**Imaging Modality:** Intraoral periapical radiograph. **Anatomical Region:** Mandibular posterior segment, involving multiple permanent teeth and their associated supporting structures. **Observed Pathology:** The radiograph demonstrates significant generalized horizontal bone loss. There is a prominent vertical (angular) bony defect distal to the second premolar/mesial to the molar. A radiopaque restorative material is visible on the distal-occlusal aspect of the crown of the most posterior tooth shown. **Characteristic Visual Features:** * **Alveolar Bone:** Reduction in the height of the alveolar crest relative to the cementoenamel junction (CEJ), indicating periodontitis. * **Periodontal Ligament (PDL) Space:** Widening of the PDL space is visible along the root surfaces of the affected teeth. * **Trabecular Pattern:** Normal to slightly decreased radiodensity of the interdental bone, consistent with inflammatory bone resorption. * **Root Anatomy:** The roots appear intact without evidence of external resorption; however, the lack of bone support is evident in the cervical and middle thirds of the roots. **Diagnostic Features:** Horizontal and vertical bone resorption patterns characteristic of chronic periodontal disease. The image captures the baseline state of periodontal destruction prior to therapeutic intervention.

This diagnostic intraoral radiograph (periapical view) illustrates different patterns of periodontal alveolar bone loss in the mandibular right molar region. The image focuses on teeth 46 (first molar) and 47 (second molar). Adjacent to tooth 46, the alveolar bone crest exhibits a horizontal bone loss pattern, characterized by a relatively flat, horizontal reduction in bone height parallel to the cementoenamel junction (CEJ) of adjacent teeth. In contrast, the distal aspect of tooth 47 demonstrates a vertical (angular) bone loss pattern, where the bone defect forms an oblique angle relative to the root surface, creating an intrabony pocket. The radiographic appearance highlights key diagnostic criteria for periodontitis staging, showing the distinction between generalized crestal height reduction and localized vertical osseous defects. Such imaging is critical in dental education for clinical decision-making regarding non-surgical vs. regenerative surgical periodontal therapies.

**Imaging Modality:** Intraoral periapical radiograph. **Anatomical Region:** Maxillary posterior quadrant, including premolar and molar regions. **Observed Pathology:** Advanced periodontal bone loss. There is significant localized vertical (angular) bone loss and horizontal bone resorption affecting the interdental alveolar crests. **Characteristic Visual Features:** - **Bone Loss:** A deep, U-shaped radiolucent vertical defect is visible between the second premolar and first molar, extending towards the middle third of the roots. - **Dentition:** The radiograph shows permanent maxillary teeth with visible pulp chambers and root canal morphology. A radiopaque restoration is noted on the occlusal/coronal surface of the second premolar. - **Periodontal Ligament (PDL):** Widening of the PDL space is suggestive of secondary occlusal trauma or active inflammatory periodontal disease. - **Trabecular Pattern:** Normal to slightly decreased radiodensity of the surrounding alveolar bone. **Key Diagnostic Features:** Presence of severe interproximal vertical osseous defects and reduction in the height of the alveolar crest relative to the cemento-enamel junction (CEJ), characteristic of chronic periodontitis.

This orthopantomogram (OPG) provides a comprehensive radiographic view of the maxilla and mandible, illustrating advanced generalized periodontal disease. The primary clinical finding is widespread, severe alveolar bone loss affecting both arches. The bone destruction presents as a combination of horizontal resorption and significant vertical (angular) defects. Notably, teeth 13 (maxillary right canine) and 33 (mandibular left canine) demonstrate advanced vertical bone defects characterized by deep, narrow radiolucent areas extending apically along the root surfaces. The alveolar crest appears irregular and uneven throughout, with varying bone density indicative of active resorption and loss of cortical plate integrity. Multiple teeth exhibit increased spacing (pathologic migration) and secondary signs of clinical attachment loss. The maxillary sinuses and mandibular canals are visible as landmarks. This imaging is diagnostic for generalized aggressive periodontitis, emphasizing the pattern of destruction in a potentially young patient where the severity of bone loss is disproportionate to local factors like plaque or calculus.

This diagnostic image is a periapical radiovisiography (RVG) radiograph showing the mandibular left first molar (tooth 36) in a pre-operative clinical state. The radiograph demonstrates a significant periodontal bone defect characterized by radiolucency surrounding the mesial and distal roots. Specifically, there is evidence of furcation involvement, where the interradicular bone is diminished. Two vertical measurement lines with digital calipers are visible: one measuring 9.2 units indicating the vertical depth of the mesial osseous defect relative to the cementoenamel junction or bone crest, and another measuring 5.3 units quantifying the height of the furcation defect. The surrounding alveolar bone shows a loss of normal trabecular pattern and increased radiolucency, indicative of inflammatory bone resorption or periodontal disease. The image is intended for dental education regarding the assessment of infrabony defects and the planning of regenerative periodontal therapy.

This composite diagnostic image illustrates the application of Cone Beam Computed Tomography (CBCT) and Orthopantomography (OPG) in dental radiology for evaluating periodontal osseous lesions. Panel A displays a panoramic OPG, providing a wide-field view of the maxilla, mandible, and full dentition to identify alveolar crest levels and general bone loss. Panel B presents a tangential CBCT view, optimized for measuring interproximal osseous defects between adjacent teeth. Panel C shows a cross-sectional (buccolingual) slice, used to detect bone loss and cortical plate integrity on the buccal and lingual aspects. Panel D features an axial CBCT view of the mandible, demonstrating the relationship between molar roots and the surrounding alveolar bone, particularly useful for identifying furcation involvement and defects. The top right panel provides a 3D volumetric reconstruction of the skull and dentition. Key educational concepts include the multi-planar assessment of bone height, the detection of vertical and horizontal osseous defects, and the identification of furcation radiolucencies in periodontology.

**Imaging Modality:** Intraoral periapical radiograph. **Anatomical Region:** Maxillary posterior dentition, including premolars and molars. **Observed Pathology/Disease Entity:** - **Periodontal Bone Loss:** Evidence of generalized horizontal bone loss and localized vertical (angular) osseous defects. - **Furcation Involvement:** Visible radiolucency in the furcation area of the depicted maxillary molar, indicating Class II or III furcation involvement. - **Dental Caries:** Radiopacities and radiolucencies suggest possible interproximal caries and existing dental restorations. **Characteristic Visual Features:** - **Alveolar Crest:** The crestal bone is apical to the normal level (1–2 mm below the cemento-enamel junction), indicating chronic periodontitis. - **Trabecular Pattern:** Normal to slightly decreased density of the interdental bone. - **Root Morphology:** Clearly visible root canals and periodontal ligament (PDL) spaces; some widening of the PDL space is noted. - **Anatomical Landmarks:** The floor of the maxillary sinus is visible superior to the root apices. **Key Diagnostic Features:** Presence of significant clinical attachment loss as evidenced by the radiographic distance between the CEJ and the alveolar crest, and the involvement of multi-rooted teeth furcations.

A series of five intraoral clinical photographs (A-E) documenting a periodontal surgical procedure for bone resorption and furcation involvement. Image A shows the preoperative state of a tooth with a deep abfraction—a wedge-shaped, dark-pigmented cervical lesion at the cementoenamel junction. Image B illustrates the vestibular aspect following the elevation of a full-thickness mucoperiosteal flap, revealing extensive alveolar bone resorption. Image C provides a mesial view of the exposed roots, highlighting Class II or III furcation involvement and total bone loss on the mesial-vestibular aspect. Image D demonstrates the application of Leukocyte-Platelet-Rich Fibrin (L-PRF) concentrate, where fibrin membranes are layered over the root surfaces to promote tissue regeneration. Image E shows the final surgical stage with the repositioned soft tissue flap secured by interdental polyglactin (Vicryl) sutures. This sequence illustrates advanced periodontal management using regenerative biomaterials to address significant attachment loss and osseous defects.