensión vertical perdida a través de restauraciones provisorias...

Teeth rehabilitation that present great scuffs by attrition, erosion or abfraction, has as a main purpose to restore the function and aesthetic compromised. In some cases previous surgical periodontal treatments is required to respect the biological width and subsequently, the rehabilitation in perfect harmony of affected teeth. The present report has the objective to show the technique and recovering of a case with severe scuffs in lower anterior teeth, which was subjected to a surgical periodontal treatment by osteotomy to restore lost vertical dimension through temporary restorations...

Effects of implant collar design on marginal bone and soft tissue / 대한치과보철학회지

PURPOSE: The purpose of this study was to investigate the effects of implant collar design on marginal bone change and soft tissue response by an animal test MATERIALS AND METHODS: Two types of Implant (Neobiotech Co. Seoul, Korea) that only differs in collar design were planted on two healthy Beagle dogs. The implants were divided into two groups, the first group with a beveled collar (Bevel Group) and the second group with "S" shaped collar (Bioseal group). Standardized intraoral radiographs were used to investigate the mesio-distal change of the marginal bone. Histological analysis was done to evaluate the bucco-lingual marginal bone resorption and the soft tissue response adjacent to the implant. Mann-Whitney test was done to compare the mesio-distal marginal bone change at equivalent time for taking the radiographs and the tissue measurements between the groups. RESULTS: Radiographic and histological analysis showed that there was no difference in marginal bone change between the two groups (P>.05). Histological analysis showed Bioseal group had more rigid connective tissue attachment than the Bevel group. There was no difference in biological width (P>.05). Bevel group showed significantly longer junctional epithelium attachment and Bioseal group showed longer connective tissue attachment (P<.05). CONCLUSION: For three months there were no differences in marginal bone change between the Bevel group and the Bioseal group. As for the soft tissue adjacent to the implant, Bioseal group showed longer connective tissue attachment while showing shorter junctional epithelium attachment. There were no differences in biologic width.

An interdisciplinary approach to reconstruct a fractured tooth under an intact all ceramic crown: Case report with four years follow up.

Trauma causing the fracture of a restored tooth with the extracoronal full coverage prosthesis remaining intact is a common occurrence in dental practice. Reconstruction of the damaged tooth foundation and recementation of the crown can pose quite a challenge for the restorative dentist. This case report describes an innovative interdisciplinary chairside technique for the recementation of an all-ceramic crown on a fractured maxillary central incisor. The course of care described is effective, affordable, and saves time in comparison with other treatment options for such clinical situations.

Multi Disciplinary Rehabilitation of a Patient With Altered Passive Eruption and Hypodontia-- Case Report.

Patients who clinically display excessive gingival and short teeth require a thorough diagnosis and treatment plan to provide a predictable aesthetic outcome. This article illustrates multi-disciplinary approach in the treatment of a patient with altered passive eruption.

Esthetical effects of crown lengthening surgery on teeth with subgingival defect / 中华医学美学美容杂志

Objective To observe the results of crown lengthening surgery on the teeth with subgingival defect.Methods Crown lengthening surgery was performed on 54 terior teeth,which were divided into two groups based on probing depth of pre-operation:group A (<3 mm) and group B (3-4 mm).All teeth were restored 8 weeks after operation and followed-up to 1 year.The parameters of plaque index (PLI),suleus bleeding index (SBI),maximal defect probing depth (PD) and mobility degree (MD) at different times were measured,respectively.Results PLI,BI and PD were significantly improved during the follow-up period (P<0.01).The success rates of both groups were 96.8% and 69.6%, respectively (P<0.01).No significant difference about MD in the group A one year after restoration (P>0.05),but a significant improvement in the group B (P<0.01).Conclusion Crown lengthening surgery is a good method on the teeth with subgingival defect,but one must select the right indication.

Treatment of crown-root fracture with a modified crown fragment reattachment technique / 대한치과보존학회지

The development of adhesive dentistry has allowed that the crown fragment reattachment can be another option in the treatment of crown fracture. However, additional crown lengthening procedure or extrusion of the tooth may be necessary in the treatment of crown root fracture because subgingival fracture line in close proximity to the alveolar bone leads to challenges for restorative procedure and the violation of the biologic width. This case report presents a modified crown fragment reattachment technique of crown root fracture with pulp exposure, which was done without additional crown lengthening procedures. After the endodontic treatment, the patient was treated using a post insertion and the fragment reattachment technique, which made it possible to preserve the space for the biologic width and maintain a dry surgical field for adequate adhesion through the modification of the fractured coronal fragment. Since a coronal fracture was occurred and reattached afterward, it was observed that the coronal fragment was well maintained without the additional loss of periodontal attachment through 2-year follow up.

The influence of collar design on peri-implant marginal bone tissue / 대한치과보철학회지

STATEMENT OF PROBLEM: Peri-implant marginal bone loss is an important factor that affects the success of implants in esthetics and function. Various efforts have been made to reduce this bone loss by improving implant design and surface texture. Previous studies have shown that early marginal bone loss is affected by implant neck designs. PURPOSE: The purpose of this study was to examine the influence of laser microtexturing of implant collar on peri-implant marginal bone loss. MATERIALS AND METHODS: Radiographical marginal bone loss was examined in patients treated with implant-supported fixed partial dentures. Marginal bone level was examined with 101 implant fixtures installed in 53 patients at three periods(at the time of implantation, prosthetic treatment and 6-month after loading). Four types of implants were examined. The differences of bone loss between implants(ITI standard) with enough biologic width and implants(ITI esthetic plus, Silhouette IC, Silhouette IC Laser-Lok(TM)) with insufficient biologic width have been compared. Resorption angles were examined at the time of prosthetic delivery and 6-month after loading. RESULTS AND CONCLUSION: Within the limitation of this study, the following results were drawn. 1. The marginal bone loss of ITI standard and Silhouette IC Laser-Lok(TM) was less than that of ITI esthetic plus and Silhouette IC(P0.05). There was no significant statistical difference between marginal bone loss of ITI esthetic plus and Silhouette IC(P>0.05). 2. There was no significant difference in marginal bone loss between maxilla and mandible(P>0.05). 3. There was no significant difference in resorption angle among four types of implants(P>0.05). The marginal bone of implants with supracrestal collar design of less than that of biologic width had resorbed more than those with sufficient collar length. The roughness and laser microtexturing of implant neck seem to affect these results. If an implant with collar length of biologic width, exposure of fixture is a possible complication especially in the anterior regions of dentition that demand high esthetics. Short smooth neck implant are often recommended in these areas which may lack the distance between microgap and the marginal bone level. In these cases, the preservation of marginal bone must be put into consideration. From the result of this study, it may be concluded that laser microtexturing of implant neck is helpful in the preservation of marginal bone.