The premature loss of a primary tooth is a common event in the growing child, and the premature loss of the primary first molar before its successor is ready is a particular problem. The loss of the primary first molar often passes without obvious symptoms, but the consequences for the permanent ...

The gingival biotype describes the thickness and the contour of the gingiva around a tooth or an implant, and it strongly influences the prognosis of every restorative and periodontal procedure. A thin, scalloped biotype is fragile: recession follows minimal trauma, the soft tissue shows through ...

The eruption of the primary teeth is one of the earliest milestones of craniofacial development, and it matters to the pediatric dentist for more than its visual charm. The pattern in which the deciduous teeth appear establishes the arch form, guides the chewing development, and lays the groundwo...

The removal of mandibular third molars is among the most common operations in oral and maxillofacial surgery, and it carries a small but serious risk of damage to the lingual nerve. Injury to this nerve is disabling out of proportion to its frequency, because it produces numbness, altered taste, ...

The mandibular second molar is considered less often than the third molar in discussions of impaction, yet when it fails to erupt the consequences can be substantial. A retained second molar undermines mastication, invites caries and periodontal disease in the adjacent teeth, and can trigger root...

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...