Smokeless Tobacco Use Linked to Periodontitis – Recent Dental Research Findings (2)

A multinational study involving the United States, India, and Italy has revealed that smokeless tobacco (SLT) users are more likely to develop periodontitis compared to non-users, with global variations in the relationship between SLT and periodontitis underscoring the necessity for targeted interventions, especially in economically disadvantaged areas where SLT use is unregulated. The study was published online in the Journal of Periodontal Research on May 17, 2024.

To investigate the relationship between SLT and periodontitis, researchers searched seven databases to determine the prevalence of periodontitis among adult SLT users and non-users. The quality of the studies was assessed, and various methods were employed to address bias. Sensitivity analyses were conducted, stratified by country income level, SLT type, and smoking status, using robust variance estimation.

The results indicated that 29 studies were selected from 484 initial studies for qualitative synthesis, with data from 19 studies included in the meta-analysis. SLT users were nearly three times more likely to develop periodontitis than non-users [odds ratio (OR) 2.99, 95% confidence interval 2.10-4.27, P < 0.01]. The type of SLT used or concurrent smoking did not alter the risk estimate. However, the incidence of periodontitis varied by country economic level, with higher combined estimates in high-income countries (OR 1.69; 95% confidence interval 1.20-2.37, P < 0.01) and even higher in middle-low and low-income countries (OR 3.91; 95% confidence interval 2.66-5.77; P < 0.05).

Original title: Smokeless tobacco and periodontitis: A systematic review with meta-analysis

Full-Arch Implantation,Calibrated Intraoral Scan Protocol Demonstrates High Accuracy

A multinational study involving the United States, China, and Spain has shown that for full-arch implantation, the use of a calibrated intraoral scanning protocol (CISP) is as accurate as the gold-standard traditional open-tray impression technique and outperforms it in virtual passive seating tests. The study was published online in the Journal of Clinical Implant Dentistry and Related Research on May 15, 2024.

The study aimed to evaluate the application of intraoral scanning in improving the accuracy of full-arch implant impressions. Six implants in the same edentulous maxillary model were imaged using four methods: intraoral scanning (IOS), intraoral scanning with scan aid (IOS-SA), CISP, and conventional open-tray impression (CONV). Each method was repeated ten times, with an extraoral scanned model used as a reference. The scan results were aligned with the reference model to assess overall fit and simulate a Sheffield test for passive testing of multiple implant-supported restorations. The deviation from the reference model (trueness) and the linear deviation within each group (precision) were analyzed. The results showed that the CISP group had comparable mean trueness (38.33μm) and precision (45.97μm) to the CONV group (44.30 and 47.92μm), both significantly better than the IOS group (86.82μm and 83.17μm). Additionally, in the simulated Sheffield test, the CISP group achieved the highest mean trueness (121.7μm) at the distal cantilever, with linear deviations reduced by 36.7%, 60%, and 41.4% compared to the CONV, IOS, and IOS-SA groups, respectively. Furthermore, the CISP group (104.3μm) outperformed the CONV (deviation reduced by 65μm), IOS (deviation reduced by 182μm), and IOS-SA (deviation reduced by 86μm) in terms of precision.

Original title: Calibrated intraoral scan protocol (CISP) for full-arch implant impressions: An in vitro comparison to conventional impression, intraoral scan, and intraoral scan with scan-aid