- Open Access
Antibiotic prescription after tooth extraction in adults: a retrospective cohort study in Austria
BMC Oral Health volume 22, Article number: 519 (2022)
Broad spectrum antibiotics are often used for the prophylaxis of infectious endocarditis and treatment of odontogenic infections, but there are limited data related to antibiotic use and adherence to prescription guidelines.
Data from patients with tooth extraction between 2014 and 2018 were selected from a database of a regional health insurance fund. We created three data sets, one based on all tooth extractions, one on multiple teeth extractions, and one including only single tooth extraction. After data collection, descriptive analysis was carried out. The differences in prescription pattern of antibiotic medicine were tested by χ2 test, Student´s t-test or ANOVA.
From 43,863 patients with tooth extraction, 53% were female, and 3,983 patients (9.1%) filled a prescription for antibiotic medicine. From 43,863 patients, 157 patients (0.4%) had endocarditis risk, but only 8 patients of these (5.1%) filled an antibiotic prescription. In total, 9,234 patients had multiple and 34,437 patients had only one tooth extraction. Patients with more than one tooth extraction received more often antibiotic treatment (10.7%) compared to those with single tooth extractions (χ2 = 36; p < 0,001). Patients with more than one tooth extraction were older, however, younger patients received antibiotics more frequently (t = 28,774, p = 0.001). There was no relationship with endocarditis risk status. Clindamycin and amoxicillin/clavulanic acid were the most frequently prescribed antibiotic medicines.
In this retrospective cohort study, dentists did not discriminate prophylactic antibiotic prescription with regard to endocarditis risk status. A factor influencing prescribing behaviour of antibiotic medicines was the number of extracted teeth.
Dentists prescribe around 10% of all prescribed antibiotic medicine in primary care . Antibiotics are often prescribed as a prophylactic measure, in particular after tooth extraction . Broad-spectrum antibiotics such as penicillin with or without clavulanic acid are the most commonly prescribed antibiotic treatments by dentist [3,4,5,6,7]. For patients with penicillin allergy clindamycin is a frequently used therapeutic alternative . Antibiotic prescription after surgical procedures is also common in patients at risk to develop osteonecrosis of the jaw, which is linked to bisphosphonate and to denosumab treatment [9,10,11,12].
Antibiotic resistance is increasing and becoming a major healthcare problem . Due to enhanced antibiotic prescription a corresponding antimicrobial resistance pattern has been observed . Prophylactic antibiotic use in dentistry has been repeatedly addressed, as this may contribute to development of antibiotic resistance [15,16,17]. In comparison with other European countries, the use of antibiotics in Austria is only moderate . Between the years 2011 and 2015, the total consumption of antibiotics has increased by 3.8%, with beta lactams being the preferred treatment in Austria . The increase in antibiotic consumption continues, however, some countries have managed to reduce antibiotic prescription in recent years [20,21,22].
The clinical indication for antibiotic use in dentistry is controversially discussed in the literature. Dental extractions are performed for various reasons e.g. because of tooth caries, periodontitis, or impacted wisdom teeth. According to current guidelines only a small number of patients potentially benefits from antibiotic prescription for the prevention of infective endocarditis following invasive dental procedures [23, 24]. Some studies have reported a significant reduction in postoperative complications [25,26,27] while others [28, 29] did not find a positive outcome of routine use of antibiotic medicines. In particular, prophylactic antibiotic therapy after tooth extraction is under debate, since most of periodontal and dental infectious complications can be managed with simple oral hygiene measures or in urgent cases by surgical interventions.
The aim of the study was therefore to assess the practice of antibiotic prescription by dentists after tooth extraction in Austria. We also investigated the association of extraction procedure and/or number of teeth removed with antibiotic prescription patterns.
Material and methods
This retrospective study was approved by the Ethics Committee of the Medical University of Vienna (EK-No. 1932/2019) and performed in accordance with the Declaration of Helsinki. Patients informed consent was not required due to the retrospective design of the present study. The Ethics committee waived the requirement of informed consent for the use of retrospective data, consistent with provisions of the data protection act related to research use of existing individual medical information. Data were pseudonymized in accordance with data protection provisions and transmitted electronically on a password-protected computer server. Data user restriction was applied to the first and corresponding author and the statisticians had access to the data.
This population-based cohort study was conducted in patients with a tooth extraction between 2014 and 2018 by using the database of the regional health insurance (Burgenländische Gebietskrankenkasse, BGKK). Demographic data as well as tooth extraction diagnosis codes according to International Classification of Diagnosis (ICD–10) , and information on single medical interventions and services (MEL)  were used. Patients with endocarditis risk were classified by using MEL and ICD codes (MEL: valve replacement (DB), reconstruction of aorta with or without valve replacement (DG); ICD: congenital malformation of heart cavities and valves (Q20, Q21, Q22, Q24), endocarditis (I33, I38)) for mechanical or biological heart valve replacement, history of endocarditis, and patients with an underlying heart disease and as well as heart transplant patients who developed a valve disease.
Also, data on prescribed medication by a dentist between extraction day (day 0) and three days after intervention was retrieved from the respective databases utilizing the Anatomical Therapeutic Chemicals (ATC) classification system. The ATC classification is an international classification for pharmacological agents. Substances are listed in different groups according to organs they affect and their chemical, pharmacological and therapeutic characteristics. In Austria each medication has an additional unique Austrian pharmaceutical registration number, which is linked to the ATC-codes . Patients with antibiotic, antiphlogistic, analgesic, bisphosphate, and corticosteroid prescriptions were identified by ATC codes J01, M01, N01, M05BA and H02 and their subcodes, respectively. Bisphosphonate use was coded yes when prescribed within the last 6 months before the index event. Dental specialist/institution were either Tooth/Mouth/Maxillo-surgeon (TMM-SURGEON), dental practitioner (dentists), or TMM-SURGEON/dentists in out-patient clinics (DOC).
Data retrieval and collection into the databases and review were done by Berthold Reichardt, ÖGK. Data were pseudonymized before transfer and further storage and handling was also in accordance with data protection provisions.
Data from 50,779 patients were eligible for our study (Fig. 1). 6,870 patients were younger than 18 years old and therefore not used for further analysis. In addition, a small percentage of 0,1% of patients (n = 46) were treated by a “dental technician-dentist” and excluded. During the observation period from 2014 to 2018 over 110,000 teeth were extracted in 43,863 adult patients. The number of teeth extracted ranged between one and 30 per patient within the observation period and between one and 25 per patient per day.
We therefore created three data sets, one based on all tooth extractions (dataset-all extractions, n = 43,863), one based on multiple teeth extractions (dataset-multiple extractions, n = 9,234), and one based on only single tooth extraction at the first visit (dataset-single-extractions, n = 34,437). For all datasets the first treatment was considered as the index event. The date of index event was used as reference for matching variables such as age, endocarditis risk, bisphosphonate intake, and filled antibiotic prescriptions.
The analysis set of dataset-all extractions therefore contains 43,863 patients with the following variables: age, sex, antibiotic and bisphosphonate prescription, endocarditis risk, and information on dental specialist/institution where the extraction was executed. The dataset-single extraction is limited to 34,437 patients with only one tooth extraction during the index intervention.
Tooth extraction was defined as three different types of procedures: simple extraction, surgical extraction, or retained tooth extraction. Tooth groups were categorized to form five categories (Incisors, canines, Premolars, 1st and 2nd molars, and 3rd molars).
A descriptive analysis of all available variables was performed. Continuous and categorical variables were expressed as mean ± standard deviation (SD) or frequencies and percent, respectively. Differences in antibiotic prescription rate for categorical variables were tested by χ2 test and for continuous variables by student's t- test or ANOVA. P values < 0.05 were regarded as statistically significant. For statistical analyses SPSS 11.0 for Windows (SPSS 11.0, SPSS Inc.) was used.
Demographic data for dataset-all extractions (n = 43,863)
Table 1 presents the patients characteristics from dataset-all extractions. Bisphosphonates were prescribed in 1,005 patients (2,3%), from which 77 patients (7.7%) had a prescription of antibiotics. 157 patients (0.4%) had an endocarditis risk, from which 8 patients (5.1%) filled a prescription of antibiotic medicine. The treatment of patients with endocarditis risk or the prescription of bisphosphonate were not associated with treating specialist/institution. Tooth extractions of outpatients were done by TMM-SURGEON in 34,429 patients (78.5%), followed by dentists in 6,544 patients (14,9%), and by out-patient clinics in 2,890 patients (6,6%).
Demographic data for multiple teeth extraction (n = 9,234)
Bisphosphonates were prescribed in 271 patients (2.9%) and 49 patients (0,5%) had an endocarditis risk. Tooth extraction of outpatients were done by TMM-SURGEON in 78.5%, followed by dentists in 14.9%, and by and out-patient clinics in 6.6% of patients.
Demographic data for single-tooth extraction (n = 34,437)
From 34,437 patients from dataset-single extraction, 18,405 female and 16,032 male patients with an age range of 18–99 years were analyzed. 108 patients (0.3%) had an endocarditis risk and 734 patients (2.1%) took bisphosphonates.
Table 2 presents antibiotic prescription from dataset single extraction and all extraction. Patients with more than one tooth extraction received significantly more often antibiotic treatment compared to those with single tooth extractions (10.7% vs.8,6%; χ2 = 36; p < 0.001). Although patients with more than one tooth extraction were older, patients with antibiotic prescription were significantly younger (46 ± 17 vs. 54 ± 18; t = 28,774; p = 0.001).
Clindamycin (J01FF01) and amoxicillin/clavulanic acid (J01CR02) were the most frequently prescribed antibiotic medicine. As shown in Table 3, dentists prescribed more often antibiotics (11.8/11.1%) compared to TMM-SURGEON (8.8/8.5%) and DOC (5.5/5.3%) (χ2 = 108/66; p < 0.001). A similar significant difference in prescription rate was also shown for amoxicillin/clavulanic acid compared to clindamycin and other antibiotics in database-all-extractions (χ2 = 310; p < 0.001) and in database-single-extractions (χ2 = 226; p < 0.001) (Table 4).
Extraction and procedure type
For this analysis we used the dataset-single tooth extraction. Most single-tooth extraction procedures were done as simple extraction (54.6%) followed by surgical extraction (41.2%) and retained tooth extraction (4.2%). Tooth extraction details are presented in Table 5. More than 60% of all extractions were carried out in molar teeth.
Antibiotic prescription according to type of tooth extraction
For this analysis we used data from patients with single tooth extractions (dataset-single-extractions). Neither prescription rates nor antibiotic type differed between men and women or were influenced by endocarditis risk or by bisphosphonate co-medication.
A simple tooth extraction was done in 2.8%, 3.2%, 5.5%, 6.4%, and 3.5% in incisors, canines, premolars, 1st and 2nd molars, and 3rd molars, respectively. A surgical tooth extraction was done in 27.2%, 7.1%, 9.8%, 12.8%, and 14.2% in incisors, canines, premolars, 1st and 2nd molars, and 3rd molars, respectively. Table 6 presents antibiotic prescription according to type of tooth extraction. Antibiotic prescription trend increased from simple to surgical and retained tooth extraction (χ2 = 185; p < 0.001). Antibiotic prescription was highest in patients with retained 3rd molars tooth extraction.
Although the number of medical procedure and tooth group extraction did not differ between dentists and TMM-SURGEON, dentists significantly more often prescribed antibiotic medicines compared to TMM-SURGEON for simple as well as for surgical extraction, but not when extracting a retained tooth.
This retrospective cohort study utilized a large-scale dataset to evaluate patterns of antibiotic prescription after tooth extraction and factors affecting antibiotic prescription from a regional health insurance in Austria. We found that about 10% of patients undergoing tooth extraction received antibiotic medicine, which is similar to reports from studies conducted in the UK  and Germany . In Belgium, however, only 4.2% of patients had an antibiotic prescription after dental procedures . In the Belgian sample the small number of patients under study and the 2-week self-reporting period may contribute to this difference.
Our second finding was that 0.3% (157) of patients with tooth extractions had an endocarditis risk, from which only 8 patients received an antibiotic therapy. The reported efficacy of prophylactic antibiotics to prevent or minimize bacteremia has been discussed controversially [34, 35]. Also, the existing evidence and current guideline recommendation do not support the extensive use of antibiotics [36,37,38]. A recent study showed that dentists routinely prescribe antibiotics to avoid posttreatment complications or even for nonclinical factors (e.g. patients’ insistence or postponing procedures) . However, the percentage of antibiotic use in this population at risk was smaller than that in the population at large. This suggest that a symptomatic risk screening has not been conducted on the basis of underlying concomitant diseases, but prescription of medications was predominantly guided by physician’s perception.
Thirdly, our results showed that 2.1% of patients with tooth extraction had a prescription for a bisphosphate. Bisphosphonate can induce medication-related osteonecrosis of the jaw, and is associated with osteonecrosis after dental extraction in patients with osteoporosis ranging from 0.09% to 0.34% . The link between osteonecrosis of the jaw and bisphosphonate intake is well-known and the benefit of antibiotic prophylaxis and/or treatment in these patients has been discussed in previous studies [40, 41].
Furthermore, the rate of antibiotic prescription was higher in female than in male patients. Also, younger age was associated with higher rates of antibiotic prescription. This is likely because complex procedures, which involve invasive techniques to extract impacted teeth are more often done in younger patients, while older patients tend to have simple tooth extractions due to periodontal diseases [42, 43].
Comparison of antibiotic use between surgeons (TMM-surgeon), dentists, and dental clinics (DOC) showed that antibiotics were more often prescribed by dentists in both single and multiple teeth extraction. While the most frequent antibiotic prescribed by dentists and DOC was amoxicillin/clavulanic acid, TMM-surgeons prescribed preferentially clindamycin. It should be noted that before 1989 dentists completed their studies in general medicine and then started their specialist training for dental, oral and maxillofacial medicine in Austria. Since 1998 dentists in Austria have established a separate curriculum, with the exception of orthodontics. A previous study in Austria found that only 6.6% of dentists completed special training on antibiotics and 85.2% graduated the compulsory advanced training diploma of the Austrian Dental Association (ÖZÄK). However, there was no association between the frequency of antibiotic prescription in relation to training and duration of practice . In contrast, a study from Asia reported a significant difference in the likeliness of antibiotic prescribing and the level of qualification, which may be linked to different education systems .
Furthermore, our results showed that the most frequently prescribed antibiotics after tooth extraction were clindamycin and amoxicillin/clavulanic acid. Patient-reported penicillin allergy is a common reason why dentists may prescribe clindamycin in Austria. Penicillin allergy occurs in 10–20% of patients, yet a high percentage of patient-reported history of penicillin allergy are likely to be erroneous . While penicillin with or without beta-lactamase inhibitors are the most frequently prescribed antibiotics by dentists, clindamycin prescription varies among different countries [5, 14, 47,48,49,50]. These differences are likely due to different study design, demographics, health policies, and clinical experiences. Furthermore, the present study investigated not only single but also multiple teeth extractions on the index day, which may result in a greater frequency of broad-spectrum antibiotic prescription as a precautionary measure.
Resistance to antibiotics is still a concerning issue in patients with valvular heart disease and the AHA/ACC guidelines have a clear recommendation when to prescribe these medicines . The indication for prophylactic antibiotic treatment is therefore limited as most periodontal and dental diseases are best managed by simple oral hygiene measures and operative interventions. However, as shown in our study dentists empirically prescribe broad spectrum antibiotics. Recent studies may offer new innovative therapies as a possible alternative . Hence, educational programs for dentist and patients should be promoted. In Sweden, such a program achieved a reduction in the prescription rate of antibiotic prescription .
Our study has several limitations. Besides the retrospective design, the lack of information on dosage, frequency and duration of administration, the combinations of antibiotics, and the reasons for individual prescriptions have to be mentioned. Furthermore, we did not have data on clinical course and patient’s outcome after taking antibiotic medicine.
In conclusion, the general adherence to guideline recommendations for antibiotic prescription after tooth extractions is low. Prophylactic antibiotic prescription is not limited to high-risk patients. Hence, a training program to improve antibiotic use in dental practice to selected patients at risk rather than to reduce clinical symptoms such as pain and swelling should be considered.
Availability of data and materials
The datasets used and/or analysed during the current study available from the corresponding author on reasonable request.
International Classification of Diagnosis
Medical interventions and services
Anatomical Therapeutic Chemicals
TMM-SURGEON/dentists in out-patient clinics
Austrian Dental Association
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Ethics approval and consent to participate
This retrospective study was approved by the Ethics Committee of the Medical University of Vienna (EK-No. 1932/2019) and performed in accordance with the Declaration of Helsinki. Patients informed consent was not required due to the retrospective design of the present study. The Ethics committee waived the requirement of informed consent for the use of retrospective data, consistent with provisions of the data protection act related to research use of individual medical information.
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Sheikh Rezaei, S., Litschauer, B., Anderle, K. et al. Antibiotic prescription after tooth extraction in adults: a retrospective cohort study in Austria. BMC Oral Health 22, 519 (2022). https://doi.org/10.1186/s12903-022-02556-w
- Antibiotic prophylaxis
- Cohort studies
- Endocarditis prevention & control