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臼齿是哪几颗？第二大臼齿为什么重要？｜證據鏈

km 編輯部2026-08-13阅读约 36 分钟
#證據鏈#牙醫KM#智齒#咬合

本頁是〈臼齿是哪几颗？第二大臼齿为什么重要？〉的事實單元帳：每一條主張對應的來源、證據等級、地域與期間、原文引句與限制，逐條攤開。

臼齿是哪几颗？第二大臼齿为什么重要？｜證據鏈

F-Units（事实单元账）

以下每条的 `span` 为来源原文逐字引用，原语言为英文，沿用母版的 「」 标记，不翻译、不改写、不重排词序；中文部分为本卡的转述与限制说明。
  • F1｜confidence: verified｜basis: internal_dataset｜period: 2025-03 至 2026-08 GSC｜geo: TW｜span: backlog #21 的 10 词项合计曝光 156,468，跨 共 6 站（逐笔词×站×曝光见 km-dental-backlog.md #21 附录）｜caveat: 曝光为资产级数字、非去重流量；发布转档时本条不输出（2026-08-05 内部数据不进可见层裁定）
  • F2｜confidence: verified｜basis: textbook（StatPearls，PMID 34033352）｜period: 条目更新 2023-05-22，2026 年版本｜geo: universal｜span: 「There are typically 20 deciduous teeth divided evenly across the maxilla and mandible」「The deciduous teeth eventually exfoliate and are replaced by 32 permanent teeth: 16 in the maxilla and 16 in the mandible」「Permanent teeth are classified as incisors, canines, premolars, and molars, while primary teeth do not include premolars」｜caveat: 教科书型条目，非原始研究；牙齿数目为典型值，个体可有先天缺牙或多生牙
  • F3｜confidence: verified（2026-08-06 以 ego-browser 取回 NCBI Bookshelf 全文并逐字比对）｜basis: textbook（StatPearls, Anatomy, Head and Neck, Teeth；NBK557543）｜period: 条目 2023-07-24 更新｜geo: universal｜span: 「The primary incisors, canines, and molars get replaced by the successional permanent incisors, canines, and premolars. Permanent dentition also consists of the additional teeth that are three types of molars - first, second, and third」｜caveat: span 取自 Bookshelf 全文页（非 PubMed 摘要），故本条不标 PMID 前缀以免 km-gate --spans 对错文本比对；PubMed 条目见来源 #2
  • F4｜confidence: verified（同 F3 取回方式）｜basis: textbook（NBK557543）｜period: 条目 2023-07-24 更新｜geo: universal｜span: 「The permanent first molars erupt between 6 to 7 years of age. The permanent second molars erupt between 11 to 13 years of age. The permanent third molars erupt between 17 to 21 years of age if there is room for them」｜caveat: 教科书给的是典型区间，与人群研究的区间不完全相同（见 F13）；不可作为个别儿童的判准
  • F5｜confidence: verified（同 F3 取回方式）｜basis: textbook（NBK557543）｜period: 条目 2023-07-24 更新｜geo: universal｜span: 「In the maxilla, permanent adult teeth are numbered 1 through 16 from right to left, and primary teeth are labeled with letters A through J from right to left. In the mandible, permanent adult teeth are numbered 17 through 32 from left to right, and primary teeth are labeled with letters K through T from left to right」｜caveat: 该条目以美国通用编号为叙述主体，非国际标准；跨国就诊时不可假设对方用同一套
  • F6｜confidence: verified（同 F3 取回方式）｜basis: textbook（NBK557543）｜period: 条目 2023-07-24 更新｜geo: universal｜span: 「Teeth provide a masticatory system that functions in the incising, tearing and grinding of food」「Retention of function, aesthetics, and natural dentition of at least 20 teeth with nine to ten occluding pairs (including anterior teeth) is associated with adequate masticatory efficiency and ability」｜caveat: 为牙列整体的功能叙述，非单颗牙齿的重要性排序；原文为关联陈述，非因果。世界卫生组织把牙齿数量视为口腔健康状态重要指标一句，位于上列两段 span 之间，同页全文可查（2026-08-06 复验：「The World Health Organization (WHO) considers the number of teeth to be a key indicator of oral health status」），本条 span 沿用母版原样、未扩写
  • F7｜confidence: verified（2026-08-06 以 ego-browser 实测可及，curl 回 403 为工具侧阻挡；标准页与 OBP 公开段落逐字比对）｜basis: official_statement（国际标准 ISO 3950:2016，ISO/TC 106/SC 3）｜period: 2016 年第四版，2022 年复审确认仍现行；ISO/AWI 3950 修订中｜geo: universal｜span: 「This International Standard provides a system for designating teeth or areas of the oral cavity using two digits」「The system described in this International Standard was originally drawn up by the FDI World Dental Federation and approved by the World Health Organization (WHO) and Technical committee ISO/TC 106, Dentistry」「This fourth edition cancels and replaces the third edition (ISO 3950:2009), which has been technically revised」｜caveat: 标准正文的第 4 章（牙齿指定）为付费内容，本卡未取得其逐字文字，象限与牙位的对应改以 F8、F9 的公开文献描述为据
  • F8｜confidence: verified（2026-08-06 以 efetch db=pmc 本机取回全文，并以 ego-browser 于 PMC 页面逐字复验）｜basis: peer_reviewed（Journal of Imaging 2026；PMC13301722）｜period: 2026-06 刊出｜geo: universal｜span: 「This system encodes the position of each tooth using a two-digit number: the first digit denotes the quadrant (1–4, corresponding to the upper right, upper left, lower left, and lower right, respectively), and the second digit represents the tooth’s position within that quadrant (1–8, counted from the midline posteriorly)」｜caveat: 本文为影像辨识研究对标准的描述（非标准原文）；span 取自 PMC 开放获取全文而非 PubMed 摘要，故不标 PMID 前缀，PubMed 条目见来源 #16
  • F9｜confidence: verified（2026-08-06 以 efetch db=pmc 本机取回全文逐字比对）｜basis: peer_reviewed（Saudi Dent J 2016；PMC5110463）｜period: 2016 刊出｜geo: universal｜span: 「Zsigmondy developed a numbering sequence from 1 to 8 for permanent dentition, starting from the central incisor (1) until the third molar (8), and roman numerals I to V (later modified, A to E) for primary dentition」「uses consecutive integers, beginning with the upper right third molar (designated as #1), and counts clockwise around the dentition, finishing with the lower right third molar (designated as #32)」「The first digit indicates the quadrant and the second digit refers to the tooth」｜caveat: 该研究的调查人群限沙特阿拉伯的牙科机构主管，其使用率调查结果不可外推到其他地区；本卡仅引用其对三套系统的描述段落，未引用使用率结论；span 取自 PMC 开放获取全文，不标 PMID 前缀，PubMed 条目见来源 #15
  • F10｜confidence: verified｜basis: peer_reviewed（PMID 8349894）｜period: 1993 刊出｜geo: universal｜span: 「Today, three systems are favored worldwide: the Zsigmondy/Palmer system, the universal system, and the FDI two-digit system」｜caveat: 1993 年文献，用于佐证「三套并存」这一结构事实；其对各系统优劣的主张本卡不引用
  • F11｜confidence: verified｜basis: peer_reviewed（PMID 24025897）｜period: 2013 刊出｜geo: universal｜span: 「Three systems are favored worldwide: the Zsigmondy/Palmer system, the Universal system, and the Federation Dentaire Internationale (FDI) Two-Digit system」「The FDI Two-Digit system is widely used throughout the world, except USA」｜caveat: 该文主旨为提出多生牙标记法的新增规则，本卡仅引用其对现行三套系统的描述
  • F12｜confidence: verified｜basis: peer_reviewed（PMID 38298675）｜period: 2024 刊出｜geo: universal｜span: 「The outcome of a questionnaire disseminated among 66 personnel showed the confusion existing among currently used tooth numbering systems」｜caveat: 问卷仅 66 人、单一机构型样本，只能说明混淆存在，不能量化其普遍程度；该文所提的新系统本卡不引用亦不推荐
  • F13｜confidence: verified｜basis: peer_reviewed（PMID 38426348，系统综述与荟萃分析）｜period: 检索至 2023-04，2024 刊出｜geo: universal｜span: 「The mandibular first molar eruption was found to be as early as 4.09 years while the maxillary second molar erupted as late as 13.45 years」「included from 80 studies of which, 41 were carried out in Asia」「Meta-regression interpreted tooth eruption to be earlier in females and in the mandible」｜caveat: 纳入研究以横断面与纵向研究混合，各国定义与判读标准不一；引用的是人群区间端点，非个别儿童的标准
  • F14｜confidence: verified｜basis: peer_reviewed（PMID 28644755）｜period: 2009 至 2014 调查资料，2017 刊出｜geo: universal（美国代表性样本）｜span: 「Forty-eight percent of 6-y-olds and 98% of 8-y-olds had all FPMs emerged, whereas SPM emergence varied more」｜caveat: 资料源为美国全国健康与营养调查，人群组成与其他地区不同；该研究主旨为 BMI 与萌出时间的关联，本卡未引用其关联结论。原文的 FPM＝第一恒大臼齿、SPM＝第二恒大臼齿，「all FPMs」指四颗都已萌出
  • F15｜confidence: verified｜basis: peer_reviewed（PMID 10620156）｜period: 1999 刊出｜geo: universal｜span: 「These variables were recorded using the Dental Prescale System in 16 healthy young adults」「The distribution of the occlusal force was greatest at the molar region followed by the premolar and anterior teeth region」「The proportion of occlusal force (occlusal force at each region/total occlusal force) on molar regions increased as clenching strength increased」｜caveat: 样本仅 16 位健康年轻成人的实验室测量，非人群调查；只支持「区域间分布方向」，不支持任何个别牙齿的力量数值。正文以「咬合压力测量系统」描述该量测装置，不写入产品名（产品名保留于本条 span 供溯源）
  • F16｜confidence: verified｜basis: peer_reviewed（PMID 26066662，系统综述）｜period: 2003 至 2014 检索，2015 刊出｜geo: universal｜span: 「Studies exposing data on subjects with SDA (3-5 posterior occluding pairs) or ESDA (0-2 posterior occluding pairs) and on masticatory performance with RDP were included」「Comminution or mixing ability in subjects with (E)SDA was 28-39% lower compared to that of subjects with complete dentitions」｜caveat: 纳入研究数少；与本站 KM-DENTAL-34 卡为同一锚，该卡有完整脉络，本卡仅引用不重写。SDA＝短牙弓、ESDA＝极短牙弓，为该研究自订的分组定义
  • F17｜confidence: verified｜basis: peer_reviewed（PMID 39853442，系统综述与荟萃分析）｜period: 纳入近十年文献，2025-01 刊出｜geo: universal｜span: 「Thirteen studies met the inclusion criteria and underwent analysis; they included a total of 13,788 patients」「The overall prevalence of caries in MSMs adjacent to IMTMs was 29.89% (CI 95%: 21.05 - 38.74%; p < 0.001)」「the mesioangular position was the most frequently associated with caries with 43.37%」｜caveat: 为患病率（prevalence，横断面）的合并，非发生率（incidence），不能推论因果；纳入研究质量以 Newcastle-Ottawa 量表评估，异质性未于摘要报告。原文 MSM＝下颌第二大臼齿、IMTM＝阻生下颌第三大臼齿（智齿）
  • F18｜confidence: verified｜basis: peer_reviewed（PMID 32112019，系统综述）｜period: 检索至 2016-06，2020 刊出｜geo: universal｜span: 「The search yielded 81 records and, after application of inclusion and exclusion criteria, two incidence studies were included in this systematic review」「Both cohort studies indicated that DSC incidence was higher when third molars were erupted in the intermediate term, but greater over the long term for an ageing male population」「further high-quality research is required to improve the accuracy of these findings」｜caveat: 仅 2 篇队列研究，证据极有限；其中长期结果的人群为年长男性，不可外推至一般人群。原文 DSC＝远中面龋（distal surface caries）
  • F19｜confidence: verified｜basis: peer_reviewed（Cochrane 系统综述，PMID 32368796；CD003879.pub5）｜period: 2020-05 刊出；为 2005、2012、2016 年版本之后的现行版，2026-08-06 于 PubMed 检索同题无更新版｜geo: universal｜span: 「Insufficient evidence is available to determine whether asymptomatic disease-free impacted wisdom teeth should be removed or retained」「Although retention of asymptomatic disease-free impacted wisdom teeth may be associated with increased risk of periodontitis affecting adjacent second molars in the long term, the evidence is very low certainty」「Given the current lack of available evidence, patient values should be considered and clinical expertise used to guide shared decision-making」｜caveat: 仅纳入 1 篇 RCT 与 1 篇前瞻性队列研究，证据等级低至极低；结论仅适用于无症状且无病灶的阻生智齿，不适用于已有症状者
  • F20｜confidence: verified｜basis: peer_reviewed（PMID 42320181，系统综述与荟萃分析）｜period: 在线先行发表 2026-06-11，期刊卷期标示 2026-09（本卡日期 2026-08-06 已可取得摘要并标示 Indexed for MEDLINE）；为 2016 年前次综合综述的更新版｜geo: universal｜span: 「A total of 125 data points comprising 87,282 individuals were included」「The pooled global prevalence of M3 agenesis was 23.07% (95% CI: 21.2-25.0%)」「with substantial heterogeneity across studies」｜caveat: 研究间异质性极高，区域差异大；统计的是「至少有一颗智齿先天缺失（agenesis，先天不发育）」的患病率，不是拔除或后天脱落，也不是缺四颗
  • F21｜confidence: verified｜basis: peer_reviewed（Cochrane 系统综述，PMID 28759120）｜period: 检索至 2016-08，2017-07 刊出；2026-08-06 于 PubMed 以同题检索，未见更新版｜geo: universal｜span: 「We included 38 trials that involved a total of 7924 children」「second-, third- and fourth-generation resin-based sealants prevented caries in first permanent molars in children aged 5 to 10 years」「at 24 months follow-up: OR 0.12, 95% CI 0.08 to 0.19, 7 trials」「moderate-quality evidence」「This is an update of a review published in 2004, 2008 and 2013」｜caveat: 主要证据来自 5 至 10 岁儿童与较前方的大臼齿（first permanent molars，即尾数 6 那组），部分试验为 1970 年代发表；是否适用于个别儿童或成人须由牙医师评估，本卡不作处置建议
  • F23｜confidence: verified（2026-08-06 以 efetch db=pmc 本机取回全文逐字比对）｜basis: peer_reviewed（Cureus 2026 病例报告；PMC13092278）｜period: 2026-03 刊出｜geo: universal｜span: 「The following numbered teeth correspond to the Fédération Dentaire Internationale (FDI) tooth numbering system for primary dentition. The first digit corresponds to the quadrant of the mouth, and the second digit corresponds to the tooth's position within that quadrant, numbered from the midline posteriorly」「Teeth 54 and 55 received stainless-steel crowns, and tooth 52 received a pulpotomy in the maxillary right quadrant」｜caveat: 病例报告的临床证据等级低，本卡仅引用其图说对乳牙两位数编号规则的叙述与该区代号实例，未引用任何临床内容；span 取自 PMC 开放获取全文，不标 PMID 前缀，PubMed 条目见来源 #22
  • F22｜confidence: 结构性整理（编辑框架，非外部事实宣称）｜basis: editorial_framework｜period: 2026-08-06｜geo: universal｜span: 「臼齿／小臼齿分流」「以尾数 6／7／8 称呼三颗大臼齿以避免序数混淆」「牙位号码的三个确认动作」「号码 37 与通用编号 2 号的对照示例（依 F8、F9 所述规则推算）」「与 KM-DENTAL-34 的分工声明」皆为本站依 F2 至 F21 整理的沟通用架构｜caveat: 非临床判准、非诊断工具；本卡不对牙齿作重要性排序，亦不取代牙医师评估。简体版另加「小臼齿／大臼齿 vs 前磨牙／磨牙」的译名说明，同属编辑性说明，不是新的事实宣称

来源清单

取用与验证日期均为 2026-08-06。PubMed 条目以 E-utilities efetch 取得摘要原文逐字对照，并逐条实测条目页回应 200；PMC 条目以 efetch db=pmc 取回开放获取全文；NCBI Bookshelf 与 ISO 页面以 ego-browser 实测可及并逐字比对。书目条目为英文原文，不翻译。

  1. Aruede G, Pepper T. Anatomy, Permanent Dentition. StatPearls. PMID 34033352
  2. Morris AL, Tadi P. Anatomy, Head and Neck, Teeth. StatPearls（NCBI Bookshelf 全文）
  3. Aruede G, Pepper T. Anatomy, Permanent Dentition. StatPearls（同来源 #1 的 NCBI Bookshelf 全文对照页，本卡 F-Unit 未另引其内文）
  4. ISO 3950:2016 Dentistry — Designation system for teeth and areas of the oral cavity（标准页）
  5. ISO 3950:2016 公开段落（ISO Online Browsing Platform：Foreword、Introduction、Scope）
  6. Peck S, Peck L. A time for change of tooth numbering systems. J Dent Educ. 1993. PMID 8349894
  7. Yadav SS, Sonkurla S. Sarjeev's supernumerary tooth notation system. Indian J Dent Res. 2013. PMID 24025897
  8. Shehabeldin RR, Hamama HH. Introduction of qpdb teeth numbering system. Heliyon. 2024. PMID 38298675
  9. Vandana S, et al. Global variations in eruption chronology of permanent teeth: A systematic review and meta-analysis. Am J Hum Biol. 2024. PMID 38426348
  10. Pahel BT, et al. A Contemporary Examination of First and Second Permanent Molar Emergence. J Dent Res. 2017. PMID 28644755
  11. Kumagai H, et al. Occlusal force distribution on the dental arch during various levels of clenching. J Oral Rehabil. 1999. PMID 10620156
  12. Liang S, et al. Effects of removable dental prostheses on masticatory performance of subjects with shortened dental arches: A systematic review. J Dent. 2015. PMID 26066662
  13. Revuelta-Cortés P, et al. Prevalence of distal caries in second molar associated with impacted mandibular third molar. Clin Oral Investig. 2025. PMID 39853442
  14. Toedtling V, et al. A systematic review of second molar distal surface caries incidence in the context of third molar absence and emergence. Br Dent J. 2020. PMID 32112019
  15. Al-Johany SS. Tooth Numbering System in Saudi Arabia: Survey. Saudi Dent J. 2016. PMID 27872549（开放获取全文 PMC5110463）
  16. Structure-Guided Tooth Numbering and Lesion Localization in Visible Light Oral Images. J Imaging. 2026. PMID 42346919（开放获取全文 PMC13301722）
  17. Ghaeminia H, et al. Surgical removal versus retention for the management of asymptomatic disease-free impacted wisdom teeth. Cochrane Database Syst Rev. 2020. PMID 32368796
  18. Angelakopoulos N, et al. Third molar agenesis: An updated systematic review and meta-analysis. Arch Oral Biol. 在线先行 2026-06-11（卷期 2026 Sep）. PMID 42320181
  19. Ahovuo-Saloranta A, et al. Pit and fissure sealants for preventing dental decay in permanent teeth. Cochrane Database Syst Rev. 2017. PMID 28759120
  20. 内部数据：`analysis/reports/km-dental-backlog.md` #21 附录（词×站×曝光逐笔可对账）
  21. 编辑框架：本站「臼齿分流」「尾数称呼法」「号码确认三动作」与分工声明（无外部来源，标示为结构性整理）
  22. Bilateral Cavernous Sinus Thrombosis Secondary to Dental Infection-Induced Sinusitis: A Case Report. Cureus. 2026. PMID 42011457（开放获取全文 PMC13092278，本卡仅引用其乳牙编号图说）

内部引用链

  • 臼齿拔掉之后要不要补、有哪些补法：臼齿拔掉可以不补吗？会怎样？（KM-DENTAL-34）
  • 大臼齿龋坏了要不要补、怎么补：蛀牙了一定要补吗？补牙怎么补？（KM-DENTAL-12）
  • 拔牙（含智齿）之后伤口的愈合时间轴：拔牙的洞要多久才会长好？（KM-DENTAL-01）
发布闸门提醒：本卡为 draft。四语（zh-Hant／zh-Hans／en／ja）未齐前不得进 km_entries；F3 至 F9 的 span 取自 Bookshelf 全文、ISO 公开段落与 PMC 开放获取全文，非 PubMed 摘要，发布前人工复验请以来源清单第 2、3、4、5、15、16 条的链接为准。

FAQ

臼齿到底是哪几颗？小臼齿也算吗？
**在文献与病历里，小臼齿与大臼齿是两类不同的牙。** 恒牙分成切牙、尖牙、小臼齿、大臼齿四类 [F2]；以牙位编号来说，每个象限从中线往后数，第 4、5 颗是小臼齿，第 6、7、8 颗是大臼齿 [F8]。中文口语常把两者合称「臼齿」（也说「大牙」「槽牙」），所以描述症状时，说「上面右边往后数第几颗」会比说「臼齿」精确。
臼歯とは結局どの歯ですか。小臼歯も入りますか。 — **文献とカルテでは、小臼歯と大臼歯は別の分類の歯です。** 永久歯は切歯・犬歯・小臼歯・大臼歯の 4 つに分類されます [F2]。歯式の番号でいえば、各象限で正中から後ろへ数えて 4 番目・5 番目が小臼歯、6 番目・7 番目・8 番目が大臼歯です [F8]。日常語の「臼歯」は両方をまとめて指すので、症状を伝えるときは「臼歯」より「上の右側の奥から数えて何本目」と言うほうが正確です。
Exactly which teeth are the molars? Do premolars count? — **In the literature and in clinical records, premolars and molars are two different classes of tooth.** The permanent dentition is classified as incisors, canines, premolars and molars [F2]; by tooth number, counting back from the midline in each quadrant, teeth 4 and 5 are the premolars and teeth 6, 7 and 8 are the molars [F8]. Everyday speech in Chinese and Japanese lumps them together under one word, so when describing symptoms, "the nth tooth back on the upper right" is more precise than "my back tooth".
病历上写「37」是哪一颗牙？为什么有的地方写成别的号码？
**37 在 FDI 两位数系统里是左下象限、由中线往后第 7 颗，也就是左下的第二大臼齿 [F8][F22]。** 会出现不同号码，是因为世界上有三套并存的标记法 [F10][F11]：通用编号从右上智齿（1 号）顺时针数到右下智齿（32 号）[F9]，Zsigmondy／Palmer 则用 1 到 8 加上象限符号 [F9]。同一颗牙在不同系统下就是不同写法，看到不一致时先问是哪一套 [F12]。
カルテの「37」はどの歯ですか。別の場所では違う番号なのはなぜですか。 — **FDI の 2 桁方式では、37 は左下象限で正中から数えて 7 本目、つまり左下の第二大臼歯です [F8][F22]。** 違う番号が出てくるのは、世界に 3 つの表記法が併存しているからです [F10][F11]。ユニバーサル方式は右上の親知らず（1 番）から時計回りに右下の親知らず（32 番）まで数えます [F9]。ジグモンディ／パーマー方式は 1 から 8 に象限記号を添えます [F9]。同じ歯でも方式が違えば書き方が違うだけなので、食い違いを見たらまずどの方式かを尋ねてください [F12]。
My chart says "37" - which tooth is that? And why is it a different number elsewhere? — **In the FDI two-digit system, 37 is the lower left quadrant, seventh from the midline - the lower left second molar [F8][F22].** Different numbers appear because three notation systems coexist worldwide [F10][F11]: the universal system counts clockwise from the upper right wisdom tooth (number 1) to the lower right wisdom tooth (number 32) [F9], while Zsigmondy/Palmer uses 1 to 8 plus a quadrant symbol [F9]. The same tooth simply has different notations in different systems, so when they do not match, ask which system is in use [F12].
第二大臼齿是不是比其他牙齿重要？
**本卡查到的文献没有替牙齿排重要性顺序，因此不作这种宣称 [F22]。** 能讲的是可查证的事实：咬合力分布在大臼齿区域大于小臼齿与前牙区域（小样本测量）[F15]；后牙咬合对数较少者的咀嚼表现较低 28% 至 39% [F16]；约 23.07% 的人至少有一颗智齿先天缺失，对他们而言第二大臼齿即为该侧末端具功能的牙 [F20]。每一颗牙在你口腔里的角色，须由牙医师依你的咬合与缺牙状况评估。
第二大臼歯はほかの歯より重要なのですか。 — **本カードが調べた文献は歯に重要度の順位をつけていないので、本カードもそのような主張はしません [F22]。** 言えるのは検証可能な事実だけです。咬合力の分布は大臼歯部が小臼歯部・前歯部より大きい（小標本の測定）[F15]。臼歯部の咬合する対数が少ない人は咀嚼のパフォーマンスが 28% から 39% 低い [F16]。およそ 23.07% の人は親知らずが少なくとも 1 本先天欠如しており、その人にとって第二大臼歯はその側で機能する最後方の歯になる [F20]。あなたの口のなかで 1 本 1 本が果たしている役割は、歯科医師があなたの咬合と欠損の状態に照らして評価する必要があります。
Is the second molar more important than other teeth? — **The literature found for this card does not rank teeth by importance, so this card makes no such claim [F22].** What can be said are verifiable facts: occlusal force distribution is greatest at the molar region, ahead of the premolar and anterior regions (small-sample measurement) [F15]; people with fewer posterior occluding pairs showed chewing performance 28% to 39% lower [F16]; and about 23.07% of people have at least one congenitally absent wisdom tooth, for whom the second molar is the functional terminal tooth on that side [F20]. What role a given tooth plays in your mouth must be assessed by a dentist against your own occlusion and any missing teeth.

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km 編輯部・《臼齿是哪几颗？第二大臼齿为什么重要？｜證據鏈》・IDAEO 知識庫・2026-08-13・https://km.idaeo.ai/post/reports/dental-molar-anatomy-evidence

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更新 2026-08-13T14:17:27.384Z · server-rendered · four-language · IDAEO 知識庫