System Requirements Document

1. Introduction

This document defines the requirements for a system that converts the uploaded prosthodontics lecture — الوصلات الرئيسية (الكبرى) في الفك السفلي / Mandibular Major Connectors — into a presentation slide deck of no fewer than 25 slides.

The governing constraint from the request is strict source fidelity: the generated deck must present only the material contained in the uploaded lecture, and must not add any content from the system's own knowledge. Every section, sub-section, definition, characteristic, list, indication, advantage, disadvantage, measurement value, and labeled figure callout of the source must appear as slide content, and nothing more.

The source material is an academic dental lecture covering the anatomy-aware clinical examination, diagnostic imaging, structural framework, and — in detail — the mandibular major connectors of the removable partial denture, including their types, shapes, dimensions, indications, and the step-by-step design sequence on the cast.

2. System Overview

The system ingests the uploaded lecture PDF (Arabic text with embedded diagrams and clinical photographs), extracts its ordered structure, and composes a slide deck that mirrors the lecture's own organization.

The system is a document-to-slide conversion pipeline with four behaviors:

1. Ingestion — read the Arabic lecture text and embedded figures from the source PDF.
2. Structuring — segment the lecture into its headings, sub-headings, bullet lists, definitions, tables of measurements, and figures, preserving source order.
3. Composition — lay each segment onto slides (Arabic right-to-left text, with English technical terms preserved as written in the source), carrying figures through with their callouts intact.
4. Output — emit a presentation deck of at least 25 slides that is a faithful reproduction of the lecture.

The system performs no editorializing: it does not summarize away detail, reorder the lecture, or introduce any topic, image, statistic, or example that is not present in the source.

3. Functional Requirements

3.1 Conversion Controls

• As a lecturer, I want the system to ingest the uploaded lecture PDF (الوصلات الرئيسية الكبرى في الفك السفلي — Mandibular Major Connectors) so that its content can be converted into slides.
• As a lecturer, I want the generated deck to contain no fewer than 25 slides.
• As a lecturer, I want the system to reproduce only content present in the source lecture and to add nothing of its own, so that the deck remains a faithful representation of the lecture.
• As a lecturer, I want the deck to preserve the lecture's own order and structure of headings and sub-headings.
• As a lecturer, I want all measurement values in the lecture reproduced exactly as written (e.g., 6 mm, 3–4 mm, 8 mm, 5 mm, 1.5–2 mm, 3 mm, 4 mm, 6 mm, 0.2 mm, 2 mm).
• As a lecturer, I want embedded diagrams and clinical photographs carried into the deck with their labels and callouts intact.
• As a lecturer, I want Arabic technical terms kept alongside their English equivalents exactly as the lecture presents them (e.g., القوس اللساني / Lingual Bar).

3.2 Introductory and Diagnostic Content Slides

• As a dental student, I want a slide stating that obtaining successful, patient-appropriate prostheses is the ultimate goal of prosthetic treatment, and that the dentist must be familiar with all anatomical landmarks of both the upper and lower jaws.
• As a dental student, I want a slide stating that each patient must be assessed as an individual, unique case, because masticatory efficiency, oral care, psychological state, and acceptance of a foreign body in the mouth differ between patients.
• As a dental student, I want a slide listing the required careful clinical examination: detection of dental caries and their locations, assessment of tooth mobility and tilting, elongation of teeth, examination of the occlusal plane, and inspection of the gingiva and supporting tissues.
• As a dental student, I want a slide covering the clinical examination of residual alveolar ridge heights and remaining alveolar bone, and the length of the saddle region.
• As a dental student, I want a slide stating that after the meticulous clinical examination, a radiographic examination must be carried out to determine the locations and spread of dental caries, periapical lesions around tooth roots, and whether impacted teeth are present.
• As a dental student, I want a slide covering the practical fabrication steps of the removable partial denture: it must be designed so it can be inserted and removed without applying pressure to or injuring the tissues, and must replace all lost vital functions of natural teeth such as mastication and speech.
• As a dental student, I want a slide stating the denture must give the tongue freedom of movement, restore the esthetics lost with tooth loss, and correct the occlusion so that occlusal forces are distributed evenly over all teeth.

3.3 Structural Framework Slides

• As a dental student, I want a slide stating that the removable partial denture consists of four structural parts, each with a different functional task: the saddle (السرج), the major connector (الوصلة الرئيسية), retention elements (direct and indirect retainers), and support elements (rests/المهاميز).
• As a dental student, I want a slide stating that the saddle rests on the edentulous parts of the jaw and carries the artificial teeth, must adapt precisely to the residual ridge to avoid pressure points, and that high accuracy of adaptation also prevents saddle movement relative to the jaw.
• As a dental student, I want a slide presenting the three sections of the saddle: the denture base (قاعدة الجهاز), the denture body (جسم الجهاز), and the artificial teeth (الأسنان الاصطناعية).
• As a dental student, I want a slide on the denture base: it has direct contact with the mucosa, is designed to cover a wide area, and is defined according to the adjacent movable mucosal areas in contact with it.
• As a dental student, I want a slide on the denture body: it substitutes for the resorbed residual ridge, carries the artificial teeth, provides lip and cheek support, and its basic principle is to reproduce the previous anatomical shape — especially in dimensions — before tooth loss.
• As a dental student, I want a slide on the artificial teeth: they replace the natural teeth, restore the occlusion and thereby restore the function of mastication, and must therefore be given an anatomically and functionally correct shape while enhancing esthetics.
• As a dental student, I want a slide stating that the framework (major connector) is the mechanical connection between the appliance saddles, retention elements, and support elements, and can be fabricated from metal or acrylic.
• As a dental student, I want a slide stating that acrylic major connectors are usually built as a full or partial plate, that the plate edge must adapt closely to the remaining teeth, and that acrylic-connector appliances are used only for temporary appliances, are largely avoided for partial dentures, and are replaced by metal frameworks.

3.4 Component and Definition Slides

• As a dental student, I want a slide listing the basic components of the removable partial denture: (1) Major Connectors, (2) Minor Connectors, (3) Direct Retainers, (4) Indirect Retainers, (5) Rests (المهاميز), (6) Denture Base, (7) Replaced Acrylic Teeth.
• As a dental student, I want a slide giving the definition of major connectors: rigid elements of the removable partial denture that join the components on one side of the arch to those on the opposite side ("the part of a removable partial denture that joins the components on one side of the arch to those on the opposite side").
• As a dental student, I want a slide stating that all components of the appliance are directly or indirectly attached to the major connector, which resembles the framework of a building.

3.5 Major Connector Characteristics Slides

• As a dental student, I want a slide stating characteristic (A): the major connector must be rigid, because the appliance components cannot perform their roles unless the connector is rigid, and rigidity helps distribute masticatory forces to the supporting and bearing tissues and to the supports.
• As a dental student, I want a slide explaining that flexibility of the major connector and any torsion would allow occlusal forces and stresses to negatively affect the supports and the residual ridge, causing harm to the supporting tissues around the tooth, resorption of alveolar bone, and displacement or rocking of the appliance — hence the major connector stabilizes the appliance by resisting these forces.
• As a dental student, I want a slide stating characteristic (B): in the maxillary arch the major connector borders must be no less than 6 mm from the gingival margin, while in the mandibular arch they must be about 3–4 mm from the free gingival margins.
• As a dental student, I want a slide stating characteristic (C): the major connector borders must be parallel to the free gingival margin and must not pass over the gingival margin, because that would irritate and traumatize the supporting tooth tissues and cause inflammation; a space — the relief (الريليف الوقائي) — is therefore left between the soft tissues and the metal of the connector to avoid such complications.
• As a dental student, I want a slide explaining that otherwise the connector would later require grinding to prevent impingement, which weakens the major connector and its rigidity, risking fracture and appliance failure.
• As a dental student, I want a slide stating characteristic (D): the major connector must be comfortable and cause no irritation to the patient.
• As a dental student, I want a slide stating that the lingual bar (major connector) is placed at least 4 mm from the gingival margins where possible, and that the final vertical distance of the lingual bar must be at least 4 mm to ensure strength and rigidity.
• As a dental student, I want a slide stating that if the distance between the free gingival margins and the movable floor-of-mouth tissues is less than 8 mm, the lingual plate, the sublingual bar, or the continuous cingulum bar should be used instead.
• As a dental student, I want a slide stating that the lower border of the mandibular major connector must be rounded slightly in a cylindrical manner to eliminate the sharp edge.
• As a dental student, I want a slide stating that all borders of the major connector must be rounded, sharp angles avoided, and that it is best for the major connector to cross the midline of the palatal vault of the maxilla perpendicular to it and not obliquely.
• As a dental student, I want a slide stating that major connectors take many forms differing by location (maxillary or mandibular) — palatal or lingual arches, or labial arches, and palatal or lingual plates — and that each connector's form differs from another according to the arch and the indication, since each connector has a different indication.

3.6 Mandibular Major Connector Type Slides

• As a dental student, I want a slide listing the types of mandibular major connectors: (1) Lingual Bar — القوس اللساني, (2) Sublingual Bar — القوس تحت اللساني, (3) Continuous Cingulum Bar — سلك الاستناد المستمر, (4) Lingual Plate — الصفيحة اللسانية, (5) Labial Bar — القوس الشفوي.
• As a dental student, I want a slide presenting the diagram of the shapes of the major connectors in the mandible (labeled A–E).

3.7 Lingual Bar Slides

• As a dental student, I want a slide stating that the lingual bar is the most common and most used form in the mandible because of the ease and simplicity of its design, its possession of the minimum required contact with the soft and oral tissues around it, that it does not touch the teeth, and that it accumulates less food debris and plaque beneath it, while meeting most of the required conditions.
• As a dental student, I want a slide on the shape of the lingual bar: it is half-pear shaped, straight at the back, with the wider part of the arch placed in the lower part closest to the floor of the mouth.
• As a dental student, I want a slide on the dimensions of the lingual bar: about 5 mm wide and approximately 1.5–2 mm thick, positioned about 3 mm from the gingival papillae — meaning the distance between the gingival margins and the upper borders of the bar is not less than 3 mm, and preferably more.
• As a dental student, I want a slide stating that a relief (space) must be left between the lingual bar and the soft gingival tissue beneath it, to allow food debris to slip past.
• As a dental student, I want a slide explaining that if this relief is not left, and due to resorption of the alveolar bone, the metal of the bar may eventually have to be ground at the place contacting the tissue beneath it, increasing the thinness of the metal; the bar then loses its rigidity and causes appliance failure — so rigidity is the key characteristic the lingual bar must possess, since it will resist the many different occlusal forces and stresses the appliance receives.
• As a dental student, I want a slide stating that the bar must not be overly increased in bulk and thickness, because it may impede tongue movement during speech and mastication.
• As a dental student, I want a slide presenting the labeled component diagram of the lingual bar assembly: (1) the lingual bar, (2a) a minor connector connected with an acrylic base, (2b) a minor connector, (2c) a minor connector linking the rests to the major connector, (3) occlusal rests, (4) the retentive clasp arm, (5) the reciprocal arm, and (6) the indirect retainer (minor connector and occlusal rest).
• As a dental student, I want a slide stating that the lingual bar should have rounded edges so it causes no irritation to the tongue or the oral tissues in contact with it.
• As a dental student, I want a slide stating there must be a space between the upper edge of the bar and the gingival papillae above, and that the lower edge of the mandibular major connector should be positioned as far down as possible to avoid collision with the tongue — but without injuring the movable oral tissues of the floor of the mouth or colliding with them during speaking, mastication, swallowing, and other vital functions.
• As a dental student, I want a slide on the indications of the lingual bar: it is indicated in all classes of partial edentulism in the mandible except one case — the distance between the movable floor-of-mouth soft tissues and the free gingival margins must be at least 8 mm; if it is less than that, the lingual bar cannot be used and the lingual plate is used instead.

3.8 Lingual Plate Slides

• As a dental student, I want a slide on the shape and components of the lingual plate: it consists of a half-pear-shaped lingual bar placed in the floor of the mouth without impeding its functional movements, plus a metal piece covering the lingual surfaces of the lower anterior teeth, ending at its two ends with the minor connector at whose end the rest sits, and the lingual bar forming the lower border of the plate must retain its half-pear shape and be rigid.
• As a dental student, I want a slide stating that the lingual plate must not be used without placing at least two rests, one at each end of the dental arch, and that these rests support the plate by acting as indirect retainers — especially when indirect retention is required, as in Kennedy Class I and Class II — because the lingual plate alone cannot act as an indirect retainer.
• As a dental student, I want a slide stating that the upper edges of the plate should be located above the middle third of the lingual surfaces of the lower anterior teeth, with upper edges following the lingual surfaces of these teeth, while the lower edges of the plate should be positioned as low as possible toward the floor of the mouth without conflicting with the functional movement of the tongue and soft tissues.
• As a dental student, I want a slide stating that the lingual plate may be used with the metal pieces placed directly behind the anterior teeth and not between them, when there are spaces between the anterior teeth, so as to reduce the appearance of the plate metal as much as possible and thereby improve the patient's esthetics.
• As a dental student, I want a slide on the advantages of the lingual plate: it is very comfortable for the patient, can be removed daily from the mouth to clean the appliance — preventing accumulation of plaque and food debris around the tooth necks — though lack of good oral hygiene can lead to ulceration and irritation of the adjacent soft tissues; it has the greatest rigidity, can provide indirect retention for the appliance, and acts to stabilize the lower anterior teeth.
• As a dental student, I want a slide on the disadvantages of the lingual plate: the first is its excessive coverage of the natural teeth, which may negatively affect the surface enamel layer of the teeth; the second is that it needs extra oral care, and a relief must be made between the gingival margin and the plate metal so the plate does not press on the gingival tissues and damage them.
• As a dental student, I want a slide on indication (a) of the lingual plate: it is indicated in cases where the lower anterior teeth have compromised supporting tissues — i.e., are mobile (unstable) — where the plate acts like a splint, though it is not as effective as one.
• As a dental student, I want a slide on indication (b) of the lingual plate: it is used when there is not enough space for the lingual bar — when the distance between the movable floor-of-mouth soft tissues and the free gingival margins is less than 8 mm, for example when the lingual frenum is high, in which case the lingual bar would have to be placed close to the gingival tissues, causing scratching and ulceration.
• As a dental student, I want a slide describing how the distance between the floor of the mouth and the free gingival margins of the teeth is measured: using the tissue caliper (مسبر الأنسجة الداعمة السنية), with the patient asked to place the tip of the tongue touching the upper lip; the measurement is recorded and transferred to the final cast to confirm the correct position of the lower border of the major connector.
• As a dental student, I want a slide on indication (c) of the lingual plate: it is used for people who have bony exostoses on the lingual side that are difficult to remove surgically, since the lingual bar in such cases impedes the functional movements of the tongue and may cause rocking and dislodgement of the appliance; the lingual plate is therefore used with a relief made in the metal framework in the torus area.
• As a dental student, I want a slide stating that the lingual plate prevents accumulation of plaque on the necks of the lower anterior teeth by being removed daily for cleaning, keeping the soft tissues intact, and that the continuous cingulum bar can also be used in these cases but is less comfortable for the patient than the plate.

3.9 Sublingual Bar Slides

• As a dental student, I want a slide on the sublingual bar: when the measured distance to the floor of the mouth does not allow the lingual bar to be placed at its specified position, an alternative placed 4 mm below the free gingival margin is the sublingual bar.
• As a dental student, I want a slide stating that the sublingual bar keeps essentially the same shape as the lingual bar itself but is placed lower and behind the usual position of the lingual bar above the floor of the mouth, parallel to its anterior portion.
• As a dental student, I want a slide stating it is acceptable to use the sublingual bar instead of the lingual plate if the lingual frenum is tethered, or in the case of an anterior lingual prominence requiring removal of a large part of the conventional lingual bar.
• As a dental student, I want a slide stating that the end of the sublingual bar is fixed on the slope of the residual ridge, must be placed away from the gingiva and the tongue, and must work so that it is stable and resistant to bending and torsion while also being thin enough to ensure the patient can wear it without discomfort.
• As a dental student, I want a slide stating that the sublingual bar is placed as deep as possible and that a safety distance of 4 mm is left from the free gingival margins to the bar in the anterior region, and 6 mm in the posterior region.
• As a dental student, I want a slide stating that if the posterior residual ridge area is sloped lingually or the posterior teeth are markedly tilted, the horizontal distance may be increased to 2 mm.
• As a dental student, I want a slide explaining that if free-end saddles receive masticatory forces, the sublingual bar is pressed forward onto the residual ridge, so freedom of movement is necessary to avoid loading the vertical surface of the residual ridge.
• As a dental student, I want a slide stating that in the anterior region the bar must sit at a horizontal distance of 0.2 mm from the residual ridge, so it should not touch the mucosa.
• As a dental student, I want a slide stating that the sublingual bar is rounded and must be kept at least 0.2 mm away from the residual ridge; if the ridge is straight and not sloped the bar can be removed without interference, whereas if the ridge slopes lingually the horizontal distance increases, so the bar may be switched from the lingual side to the buccal side — and if the ridge slope is severe, it becomes the labial bar.

3.10 Cingulum Bar Slides

• As a dental student, I want a slide on the continuous cingulum bar: it is used alone or together with a lingual bar beneath it.
• As a dental student, I want a slide stating that the cingulum bar is indicated when the lower anterior teeth are slightly tilted, but that it is uncomfortable for the patient and causes many irritations; it is placed on the lingual surfaces of the lower anterior teeth, and because of the short distance between the bar and the teeth, food debris can slip down and plaque can form on the teeth beneath it — the opposite of the situation with the lingual plate.

3.11 Labial Bar Slides

• As a dental student, I want a slide on the labial bar: its use for the partial denture is very rare and undesirable except in a single case — where a lingual major connector cannot be made; it is a bar similar in shape to the lingual bar but extends to the labial and buccal side of the mandible rather than the lingual side.
• As a dental student, I want a slide on the indications of the labial bar: (1) cases of tilting of the lower anterior teeth or premolars; (2) in the case of large bony tori (Torus) in the lingual region that impede placement of a lingual bar or plate — though it is not used when there is insufficient space for the metal between the lip and the gingival tissues in the vestibular region.
• As a dental student, I want a slide stating that, when there is tilting of the lower anterior teeth, it is preferable to reshape them by crowning, and that in the case of lingual bony prominences or swellings, surgical intervention may be performed if possible — in both situations the labial bar is avoided and replaced by the lingual bar or lingual plate.
• As a dental student, I want a slide on the disadvantages of the labial bar: (1) it causes great annoyance to the patient due to its pressure on the gingival tissues and its irritation of the lip because of its vestibular position; (2) it will certainly cause protrusion of the lip forward, which negatively affects esthetics because the metal of the major connector appears during speech and smiling.

3.12 Design Sequence Slides

• As a dental student, I want a slide stating that, to design the mandibular removable partial denture and simplify the process of connecting its different parts to one another, the following steps are performed: first, the locations of the areas on which the residual saddles will sit are determined on the cast.
• As a dental student, I want a slide stating the step of determining the locations of the posterior borders of the major connector.
• As a dental student, I want a slide stating the step of determining the locations of the lower borders of the major connector.
• As a dental student, I want a slide stating the step of drawing the locations of the minor connectors on the denture base and the locations of the rests on the teeth that will receive them.
• As a dental student, I want a slide stating the step of connecting all the previous data — the residual saddles with the lower and upper borders of the major connector.
• As a dental student, I want a slide (Figure A) showing the cast with the outline of the basic placement layout of the appliance.
• As a dental student, I want a slide (Figure B) showing the outline of the posterior borders of the major connector.
• As a dental student, I want a slide (Figure C) showing determination of the location of the upper border of the major connector, noting that the gap determined for the lingual bar requires using a lingual plate as the major connector; that the lingual plate requires a rest placed on the canines and the first premolar to provide positive support; and that the lingual gap between the right canine and the premolar is closed by a major connector that enhances its rigidity.
• As a dental student, I want a slide (Figure D) showing determination of the positions of the rests on the upper teeth and the minor connectors for retaining the planned acrylic denture base.

4. User Personas

• Lecturer / Instructor — the user who uploads the lecture PDF, triggers conversion, verifies that the deck meets the ≥25-slide minimum and that no content has been added, and presents the slides in teaching.
• Dental Student / Learner — the user who reads the generated slides in sequence to study the lecture on mandibular major connectors.

System actor: the source lecture PDF — treated as the authoritative input artifact from which all slide content is drawn.

5. Core User Flows

Flow 1 — Lectuer converts the lecture into slides

1. Lecturer uploads the lecture PDF (تعويضات متحركة جزئية، الوصلات الرئيسية الكبرى في الفك السفلي).
2. System reads the Arabic text and embedded figures.
3. System segments the lecture into headings, sub-headings, bullet points, lists, measurements, and figure blocks.
4. System composes slides in source order, preserving Arabic right-to-left text and English technical terms as written.
5. System carries figures through with their labels (A–E connector shapes, Figure A–D design steps, labeled lingual-bar component diagram).
6. System emits a deck of no fewer than 25 slides.
7. Lecturer reviews the deck against the lecture to confirm nothing was added and no source detail was dropped.
8. Lecturer uses the deck in the lecture.

Flow 2 — Student studies the topic

1. Student opens the deck and advances slide by slide in the lecture's own order.
2. Student reads the examination, radiographic, and framework material.
3. Student reads the four-part framework structure (saddle, major connector, retention, support).
4. Student reads the major-connector characteristics (rigidity, 6 mm / 3–4 mm margins, parallelism and relief, comfort, 4 mm / 8 mm rules, rounded borders).
5. Student studies each mandibular major connector type (lingual bar, lingual plate, sublingual bar, cingulum bar, labial bar) with its shape, dimensions, indications, advantages, and disadvantages.
6. Student follows the cast design sequence steps and their figures (A–D).

6. Visuals, Colors, and Theme

Not specified in the source material or the request; the following restrained defaults are derived from the material's character — a clinical, academic dental lecture delivered in Arabic.

• Theme: clean clinical-atlas appearance, optimized for lecture projection and readability.
• Background: light neutral (near-white) to keep focus on text and clinical figures.
• Primary accent: a calm medical teal/blue used for headings, borders, and figure callouts.
• Secondary accent: a muted neutral gray for body rules and figure captions.
• Typography: a clear Arabic (RTL) typeface at large projection sizes, with English technical terms set in a paired Latin face at matching size; English term equivalents (e.g., Lingual Bar) kept beside the Arabic terms exactly as in the source.
• Figures: clinical photographs and line diagrams reproduced as-is on light backgrounds, with their existing labels preserved.

7. Signature Design Concept

"Clinical Atlas Plates" — each slide is treated as a single anatomical/clinical plate:

• A consistent title band carrying the Arabic heading with its English equivalent beneath it.
• One core idea per slide, matching the lecture's own sub-headings.
• Measurement values (6 mm, 3–4 mm, 8 mm, 5 mm, 1.5–2 mm, 3 mm, 4 mm, 6 mm, 0.2 mm, 2 mm) emphasized so they are immediately visible.
• Figure slides that reproduce the source diagram with its original letter/number callouts (A–E, A–D, 1–6) intact.

8. Interaction Model & Motion Direction

• Reading direction: right-to-left, consistent with the Arabic lecture text; English terms embedded in their source position.
• Progression: linear, slide-by-slide in the lecture's order — no branching, since the source is a sequential lecture.
• Transitions: minimal, lecture-appropriate (simple fades) so projection remains legible and does not distract from clinical figures.
• Figure emphasis: the only motion is a subtle reveal/highlight of figure callouts when a diagram slide appears; no decorative animation.

9. Non-Functional Requirements

• Fidelity: the deck must contain only content present in the uploaded lecture; no added explanation, examples, images, or data.
• Completeness: every section, sub-heading, list, definition, characteristic, indication, advantage, disadvantage, measurement, and figure of the lecture must be represented.
• Slide count: the deck must contain at least 25 slides.
• Ordering: source order must be preserved.
• Terminology: Arabic terms and their English equivalents must be reproduced exactly as in the source.
• Numeric accuracy: all dimensional and safety values must be reproduced exactly as written in the lecture.
• Figure integrity: embedded diagrams and photographs must retain their labels and callouts (A–E connector shapes; A–D design steps; the numbered lingual-bar component callouts 1, 2a, 2b, 2c, 3, 4, 5, 6).
• Language rendering: Arabic right-to-left text must render correctly without character-shaping errors.
• Reproducibility: regenerating the deck from the same source must yield the same slide content.

10. Tech Stack

The accepted delivery shape is a presentation deck produced from a PDF lecture, so only the layers that shape requires are included:

• Source ingestion layer: Arabic PDF text extraction plus extraction of embedded figures/images from the uploaded lecture.
• Content structuring layer: segmentation of the extracted lecture into ordered headings, sub-headings, bullet lists, measurement values, and figure blocks.
• Slide composition layer: assembly of segmented content into slides with Arabic RTL text, preserved English technical terms, and carried-over labeled figures.
• Output layer: a presentation file (deck) of no fewer than 25 slides suitable for lecture projection.

No authentication, database, admin, payment, or account layers are included, because the source material and request do not require them.

11. Assumptions and Constraints

• Single source of truth: the uploaded lecture PDF is the only permitted content source; no external clinical references may be introduced.
• No additions constraint: the system must not author original content, opinions, or examples.
• Minimum length constraint: the output deck must be no fewer than 25 slides.
• Language constraint: content is Arabic with English technical terms retained as in the source.
• Domain constraint: content is restricted to prosthodontics — the clinical/diagnostic preparation, framework, and especially the mandibular major connectors described in the lecture.
• Figure dependency: the source contains labeled diagrams (connector shapes A–E, design-step figures A–D, and a numbered lingual-bar component diagram) that must be reproduced with their labels.

12. Glossary

• Removable Partial Denture (RPD): the prosthesis whose structure contains a saddle, major connector, retention elements, and support elements.
• Major Connector (الوصلة الرئيسية / الكبرى): the rigid part of the RPD that joins the components on one side of the arch to those on the opposite side; the framework of the appliance.
• Minor Connector (الوصلة الصغرى): the connector linking components such as the rests and the denture base to the major connector.
• Saddle (السرج): the part resting on the edentulous areas of the jaw and carrying the artificial teeth.
• Denture Base (قاعدة الجهاز): the section of the saddle in direct contact with the mucosa, covering a wide area defined by adjacent movable mucosa.
• Denture Body (جسم الجهاز): the section substituting for the resorbed residual ridge, carrying artificial teeth and providing lip and cheek support.
• Artificial Teeth (الأسنان الاصطناعية): the replacement teeth that restore occlusion, mastication, and esthetics.
• Direct Retainer (المثبت المباشر): a retention element acting directly on an abutment tooth.
• Indirect Retainer (المثبت غير المباشر): a component that resists displacement of the free-end saddle, often a minor connector with an occlusal rest.
• Rest (المهماز): a support element seated on a tooth to provide support.
• Lingual Bar (القوس اللساني): the most common mandibular major connector; half-pear shaped, ~5 mm wide and 1.5–2 mm thick, 3 mm from the gingival papillae, with a relief beneath it.
• Sublingual Bar (القوس تحت اللساني): an alternative to the lingual bar placed lower and posterior, 4 mm below the free gingival margin (6 mm posteriorly), at least 0.2 mm from the residual ridge.
• Continuous Cingulum Bar (سلك الاستناد المستمر): a bar placed on the lingual surfaces of the lower anterior teeth, used alone or with a lingual bar beneath it.
• Lingual Plate (الصفيحة اللسانية): a major connector combining a half-pear lingual bar with a metal plate covering the lingual surfaces of the lower anterior teeth, requiring at least two rests.
• Labial Bar (القوس الشفوي): a rare connector extending to the labial/buccal side of the mandible, used only when a lingual connector cannot be made.
• Relief (الريليف الوقائي): the space left between the metal of the connector and the soft tissue it crosses.
• Residual Ridge (الحافة السنخية): the remaining alveolar ridge after tooth loss.
• Torus (العرن): a bony prominence/exostosis on the lingual side that may impede a lingual connector.
• Kennedy Class I and Class II: partial edentulism classifications referenced in relation to indirect retention.
• Tissue Caliper (مسبر الأنسجة الداعمة السنية): the instrument used to measure the distance between the floor of the mouth and the free gingival margins.
• Gingival Margin / Free Gingival Margin (الحواف اللثوية الحرة): the reference edge used for all connector clearance measurements.