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Table 1 Summarized data of the 10 studies included in the review

From: Coronectomy as a surgical approach to impacted mandibular third molars: a systematic review

Study Study design Sample size (n) Sex and age (range or mean or mean ± SD) Teeth (n) Adjunct pharmacological treatments Surgical success or failure [n(%)] IANI [n(%)] LNI [n(%)] Adverse effects [n(%)] Pulp disease [n(%)] Root migration [n(%)] and/or (mm and timepoint) Reoperation [n(%)] Follow-up (range or mean ± SD) Clinical implications
O’Riordan et al. [22] RS 52 31 yrs* 95 Antibiotics S: 87 (91.6%) t-IANI: 3 (3.4%) t-LNI: 1 (1.1%) I: 3 (3.4%) No NA 3 (3.4%) 24 months* Effective alternative to extraction
F: 8 (8.4%)
Progrel et al. [14] PCS 41 NA 50 Preoperative antibiotics S: 50 (100%) No t-LNI: 1 (2%) NA NA 15 (30%) 2–3 mm in 6 months 3 (6%) 22 months Effective alternative to extraction
F: 0 (0%)
Renton et al. [7] RCT 128 M 30; F 64 94 Preoperative Chlorhexidine mouth washes S: 58 (61.7%) No No P: 8 (13.8%) No 5 (13.2%) 2 mm in 12 months No 25 ± 13 months Low risk of complications than extraction
I: 3 (5.2%)
DSI: 7 (12%)
28.2 ± 5.9 yrs* F: 36 (38.3%) t-IANI: 3 (8%) No P: 4 (11.1%) / / /
DSI: 4 (11,1%)
Dolanmaz et al. [25] PCS 43 M 23; F 20 47 Antibiotics S: 46 (97.9%) p-IANI: 1 (2.2%) NA NA No 3.4 mm in 6 months No 9.3 months Effective alternative to extraction
18–38 yrs F: 1 (2.1%) 3.8 mm in 12 months
4 mm in 24 months
Hatano et al. [16] CCT 107* M 27; F 75 107* NA S: 102 (95,3%) t-IANI: 1 (1%) No P: 19 (18.6%) NA 87 (85.3%) 5 (4.9%) 13.5 ± 14.8 months Low risk of complications than extraction
32.4 ± 10.4 yrs F: 0 (0%)* DSI: 2 (2%)
I: 1 (1%)
Leung and Cheung [17] RCT 171 M 70; F 101 171 Paracetamol and codein for 3 days S: 155 (90.6%) t-IANI: 1 (0.6%) No P: 65 (41.9%) No 96 (62.2%) 1.9 mm in 3 months 1 (0.6%) 10.6 ± 7.7 months Low risk of complications than extraction
I: 9 (5.8%) 36 (23.6%) 3 mm in 6 months
3 (2%) 3.1 mm in 24 months*
27.2 ± 7.3 yrs F: 16 (9.4%) t-IANI: 1 (6.2%) No NA / / / 11.4 ± 7.9 months
Cilasun et al. [24] CCT 88 27.2 yrs 88 Antibiotics Benzydamine HCL plus Chlorhexidine gluconate for 5 days S: 86 (97.7%) No NA P: 1 (1.1%) No NA 1 (1.2%) 17 months Effective alternative to extraction
I: 1 (1.1%)
F: 2 (2.3%) No NA No / / /
Goto et al. [61] PCS 101 M 79; F 37 116 NA S: 116 (100%) No No DSI: 7 (6%) 1 (0.9%) 3 mm in 12 months 8 (6.9%) 12 months Safety technique in 12 months
33 yrs* F: 0 (0%)
Monaco et al. [59] PCS 37 M 17; F 20 43 Antibiotics for 4 days Chlorhexidine for 10 days Ibuprofen S: 43 (100%) No No P: 1 (2%) NA 1.6 mm in 3 months 1 (2.3%) 12 months Effective alternative to extraction
31 ± 2 yrs F: 0 (0%) SW: 2 (4.6%) 2 mm in 6 months
DSI: 1 (2%) 2 mm in 12 months
Patel et al. [60] RS 21 M 10; F 11 21 Antibiotics S: 20 (95.2%) t-IANI: 2 (9.5%) NA I: 2 (9.5%) NA 9 (43%) 1 (5%) 2-40 months Effective alternative to extraction
41.3 yrs F: 0 (0%) p-IANI: 1 (4.8%) DSI: 1 (4.8%)
  1. CCT: controlled clinical trial; DSI: dry socket infection; F: female (in age and sex column) or failed coronectomy (in surgical success or failure column); I: infection rate; p-IANI: permanent inferior alveolar nerve injury; t-IANI: transient inferior alveolar nerve injury; p-LNI: permanent lingual nerve injury; t-LNI: transient lingual nerve injury; M: male; NA: not available; P: pain; PCS: prospective cohort study; RCT: randomized clinical trial; RS: retrospective study; S: success coronectomy; SW: swelling; SD: standard deviation; /: not applicable; *: value derived from graphs or text of the study.