为什么牙齿会蛀？
Why do teeth get cavities?
细菌分解糖产酸，酸蚀牙釉质形成龋洞。
Bacteria turn sugar into acid that erodes enamel.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
《默克家庭医学手册》Merck Manual Home Health Handbook 中译版,人民卫生出版社
The Merck Manual Home Health Handbook, Chinese ed., PMPH
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787117181631（按标识回读: 默克家庭医学手册）
#龋齿 #细菌 #酸
后牙完成根管治疗后,医生为何通常建议尽快安装全冠而不是仅用树脂充填?
After root canal treatment on a posterior tooth, why is a full crown usually recommended instead of a direct resin filling?
根管治疗后牙齿失去牙髓的血供与水分维持,加上洞壁被大量磨除,残余牙尖的抗折能力明显下降。冠方封闭不良还是根管系统再感染的主要通道,全冠提供的环抱力可将患牙折裂风险降低约一半。磨牙区咬合负荷最大,单纯树脂充填很难长期胜任。
A pulpectomized tooth loses pulpal blood supply and dentinal moisture, and with extensive wall removal the remaining cusps fracture far more readily under occlusal load. Defective coronal seal is also a leading route of endodontic reinfection, and full-coverage crowns cut the risk of tooth fracture roughly in half. Posterior teeth bear the heaviest chewing forces, so resin alone rarely provides durable protection.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：本题原挂出处与答案内容不符，已撤回；具体书目待补，暂不展示来源。
本题原挂出处与答案内容不符，已撤回；具体书目待补。
Previous citation withdrawn as unsupported for this answer; a specific source is pending.
#根管治疗 #牙冠修复
为什么牙髓炎的疼痛常在夜间加重,而深龋的疼痛多由冷热刺激诱发?
Why does pulpitis pain typically flare at night, while deep-caries pain is provoked mainly by hot or cold stimuli?
深龋阶段牙髓尚未发生不可逆炎症,冷热刺激经牙本质小管传导,刺激去除后疼痛随即消失。炎症波及髓腔后腔内压力升高,平卧又使头部血液回流增加、髓腔充血加重,疼痛转为自发性、阵发性并在夜间加剧。自发痛、放散痛与夜间痛并存提示不可复性牙髓炎,通常需要根管治疗。
In deep caries the pulp is not yet irreversibly inflamed; thermal stimuli travel through dentinal tubules and the pain stops once the stimulus is removed. Once inflammation involves the pulp chamber, internal pressure rises and lying down increases venous return to the head, engorging the pulp, so pain turns spontaneous, throbbing, and worse at night. Spontaneous, referred, and night pain together indicate irreversible pulpitis, which usually requires root canal treatment.
难度 进阶 · 适合 大众
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：本题原挂出处与答案内容不符，已撤回；具体书目待补，暂不展示来源。
本题原挂出处与答案内容不符，已撤回；具体书目待补。
Previous citation withdrawn as unsupported for this answer; a specific source is pending.
#牙髓炎 #龋病
下颌阻生智齿为什么容易反复引起冠周炎?
Why does an impacted mandibular third molar cause recurrent pericoronitis?
下颌第三磨牙常因颌骨空间不足而呈近中或水平阻生,牙冠部分被龈瓣覆盖,形成盲袋。盲袋内易滞留食物残渣与细菌,在咬合创伤或疲劳、感冒等抵抗力下降时,袋内厌氧菌大量繁殖引发冠周炎,出现张口受限和吞咽痛。反复发作提示盲袋无法自洁,急性期控制后通常建议拔除阻生牙。
The mandibular third molar frequently erupts mesioangular or horizontal because the jaw lacks space, leaving part of the crown covered by an operculum that forms a blind pocket. Food debris and bacteria collect in the pocket; when occlusal trauma or lowered resistance from fatigue or a cold tips the balance, anaerobes proliferate and pericoronitis flares with trismus and pain on swallowing. Recurrent episodes mean the pocket cannot self-cleanse, so extraction is usually advised once the acute phase is controlled.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
Expert consensus on the management of third molar health, International Journal of Oral Science, 2025
Expert consensus on the management of third molar health, International Journal of Oral Science, 2025
独立核验依据 · Independent verification: 核验依据 1 EUROPEPMC 标识 41980927：Expert consensus on the management
#智齿冠周炎 #阻生第三磨牙