A routine dental visit in San Diego ended in tragedy when 9-year-old Silvanna Moreno died just hours after undergoing a dental procedure involving sedation and multiple treatments. The child had been treated at Dreamtime Dentistry in Vista, where she underwent a root canal and additional dental work. Her death has since prompted an investigation and raised questions about the events surrounding her care.
According to reports from multiple outlets, Silvanna had been suffering from persistent tooth pain for several months before being referred for treatment. On March 18, she was brought to the dental clinic for what was described as an extended procedure lasting several hours. The treatment reportedly included a root canal on a molar, placement of a crown, and extraction of several decayed teeth, both baby and permanent.
Medical Background and Pre-Procedure Condition
In the days leading up to the procedure, Silvanna had reportedly experienced tooth-related discomfort, and at one point, her mother indicated she had a fever that was treated with children’s medication. However, according to statements from the dental clinic, a pre-operative form completed by the parent indicated that the child was not sick at the time of the appointment.
The clinic has stated that if they had been informed of any ongoing illness or recent fever, the procedure would have been postponed until the patient was in a stable condition. This point has become part of the broader review into the circumstances surrounding the case.
Medical clearance and pre-operative screening are standard procedures before sedation dentistry, especially in pediatric cases. These protocols are intended to identify potential risks that could complicate anesthesia or recovery.
Dental Procedure and Sedation
On the day of the procedure, the child was treated by Dr. Ryan Watkins, who served as the dentist and anesthesiologist at the clinic. According to the clinic’s statement, sedation was administered before the dental work began, and the procedure was completed without any reported complications at the time.
The clinic later stated that the patient was continuously monitored throughout the procedure, including during recovery from anesthesia. Following completion of the treatment, she was reportedly discharged in stable condition, awake, and with vital signs within normal range, according to information shared with media outlets.
The clinic emphasized that standard post-anesthesia protocols were followed before the child left the facility under her mother’s care.
Condition After Returning Home
After leaving the dental office, Silvanna returned home with her family. Reports indicate that she appeared drowsy and was heavily affected by the sedation, which is not uncommon after procedures involving anesthetic medications. Family members noted that she was sleeping for an extended period after arriving home.
As time passed, her condition reportedly changed. Family members observed that her breathing became slower and less regular. Concerned by the changes, her grandmother checked on her condition more than once.
Eventually, the child became unresponsive, prompting her family to call emergency services. Paramedics arrived and transported her to Rady Children’s Hospital in San Diego for emergency treatment.
Emergency Response and Hospital Outcome
At the hospital, medical staff found that Silvanna was in cardiac arrest, specifically described as asystole, a condition in which the heart stops electrical activity and ceases to pump blood. Despite immediate life-saving efforts by medical personnel, the child did not recover.
Asystole is a critical medical emergency that requires immediate intervention, including CPR and advanced resuscitation measures. Even with rapid treatment, outcomes are often poor when the condition persists for extended periods without successful reversal.
Silvanna was later pronounced dead at the hospital despite resuscitation efforts.
Medical Examiner Findings
Following the child’s death, a medical examination was conducted to determine the cause. The medical examiner later ruled the cause of death as methemoglobinemia in the context of recent nitrous oxide administration.
Methemoglobinemia is a rare condition involving changes in the blood that reduce its ability to carry oxygen effectively. It can occur in rare circumstances involving exposure to certain medications, chemicals, or anesthetic agents. In medical settings, it is recognized as an uncommon but serious complication.
Reports indicated that contributing factors may have included the use of multiple anesthetic medications during the procedure. The combination of drugs used in sedation dentistry can vary depending on patient needs, but must always be carefully monitored due to potential risks.
Statements From the Dental Clinic
In statements provided to media outlets, Dreamtime Dentistry said that the patient was monitored throughout the procedure and showed no immediate signs of distress during treatment or recovery. The clinic stated that her oxygen levels remained within normal ranges while she was under care.
The dentist involved also stated that no warning signs of methemoglobinemia were observed during or after the procedure. According to his statement, if any indications of such a condition had been detected, emergency protocols would have been initiated immediately, including hospital transfer.
The clinic has stated that an internal review is being conducted to evaluate the case and ensure that all procedures followed standard medical and dental guidelines.
Previous Scrutiny of the Dentist
Reports have also noted that Dr. Ryan Watkins had previously been the subject of a regulatory investigation. In 2016, the California Dental Board reviewed a separate case involving a patient who experienced a serious medical emergency during treatment.
That earlier case involved anesthesia administration and resulted in a lawsuit that was later settled. Following the investigation, disciplinary measures were reportedly taken, including a period of professional probation from 2020 to 2023.
These prior events have drawn renewed attention in light of the recent case, as investigators and the public seek to understand the full medical and procedural history.
Ongoing Investigation and Community Impact
As of now, Silvanna Moreno’s death has been officially classified as accidental. However, investigations remain ongoing, including internal reviews and further evaluation of the circumstances surrounding the procedure and post-operative care.
The case has deeply affected the local community in San Diego, where the family and others have expressed grief over the loss of a young child following what was expected to be a routine dental treatment.
Authorities and medical professionals continue to review the sequence of events to determine whether all safety protocols were properly followed and whether any additional factors contributed to the outcome.
