Nasal tip

Tip surgery is now a support problem rather than a sculpting problem: the septal extension graft holds projection and rotation where the columellar strut loses them (0.2% against 4.7% projection loss at one year), and the current series repair, reposition and reinforce the lower lateral cartilages instead of excising them. Large series report satisfaction of 85–90% with revision rates between 1.7% and 13%, but almost all of them are single-surgeon and retrospective, and only 27.3% of published tip-graft studies report what the patient thought.

200papers on file 40this page is written from 10journals, 2011–2026 38open access, full text 154with a plain-language summary

Where these 200 papers were published

60Plastic and Reconstructive SurgeryPlast Reconstr Surg
57Aesthetic Plastic SurgeryAesthetic Plast Surg
25Aesthetic Surgery JournalAesthet Surg J
24Facial Plastic SurgeryFacial Plast Surg
11JAMA Facial Plastic SurgeryJAMA Facial Plast Surg
9Plastic and Reconstructive Surgery Global OpenPlast Reconstr Surg Glob Open
8Facial Plastic Surgery and Aesthetic MedicineFacial Plast Surg Aesthet Med
3Archives of Facial Plastic SurgeryArch Facial Plast Surg
2Facial Plastic Surgery Clinics of North AmericaFacial Plast Surg Clin North Am
1Clinics in Plastic SurgeryClin Plast Surg

22011 102012 82013 162014 112015 122016 122017 82018 92019 132020 112021 102022 112023 142024 262025 272026

89 further papers on this topic came in through the history rather than the archive query: GOLDMAN IB 1957, ANDERSON JR 1962, Janeke JB 1971, Tardy ME Jr 1973 and 85 more. They are counted on the landmark papers, not here.

What repeats

Six findings reported by independent groups in different countries. Each card carries the papers it rests on.

Septal extension graft 0.2% projection loss, columellar strut 4.7%

Two structures are used to hold the tip: a strut floating between the medial crura, and a graft fixed to the septum that the tip is then set onto. Measured at one year in 77 primary open rhinoplasties by one surgeon, the strut lost 4.7% of projection against 0.2% for the septal extension graft, and 4.9 degrees of rotation against 1.3. The strut carried a 5.1-fold risk of losing more than 4% of projection and a 2.8-fold risk of losing five degrees or more of rotation. A meta-analysis of eight studies (256 strut, 371 extension graft patients) reaches the same direction from pooled data: long-term nasolabial angle favoured the extension graft, and Goode's ratio improved after the extension graft but not after the strut. The strut is not useless. It is a smaller intervention with a smaller and predictable loss.

Rests on: Bellamy and Rohrich, 77 primaries at one year · Ozgenc et al., meta-analysis of eight studies.

Combined septal extension and derotation grafts revised at 6.5%, either alone 10.6–14.3%

In 324 Asian short-nose corrections by one surgeon over seven years, three constructions were compared over more than twelve months: derotation graft with columellar strut, septal extension graft alone, and the two combined. The combination held nasal length and tip projection most consistently and revised least, 6.5%, against 10.6% for the extension graft alone and 14.3% for the derotation graft with a strut. A separate 729-patient comparison of the two grafts found projection gains equal but the failure modes different: the extension graft produced more tip-columella deviation (5.23% against 1.41%) and the derotation graft more tip drooping (8.45% against 4.53%) and more supratip deformity (2.82% against 0%). Both hold; they fail in opposite directions.

Rests on: Huang et al., 324 short-nose corrections · Namgoong et al., 729 tip-plasties.

The lateral crus is repositioned and reinforced, not excised

Every recent series that touches the lateral crus argues against removing it. An algorithm built on preservation and repositioning in 50 patients reported 90% aesthetic and functional improvement with 4% revision for minor asymmetry. A lateral crural strut graft used for post-implant tip deformities in 37 Asian secondary cases moved the Rhinoplasty Outcome Evaluation score from 30.41 to 75.90. Lateral crural repositioning with reconstruction in 42 revisions improved obstruction and cosmesis scores at both three and eleven months and improved lateral wall insufficiency at zone 1. The extended alar contour graft combines the lateral crural strut with the rim graft for the same purpose: hold the ala out and stop the tip standing in isolation.

Rests on: Tanvar and Basu, classification and algorithm in 50 patients · Kook et al., lateral crural strut in 37 secondary cases · Abdelhamid et al., repositioning in 42 revisions · Cochran and Sieber, extended alar contour graft.

Supratip fullness is a soft-tissue problem as much as a cartilage one

Three groups measured what happens to the supratip when the ligaments over it are handled differently, and all three found the soft tissue decisive. Repairing the Pitanguy ligament to the caudal septum in 120 open cases gave a significantly deeper supratip break at twelve months than either leaving it alone or excising it. An interalar ligament flap in 147 primary open cases lowered tip edema and supratip fullness and raised supratip definition at two, six and twelve months. In closed low-septal-resection preservation, transecting Pitanguy's midline ligament prevented supratip depression entirely (0 of 20 against 4 of 16) without causing pollybeak. Where fullness is already established, a graded classification, the Supratip Fullness Rating Scale, took 53 Asian corrections from 2.34 to 0.23.

Rests on: Şirinoğlu et al., Pitanguy repair in 120 patients · Marianetti et al., interalar ligament flap in 147 · Erdal and Genç, ligament transection in preservation · Wang et al., pollybeak classification.

Many tip grafts work; the evidence behind them is observational

A systematic review of a decade of tip grafting found 44 studies, 38 of them observational and six randomised, averaging 6.5 of 9 on the Newcastle-Ottawa scale and 2.5 of 5 on Jadad. Autologous, homologous and alloplastic grafts all produced satisfactory results, 86.4% of studies reported anthropometric measurements and only 27.3% reported anything the patient said. The individual series on file fit that description: 193 mastoid fascia camouflage cases with 3.1% revision, 45 X-shaped rib grafts holding position, 37 Y-shaped auricular struts raising the nasolabial angle, 66 bilateral conchal and septal frameworks graded excellent or good in 93.9%. The direction is consistent; the comparisons that would rank them do not exist.

Rests on: Skochdopole et al., 44 studies appraised · Tugertimur et al., mastoid fascia in 193 cases · Wu et al., X-shaped rib graft in 45 patients · Martino et al., Y-columellar strut in 37 · Wang et al., conchal and septal framework in 66.

The tip is planned against the upper lip, not only the nose

In 139 consecutive primary patients, 61% had inadequate incisor show and 5% excessive gum show before any operation, the lip position that tip surgery then moves. Tip overprojection predicted a long nose (odds ratio 3.03) and a hanging columella did too (2.97), while underprojection predicted a short nose (odds ratio 35). No nasal measurement predicted lip position, so it has to be examined separately. The published algorithm selects the tip construction from that examination: a short columella with poor incisor show gets extended spreader grafts and a strut tapered posteriorly; excessive gum show gets an untapered or wider strut fixed to the septum to push the lip down.

Rests on: Swanson et al., 139 primary patients · Guyuron et al., incisor-show algorithm.

By problem

What the 40 papers on file report for each presenting problem, and how far the follow-up runs.

The short or under-projected tip

The most crowded problem in this literature. The septal extension graft is the base construction; combining it with a derotation graft revised least in 324 Asian cases (6.5%), and every one of 30 primary rib-graft cases in a 638-case American practice also received an extension graft. Where rib is used, warping is the risk, and a circumferential split producing an X-shaped graft held the nasion-pronasale angle stable in 45 patients. Auricular cartilage covers the smaller gain: a Y-shaped strut from the antihelix raised the nasolabial angle in 37 patients, and bilateral conchal cartilage combined with septal cartilage produced excellent or good results in 93.9% of 66. A single-unit graft merging the extension graft and strut in 32 primaries needed no revisions at 13.4 months.

Key papers: Huang et al. · Novak et al., rib in 30 of 638 primaries · Wu et al., X-shaped tip graft · Martino et al., Y-columellar strut · Rosi-Schumacher and Sherris, combined graft in 32.

The overprojected tip

One large series covers it. Of 2,003 rhinoplasties in one American practice over eight years, 447 needed deprojection, done by resecting the medial crura, stealing from the lateral crura and adding a columellar strut. At a mean 22.4 months, 1.8% needed empiric antibiotics and 3.8% needed a revision operation. The closed-approach algorithm built on 19,643 Caucasian primaries treats the same problem by volume, projection and rotation assessment: 67% of that cohort needed tip-interrupting techniques, 88.7% declared full satisfaction and 12.3% needed a minor revision across a twenty-year follow-up.

Key papers: Datta et al., 447 deprojections · Scattolin et al., 19,643 closed primaries.

The bulbous tip and lateral crural deformity

Handled by repositioning and reinforcement rather than cephalic trim: a preservation-based algorithm in 50 patients (4% revision), lateral crural strut grafts in 37 Asian secondary cases, repositioning and reconstruction in 42 revisions, and the extended alar contour graft as a combined construction. For total reconstruction of a destroyed lower lateral cartilage, published two-dimensional templates from 40 cadaver cartilages give the shape to carve from a rib slice.

Key papers: Tanvar and Basu · Kook et al. · Abdelhamid et al. · Kiranantawat and Pakawatkul, cadaveric templates.

Supratip fullness and pollybeak

Prevention is ligament management. Repair the Pitanguy ligament in open structural cases, transect it in closed low-strip preservation, or raise an interalar ligament flap, and correction is graded first, then addressed by cause. The Supratip Fullness Rating Scale moved from 2.34 to 0.23 in 53 Asian corrections, with surgeon-rated appearance from 7.47 to 1.79 and 77.36% satisfaction on the Rhinoplasty Outcome Evaluation.

Key papers: Şirinoğlu et al. · Erdal and Genç · Marianetti et al. · Wang et al..

The alar base and nostrils

Four techniques, four series, all from the basal view that photography made prominent. A two-step sequential alar base resection in 423 primary and secondary patients reported no technique-specific complication. An alar base lining graft in 42 patients prevented and corrected alar retraction with no extrusion or collapse at a year or more. Auricular composite grafts from the antihelix corrected the alar-nostril ring in 45 multiply operated patients (no graft failed, including in ten with previous skin necrosis), taking obstruction and cosmesis scores from 88 to 35. Alar base depression is filled either with fascia (52 patients, grayscale depression index 0.720 to 0.583) or with cartilage: a systematic review of six studies and 165 patients found diced cartilage more malleable and better long-term, mass cartilage easier to place with less resorption.

Key papers: Pozzi et al., sequential alar base resection in 423 · Pozzi et al., alar base lining graft · Sazgar et al., composite grafts in 45 · Zhao et al., fascia in 52 · Xiang et al., diced against mass cartilage · Rohrich et al., systematic alar base approach.

The columella and the incision

The incision itself changes the result. A prospective 52-patient comparison found a V-shaped columella-labial incision with V-Y closure gave greater projection gain and columellar height than the mid-columellar incision with no difference in scar; in 91 multiply operated noses the same incision produced no dehiscence or vascular event despite existing mid-columellar scars. Suture choice does not matter: a meta-analysis of six studies and 435 patients found no difference in scar between absorbable and non-absorbable. Where necrosis does occur, the published prevention is avoiding closure tension, advancing the columellar base anteriorly and using a Silastic healing chamber.

Key papers: Sazgar et al., prospective incision comparison · Sazgar et al., 91 compromised noses · Kenny et al., suture meta-analysis · Toriumi, columellar necrosis.

The tip without surgery

One series, one technique, six months of follow-up: a four-point hyaluronic acid injection in 107 patients at a mean of 0.12 mL, rated excellent on the Global Aesthetic Improvement Scale in 90.65% at six months. That is a small volume producing a graded improvement over a short window, and it is the only non-surgical tip data on file.

Key paper: Betti et al., diamond injection technique.

The terms, defined

Every term the papers above use to mean something specific, in plain language.

Septal extension graft (SEG): a cartilage graft fixed to the caudal septum with the tip set onto it, so projection and rotation are held against healing forces. The construction with the least measured late loss. [36728586, 41990353]
Columellar strut graft (CSG): a cartilage batten placed between the medial crura. It floats rather than fixing to the septum, which is why it loses more projection and rotation over a year. [36728586, 40854551]
Anatomic columellar strut: a strut shaped and placed to follow the natural columellar contour rather than sit as a straight bar, described as an algorithmic alternative. [31675056]
Derotation graft (DRG): a graft that rotates the tip downward and lengthens a short nose. Compared with the extension graft it gives equal projection but more drooping and supratip fullness. [39965161, 41990353]
Lateral crural strut graft (LCSG): a cartilage strip placed under the lateral crus to straighten, stiffen and reposition it; used to rescue notching, pinching, retraction and external valve collapse after previous surgery. [40920505, 28953723]
Alar contour graft (rim graft): a thin cartilage strip along the nostril rim to support it. Combined with the lateral crural strut it becomes the extended alar contour graft. [28953723]
Lateral crural steal: moving the dome point laterally along the lateral crus to change projection and rotation without adding a graft; used with medial crural resection to deproject. [39212968]
Tripod concept: the model that treats the two lateral crura and the conjoined medial crura as three legs, so shortening or lengthening a leg rotates the tip. Current reviews state its limits rather than discard it. [35877943, 40996913]
Delivery and non-delivery approach: closed techniques. Non-delivery works on the cartilage in place through small incisions; delivery lifts the lower lateral cartilage out as a chondrocutaneous flap first. 22% and 78% of a 19,643-case series. [39187588]
Volume, projection, rotation (VPR) assessment: the qualitative examination that sorts a tip by those three axes before a technique is chosen. [39187588]
Pitanguy's midline ligament: the fibrous band running from the dorsum down between the domes. Repairing it to the caudal septum deepens the supratip break; transecting it in closed preservation prevents supratip depression. [40080607, 35908175]
Interalar ligament flap: the tissue between the alar cartilages, raised and repositioned to define the supratip and reduce tip edema instead of being discarded. [37749799]
Pollybeak (supratip deformity): fullness above the tip that convexes the profile. Graded here on the Supratip Fullness Rating Scale (SFRS), 0 to 3. [37798507]
Supratip break point: the slight dip between the dorsum and the tip. Its depth is what ligament repair changes. [40080607]
Tip-defining points: the paired highlights over the domes. With the supratip above and the columellar break below they form the diamond that describes an ideal tip. [28953723]
Goode's ratio and the Byrd method: two ways of measuring tip projection from a lateral photograph, used to compare techniques over time. [40854551, 39965161]
Nasolabial angle (NLA): the angle between the columella and the upper lip; the standard measure of tip rotation. [40854551, 36729933]
Backstay suture: a suture described to hold the tip against deviation. In 147 patients, deviation needing correction was 2.7%, below the pooled literature average. [41917227]
Mastoid fascia tissue graft (MFTG): fascia harvested behind the ear and laid over the tip to camouflage graft edges and contour irregularities, in place of soft cartilage. [39026388]
Auricular composite graft (ACG): skin and cartilage taken together from the antihelix, used to rebuild an alar-nostril ring destroyed by over-resection. [39676167]
ROE, NOSE, SCHNOS, GAIS: the validated questionnaires. ROE and SCHNOS-Cosmesis rate appearance, NOSE and SCHNOS-Obstruction rate breathing, GAIS grades change against a baseline photograph. A result reported without one of these is a surgeon's judgement, not a patient's. [37798507, 39187271, 37115534, 37267216]
Lateral wall insufficiency (LWI): a graded measure of how far the sidewall collapses on inspiration, scored by zone. [37115534]
Level of evidence: the rating each journal requires. Almost every series here is III or IV: retrospective, single-surgeon, no control arm. [39965161, 39212968]

The papers this rests on

The 40 papers everything above was written from. Every one links to its abstract, its authors and its DOI.

FPS
Comparative Outcomes of Septal Extension versus Columellar Strut Grafts for Nasal Tip Stabilization and Positioning in Rhinoplasty: A Systematic Review and Meta-analysis
Ozgenc I, Alzoubi D, Vankayalapati DK et al.

2026PMID 40854551Summary
FPS
Management of Lateral Crura Deformity in Functional and Aesthetic Rhinoplasty: Classification, Surgical Algorithm, and Outcome-Based Approach
Tanvar S, Basu R

2026PMID 42624495Summary
APS
Algorithm for the Treatment of Tip Malformation Combining a Clinical Qualitative Assessment and Specific Closed-Rhinoplasty Techniques Based on Retrospective Analysis of Pellegrini's Fellows 40 Years' Experience
Scattolin A, D'Ascanio L, Galzignato PF et al.

2025PMID 39187588Summary
APS
A New Classification of Pollybeak Deformity and Its Treatment in Asian Rhinoplasty
Wang X, Zhao H, Sun Y et al.

2024PMID 37798507Summary
APS
The Treatment of Alar Base Depression in Rhinoplasty with Diced Autologous Cartilage or Mass Cartilage: A Systematic Review
Xiang X, Wang X, Wang S

2024PMID 38609657Summary
FPSAM
Columellar Scar Following Open Rhinoplasty Using Absorbable Suture Versus Nonabsorbable Suture: A Meta-Analysis
Kenny H, Jonas RH, Oyer S

2023PMID 34516890Summary
PRS
Current Surgical Outcomes of Nasal Tip Grafts in Rhinoplasty: A Systematic Review
Skochdopole AJ, Bay CC, Grome L et al.

2023PMID 36723630Summary
PRS
Personal Evolution in Rhinoplasty Tip Shaping: Beyond the Tripod Concept
Rohrich RJ, Bellamy JL, Chamata ES et al.

2022PMID 35877943Summary
ASJ
Concept of Anatomic Columellar Strut Grafting in Rhinoplasty: An Algorithmic Approach
Santareno S, Taş S

2020PMID 31675056
PRS
Systematic Surgical Approach to Alar Base Surgery in Rhinoplasty
Rohrich RJ, Savetsky IL, Suszynski TM et al.

2020PMID 33234955Summary
PRS
Extended Alar Contour Grafts: An Evolution of the Lateral Crural Strut Graft Technique in Rhinoplasty
Cochran CS, Sieber DA

2017PMID 28953723Summary
ASJ
Efficacy of Combined Septal Extension and Derotation Grafts in Asian Rhinoplasty: A Quantitative Analysis of Tip Projection and Stability
Huang CJ, Tsai TY, Yen CI et al.

2026PMID 41990353Summary
APS
A New Technique in Rhinoplasty for Stabilizing the Nasal Tip: Backstay Suture
Caropreso CA, Hirotani PMM, Dias RPP et al.

2026PMID 41917227Summary
APS
A Prospective Comparison of Inverted V Mid-columellar and V-Shaped Columellar-Labial Incisions in Reconstructive Rhinoplasty
Sazgar AA, Aalizade A, Zeyfoalzam M et al.

2026PMID 41998166Summary
APS
Application and Efficacy Observation of Autologous Bilateral Auricular Cartilage Combined with Nasal Septal Cartilage in Nasal Tip Shaping During Rhinoplasty
Wang L, Li X, Li Z et al.

2026PMID 41857160Summary
APS
Autologous Fascial Grafting for Alar Base Depression: A Novel Technique in Asian Rhinoplasty
Zhao H, Wang X, Yang K et al.

2026PMID 41813990Summary
PRS
Superiority of the Septal Extension Graft over the Columellar Strut Graft in Primary Rhinoplasty: Improved Long-Term Tip Stability
Bellamy JL, Rohrich RJ

2023PMID 36728586Summary
PRS
A Comparative Study of Septal Extension Graft versus Derotation Graft for Short Nose Correction in Asian Rhinoplasty
Namgoong S, Yoon Y, Park S et al.

2025PMID 39965161Summary
FPSAM
Outcomes Following Rhinoplasty Using the Combined Septal Extension-Columellar Strut Graft
Rosi-Schumacher M, Sherris DA

2024PMID 39187271Summary
PRS
Nasal Tip Deprojection in Rhinoplasty
Datta S, Tugertimur B, Hanna SA et al.

2025PMID 39212968Summary
PRS
Mastoid Fascia Tissue Graft as a Tip Camouflage Technique in Rhinoplasty: A Reliable Alternative to Soft Cartilage Grafts
Tugertimur B, Datta S, Goote P et al.

2025PMID 39026388Summary
PRS
The Influence of the Pitanguy Ligament on the Supratip Break Point in Open Rhinoplasty
Şirinoğlu H, Güvercin E, Tatar BE et al.

2025PMID 40080607Summary
PRS
Use of the Interalar Ligament Flap for Tip and Supratip Contouring in Primary Open Structural Rhinoplasty
Marianetti TM, Segreto F, Iademarco A et al.

2024PMID 37749799Summary
ASJ
Transection of Pitanguy's Midline Ligament to Avoid Supratip Depression in Closed-Approach, Low-Septal-Resection Dorsal Preservation Rhinoplasty
Erdal AI, Genç İG

2023PMID 35908175Summary
PRS
Versatile Usability of Lateral Crural Strut Graft for Correction of Various Nasal Tip Deformities in Secondary Rhinoplasty in Asians
Kook WS, Kim K, Suh I et al.

2026PMID 40920505Summary
FPSAM
Patient Outcomes in Lateral Crural Repositioning and Reconstruction in Revision Rhinoplasty
Abdelhamid AS, Kimura KS, El Abany A et al.

2024PMID 37115534Summary
PRS
Y-Columellar Strut Graft: A Method for Reconstructing the Nasal Tip in Primary and Revision Rhinoplasty
Martino C, Salzano FA, Martino D et al.

2023PMID 36729933Summary
ASJ
X-shaped Tip Graft: A Versatile Solution for Warping Correction in Rib Cartilage-Based Rhinoplasty
Wu L, You J, Wang H et al.

2023PMID 35748855Summary
PRS
Role of Rib Graft for Tip Shaping in Primary Rhinoplasty: A Retrospective Case Series of 30 Patients
Novak M, Cason R, Rohrich RJ

2024PMID 37307054Summary
ASJ
The Incidence of Nasal Tip and Upper Lip Malposition in Primary Rhinoplasty
Swanson M, DeLeonibus A, Ku Y et al.

2024PMID 39012964Summary
ASJ
Incisor Show-based Selection of Tip Augmentation Rhinoplasty Technique
Guyuron B, Swanson M, DeLeonibus A

2024PMID 39042732Summary
PRS
Positioning the Nasal Tip in Rhinoplasty
Mattos D, Hanna SA, Datta S et al.

2025PMID 40996913Summary
PRS
Two-dimensional shape and dimensions of lower lateral alar cartilages (LLCs) for corrective rhinoplasty
Kiranantawat K, Pakawatkul T

2025PMID 41294316Summary
ASJ
Single-Stage Alar Nostril Ring Correction Using Auricular Composite Grafts in Reconstructive Rhinoplasty
Sazgar AA, Sazgar AK, Hatami N et al.

2025PMID 39676167Summary
PRS
Sequential Alar Base Resection in Primary and Secondary Rhinoplasty
Pozzi M, Susini P, Losco L et al.

2026PMID 42554673Summary
PRS
Alar Base Lining Graft: A New Technique to Prevent and Correct Alar Retraction in Primary and Secondary Rhinoplasty
Pozzi M, Susini P, Murante A et al.

2024PMID 38346139Summary
ASJ
Strategic Use of the V-Shaped Columella-Labial Incision for Reconstructive Rhinoplasty in Severely Compromised Noses
Sazgar AA, Sazgar MA, Zarei R et al.

2025PMID 40408098Summary
FPSAM
Prevention and Management of Columellar Necrosis in Rhinoplasty
Toriumi DM

2026PMID 42210784Summary
ASJ
Closed Preservation Rhinoplasty in the Mestizo Patient: Challenges and Techniques for Nasal Tip Support
Valdivia C, Durand PD, Çakir B

2025PMID 39876773Summary
FPSAM
Nonsurgical Rhinoplasty: Diamond Injection Technique for Nasal Tip Contouring
Betti E, Catarzi L, Consorti G

2024PMID 37267216Summary

What is still contested

The strut against the extension graft is not settled in practice. One series measured a 5.1-fold risk of projection loss with a strut; the meta-analysis found no difference in Goode's ratio between them; and a 44-year algorithm still selects a tapered strut over an extension graft when the patient's incisor show demands it. [36728586, 40854551, 39042732]
The extension graft and the derotation graft fail in opposite directions, deviation against drooping and supratip fullness, and no study on file predicts which patient gets which. [39965161]
Pitanguy's ligament is repaired in one operation and transected in another, both to protect the supratip. The two were tested in different approaches (open structural against closed low-strip preservation) and never head to head. [40080607, 35908175]
Tip-graft evidence is thin by design: 38 of 44 studies observational, mean Newcastle-Ottawa 6.5 of 9, and only 27.3% reporting a patient-reported outcome. [36723630]
Revision rates are quoted over incompatible windows, 1.7% at six to twelve months, 3.8% at 22 months, 12.3% across twenty years. A rate without its follow-up period is not comparable. [39876773, 39212968, 39187588]
Alar base depression has two accepted fillers with opposite advantages, and the systematic review that compared them covered six studies and 165 patients. [38609657]
The non-surgical tip rests on one 107-patient cohort followed to six months. [37267216]
Almost every series is one surgeon's own patients, reported retrospectively. The direction of the findings repeats across practices; the decimal places do not transfer.