Variation in dental occlusal schemes two years after placement of single-implant posterior crowns. A preliminary study

2021 ◽  
Author(s):  
Paula Prieto-Barrio ◽  
Laura Khoury-Ribas ◽  
Bernat Rovira-Lastra ◽  
Raul Ayuso-Montero ◽  
Jordi Martinez-Gomis
Keyword(s):  
Prospective Study ◽  
Maximum Force ◽  
Occlusal Contact ◽  
Adjacent Tooth ◽  
Natural Teeth ◽  
Preliminary Study ◽  
Single Crowns ◽  
Single Implant

Some authors have recommended that implant-supported single crowns should only contact during heavy clenching. However, a lack of occlusal contact with moderate clenching may cause supra-eruption of antagonist natural teeth. The main objective of this study was to assess changes in the occlusal contacts of posterior implant-supported single crowns with natural antagonist teeth two years after placement. The occlusal schemes of 14 patients who received 16 implant-supported single crowns in molar and premolar regions were assessed in this prospective study. Just after crown placement, at 6 months and after 2 years a silicone maxillomandibular relationship and T-scan records were obtained during the intercuspal position with light and heavy clenching, determined using near half of the maximum force and maximum force respectively. Occlusal contacts were assessed quantitatively and qualitatively in the implant-supported single crowns, contralateral tooth and adjacent tooth; the latter two were used as controls. After six months and two years, no significant variations were observed in any region of the occlusal scheme in any assessments, including silicone record or T-Scan, using light or heavy clenching, and qualitative or quantitative occlusal contact assessment. In this preliminary study, the occlusal scheme did not vary at the intercuspal position two years after placing posterior implant-supported single crowns.

Wireless parathyroid detection device using autofluorescence and smart glasses: A preliminary study

2021 ◽  
pp. 1-9
Author(s):  
Chang Hwan Ryu ◽  
Jungirl Seok ◽  
Yu Lim Choi ◽  
Seok-ki Kim ◽  
Yuh-Seog Jung ◽  
...  
Keyword(s):  
Prospective Study ◽  
Large Scale ◽  
Video Recording ◽  
Controlled Study ◽  
Autofluorescence Imaging ◽  
Agreement Rate ◽  
Smart Glasses ◽  
Practical Effect ◽  
Preliminary Study ◽  
Positive Agreement

BACKGROUND: Autofluorescence imaging technology has been utilized for preserving or identifying parathyroid glands (PTGs) during thyroid surgery. We developed a wireless PTGs detection device linked with smart glasses that allows for real-time video recording and screen switching according to the light source. OBJECTIVE: This study aimed to confirm the feasibility of the device and whether it would help preserve the PTG during the surgery. METHODS: This prospective study was conducted in 30 patients with 66 PTGs. The device’s agreement with the physician’s judgment was evaluated, and we determined how many PTGs were preserved from thyroidectomy. RESULTS: The positive agreement rate for PTGs detection between the surgeon and device was 70.9%. Inadvertent parathyroidectomy was identified in surgical specimens of 6 patients (20%). No PTG was removed when it was confirmed by the device (0/39). Of the 27 glands not detected by the device, there was inadvertent removal of 6 PTGs. CONCLUSIONS: PTGs can be preserved successfully when the detection of them by the device is consistent with the surgeon’s discretion. A large-scale controlled study is necessary to demonstrate the practical effect of this device on hypoparathyroidism after thyroidectomy.

Wideband Absorbance in Ears with Retraction Pockets and Cholesteatomas: A Preliminary Study

2021 ◽  
Author(s):  
Sreedevi Aithal ◽  
Venkatesh Aithal ◽  
Joseph Kei ◽  
Shane Anderson
Keyword(s):  
Prospective Study ◽  
Roc Curve ◽  
Operating Characteristic ◽  
Peak Pressure ◽  
Clinical Sample ◽  
Ambient Pressure ◽  
Control Group ◽  
Retraction Pockets ◽  
Preliminary Study ◽  
The Difference

Abstract Objectives The objective of this study was to describe wideband absorbance (WBA) findings in patients with cholesteatomas and retraction pockets (RPs). Design In this prospective study, tympanometry, audiometry, and wideband tympanometry (WBT) were performed on 27 ears with an RP (eight with epitympanic RP and 19 ears with mesotympanic RP), 39 ears with a cholesteatoma (23 ears with epitympanic and 16 ears with mesotympanic cholesteatomas [MCs]), and 49 healthy ears serving as controls. Results Mean WBA at ambient pressure (WBAamb) of both experimental groups was reduced significantly between 0.8 and 5 kHz relative to the control group. The difference between mean WBAamb and mean WBA at tympanometric peak pressure (WBATPP) was greater for the RP (0.12–0.16 between 0.5 and 1.5 kHz) than for the cholesteatoma group (0.03–0.11 between 0.6 and 3 kHz). Mean WBAamb of both epitympanic RP (ERP) and epitympanic cholesteatoma (EC) subgroups was significantly lower than that of the control group. Mean WBATPP of the ERP subgroup attained normal levels as per the control group, while mean WBATPP of EC subgroup was significantly lower than that of the control group at 0.8 to 1.5 kHz and 4 to 5 kHz. In contrast, both mesotympanic RP and MC subgroups demonstrated similar mean WBAamb and WBATPP values. No significant differences in WBAamb and WBATPP results between the RP and cholesteatomas groups were observed. Receiver operating characteristic (ROC) analyses indicated that the area under the ROC curve for distinguishing between the RP and cholesteatomas groups ranged from 0.44 to 0.60, indicating low accuracy in separating the two groups. Conclusion While it is not possible to distinguish between the RP and cholesteatomas groups based on the WBAamb and WBATPP results, it is potentially feasible to differentiate between the EC and ERP conditions. Further study using a large clinical sample is recommended to determine the sensitivity and specificity of the WBA test to identify the EC and ERP conditions.

scholarly journals Aesthetic Outcomes and Peri-Implant Health of Angled Screw Retained Implant Restorations Compared with Cement Retained Crowns: Medium Term Follow-Up

2021 ◽  
Vol 12 (2) ◽  
pp. 35
Author(s):  
Livia Nastri ◽  
Ludovica Nucci ◽  
Vincenzo Grassia ◽  
Rino Miraldi
Keyword(s):  
Bone Loss ◽  
Functional Results ◽  
Technical Solution ◽  
Marginal Bone Loss ◽  
Single Tooth ◽  
Natural Teeth ◽  
The Aesthetic ◽  
Single Implant ◽  
Single Tooth Implant

Single tooth implant restorations in the aesthetic area are a demanding challenge. If a complete osseointegration is mandatory, the final result has to result in a higher standard of biomimetic and soft tissue health among natural teeth. This outcome is traditionally pursued by cementing crowns over individualized abutments. However, in recent years, the need for controlling peri-implant health and the preference towards a retrievable solution has led to an increase in screw-retained crowns, which is not always applicable when the implant axis is not ideal. In the aesthetic area, the use of a novel technical solution represented by the angled screw channel (ASC) of the abutment has been proposed in order to match the advantages of the screwed solution with the aesthetic demands. The aim of this study was to compare ASC crowns to cemented crowns (CC) in single implant restorations using the white esthetic score (WES) and pink esthetic score (PES) at the crown delivery and at a follow-up of a minimum of 2 years. Peri-implant health and marginal bone loss (MBL) were also evaluated. The mean follow-up was 44.3 months, with a mean MBL of 0.22 mm in the ASC group and 0.29 mm in the CC group. The total WES/PES score was 16.6 for ASC, compared with 17.3 for CC at baseline, and 16.2 and 17.1, respectively, at follow-up. Both of the groups reached a high WES/PES, and this was maintained over time, without signs of peri-implant diseases or bone loss, regardless of the choice of connection. In conclusion, ASC can be adopted in cases where the implant axis is not ideal, with aesthetic and functional results that are comparable to implants restored by cemented crowns.

The influence of mammaplasty on axillary lymphatic drainage patterns and sentinel lymph node detection: A 40-patient prospective study including the 20 first patients of the preliminary study.

2012 ◽  
Vol 30 (15_suppl) ◽  
pp. e21056-e21056
Author(s):  
Eric Gremillet ◽  
Claude Soler ◽  
Catherine Bouteille ◽  
Aline Steiner ◽  
Benjamin Geissler
Keyword(s):  
Lymph Node ◽  
Sentinel Lymph Node ◽  
Prospective Study ◽  
Lymphatic Drainage ◽  
Average Value ◽  
Drainage Patterns ◽  
Before And After ◽  
Preliminary Study ◽  
The Difference ◽  
The Impact

e21056 Background: In the field of sentinel lymph node (SLN) for patients with previously breast surgery, opinions are not definitive. On the first hand, the ASCO in 2005 recommended that SLN biopsy should not be performed in patients with previous mammaplasty or axillary surgery, but, on the other hand, the same panelists of the ASCO guideline suggested that a preliminary lymphoscintigraphy (LSG) could be done when considering a SLN biopsy in patients with previous mammaplasty, with the objective of verifying the integrity of axillary nodes. We started a prospective study in January 2009, to evaluate the location of sentinel lymph node (SLN) before and after mammaplasty. The preliminary results of the first 20 patients were presented in June 2010 (Chicago, ASCO), however it was to be necessary to have more patients to validate these encouraging results. The results of additional study is presented here. Methods: 40 patients who underwent mammaplasty were evaluated by LSG acquired with a SPECT-CT immediately after intradermal periareolar injections of 99mTc -labelled sulphur colloid at two time points: before mammaplasty (Pre-LSG) and between 40 to 60 days after mammaplasty (Post- LSG). Results: The localisation of hot SN was evaluated as in the first study, using the SPECT-CT images : - antero-posterior distance was estimated in centimeter from SLN region to dorsal vertebrae spine center. - SLN’s coronal position was compared to rib cage. The average value of 40 antero-posterior distance before and after surgery was 14.2 vs 14.4 centimeters, in the preliminary study it was 13.6 vs 13.8 centimeters, the difference keeps the same between 2 studies (2 millimeters). As in the first study, SN was in the same position in relation to grill rib. The binomial test did not show statistical difference in lymphatic drainage patterns between Pre-LSG and Post-LSG. Conclusions: after evaluating the impact of the previous mammaplasty surgery on the SLN position, we observed that surgery did not modify lymphatic mapping and thus that it may be possible to propose SLN biopsy even after mammaplasty. This study confirms the results of our preliminary study.

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