臼歯を抜いた後、補わなくてもよいですか?何が起こりますか?|證據鏈
本頁是〈臼歯を抜いた後、補わなくてもよいですか?何が起こりますか?〉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。
臼歯を抜いた後、補わなくてもよいですか?何が起こりますか?|證據鏈
F-Units(事実単位台帳)
- F1|confidence: verified|basis: peer_reviewed(PMID 17559530)|period: 2007 年刊行|geo: universal|span: 「The mean supraeruption for subjects was 1.68 mm (SD 0.79, range 0 to 3.99 mm) and for controls, 0.24 mm (SD 0.39, range 0 to 1.46 mm)」「Supraeruption was found in 92% of subjects' unopposed teeth」「The extent of supraeruption was statistically greater in maxillary unopposed teeth than in mandibular unopposed teeth」|caveat: 100 例と 100 対照の診断モデル研究。地域調査ではなく受診者集団
- F2|confidence: verified|basis: peer_reviewed(PMID 17672834)|period: 2007 年刊行|geo: universal|span: 「A statistical significance in the degree of tipping of teeth both mesial and distal to the extraction site was detected between the subject and control groups」「Teeth mesial to the extraction site had a tendency to tip distally」|caveat: 同系列第 2 部、同一の 100+100 標本
- F3|confidence: verified|basis: peer_reviewed(PMID 17927736)|period: 2008 年刊行|geo: universal|span: 「Unopposed posterior teeth are more likely to be involved in RCP contacts or interferences than their matched controls」「Initial RCP contacts have associations with the extent of supraeruption of the unopposed teeth」「Working side interferences were associated with tipping of the tooth mesial to the extraction site」|caveat: 同系列第 3 部
- F4|confidence: verified|basis: peer_reviewed(PMID 21902708)|period: 12 年追跡、2012 年刊行|geo: universal|span: 「unopposed molars showed 4·9 times higher risk of overeruption of ≥2 mm (95% CI 1·5-15·3)」「The average overeruption for the unopposed molars was 4·5% (s.d. 7·6), which corresponds to approximately 0·9 mm」「The average mesial tipping was 0·8° (s.d. 5·6)」「Molars facing a mesial edentulous space showed a low risk for mesial tipping」|caveat: 女性 292 人の前向き研究。全員女性の標本
- F5|confidence: verified|basis: peer_reviewed(PMID 17371561)|period: 2007 年刊行|geo: universal|span: 「Partial tooth contact does not appear to prevent or reduce overeruption」「partial tooth contact should not be relied on clinically to maintain vertical tooth position」|caveat: 患者 91 人の臨床研究
- F6|confidence: verified|basis: peer_reviewed(PMID 16671988)|period: 2006 年刊行|geo: universal|span: 「when a posterior tooth has remained unopposed for 5 years or more positional changes, which cause deviation from the Broadrick curve, occur」「The extent of the deviation may be extreme, potentially leading to difficulties in restoring a harmonious occlusal scheme」|caveat: 咬合曲線の技術研究であり、患者結果研究ではない
- F7|confidence: verified|basis: peer_reviewed(PMID 17002745、文献レビュー)|period: 1966 年から 2005-11 まで検索、2006 年刊行|geo: universal|span: 「no clinically significant differences between subjects with shortened dental arches of three to five occlusal units and complete dental arches regarding variables such as masticatory ability, signs and symptoms of temporomandibular disorders, migration of remaining teeth, periodontal support, and oral comfort」「No systematic clinical study with conflicting results was found」|caveat: ナラティブレビュー(メタ解析ではない)。主に単一研究グループの作品を採用
- F8|confidence: verified|basis: peer_reviewed(PMID 29476794、システマティックレビュー)|period: PROSPERO CRD42017064851、2018 年刊行|geo: universal|span: 「there is currently insufficient evidence to recommend one tooth replacement strategy over another in adult patients with reduced dentitions」|caveat: 10 論文を採用。著者はランダム化比較試験が不足すると明記
- F9|confidence: verified|basis: peer_reviewed(PMID 28370239、システマティックレビューとメタ解析)|period: 1980 年から 2016-11 まで検索、2017 年刊行|geo: universal|span: 「There was no statistically significant difference in OHIP summary scores between SDA and RPDP at 6 (SWMD = 0·24) or 12 (SWMD = 0·40) months post-treatment」「516 participants」|caveat: RCT 2 件と非 RCT 1 件のみ。短期(12 か月)結果
- F10|confidence: verified|basis: peer_reviewed(PMID 24992473、システマティックレビュー)|period: 2014 年刊行|geo: universal|span: 「The shortened dental arch as a treatment option is encouraging in terms of functioning, patient satisfaction and cost-effectiveness」「some of the included studies had to be downgraded due to methodological errors」|caveat: ナラティブ統合。メタ解析は未実施
- F11|confidence: verified|basis: peer_reviewed(PMID 37001792、システマティックレビュー)|period: 2022-11-06 まで検索、2023 年刊行|geo: universal|span: 「No significant difference was recorded in the nutritional status of patients rehabilitated using the SDA concept compared with RPDs」「Higher costs for treatment provision and maintenance for patients in the RPD group was found when compared to SDA treatment」|caveat: 2 件の RCT から 4 報のみでメタ解析不能。費用結論はどの地域の価格にも換算できない
- F12|confidence: verified|basis: peer_reviewed(PMID 22733244、多施設 RCT 5 年)|period: 2013 年刊行|geo: universal|span: 「the Kaplan-Meier survival rates at 5 years were 0.74 (95% CI 0.64, 0.84) in the PRDP group and 0.74 (95% CI 0.63, 0.85) in the SDA group」「For tooth loss in the study jaw, the survival rates at 5 years were 0.88 … and 0.84 …. The differences were not significant」|caveat: 152 人が治療を受け、132 人が 5 年追跡に到達。ドイツの多施設研究
- F13|confidence: verified|basis: peer_reviewed(PMID 29316570、同一 RCT 10 年)|period: 2018 年刊行|geo: universal|span: 「the survival rates for tooth loss at 10 years were 0.44 (95% confidence interval [CI]: 0.30 to 0.56) in the PRDP group and 0.52 (95% CI: 0.37 to 0.65) in the SDA group」「The number of teeth lost was higher than expected」「The results suggest an overestimation of the influence of the prosthetic management of the bilateral SDA」「For tooth loss in the study arch, the survival rates were 0.67 (95% CI: 0.52 to 0.78) in the PRDP group and 0.60 (95% CI: 0.45 to 0.73) in the SDA group.」|caveat: 152 人中 82 人が 10 年診察に到達。脱落率が高い
- F14|confidence: verified|basis: peer_reviewed(PMID 26066662、システマティックレビュー)|period: 2003 年から 2014 年まで検索、2015 年刊行|geo: universal|span: 「Subjects with (E)SDA had a 30-40% reduced masticatory performance」「Comminution or mixing ability in subjects with (E)SDA was 28-39% lower compared to that of subjects with complete dentitions」「distal-extension RDPs could compensate this reduction partially (some 50%)」「more artificial teeth in RDPs resulted in better performance」|caveat: SDA=後方咬合対 3 から 5、ESDA=0 から 2。採用研究は少数
- F15|confidence: verified|basis: peer_reviewed(PMID 34761421、システマティックレビュー)|period: 1966 年から 2020 年まで検索、2022 年刊行|geo: universal|span: 「Two retrospective studies indicated that RDPs increased the risk of tooth loss compared to FDPs in patients with a history of periodontitis」「Several studies indicated that RDP increased plaque accumulation」「There is no strong evidence that RDPs per se will cause periodontal destruction including tooth loss」|caveat: データは異質でメタ解析なし。対象は歯周炎患者に限定
- F16|confidence: verified|basis: peer_reviewed(PMID 23062124、システマティックレビューとメタ解析)|period: 2006 年から 2011 年まで検索、2012 年刊行|geo: universal|span: 「Based on the meta-analysis, survival of implants supporting SCs at 5 years amounted to 97.2% (95% CI: 96.3-97.9%), and at 10 years amounted to 95.2% (95% CI: 91.8-97.2%).」「The survival of implant-supported SCs was 96.3% (95% CI: 94.2-97.6%) after 5 years and 89.4% (95% CI: 82.8-93.6%) after 10 years.」「8.8% (95% CI: 5.1-15.0%) for screw-loosening, 4.1% (95% CI: 2.2-7.5%) for loss of retention, and 3.5% (95% CI: 2.4-5.2%) for fracture of the veneering material」「technical, biological, and aesthetic complications were frequent」「For biological complications, a 5-year cumulative soft tissue complication rate of 7.1% (95% CI: 4.4-11.3%) and a cumulative complication rate for implants with bone loss >2 mm of 5.2% (95% CI: 3.1-8.6%) were calculated.」「Based on the meta-analysis, survival of implants supporting SCs at 5 years amounted to 97.2% (95% CI: 96.3-97.9%), and at 10 years amounted to 95.2% (95% CI: 91.8-97.2%).」|caveat: 46 研究を採用。生存率は成功率ではなく、個人の予測値でもない
- F17|confidence: verified|basis: peer_reviewed(PMID 25935732、システマティックレビューとメタ解析)|period: 2006 年から 2013 年まで検索、2015 年刊行|geo: universal|span: 「an estimated 5-year survival rate of metal-ceramic FDPs of 94.4% (95% CI: 91.2-96.5%)」「densely sintered zirconia FDPs was 90.4%」「A significantly higher incidence of caries in abutment teeth was observed for densely sintered zirconia FDPs compared to metal-ceramic FDPs」「framework fractures … reinforced glass ceramic FDPs (8.0%) and glass-infiltrated alumina FDPs (12.9%) compared to metal-ceramic FDPs (0.6%) and densely sintered zirconia FDPs (1.9%)」「The estimated survival rate of reinforced glass ceramic FDPs was 89.1% (95% CI: 80.4-94.0%), the survival rate of glass-infiltrated alumina FDPs was 86.2% (95% CI: 69.3-94.2%) and the survival rate of densely sintered zirconia FDPs was 90.4% (95% CI: 84.8-94.0%) in 5 years of function.」|caveat: 複数ユニット固定性補綴物。材料差が大きい
- F18|confidence: verified|basis: peer_reviewed(PMID 23062127、システマティックレビュー)|period: 2012 年刊行|geo: universal|span: 「Initial costs for single implant crowns and FDPs on teeth were similar, but varied between tariff systems」「Failure rates reported with single implant crowns and FDPs on teeth were similar」「The utility for the patient to keep healthy adjacent teeth unprepared makes the implant crown more economic」|caveat: 経済面のレビュー。費用制度は国により異なり、本カードは金額を引用しない
- F19|confidence: verified|basis: peer_reviewed(PMID 35258700、システマティックレビューとメタ解析)|period: 2022 年刊行|geo: universal|span: 「The meta-analytic study of overall survival included a total of 14 studies, yielding an overall survival rate of 97.9%」「the 5- and 10-year survival rates were 95.9% and 96.9%」|caveat: 根の発育が未完了の移植歯に限定。根尖閉鎖歯には適用しない
- F20|confidence: verified|basis: peer_reviewed(PMID 25903060、システマティックレビューとメタ解析)|period: 2015 年刊行|geo: universal|span: 「Teeth with open apex were less likely to be extracted in comparison to teeth with closed apex (3 studies; 413 teeth; relative risk 0.3; 95% confidence interval 0.2-0.6)」「Reported complications included the need for extraction, failure, hypermobility, pulp necrosis, pulp obliteration, and root resorption」「no firm conclusions can be drawn」|caveat: 研究数の少なさ、方法論上の制約、異質性のため確定的結論は出せないと著者が明記
- F21|confidence: verified|basis: peer_reviewed(PMID 36898857、アンブレラレビュー)|period: 2022-09-25 まで検索、2023 年刊行|geo: universal|span: 「Seventeen SRs met the inclusion criteria」「The 5-year and 10-year survival rates were >95%」「Five SRs were rated as 'low quality' and 12 SRs were rated as 'critically low quality' in the AMSTAR 2 RoB assessment」|caveat: 採用レビューの品質評価は低い。数値は慎重に解釈する必要がある
- F22|confidence: verified|basis: peer_reviewed(PMID 26696138、システマティックレビューとメタ解析)|period: 6 年以上追跡の研究、2016 年刊行|geo: universal|span: 「Survival rates ranged from 75.3% to 91% and the meta-analysis showed an effect size of 81%」「The percentage ankylosis ranged from 4.2% to 18.2% and the effect size was 4.8%」「Root resorption percentages ranged from 3% to 10% and the effect size was equal to 4%」|caveat: 採用は 6 研究のみ。長期数値は短期研究より低く、本カードは一方を選ばず両方を併記
- F23|confidence: verified|basis: peer_reviewed(PMID 16527628、後ろ向き研究)|period: 2006 年刊行|geo: universal|span: 「The subjects were 48 patients who had 128 permanent second molars extracted during or before orthodontic treatment. Their ages at extraction were 11 to 23 years」「The median time of eruption was 3 to 4 years」「A total of 96.2% of the maxillary and 66.2% of the mandibular third molars erupted in good positions」「Unsuccessful third-molar eruptions occurred in older patients who had higher Nolla developmental stages」|caveat: 対象は矯正治療中の青年・若年成人に限定。一般成人には適用できない
- F24|confidence: verified|basis: peer_reviewed(PMID 22211303、システマティックレビュー)|period: 2012 年刊行、20 論文を採用|geo: universal|span: 「horizontal dimensional reduction (3.79 ± 0.23 mm) was more than vertical reduction (1.24 ± 0.11 mm on buccal, 0.84 ± 0.62 mm on mesial and 0.80 ± 0.71 mm on distal sites) at 6 months」「Percentage vertical dimensional change was 11-22% at 6 months. Percentage horizontal dimensional change was 32% at 3 months, and 29-63% at 6-7 months」「Soft tissue changes demonstrated 0.4-0.5 mm gain of thickness at 6 months」|caveat: 無処置で自然治癒した抜歯窩に限定。当サイト #28 カードと同じ族のアンカー
- F25|confidence: verified(2026-08-05 に HTTP 200 と逐語一致を実測。同 #9 カードの C2、#28 カードの F16 と同じアンカー)|basis: law|period: 現行条文|geo: TW|span: 《全民健康保險法》第 51 條「下列項目不列入本保險給付範圍:……十一、義齒、義眼、眼鏡、助聽器、輪椅、拐杖及其他非具積極治療性之裝具。」|caveat: 個別の給付は全民健康保険署の現行公告による。本カードは給付判定をしない
- F26|confidence: verified(2026-08-05 に HTTP 200 と逐語一致を実測)|basis: law|period: 現行条文|geo: TW|span: 《醫療法》第 81 條「醫療機構診治病人時,應向病人或其法定代理人、配偶、親屬或關係人告知其病情、治療方針、處置、用藥、預後情形及可能之不良反應。」|caveat: 台湾医療法の条文引用であり、法律意見ではない
- F27|confidence: verified(2026-08-05 に HTTP 200 を実測)|basis: official_statement|period: データセットの現況|geo: TW|span: 政府資料開放平臺資料集「臺北市醫療收費標準」,提供機關臺北市政府衛生局|caveat: 一県市の例。他県市ページは公開前に個別再検証が必要。同 #9 カード C3 のアンカー族
- F28|confidence: verified(入口にアクセス可能、2026-08-05 に HTTP 200 を実測)|basis: official_statement|period: 入口の現況|geo: TW|span: 健保署醫材比價網入口 info.nhi.gov.tw/INAE2000/INAE2010S01|caveat: ページ内容は JS で動的読込のため curl で逐語照合できない。欠損歯再建関連品目が検索対象かは公開前に実測が必要(#9 カード C4 の未検証残項と同じ)。2026-08-05 の OP 実測訂正:同サイトには歯科品目がなく、欠損歯再建関連項目はここで確認できない
- F29|confidence: verified|basis: internal_data|period: 2025-03 から 2026-08 の GSC|geo: TW|span: backlog #34「第二大臼齒拔掉不補」等 7 詞項合計曝光 107,506,跨 4 站|caveat: 曝光は資産レベルの数値で、重複排除済みトラフィックではない。掲載医院はキュー画面 #34 欄に従い、追加・削除禁止
- F30|confidence: 構造的な編集整理(外部事実の主張ではない)|basis: editorial_framework|period: 2026-08-05|geo: universal|span: 「三個問題的拆解」與「短牙弓適用/不適用條件對照」為本站依 F1 至 F24 文獻整理的溝通用架構|caveat: 臨床基準・診断ツールではなく、歯科医師の評価に代わらない
出典一覧
取得日はすべて 2026-08-05。PubMed 項目は E-utilities efetch で抄録原文を取得して逐語照合し、各項目ページの HTTP 200 応答を個別に実測しました。
- Craddock HL, Youngson CC. Occlusal changes following posterior tooth loss in adults. Part 1. J Prosthodont. 2007. PMID 17559530
- Craddock HL, et al. Occlusal changes following posterior tooth loss in adults. Part 2. J Prosthodont. 2007. PMID 17672834
- Craddock HL, et al. Occlusal changes following posterior tooth loss in adults. Part 3. J Prosthodont. 2008. PMID 17927736
- Christou P, Kiliaridis S, et al. Changes in molar position associated with missing opposed and/or adjacent tooth: a 12-year study in women. J Oral Rehabil. 2012. PMID 21902708
- Craddock HL. An investigation of overeruption of posterior teeth with partial occlusal contact. J Oral Rehabil. 2007. PMID 17371561
- Craddock HL, et al. Deviation from the Broadrick occlusal curve following posterior tooth loss. J Oral Rehabil. 2006. PMID 16671988
- Kanno T, Carlsson GE. A review of the shortened dental arch concept focusing on the work by the Käyser/Nijmegen group. J Oral Rehabil. 2006. PMID 17002745
- McKenna G, et al. Effectiveness of prosthodontic interventions and survival of remaining teeth in adult patients with shortened dental arches — A systematic review. J Dent. 2018. PMID 29476794
- Reissmann DR, et al. Shortened dental arch and prosthetic effect on oral health-related quality of life: a systematic review and meta-analysis. J Oral Rehabil. 2017. PMID 28370239
- Khan SB, et al. Differences in functional outcomes for adult patients with prosthodontically-treated and -untreated shortened dental arches: a systematic review. PLoS One. 2014. PMID 24992473
- Impact of shortened dental arch therapy on nutritional status and treatment costs in older adults: A systematic review. J Dent. 2023. PMID 37001792
- Walter MH, et al. The randomized shortened dental arch study: tooth loss over five years. Clin Oral Investig. 2013. PMID 22733244
- Walter MH, et al. The Randomized Shortened Dental Arch Study: Tooth Loss Over 10 Years. Int J Prosthodont. 2018. PMID 29316570
- Effects of removable dental prostheses on masticatory performance of subjects with shortened dental arches: A systematic review. J Dent. 2015. PMID 26066662
- Efficacy and risks of removable partial prosthesis in periodontitis patients: A systematic review. J Clin Periodontol. 2022. PMID 34761421
- Jung RE, et al. Systematic review of the survival rate and the incidence of biological, technical, and aesthetic complications of single crowns on implants reported in longitudinal studies with a mean follow-up of 5 years. Clin Oral Implants Res. 2012. PMID 23062124
- Sailer I, et al. All-ceramic or metal-ceramic tooth-supported fixed dental prostheses (FDPs)? Part II: Multiple-unit FDPs. Dent Mater. 2015. PMID 25935732
- Brägger U, et al. Implants versus short-span fixed bridges: survival, complications, patients' benefits. A systematic review on economic aspects. Clin Oral Implants Res. 2012. PMID 23062127
- Autotransplantation of teeth with incomplete root formation: systematic review and meta-analysis. Clin Oral Investig. 2022. PMID 35258700
- Machado LA, et al. Autotransplantation of teeth in humans: a systematic review and meta-analysis. Clin Oral Investig. 2015. PMID 25903060
- Tooth autotransplantation: An umbrella review. Dent Traumatol. 2023. PMID 36898857
- Almpani K, et al. Long-term prognosis of tooth autotransplantation: a systematic review and meta-analysis. Int J Oral Maxillofac Surg. 2016. PMID 26696138
- Spontaneous third-molar eruption after second-molar extraction in orthodontic patients. Am J Orthod Dentofacial Orthop. 2006. PMID 16527628
- Tan WL, et al. A systematic review of post-extractional alveolar hard and soft tissue dimensional changes in humans. Clin Oral Implants Res. 2012. PMID 22211303
- 台湾全民健康保険法 第 51 条(中華民国〔台湾〕法規データベース)
- 台湾医療法 第 81 条(中文正文。日本語訳は本サイト仮訳・中文正文為準)
- 政府オープンデータ・プラットフォーム:台北市医療費基準(提供機関:台北市政府衛生局)
- 衛生福利部中央健康保険署 医材比価網(入口)
- 内部データ:`analysis/reports/km-dental-backlog.md` #34 付録(語句×サイト×曝光を行ごとに照合可能)
- 編集フレームワーク:当サイトの「三つの問い」分解と短縮歯列弓の適用条件対照(外部出典なし、構造的整理と表示)
内部リンク
- 抜歯後の歯槽骨変化と骨造成処置:骨補填材に後遺症はある?失敗するとどうなる?(KM-DENTAL-28)
- 費用の聞き方と見積書の読み方:インプラント 1 本はいったいいくら?(KM-DENTAL-09)
- 「歯のかぶせ物」の名称分岐(矯正装置と補綴冠は異なる):「歯のかぶせ物」はいくら?(KM-DENTAL-08)
公開ゲートの注意:本カードは draft です。四言語(zh-Hans/en/ja)が揃うまで km_entries に入れてはいけません。F28 の欠損歯再建関連品目の収載範囲が実測されるまで、この文は「確認先」の位置づけを保ち、価格の記述に書き換えてはいけません。
FAQ
- 第二大臼歯を抜いて補わなくても、本当に大丈夫ですか?
- **補わずに機能を保てるという文献上の議論はありますが、条件付きです。** SDA 文献の場面は、三から五の咬合単位があり、前歯と小臼歯の咬合が保たれた人です。咀嚼能力、顎関節症状、残存歯の移動、歯周支持には一般に臨床的有意差がないとされます [F7]。一方、研究対象の対合歯のない歯の 92% に挺出があり(量の個人差は大きい)[F1]、残る咬合対が少ないほど咀嚼能率の低下は大きくなります [F14]。大丈夫かは残る咬合状態によるため、歯科医師の評価が必要です。
- 第二大臼歯を抜いて補わなくても、本当に大丈夫ですか? — **補わずに機能を保てるという文献上の議論はありますが、条件付きです。** SDA 文献の場面は、三から五の咬合単位があり、前歯と小臼歯の咬合が保たれた人です。咀嚼能力、顎関節症状、残存歯の移動、歯周支持には一般に臨床的有意差がないとされます [F7]。一方、研究対象の対合歯のない歯の 92% に挺出があり(量の個人差は大きい)[F1]、残る咬合対が少ないほど咀嚼能率の低下は大きくなります [F14]。大丈夫かは残る咬合状態によるため、歯科医師の評価が必要です。
- Is it really okay not to replace an extracted second molar? — **The literature does discuss maintaining function without replacement, but only under conditions.** SDA literature concerns people with three to five occlusal units and intact anterior and premolar occlusion; it generally found no clinically significant difference in masticatory ability, temporomandibular symptoms, migration of remaining teeth, or periodontal support [F7]. At the same time, 92% of unopposed teeth in the study population showed overeruption (with large individual variation in amount) [F1], and masticatory performance declines more as fewer occlusal pairs remain [F14]. Whether it is “okay” depends on your remaining occlusion and requires a dentist’s assessment.
- 補わないと、いつから歯が動きますか?
- **文献に「何か月後から」という共通の時点はありませんが、複数の時間尺度があります。** 12 年研究は長期の蓄積を記録し、対合歯のない大臼歯で 2 mm 以上の挺出リスクは 4.9 倍、平均は約 0.9 mm でした [F4]。別研究では後方歯に 5 年以上対合歯がないと咬合曲線の位置逸脱が記録されました [F6]。歯槽骨の変化は抜歯後 6 か月以内にも測定可能で、水平減少は 3.79 ± 0.23 mm でした [F24]。個人差は大きいです。
- 補わないと、いつから歯が動きますか? — **文献に「何か月後から」という共通の時点はありませんが、複数の時間尺度があります。** 12 年研究は長期の蓄積を記録し、対合歯のない大臼歯で 2 mm 以上の挺出リスクは 4.9 倍、平均は約 0.9 mm でした [F4]。別研究では後方歯に 5 年以上対合歯がないと咬合曲線の位置逸脱が記録されました [F6]。歯槽骨の変化は抜歯後 6 か月以内にも測定可能で、水平減少は 3.79 ± 0.23 mm でした [F24]。個人差は大きいです。
- If I do not replace it, when will teeth start to shift? — **The literature does not give one universal point such as “after a certain number of months,” but it provides several time frames.** The 12-year study records long-term accumulation: unopposed molars had 4.9 times the risk of overeruption of 2 mm or more and a mean of approximately 0.9 mm [F4]. Another study recorded deviation in the occlusal curve after a posterior tooth had been unopposed for 5 years or more [F6]. Alveolar-bone changes can be measured within 6 months after extraction (horizontal reduction 3.79 ± 0.23 mm) [F24]. Individual rates vary greatly.
- 親知らずで抜いた臼歯を置き換えられますか?
- **文献には二つの道がありますが、どちらも条件は厳格です。** 青年矯正患者で第二大臼歯を抜いた後、第三大臼歯が良好な位置へ自然萌出した割合は上顎 96.2%、下顎 66.2%、萌出期間中央値は 3 から 4 年で、年齢が高いほど成功は少なくなりました [F23]。自家歯牙移植では根尖未閉鎖歯の統合生存率は 97.9%(10 年 96.9%)[F19] ですが、6 年以上追跡したメタ解析では 75.3% から 91%(効果量 81%)、癒着 4.8%、歯根吸収 4% とされ、根尖閉鎖歯は抜去リスクが高いです [F20][F22]。可能性は歯科医師が画像で評価します。
- 親知らずで抜いた臼歯を置き換えられますか? — **文献には二つの道がありますが、どちらも条件は厳格です。** 青年矯正患者で第二大臼歯を抜いた後、第三大臼歯が良好な位置へ自然萌出した割合は上顎 96.2%、下顎 66.2%、萌出期間中央値は 3 から 4 年で、年齢が高いほど成功は少なくなりました [F23]。自家歯牙移植では根尖未閉鎖歯の統合生存率は 97.9%(10 年 96.9%)[F19] ですが、6 年以上追跡したメタ解析では 75.3% から 91%(効果量 81%)、癒着 4.8%、歯根吸収 4% とされ、根尖閉鎖歯は抜去リスクが高いです [F20][F22]。可能性は歯科医師が画像で評価します。
- Can a wisdom tooth replace an extracted molar? — **The literature describes two routes, but both have strict conditions.** After second-molar extraction in adolescent orthodontic patients, 96.2% of maxillary and 66.2% of mandibular third molars erupted into a good position, with a median eruption time of 3 to 4 years; success was lower with older age [F23]. For tooth autotransplantation, pooled survival with open apices was 97.9% (96.9% at 10 years) [F19], but a meta-analysis with follow-up of 6 years or more reported survival of 75.3% to 91% (effect size 81%), with ankylosis 4.8% and root resorption 4%; closed-apex teeth had a greater risk of extraction [F20][F22]. Feasibility requires imaging assessment by a dentist.
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km 編輯部・《臼歯を抜いた後、補わなくてもよいですか?何が起こりますか?|證據鏈》・IDAEO 知識庫・2026-08-13・https://km.idaeo.ai/reports/dental-molar-extraction-no-replacement-evidence