Intraoral sialolithotomy is a surgical technique for removing salivary gland stones through the mouth, avoiding an external skin incision and, in most cases, preserving the gland itself. It has become the preferred approach for stones lodged in the duct or near the junction where the duct meets the gland, replacing the older default of removing the entire gland along with the stone. The procedure can be performed under local or general anesthesia, and the shift toward it over the past two decades has meant that more than 70 percent of salivary stones can now be retrieved while keeping the gland functional.1PubMed. A revolution in the management of obstructive salivary gland disease
Where Salivary Stones Form and Why Location Dictates Treatment
Salivary stones, called sialoliths, are hard deposits made mostly of calcium and phosphate minerals. In one analysis, carbonate apatite appeared in 99 percent of stones, with calcium and phosphate each present in the high 80s as a percentage.2PubMed Central. Biochemical composition of salivary stones in relation to stone- and patient-related factors They typically form in layers, somewhat like a pearl, with alternating bands of mineral and organic matter around a core.3Clinica Chimica Acta. Sialolithiasis: mechanism of calculi formation and etiologic factors
The submandibular gland is the site for roughly 84 percent of all salivary stones, with the parotid gland accounting for about 13 percent. Within the submandibular system, 90 percent of stones sit in the duct (Wharton’s duct) rather than inside the gland tissue itself, whereas parotid stones tend to lodge within the gland more often.4British Dental Journal. Salivary stones: symptoms, aetiology, biochemical composition and treatment This anatomical pattern is the reason intraoral sialolithotomy works so well for submandibular stones: when a stone is sitting in a duct that runs along the floor of the mouth, a surgeon can reach it through the mouth without cutting through skin, muscle, or the facial nerve territory that an external approach would traverse.
What Salivary Stones Feel Like
The hallmark symptom is swelling of the affected gland, reported by about half of patients in a large series of nearly 3,000 cases. Another 40 percent described painful swelling, and a smaller group reported pain alone.5PubMed. Nearly 3,000 salivary stones: some clinical and epidemiologic aspects What makes salivary stones distinctive is the timing: symptoms flare up around meals, when the gland tries to release saliva but the stone blocks the duct. Pressure builds, the gland balloons, and pain peaks during or just after eating. This pattern, sometimes called mealtime syndrome, is the single most recognizable clue.6InnovAiT: Education and inspiration for general practice. Sialolithiasis Between meals the swelling often subsides partially, only to return at the next meal. Over time, repeated obstruction can lead to infection of the gland, which adds fever, redness, and pus draining from the duct opening.
When Conservative Measures Are Not Enough
Not every salivary stone needs surgery. For smaller, mobile stones sitting in the front portion of a duct, a combination of generous hydration, gland massage, and sour foods or drops that stimulate saliva flow (sialogogues) can sometimes flush the stone out on its own.4British Dental Journal. Salivary stones: symptoms, aetiology, biochemical composition and treatment Anti-inflammatory medications help manage pain in the meantime.7International Seven Journal of Multidisciplinary. THERAPEUTIC MANAGEMENT OF SIALOLITHIASIS: CONSERVATIVE TREATMENT PROTOCOLS WITH SIALOGOGUES AND HYDRATION The prognosis for conservative treatment depends heavily on the stone’s size, location, and whether it is firmly stuck. A tiny, freely mobile stone near the duct opening has a decent chance of resolving without an operation. A large, impacted stone wedged in the back of the duct or at the gland hilum does not.
Several factors tip the decision toward surgical removal. Stones that can be felt through the floor of the mouth (palpable stones) are good candidates for incisional sialolithotomy, and palpability was in fact a strong predictor of needing an incisional approach in one study. Larger diameter, submandibular location, and being clearly visible on a CT scan also predicted that a stone would need an open surgical retrieval rather than endoscopic extraction alone.8PubMed. Gland-preserving surgery for salivary stones and the utility of sialendoscopes Stones removed endoscopically in that series averaged about 5 mm, while those requiring incisional sialolithotomy averaged nearly 8 mm.
How Imaging Guides the Plan
Before any surgical approach, knowing the stone’s exact position and size is critical. Ultrasound is usually the first-line imaging tool because it is quick, cheap, and radiation-free. It picks up most duct stones reliably. For more detailed mapping, cone-beam CT with contrast injected into the duct (3D-CBCT sialography) and MRI-based sialography both perform well at detecting stones, with no statistically significant difference between the two modalities in one head-to-head comparison.9PubMed Central. A comparative study of three-dimensional cone-beam CT sialography and MR sialography for the detection of non-tumorous salivary pathologies In another study comparing CBCT sialography with ultrasound specifically for stones, both showed high sensitivity, though the CBCT approach had a slight edge in negative predictive value.10PubMed Central. A comparative study of three-dimensional cone beam computed tomographic sialography and ultrasonography in the detection of non-tumoral salivary duct diseases In practice, many surgeons start with ultrasound and add CT only when the stone is hard to localize or when they need to rule out multiple stones deeper in the gland.
The Submandibular Intraoral Technique Step by Step
The submandibular duct runs beneath the tongue along the floor of the mouth, opening at a small papilla near the front midline. During intraoral sialolithotomy, the patient’s mouth is open and the surgeon works from above, looking down at the floor of the mouth. An assistant pressing upward from below the jaw pushes the gland and duct contents toward the surface, making the stone bulge visibly under the mucosa when it is large enough.
For a stone that is clearly bulging into the floor of the mouth, the incision goes directly over it through the mucosa. The duct is found with gentle blunt dissection, opened along its length, and the stone is lifted out. If the stone is smaller and not visible from the surface, the surgeon makes a mucosal incision roughly 2 cm long, just inside the ridge where the gum meets the tongue, about 5 mm behind the duct opening. The sublingual gland is moved aside to expose Wharton’s duct, which can be confirmed by threading a thin cannula through the duct opening beforehand. The surgeon then works backward along the duct, progressively uncovering it until the hard yellowish stone becomes visible within the lumen.11Current Trends in Dentistry. Transoral Hilar Sialolithotomy – A Brief Note on Technique
Once the stone is out, the duct is flushed with saline and the gland is squeezed to expel any smaller fragments. The duct itself is typically left open (not sutured shut), which serves a practical purpose: it creates a wider drainage pathway, reducing the chance of re-obstruction. Only the front part of the mucosal wound is loosely stitched. The whole concept relies on the mouth’s remarkable healing capacity and the fact that a duct left open to the oral cavity will often form a new, wider opening (a marsupialised neo-ostium) on its own.
Protecting the Lingual Nerve
The lingual nerve, which provides sensation to the tongue, crosses underneath or sometimes over the submandibular duct in the back part of the floor of the mouth. In roughly 37.5 percent of people, the nerve actually crosses above the duct, sitting just below the surface mucosa, which puts it at particular risk during dissection for stones lodged far back.11Current Trends in Dentistry. Transoral Hilar Sialolithotomy – A Brief Note on Technique Injury can cause numbness or altered sensation on the affected side of the tongue.
The key protective strategy is to dissect the duct forward-to-back, progressively exposing it rather than diving straight to the stone’s location. This way the surgeon sees the nerve before encountering it, identified as a glistening white structure crossing the field. The duct should be opened only to the level of the stone, with adequate visualization of surrounding anatomy, rather than blindly extending the incision deeper.12PubMed. Prevention of lingual nerve damage by removing stones from submandibular salivary gland duct Complications involving lingual nerve dysfunction are significantly more common when the stone is located in the proximal (back) portion of the duct compared to stones in the middle or front.13PubMed. Risk Factors for Complications of Intraoral Removal of Submandibular Sialoliths This is a straightforward anatomical reality: the farther back you go, the closer the nerve is to the surgical field.
Reaching Parotid Duct Stones Through the Mouth
Parotid duct stones are less common, but they can also be approached intraorally when the stone is near the duct’s opening on the inside of the cheek (opposite the upper molars). In one reported case, a stone roughly 1 cm long that was impacted at an awkward angle near the duct orifice was removed through a small incision at the upper edge of the punctum. Once the incision was made, the stone bulged through and was pushed out, with the entire procedure done through the mouth under general anesthesia.14The Egyptian Journal of Otolaryngology. Transoral per punctum excision of an impacted parotid duct stone of unfavorable direction: a case report Parotid duct stones located further back toward the gland are harder to reach intraorally and may require endoscopic or external approaches instead.
Sialendoscopy-Assisted Hybrid Approaches
Pure sialendoscopy, where a tiny camera is threaded into the duct to locate and retrieve the stone, works well for small stones. But only about 15 to 20 percent of stones can be pulled out endoscopically without any fragmentation or additional incision. The rest are too large, too impacted, or too far back.15PubMed Central. Salivary lithotripsy in the era of sialendoscopy This is where the hybrid or “combined” approach comes in: a sialendoscope is inserted to locate the stone and illuminate it from inside the duct, and then the surgeon makes an intraoral incision directly over the light to cut down onto the stone with precision.
A systematic review of combined sialendoscopic-assisted surgery for submandibular stones found a success rate of about 95.5 percent, with only 2 percent of patients ultimately needing gland removal and an overall complication rate of 8 percent.16The Egyptian Journal of Otolaryngology. Efficacy of combined sialendoscopic-assisted surgery in management of submandibular sialolithiasis: a systematic review Another study focusing specifically on hilar and deeper stones found that about 89 percent of palpable stones and 67 percent of non-palpable ones could be removed this way, preserving roughly 87 percent of glands overall.17PubMed Central. To Evaluate the Success of Sialendoscopy Assisted Intraoral Approach for Removal of Submandibular Hilar Stones The endoscope’s value is greatest for stones that are not palpable from outside, because it gives the surgeon a target that would otherwise be invisible.
For stones that are truly embedded deep in the gland tissue and cannot be reached even with endoscopic guidance, options narrow. Extracorporeal shock wave lithotripsy (breaking the stone with focused sound waves from outside the body) is one alternative for the 10 to 20 percent of stones that no sialendoscope or intraoral incision can reach.15PubMed Central. Salivary lithotripsy in the era of sialendoscopy When even that fails, removing the gland entirely remains a last resort, though it is now needed far less often than it was a generation ago.
Intraoral Sialolithotomy for Deep Gland Stones
One area where the intraoral technique has been pushed further than many clinicians might expect is in retrieving stones that sit not in the duct but at the hilum (the junction where the duct enters the gland) or even within the gland tissue itself. Traditionally, these deep stones meant an automatic gland removal, particularly when sialendoscopy was not available. More recent work has described an intraoral approach under general anesthesia that accesses even intraparenchymal stones through the floor of the mouth, dissecting into the gland tissue from inside the oral cavity rather than through the neck skin. The result is gland preservation with restoration of secretory function.18Scientific Reports. A gland-sparing, intraoral sialolithotomy approach for hilar and intraparenchymal multiple stones in the submandibular gland This is technically more demanding than a straightforward duct stone removal, but it spares the patient both an external scar and the loss of a functioning salivary gland.
Complications and What to Expect
Intraoral sialolithotomy is generally safe, but it is not complication-free. In one study tracking risk factors for complications, the issues included dry mouth, wound infection, lingual nerve dysfunction, and stone recurrence. The complication rate was significantly higher for stones located in the proximal duct compared to those in the middle or front.13PubMed. Risk Factors for Complications of Intraoral Removal of Submandibular Sialoliths Lingual nerve problems were the complication most strongly linked to proximal stone location, which makes sense given the nerve’s anatomy in that region.
Bleeding during the procedure is usually controlled with pressure alone. In cases of brisk bleeding, bipolar cautery can be used carefully. Ranula (a cyst-like swelling from a damaged sublingual gland) is a recognized but uncommon complication when the sublingual gland is disturbed during dissection. Most patients experience some swelling and discomfort for a few days after surgery, controlled with standard pain medications and a soft diet.
Duct Repair and Stenting After Surgery
When a stone removal damages the duct wall or the duct opening, the concern is that scar tissue will narrow the duct (stenosis), leading to obstruction all over again. In these situations, a small plastic stent can be placed in the duct to keep it open while it heals. One series of 16 patients who received stents after duct reconstruction found that all had a patent, saliva-draining duct at last follow-up, with only one stent dislodging early.19Journal of Oral and Maxillofacial Surgery. Sialodochoplasty Stents: Cost Analysis and Outcomes Stenting is not routine after every sialolithotomy; it is reserved for cases where the duct or its opening has been significantly disrupted.20PubMed. Post-sialendoscopy ductoplasty by salivary duct stent placements
Long-Term Results and Recurrence
The long-term picture after intraoral sialolithotomy is encouraging. In one series following 118 cases for an average of 42 months, about 86 percent remained completely free of symptoms. Around 14 percent had mild residual obstructive or infectious symptoms, only about 3 percent developed new stones, and less than 1 percent eventually needed gland removal for persistent problems.21PubMed. Long-term outcome after intraoral removal of large submandibular gland calculi
A larger study of over 300 patients treated with minimally invasive approaches found a 5 percent recurrence rate over a mean follow-up of about 20 months. Recurrences appeared anywhere from 3 to 46 months after surgery, almost always in the same gland as the original stone. Most of the patients who recurred had been treated with a transoral approach.22PubMed. Salivary Gland Lithiasis Recurrence After Minimally-Invasive Surgery: Incidence, Risk Factors and Prevention Whether this reflects something about the transoral technique itself or simply the fact that it is used for larger, more problematic stones is hard to tease apart. The submandibular gland was the most common site for recurrence, consistent with its dominance in stone formation overall.
Gland Function and Quality of Life After Surgery
One of the strongest arguments for gland-sparing surgery over gland removal is that the preserved gland actually recovers its function. In a prospective study measuring salivary flow and gland activity after stone removal, improvements showed up within three months across both objective measurements and patient-reported symptoms.23PubMed Central. A Prospective Study of Recovery of Salivary Gland Function After Calculus Removal by Sialendoscopy Quality-of-life scores also improve dramatically. One study using a validated obstructive salivary gland questionnaire found mean scores dropped from 22.5 before surgery to 4.5 after, on a scale where lower is better.24PubMed Central. Transoral removal of submandibular hilar lithiasis: results on the salivary duct system, glandular parenchyma, and quality-of-life recovery Another study using a different questionnaire specific to salivary gland disease found similarly large improvements in both submandibular and parotid patients at follow-up.25Journal of Oral and Maxillofacial Surgery. Evaluation of Salivary Function Recovery Following Gland-Sparing Sialolithotomy: A Prospective Cohort Study
Losing a major salivary gland is not trivial. The submandibular glands produce a significant share of your resting saliva, and removing one can contribute to dry mouth, especially if the remaining glands are not compensating fully. Preserving the gland wherever possible means the patient gets symptom relief without trading one chronic problem for another.
Salivary Stones in Children
Salivary stones are uncommon in children, but they do happen, and the management philosophy is the same: preserve the gland whenever possible, because a child has decades of salivary function ahead of them. A study of pediatric sialolithiasis found that about 47 percent of children had their stones removed via a combination of sialendoscopy and intraoral incision, 35 percent through sialendoscopy alone, and 18 percent required gland removal. Stone location was the decisive factor: distal submandibular stones were removed endoscopically or with an intraoral incision in every case, while hilar and intraglandular stones had a 100 percent rate of gland removal.26International Journal of Pediatric Otorhinolaryngology. Sialoendoscopy and the management of pediatric sialolithiasis The anatomy in younger patients is smaller, which limits endoscope access and makes the hybrid intraoral approach especially useful for stones that are reachable but too large for purely endoscopic extraction.
The evidence in children is thinner than in adults simply because the condition is rarer. Still, the trend matches what is seen in adults: location and size matter more than any other variable in determining whether the gland can be saved. And for a child, saving the gland is arguably even more important.