This document discusses biological width, which refers to the combined width of connective tissue and epithelial attachment adjacent to a tooth above the alveolar bone crest. The biological width was found to be approximately 2.04mm on average. Maintaining the biological width is important for periodontal health. There are several factors that can impact the biological width, such as the location and finish of restorative margins, gingival displacement techniques, crown contours, and subgingival debris. Violations of the biological width can be evaluated clinically and radiographically. Various techniques exist to correct biological width violations, including surgical crown lengthening procedures and orthodontic extrusion methods.
Furcation involvement is a common sequela of severe chronic periodontal disease. Its effective management has a profound influence on the outcome of periodontal therapy.
Biologic width - Importance in Periodontal and Restorative DentistryDr.Shraddha Kode
Biologic width plays a vital role for preservation of the periodontal health. This concept involves the dimensions of the epithelial and connective tissue attachment between the base of the sulcus and the alveolar crest which if involved can lead to gingival inflammation and gingival recession.
Furcation involvement is a common sequela of severe chronic periodontal disease. Its effective management has a profound influence on the outcome of periodontal therapy.
Biologic width - Importance in Periodontal and Restorative DentistryDr.Shraddha Kode
Biologic width plays a vital role for preservation of the periodontal health. This concept involves the dimensions of the epithelial and connective tissue attachment between the base of the sulcus and the alveolar crest which if involved can lead to gingival inflammation and gingival recession.
The primary success metric of dental implants is achieving osseointegration, which is influenced by many factors including implant design, surface treatments, as well as treatment method. Implant drilling is also a major influential factor.
The biological fixation determines the longevity of dental implant treatment. It ensures the long term survival of dental implant. Better the osseointegration,higher will be the survival rate
Soft tissue considerations for implant placementGanesh Nair
pre and post soft tissue considerations prior and post implant placement including various surgical technique for simple and advanced soft tissue augmentation
Failures in Fixed Partial Denture
(Prosthodontics FPD- Dental science)
Various types of failures in the fabrication of fixed partial denture
Dr.Sachin Sunny Otta
St.Gregorios Dental College,Kothamangalam,Ernakulam
Retention in fixed partial dentures / cosmetic dentistry courseIndian dental academy
Indian Dental Academy: will be one of the most relevant and exciting training center with best faculty and flexible training programs for dental professionals who wish to advance in their dental practice,Offers certified courses in Dental implants,Orthodontics,Endodontics,Cosmetic Dentistry, Prosthetic Dentistry, Periodontics and General Dentistry.
Periodontal plastic surgery is defined as the surgical procedures performed to correct deformities of the gingiva or alveolar mucosa. It includes widening of attached gingiva,
deepening of shallow vestibules, resection of the aberrant frena, depigmentation of gingiva.In all of these procedures, blood supply is the most significant concern and must be the underlying issue for all decisions regarding the individual surgical procedure.
The primary success metric of dental implants is achieving osseointegration, which is influenced by many factors including implant design, surface treatments, as well as treatment method. Implant drilling is also a major influential factor.
The biological fixation determines the longevity of dental implant treatment. It ensures the long term survival of dental implant. Better the osseointegration,higher will be the survival rate
Soft tissue considerations for implant placementGanesh Nair
pre and post soft tissue considerations prior and post implant placement including various surgical technique for simple and advanced soft tissue augmentation
Failures in Fixed Partial Denture
(Prosthodontics FPD- Dental science)
Various types of failures in the fabrication of fixed partial denture
Dr.Sachin Sunny Otta
St.Gregorios Dental College,Kothamangalam,Ernakulam
Retention in fixed partial dentures / cosmetic dentistry courseIndian dental academy
Indian Dental Academy: will be one of the most relevant and exciting training center with best faculty and flexible training programs for dental professionals who wish to advance in their dental practice,Offers certified courses in Dental implants,Orthodontics,Endodontics,Cosmetic Dentistry, Prosthetic Dentistry, Periodontics and General Dentistry.
Periodontal plastic surgery is defined as the surgical procedures performed to correct deformities of the gingiva or alveolar mucosa. It includes widening of attached gingiva,
deepening of shallow vestibules, resection of the aberrant frena, depigmentation of gingiva.In all of these procedures, blood supply is the most significant concern and must be the underlying issue for all decisions regarding the individual surgical procedure.
mucogingival surgery or plastic surgery of muco-gingival tissue is a surgical procedure targeted to correct and eliminate anatomic, developmental and traumatic alterations of gingiva.
Introduction
Teeth do not possess the regenerative ability found in most other tissues. Therefore, once the enamel or dentine is lost as a result of caries, trauma, or wear, restorative materials must be used to re-establish the form and function. Teeth require preparation to receive restorations and these preparations must be based on fundamental principles from which basic criteria can be developed to help predict the success of the prosthodontic treatment.
Definition
Objectives of tooth preparation
Principles of tooth preparation
Biological considerations
Mechanical considerations
Esthetic considerations
Conclusion
Each tooth preparation must be measured by clearly defined criteria that can be used to identify and correct problems. It is important to understand the pertinent theories underlying each step is crucial. Successful preparation can be obtained most easily by systematically following the steps which will ensure optimal quality of final restoration, which will serve the patient for a long time.
Indian Dental Academy: will be one of the most relevant and exciting training center with best faculty and flexible training programs for dental professionals who wish to advance in their dental practice,Offers certified courses in Dental implants,Orthodontics,Endodontics,Cosmetic Dentistry, Prosthetic Dentistry, Periodontics and General Dentistry.
The presentation shows the relation between the restorative dentistry and the periodontium , explaining the per-prothetic surgeries and the biological consideration including the biological width. Also, mention how to restore the open embrasures between teeth (the black triangle).
macroscopic/ clinical features of gingiva
With video clips
Short video descriptions
Lecture for 3rd BDS students
Periodontology
Periodontics aspect
Clinical features of the gingiva
Anti ulcer drugs and their Advance pharmacology ||
Anti-ulcer drugs are medications used to prevent and treat ulcers in the stomach and upper part of the small intestine (duodenal ulcers). These ulcers are often caused by an imbalance between stomach acid and the mucosal lining, which protects the stomach lining.
||Scope: Overview of various classes of anti-ulcer drugs, their mechanisms of action, indications, side effects, and clinical considerations.
These simplified slides by Dr. Sidra Arshad present an overview of the non-respiratory functions of the respiratory tract.
Learning objectives:
1. Enlist the non-respiratory functions of the respiratory tract
2. Briefly explain how these functions are carried out
3. Discuss the significance of dead space
4. Differentiate between minute ventilation and alveolar ventilation
5. Describe the cough and sneeze reflexes
Study Resources:
1. Chapter 39, Guyton and Hall Textbook of Medical Physiology, 14th edition
2. Chapter 34, Ganong’s Review of Medical Physiology, 26th edition
3. Chapter 17, Human Physiology by Lauralee Sherwood, 9th edition
4. Non-respiratory functions of the lungs https://academic.oup.com/bjaed/article/13/3/98/278874
ARTIFICIAL INTELLIGENCE IN HEALTHCARE.pdfAnujkumaranit
Artificial intelligence (AI) refers to the simulation of human intelligence processes by machines, especially computer systems. It encompasses tasks such as learning, reasoning, problem-solving, perception, and language understanding. AI technologies are revolutionizing various fields, from healthcare to finance, by enabling machines to perform tasks that typically require human intelligence.
TEST BANK for Operations Management, 14th Edition by William J. Stevenson, Ve...kevinkariuki227
TEST BANK for Operations Management, 14th Edition by William J. Stevenson, Verified Chapters 1 - 19, Complete Newest Version.pdf
TEST BANK for Operations Management, 14th Edition by William J. Stevenson, Verified Chapters 1 - 19, Complete Newest Version.pdf
These lecture slides, by Dr Sidra Arshad, offer a quick overview of physiological basis of a normal electrocardiogram.
Learning objectives:
1. Define an electrocardiogram (ECG) and electrocardiography
2. Describe how dipoles generated by the heart produce the waveforms of the ECG
3. Describe the components of a normal electrocardiogram of a typical bipolar leads (limb II)
4. Differentiate between intervals and segments
5. Enlist some common indications for obtaining an ECG
Study Resources:
1. Chapter 11, Guyton and Hall Textbook of Medical Physiology, 14th edition
2. Chapter 9, Human Physiology - From Cells to Systems, Lauralee Sherwood, 9th edition
3. Chapter 29, Ganong’s Review of Medical Physiology, 26th edition
4. Electrocardiogram, StatPearls - https://www.ncbi.nlm.nih.gov/books/NBK549803/
5. ECG in Medical Practice by ABM Abdullah, 4th edition
6. ECG Basics, http://www.nataliescasebook.com/tag/e-c-g-basics
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Lung Cancer: Artificial Intelligence, Synergetics, Complex System Analysis, S...Oleg Kshivets
RESULTS: Overall life span (LS) was 2252.1±1742.5 days and cumulative 5-year survival (5YS) reached 73.2%, 10 years – 64.8%, 20 years – 42.5%. 513 LCP lived more than 5 years (LS=3124.6±1525.6 days), 148 LCP – more than 10 years (LS=5054.4±1504.1 days).199 LCP died because of LC (LS=562.7±374.5 days). 5YS of LCP after bi/lobectomies was significantly superior in comparison with LCP after pneumonectomies (78.1% vs.63.7%, P=0.00001 by log-rank test). AT significantly improved 5YS (66.3% vs. 34.8%) (P=0.00000 by log-rank test) only for LCP with N1-2. Cox modeling displayed that 5YS of LCP significantly depended on: phase transition (PT) early-invasive LC in terms of synergetics, PT N0—N12, cell ratio factors (ratio between cancer cells- CC and blood cells subpopulations), G1-3, histology, glucose, AT, blood cell circuit, prothrombin index, heparin tolerance, recalcification time (P=0.000-0.038). Neural networks, genetic algorithm selection and bootstrap simulation revealed relationships between 5YS and PT early-invasive LC (rank=1), PT N0—N12 (rank=2), thrombocytes/CC (3), erythrocytes/CC (4), eosinophils/CC (5), healthy cells/CC (6), lymphocytes/CC (7), segmented neutrophils/CC (8), stick neutrophils/CC (9), monocytes/CC (10); leucocytes/CC (11). Correct prediction of 5YS was 100% by neural networks computing (area under ROC curve=1.0; error=0.0).
CONCLUSIONS: 5YS of LCP after radical procedures significantly depended on: 1) PT early-invasive cancer; 2) PT N0--N12; 3) cell ratio factors; 4) blood cell circuit; 5) biochemical factors; 6) hemostasis system; 7) AT; 8) LC characteristics; 9) LC cell dynamics; 10) surgery type: lobectomy/pneumonectomy; 11) anthropometric data. Optimal diagnosis and treatment strategies for LC are: 1) screening and early detection of LC; 2) availability of experienced thoracic surgeons because of complexity of radical procedures; 3) aggressive en block surgery and adequate lymph node dissection for completeness; 4) precise prediction; 5) adjuvant chemoimmunoradiotherapy for LCP with unfavorable prognosis.
The prostate is an exocrine gland of the male mammalian reproductive system
It is a walnut-sized gland that forms part of the male reproductive system and is located in front of the rectum and just below the urinary bladder
Function is to store and secrete a clear, slightly alkaline fluid that constitutes 10-30% of the volume of the seminal fluid that along with the spermatozoa, constitutes semen
A healthy human prostate measures (4cm-vertical, by 3cm-horizontal, 2cm ant-post ).
It surrounds the urethra just below the urinary bladder. It has anterior, median, posterior and two lateral lobes
It’s work is regulated by androgens which are responsible for male sex characteristics
Generalised disease of the prostate due to hormonal derangement which leads to non malignant enlargement of the gland (increase in the number of epithelial cells and stromal tissue)to cause compression of the urethra leading to symptoms (LUTS
Title: Sense of Taste
Presenter: Dr. Faiza, Assistant Professor of Physiology
Qualifications:
MBBS (Best Graduate, AIMC Lahore)
FCPS Physiology
ICMT, CHPE, DHPE (STMU)
MPH (GC University, Faisalabad)
MBA (Virtual University of Pakistan)
Learning Objectives:
Describe the structure and function of taste buds.
Describe the relationship between the taste threshold and taste index of common substances.
Explain the chemical basis and signal transduction of taste perception for each type of primary taste sensation.
Recognize different abnormalities of taste perception and their causes.
Key Topics:
Significance of Taste Sensation:
Differentiation between pleasant and harmful food
Influence on behavior
Selection of food based on metabolic needs
Receptors of Taste:
Taste buds on the tongue
Influence of sense of smell, texture of food, and pain stimulation (e.g., by pepper)
Primary and Secondary Taste Sensations:
Primary taste sensations: Sweet, Sour, Salty, Bitter, Umami
Chemical basis and signal transduction mechanisms for each taste
Taste Threshold and Index:
Taste threshold values for Sweet (sucrose), Salty (NaCl), Sour (HCl), and Bitter (Quinine)
Taste index relationship: Inversely proportional to taste threshold
Taste Blindness:
Inability to taste certain substances, particularly thiourea compounds
Example: Phenylthiocarbamide
Structure and Function of Taste Buds:
Composition: Epithelial cells, Sustentacular/Supporting cells, Taste cells, Basal cells
Features: Taste pores, Taste hairs/microvilli, and Taste nerve fibers
Location of Taste Buds:
Found in papillae of the tongue (Fungiform, Circumvallate, Foliate)
Also present on the palate, tonsillar pillars, epiglottis, and proximal esophagus
Mechanism of Taste Stimulation:
Interaction of taste substances with receptors on microvilli
Signal transduction pathways for Umami, Sweet, Bitter, Sour, and Salty tastes
Taste Sensitivity and Adaptation:
Decrease in sensitivity with age
Rapid adaptation of taste sensation
Role of Saliva in Taste:
Dissolution of tastants to reach receptors
Washing away the stimulus
Taste Preferences and Aversions:
Mechanisms behind taste preference and aversion
Influence of receptors and neural pathways
Impact of Sensory Nerve Damage:
Degeneration of taste buds if the sensory nerve fiber is cut
Abnormalities of Taste Detection:
Conditions: Ageusia, Hypogeusia, Dysgeusia (parageusia)
Causes: Nerve damage, neurological disorders, infections, poor oral hygiene, adverse drug effects, deficiencies, aging, tobacco use, altered neurotransmitter levels
Neurotransmitters and Taste Threshold:
Effects of serotonin (5-HT) and norepinephrine (NE) on taste sensitivity
Supertasters:
25% of the population with heightened sensitivity to taste, especially bitterness
Increased number of fungiform papillae
2. CONTENTS
Definition of biologic width
Importance
Categories
Significant factors related to biologic width
Evaluation of b. w. violation
Correction of b. w. violation
Ferrule effect
B. w. in implants
Conclusion
refrences
3. DEFINITION OF B.W.
• Biological width is defined as the combined width of connective
tissue and junctional epithelial attachment formed adjacent to a
tooth and superior to the crestal bone. (2.04mm in depth)
• the dimension of soft tissue which is attached to the portion of the
tooth coronal to the crest of alveolar bone. ( Gargiulo et al 1961)
• biological width was found to be 2.044 which represents:
1. a sulcus depth of 0.6mm ,
2. an epithelial attachment of 0.97mm
3. and connective tissue attachment of 1.07mm.
• Its dimensions are variable from tooth to tooth and also from one
surface to another.
4. IMPORTANCE
• Acts as a barrier and prevents penetration of microorganisms into
the periodontium.
• Maintenance of biologic width is essential to preserve the
periodontal health and to remove any irritation that may damage
the periodontium
5. CATEGORIES (3)
• categories of biological width based on
bone crest and the sulcus depth following
bone sounding measurements.
6. • Normal crest patients: The midfacial measurement is 3mm and the proximal measurement range from
3mm to 4.5mm . It occurs approximately 85% of the time. The gingival tissues tend to be stable in
patients.
• High crest patients: It occurs in approximately 2% of the time. There is one area where the crest is seen
more often, in a proximal surface adjacent to an edentulous site. In these patients, the mid- facial
measurement is less than 3mm.
• Low crest patients: It occurs approximately 13%of the time. The mid-facial measurement is greater than
3mm and the proximal measurement is greater than 4.5mm
7. SIGNIFICANT FACTORS ( HOW TO PRESERVE)
1-Restorative margin location
2-Margin nature
3-Displacement of gingival tissues
4-Crown contours and proximal contacts
5-Pontic design
6-Provisional restorations
7-Subgingival debris
8. HOW TO PRESERVE? (SIGNIFICANT FACTORS)
1-RESTORATIVE MARGIN LOCATION
• The location, fit and finish of restorative margins are critical factors in the maintenance of periodontal
health.
• So, a huge consideration and care should have performed during isolation and retraction (even with
digital impression techniques) besides tooth preparation to the biological width to ensure the
healthy standards and maintenance the normal values of the periodontium.
9. There are three options available for the placement of margins:
• supra gingival,
• equigingival
• and sub gingival.
10. 1. SUPRAGINGIVAL
It is better to place the finishing line supragingivally fore the
reasons:
1. Preparation of the tooth and finishing of the margin is easiest.
2.Easier duplication of the margins with impressions.
3. Fit and finish of the restoration and removal of excess material is easiest.
4. Verification of the marginal integrity of restoration is easiest.
5. The Supragingival margins are least irritating to the gingival tissues .
11. 2. EQUI-GINGIVAL MARGIN
It was thought that placement of equi-gingival
margins caused more plaque accumulation than
supragingival or sub gingival margin resulting in
gingival inflammation.
But today the restorative margins can be
esthetically blended with the tooth and finished to
provide a smooth,polished interface at the
gingival margin.
12. 3. SUBGINGIVAL MARGIN
subgingival restoration demonstrated more quantitative and qualitative changes in the micro flora, increased plaque index, gingival index, recession, pocket
depth and gingival fluid.
Indication:
Aesthetic areas
Subgingival caries
Dentinal hypersensitivity
Subgingival discoloration
Short clinical crown
13. GUIDE IN SUBGINGIVAL MARGIN PLACEMENT RELATED
TO SULCULAR DEPTH
• Finish line placement According to Ingber et al. 1977, at least 3mm space is required from
finish line to the crest of alveolar bone to adequate healing and definitive restoration on
tooth
• Rule 1: If probing depth for gingival sulcus is 1.5mm or less then finish line should be 0.5mm
below the gingiva
• Rule 2: If probing depth is more than 1.5mm then finish line is placed on half of its sulcus
depth.
• Rule 3: If more than 2mm, advised gingivectomy up to sulcus depth of 1.5mm then finish
line is placed according to rule 1.
14. WHICH BETTER?
• Most of the studies prove that supra-gingival margins are most congruent in
regard to periodontal health. Hence it should be positively considered in non
aesthetic zones.
• The equi-gingival finish line can be considered in aesthetic zones with care during
tooth preparation and appropriate maintenance.
• In unavoidable clinical conditions, subgingival finish line can be established but
without iatrogenic damage to periodontium and accurate treatment planning.
15. Despite of the
material, the
margin should be
smooth , rounded
with good finish
and polish
2-MARGIN NATURE
16. 3-DISPLACEMENT OF GINGIVAL TISSUES
(GINGIVAL RETRACTION)
Objectives of gingival retraction:
1. Create an access for the impression material to the area of the preparation that is located sub-
gingivally.
2. To provide enough thickness of the impression material at the area of the finishing line to prevent
distortion of the impression.
3. Providing the best possible condition for the impression material, fluid control.
4. Reduce fluid a mount in the sulcus that might cause void in the impression.
17. GINGIVAL RETRACTION TECHNIQUES:
1)) Mechanical.(plain Retraction
cord ,Retraction Crown, Copper
band or tube , Anatomic
compression caps, Matrices and
wedges, Rubber dam )
2) )) Chemo mechanical
(combination of mechanical and
chemical)
• a) )) Impregnated Retraction cord ,with
one of following; (« aluminum sulfate„«
epinephrine, « ferric sulfate, « zinc
chloride, « aluminum chloride )
• b) )) Displacement polymer & paste
(Cordless technique)
3) )) surgical ( Gingitage , Electro-
surgical, Laser).
18. DOUBLE (DUAL) CORD TECHNIQUE
• When 2 cords are need, it requires that about 1 mm of intact tooth structure remains between the
top of the initial cord and the preparation margin.
• First Cord is Thin, Remain during Impression while the Second Cord is thick. In this technique, a thin
cord is placed without overlap at the bottom of the gingival crevice.
• A second cord is placed on top to achieve lateral tissue displacement and removed immediately
before impression making, whereas the initial cord is left in place to help minimize seepage during
Impression,
• be careful not to exert excessive pressure on the tissues, which can damage the epithelial
attachment (Biological Width).
19.
20. 4-CROWN CONTOURS AND
PROXIMAL CONTACTS
Periodontal
health and
clinical
crown
contour are
interrelated.
Over-contouring of restoration has to be avoided in every case.
Gradual and smooth curvatures should be included in crown contour so as to facilitate the rubbing and
function of the lips, cheeks, and tongue.
Contour of interproximal area should be self cleansing and patient should be able to clean them comfortably.
Height of subgingival contour facio-lingually should not be more than ½ of the thickness of the gingiva. This
protects the gingival crevice and helps in maintaining knifelike free gingival margin, with plaque control
21. 5-PROVISIONAL RESTORATIONS
• Three critical areas must be effectively managed to produce a favorable
biologic response to provisional restorations during the interval until the final
restorations are delivered.
1. The marginal fit,
2. crown contour,
3. surface finish of the restorations
• Temporary restorations that are improperly adapted at the margins, that are
over or under contoured, and that have rough or porous surfaces can result in
inflammation, overgrowth, or recession of gingival tissues.
• The outcome can be unpredictable; and unfavorable changes in the tissue
structures can compromise the success of the final restoration.
22. 6-SUBGINGIVAL DEBRIS
• An adverse periodontal response can be created if debris is left below the tissues during
restorative procedures.
• The source can be retraction cord, impression material, provisional material, or either
temporary or permanent cement
• The diagnosis of debris as the cause of gingival inflammation can be confirmed by
examining the sulcus surrounding the restoration with an explorer, removing any foreign
bodies, and then monitoring the tissue response.
• It may be necessary to provide tissue anesthesia for patient comfort during the procedure.
23. 7-HYPERSENSITIVITY TO
DENTAL MATERIALS
• Inflammatory gingival responses have been reported related to the use of nonprecious alloys
in dental restorations
• Typically, the responses have occurred to alloys containing nickel, although the frequency of
these occurrences is controversial
• Hypersensitivity responses to precious are extremely rare, and these alloys provide an easy
solution to the problems encountered with the nonprecious alloys.
• In clinical research, porcelain ,highly polished gold, and highly polished resin all show similar
plaque accumulation.
• Regardless of the restorative material selected, a smooth surface is essential on all materials
subgingivally.
24. 8-CEMENTATION
• Excess cement in subgingival spaces can be described as
an “artificial calculus” and may have a similar irritating effect
as a calcified calculus on periodontally involved teeth and
hence affecting the biologic width.
25. EVALUATION OF BIOLOGIC WIDTH VIOLATION
1-Clinical sign and symptoms
3-Radiographic evaluation
2-Bone sounding
The biologic width has inter-personal and intra-personal variability.
26. 1. CLINICAL SIGNS AND SYMPTOMS OF BIOLOGIC WIDTH
VIOLATION
• The presence of discomfort during examination of restoration margins indicates
biologic width violation.
• The clinical signs and sequel of biologic width violation are:
1.Chronic progressive gingival inflammation around the restoration
2.Bleeding on probing
3.Localized gingival hyperplasia with minimal bone loss
4.Pocket formation
5.Gingival recession
6.Clinical attachment loss
7.Alveolar bone loss
• Invasion of restoration into biologic width initiates crestal bone resorption.
• This occurs to allow space for establishment of a minimum biologic width
27. 2-BONE SOUNDING
1. Measurements carried out with a calibrated periodontal probe.
2. Probe fitted tightly with a silicon rubber sliding 'stoper.’
3. Under local anesthesia the probe was placed in the corono-apical direction, held against the
tooth, and advanced apically so that the rubber stop would stay at the incisal edge with the probe
tip at the base of sulcus in parallel direction to the tooth axis.
4. This distance was assessed with Vernier calipers
5. The probe was then advanced further apically until osseous tissue (crestal bone)was felt, and this
distance was also recorded.
6. The difference of the two recorded measurements indicated the biological width
• If this distance is less than 2mm at one or more locations, a diagnosis of biological width violation
can be confirmed.
• This measurement must be performed on teeth with healthy gingiva and should be repeated on
more than one tooth to ensure accurate assessment and reduce individual and site variations.
28.
29. 3- RADIOGRAPHIC EVALUATION
Radiographs are useful non-invasive tools in the
assessment of biological width encroachment.
Parallel profile radiographic (PPR) technique has been
introduced to measure the dimensions.
This technique is limited for anterior region and only for
labial surface in healthy teeth.
30. The most apical point of the gingival sulcus was
assessed by probing [Figure 1].
To highlight the soft tissue structures on the radiograph, the auxiliary elements used were
gutta percha and lead foil because of their opaque nature. After probing, gutta percha was cut
to the sulcus depth [Figure 2, 3],
The lead foil was cut appropriately [Figure 4]
and then positioned over the gingival surface,
aligned with the long axis of the tooth.
The paralleling device was placed in such a way that
the film was positioned on the lateral vestibule
When the patient fixes teeth on the bite block fig 5
The radiographs thus obtained were digitized using
a scanner fig 6. The images were imported to
Adobe Photoshop CS2.
31. THE FOLLOWING MEASUREMENTS CAN BE OBTAINED:
1-Distance between the bottom of the gingival sulcus
(apical end of gutta percha) and the bone crest - thus,
the length of the DGU
2-Thickness of labial soft tissue measured from the
palatal face of the lead plate to the root surface - thus,
the width of the DGU
The limitation of this technique is that it cannot be used
in posterior teeth and unhealthy periodontal tissues.
32. METHOD TO CORRECT BIOLOGIC WIDTH VIOLATION
BY CROWN LENGTHENING EITHER SURGICALLY OR ORTHO:
• 1. Surgical crown lengthening:
1. Gingivectomy
2. APF with osseous reduction
3. Surgical extrusion
• 2. Orthodontic procedure
1. Forced eruption ( slow orthodontic extrusion)
2. Forced eruption combined with fiberotomy (rapid orthodontic extrusion)
33. 1-GINGIVECTOMY
• It is the Excision of the gingiva.
• The incision should be beveled at approximately 45 degrees to
the tooth surface, and it should re-create the normal festooned
pattern of the gingiva.
• Indications :
1. Elimination of suprabony pockets if the pocket
wall is fibrous and firm
2. Elimination of gingival enlargements
• Contraindications
1.Access to bone required
2.Narrow zone of keratinized tissue
3.Patients with high postoperative risk of bleeding
34. • Advantages: ease and simplicity of the procedure, but it has the
• Disadvantages of more postoperative discomfort and an increased chance
of postoperative bleeding. It also sacrifices keratinized tissue and does not
allow for osseous recontouring.
• Types (how to perform)
1.Surgical gingivectomy
2.Laser gingivectomy
3.Chemosurgery gingivectomy
4.Electrosurgical gingivectomy
35.
36.
37. 2-APF WITH OSSEOUS REDUCTION
It is the most common procedure for clinical crown lengthening.
It is done in inadequate zone of attached gingiva and biologic width
less than 3 mm.
Dis adv: Detailed evaluation should be done before carrying out
osseous reduction as it compromises periodontal support of the
tooth, causes furcation involvement, poor crown-to root ratio and
gingival recession.
It should not be done during surgical crown lengthening of a single
tooth in the esthetic zone. In such cases, forced eruption should be
considered to prevent negative architecture.
38.
39.
40.
41.
42. 3-SURGICAL EXTRUSION
Fig. Surgical extrusion of tooth 1.2 with insufficient ferrule effect (a,b). Tooth was extracted
with an atraumatic method (c) and then reimplanted and splinted, waiting for healing (d–f).
Fig. Prosthetic rehabilitation.
43. ORTHODONTIC PROCEDURES:
1-FORCED ERUPTION (SLOW ORTHODONTIC
EXTRUSION)
• In forced eruption, tooth is intentionally moved in a
coronal direction using gentle continuous force.
• The force stretches gingival and periodontal fibers
resulting in a coronal shift of gingiva and bone.
• Orthodontic extrusion requires an activation period of 4-6
weeks and 6-8 weeks retention period for tooth to become
stabilized in its new position.
• Additional surgical crown lengthening may be required
after forced eruption.
• The contraindications are inadequate crown-to-root ratio,
lack of occlusal clearance and periodontal complications.
44.
45. 2-FORCED ERUPTION WITH FIBEROTOMY (RAPID
ORTHO EXTRUSION)
• Combination of orthodontic extrusion and severance of supra-crestal fibers,
termed supra-crestal fiberotomy is also used for crown lengthening.
• If fibrotomy is performed during the forced tooth eruption procedure, the crestal
bone, and the gingival margin are retrieved at their pretreatment location. Thus,
the tooth-gingiva interface at adjacent teeth is unaltered.
• Fibrotomy is performed once every 7-10 days during the phase of forced tooth
eruption
46.
47. FERRULE EFFECT:
• A ferrule effect is defined as a ‘‘360 metal collar of the
crown surrounding the parallel walls of the dentine
extending coronal to the shoulder of the preparation. The
result is an elevation in resistance form of the crown from
the extension of dentinal tooth structure
• More precisely, parallel walls of dentin extending coronally
from the crown margin provide a ‘‘ferrule,’’ which after
being encircled by a crown provides a protective effect by
reducing stresses within a tooth called the ‘‘ferrule effect’’
• The presence of a 1.5- to 2-mm ferrule has a positive effect
on fracture resistance of endodontically treated teeth.
• If the clinical situation does not permit a circumferential
ferrule, an incomplete ferrule is considered a better option
than a complete lack of ferrule
52. CONCLUSION
the study of the periodontal-prosthodontic relationship is necessary for the ultimate success of the prostheses
In dentistry the area of biological width along with sulcus, around natural teeth or an implant is sometimes called Bermuda Triangle or
Devil’s Triangle.
Like the Bermuda triangle, this biological width area is the most violated and misused area in dentistry, by almost all the dentists
irrespective of their specialty.
Hence, this region should be evaluated prior to treatment planning of the restorative phase.
The maintenance of the normal structure of the biological tissues should be done and the concept of biologic width must be
followed at each procedure .
The periodontal health is an important key for the longevity of dental prostheses.
53. REFERENCES
1. Divya Khanna and Nikita Dhingra. “Biological Width-A Dilemma”. EC Dental Science 19.9 (2020): 67-69.
2. Galgali Sushama R, Gontiya Gauri. Evaluation of an innovative radiographic technique - parallel profile radiography - to
determine the dimensions of dentogingival unit. Year : 2011 | Volume: 22 | Issue Number: 2 | Page: 237-241
3. Preetha Selvan, Biologic Width and Its Importance in Dentistry, JMSCR Volume 2 Issue 5 May 2014
4. Cordaro, M.; Staderini, E.;Torsello, F.; Grande, N.M.; Turchi, M.;Cordaro, M. Orthodontic Extrusion vs. Surgical Extrusion to
Rehabilitate Severely Damaged Teeth: A Literature Review. Int. J. Environ. Res. Public Health 2021, 18, 9530. https://
doi.org/10.3390/ijerph18189530
5. Nikita Ambegaokar et al. Biologic width violation – A wake up call literature review, International Journal of Current Research,
Vol. 10, Issue, 03, pp.67212-67216, 2018
6. Rajendran, Maheaswari et al. “Biologic Width - Critical Zone for a Healthy Restoration.” IOSR Journal of Dental and Medical
Sciences 13 (2014): 93-98.
7. Sirajuddin, Syed, et al. "Suppl 1: M11: Iatrogenic Damage to Periodontium by Restorative Treatment Procedures: An
Overview." The Open Dentistry Journal 9 (2015): 217.
Editor's Notes
Dgu dento gingival unit
External bevel gingivectomy is both successful and predictable surgical procedure and is indicated in hyperplasia or pseudo-pocket along with presence of adequate amount of keratinized tissue.
Internal bevel gingivectomy is carried out if reduction of excessive pocket depth and exposure of coronal tooth is required in absence of sufficient zone of attached gingiva
The peri implant b w is composed of sulcus, supra-crestal epith., and connective tissue component