The final crown on a dental implant can be attached to the abutment in two fundamentally different ways: by a screw that passes through the crown into the implant, or by dental cement that bonds the crown onto an abutment. The choice between screw-retention and cement-retention is one of the earl...

Apical periodontitis is not primarily a disease of the periapical bone but an inflammatory response to an infection that originates inside the root canal. The periapical lesion is a host reaction to bacteria delivered through the apical foramen, so treatment must eliminate the microbial source. T...

The force that a fixed orthodontic appliance applies to a tooth depends on more than the bracket and the archwire. The way the archwire is secured inside the bracket slot, the ligation, determines how much of the wire's stored energy is transmitted to the tooth and how much friction resists the d...

The introduction of nickel-titanium (NiTi) rotary instruments has transformed modern root canal treatment, allowing curved canals to be shaped more rapidly and predictably than with stainless steel hand files. Yet every clinician who uses rotary systems must also manage a distinct hazard: instrum...

Between the diagnosis of a pulp problem and its definitive treatment, a clinician needs a dependable interim: a material that seals the cavity, protects the treated pulp, and holds the medicament until the next visit. Zinc oxide eugenol (ZOE) and its reinforced form, IRM, have served this role fo...

Clear aligner therapy has moved from a niche option to one of the most popular forms of orthodontic treatment, valued by patients for its appearance. Yet the aligner is not a magic appliance: a smooth plastic shell has limited ability to grip a tooth without help from attachments. Attachments, sm...

The way the teeth meet when the jaw moves is one of the most consequential decisions in restorative dentistry. In a canine-guided occlusion, the upper and lower canines take over the guidance of the mandible during lateral movements, so that the posterior teeth are disengaged and the load is carr...

Porcelain veneers are thin ceramic shells that are bonded to the facial surfaces of anterior teeth to improve their color, shape, alignment, and overall appearance. They have become one of the most requested esthetic procedures in modern dentistry because they offer predictable, long-lasting resu...

Myofascial pain is one of the most common causes of chronic pain in the head and neck region, yet it is frequently overlooked or misdiagnosed. It arises from hypersensitive bands within skeletal muscle, known as trigger points, which produce local tenderness and characteristic patterns of referre...

Inlay and onlay restorations are indirect restorations that replace missing tooth structure without the circumferential coverage of a full crown. An inlay fits within the cusps of a tooth, while an onlay extends over one or more cusps, distributing occlusal forces more favorably and preserving so...

The gingival biotype describes the thickness and form of the gingiva that surrounds the teeth, and it has become a central concept in periodontal therapy, implant dentistry, and restorative treatment planning. A thick biotype is associated with deeper probing depths, a scalloped gingival margin, ...

A posterior crossbite occurs when one or more of the upper back teeth bite inside the lower back teeth, so that the buccal cusps of the maxillary molars and premolars sit lingual to the mandibular cusps. It is one of the most common malocclusions in the mixed dentition and, when left untreated, i...

Physiologic root resorption is the normal, programmed process by which the roots of primary teeth are progressively dissolved so that the crowns can exfoliate and make room for the permanent successors. It is a tightly regulated event that begins near the apex, advances toward the crown, and is c...

A periapical abscess is an acute collection of pus at the apex of a tooth root, the endpoint of an endodontic infection that has escaped the confines of the root canal and entered the surrounding bone. The pressure of the accumulating pus produces intense pain, and when the infection spreads thro...

The maxillary canine is the second most frequently impacted tooth after the third molar, and its proper eruption is essential for a functional occlusion, a stable arch, and an esthetic smile. When the canine fails to erupt, it may remain buried in the palate or the alveolus, and the management of...

A diastema is a gap between teeth, and the term is most commonly applied to the space between the upper central incisors, the midline diastema. It is a frequent esthetic complaint, because the anterior teeth dominate the smile, and it may be a normal feature of the developing dentition in childre...

Bruxism, the involuntary clenching and grinding of the teeth, affects a substantial proportion of adults and children and is a major cause of tooth wear, muscle pain, headache, and temporomandibular disorders. Conventional management relies on occlusal splints, behavioral modification, and muscle...

Torus mandibularis and torus palatinus are benign bony overgrowths that arise on the lingual surface of the mandible and on the midline of the hard...

Oral pigmented lesions are a diverse group of conditions that appear as areas of abnormal color in the oral mucosa, ranging from brown and black...

Gingivoplasty is a periodontal surgical procedure designed to reshape the gingiva and restore a natural, harmonious contour to the gum line. Unlike...

Fusion and gemination are developmental dental anomalies in which two teeth appear to be joined together, producing a single crown that is wider than...