Smile esthetic evaluation of mucogingival reconstructive surgery

To assess the difference in smile esthetic impact of Coronally Advanced Flap (CAF) with or without the adjunct of a collagen matrix (CMX) used as root coverage procedures. Subjects with esthetic demands showing multiple upper gingival recessions of at least 2 mm, without interproximal attachment loss and cervical abrasion no more than 1 mm were recruited and randomized to CAF plus CMX or CAF alone. The Smile Esthetic Index (SEI) was adopted to quantify the quality of the smile recorded at baseline and 12 months after treatment for each treatment group. In addition, between group difference in the SEI was calculated. 24 Patients were treated and analysed. At baseline, mean gingival recession depths were 2.3 ± 0.7 mm for Test group and 2.6 ± 1.0 mm for Control group. After 1 year, the residual recession depth was 0.3 ± 0.4 mm in the CAF + CMX group and 0.6 ± 0.3 mm in the control group. The SEI at baseline was 8.1 ± 1.0 and 7.9 ± 0.7 for Test and Control group, respectively. The between groups difference at 12 months in SEI was 0.4 (95% C.I. − 0.0 to 0.8, P = 0.0697). Twelve months after treatment, CAF + CMX provided a similar SEI compared to CAF alone and the adjunct of a collagen matrix did not show a different impact on the smile esthetic appearance

Natural or Palatal Positioning of Immediate Post-extraction Implants in the Aesthetic Zone? Five-year Outcomes of a Multicentre Randomised Controlled Trial

PURPOSE. To evaluate whether there is a difference in aesthetic outcomes when positioning immediate post-extractive implants in the “central” position (where the natural tooth would be in relation to adjacent teeth/implants) as opposed to roughly 3 mm more pala-tally. MATERIALS AND METHODS. Just after tooth extraction, 20 patients requiring one single immediate maxillary post-extraction implant, from second premolar to second premolar, were randomly allocated to receive one implant positioned in either the natural “central” position (central group; 10 patients), or about 3 mm more palatally (palatal group; 10 pa-tients) according to a parallel-group design at two different centres. When needed, sites were reconstructed, and bone-to-implant gaps were filled with granules of anorganic bovine bone and covered by resorbable collagen barriers. Implants were left submerged for 4 months and rehabilitated with provisional crowns, replaced after 4 months by definitive metal-ceramic crowns. Patients were followed up to 5 years after loading. Outcome measures were: crown and implant failures; complications; aesthetics, assessed using the pink aesthetic score (PES); peri-implant marginal bone level changes; and patient satisfaction, recorded by blinded assessors. RESULTS. Three patients from each group dropped out within 3 years after loading. Five years after loading, there were no significant differences between the two groups in median PES score, assessed by a blind assessor, (central: 10 [IQR: 5.5], palatal: 8.5 [IQR: 6.75], median difference =-1.0; 95% CI:-7.0 to 4.0; P = 0.571); median bone level (central: 0.45 mm [IQR: 1.76], palatal: 0.45 mm [IQR: 1.93], median difference = 0 mm; 95% CI:-1.7 to 3.0; P = 1.000); bone level changes (central: 0.15 mm [IQR: 0.70], palatal:-0.05 mm [IQR: 1.23], median difference =-0.20 mm; P = 0.471); implant failures (one in each group, 14%, difference in proportion = 0.00; 95% CI:-0.39 to 0.39; P = 1.000); or complications (two palatal group patients and one central group patient, difference in proportion = 0.14; 95% CI:-0.28 to 0.52; P = 1.000). Furthermore, patients from both groups were equally satisfied with both function and aesthetics (both P = 0.699). CONCLUSIONS. These preliminary results suggest that positioning of immediate post-ex-traction implants 3 mm more palatally may not, in fact, improve aesthetics; however, the sample size of the present study was very limited, and larger trials are therefore required to confirm or refute these findings

O(alpha_s) Spin-Spin Correlations for Top and Bottom Quark Production in e+ e- Annihilation

We present the full O(alpha_s) longitudinal spin-spin correlations for heavy-quark pair production at e+ e- high-energy colliders in closed analytical form. In such reactions, quark and antiquark have strongly correlated spins, and the longitudinal components are dominant. For the explicit computation of the QCD bremsstrahlung contributions, new phase-space integrals are derived. Explicit numerical estimates are given for t t_bar and b b_bar production. Around the Z-peak, QCD one-loop corrections depolarize the spin-spin asymmetry for bottom quark pairs by approximately -4%. For top pair production, we find at 350GeV a 0.6% increased polarization over a value of 0.4 in the longitudinal correlation. For more than 1 TeV the O(alpha_s) corrections enhance depolarization to -2% in the top-pair case.Comment: 17 pages (Latex) + 6 figures (PostScript) [final version of manuscript as to appear in Physics Letters B

Oral lichen planus and diabetes mellitus. A clinico-phatological study

A study was made of 72 patients with oral lichen planus associated (n = 28) or not with diabetes mellitus (n = 44). No significant differences were observed between both groups in terms of the location of the lichen planus lesions on the buccal mucosa, palate, gums or floor of the mouth. On the other hand, the diabetics exhibited a greater frequency of oral lichen planus on the tongue. Atrophic-erosive lesions were more common in patients with lichen planus associated with diabetes. Finally, no differences were observed between the two groups in terms of absolute inflammatory infiltrate in the connective tissue of the oral lichen planus lesions.Nous avons effectué une étude sur deux groupes de patients atteints de lichen plan buccal, le premier associé au diabètes sucré (N = 28) et le second (N = 44) sans cette association. Nous n’observons pas de différences significatives entre eux, en ce qui concerne la localisation du lichen plan dans la muqueuse buccale, le palais, les gencives ou le plancher bouche. Nous trouvons cependant une plus grande fréquence de la localisation au niveau de la langue dans le lichen plan avec diabètes. Mais en même temps, nous détectons une fréquence plus importante de lésions atrophiques-érosives dans le premier groupe que dans le second.En dernier lieu, il n’existe pas de différences entre les deux, en ce qui concerne la quantité, en valeur absolue, de l’infiltration inflammatoire dans les tissus conjonctifs des lésions buccales du lichen plan

Ni oírlos ni decirlos. Donde aguardan los secretos, una aproximación a la familia moderna

[spa] El presente texto se introduce en el desconocido microcosmos de las prácticas y las emociones que giran en torno al secreto o los secretos en la vida cotidiana de la edad moderna. La sinuosidad de su existencia lleva a indagar en las relaciones entre las personas, ya que el secreto no existiría fuera de ellas. Por lo tanto el tema se enmarca en espacios que permiten entenderlo desde su oponibilidad, frente a lo demás, a lo mayoritario, lo público o lo normalizado. En este sentido el secreto puede contribuir al conocimiento de las divergencias y contradicciones existentes en el seno de la familia normalizada, nos acerca a la riqueza de su polifacética realidad y es parte de su construcción político-moral.[eng] This text is about the practices and emotions that build the secret or secrets in the everyday life in early modern history. The sinuosity of its existence leads historians to research the relationship between people, because the secret not exist outside them, as a space reserved, desire for protection and behavioural strategy. So the issue is important in a context of opposing elements, compared to the rest, to the public and to the normalized. In this sense the secret should contribute to the knowledge of the dualities and contradictions in the family, and is her political and moral building element

Bottom-quark mass from finite energy QCD sum rules

Finite energy QCD sum rules involving both inverse and positive moment integration kernels are employed to determine the bottom quark mass. The result obtained in the $\bar{\text {MS}}$ scheme at a reference scale of $10\, {GeV}$ is $\bar{m}_b(10\,\text{GeV})= 3623(9)\,\text{MeV}$. This value translates into a scale invariant mass $\bar{m}_b(\bar{m}_b) = 4171 (9)\, {MeV}$. This result has the lowest total uncertainty of any method, and is less sensitive to a number of systematic uncertainties that affect other QCD sum rule determinations.Comment: An appendix has been added with explicit expressions for the polynomials used in Table

Cooperative Project-based Learning for Machine Design in the Industrial Engineering Program: Methodologies and Experiences

Non

Charm Quark Mass

We report on the result for the charm quark mass as obtained from our lattice QCD computation in the quenched approximation. Our result in the MSbar scheme is m_c(m_c)=1.26(4)(12) GeV.Comment: 12 pages, 1 PostScript figure (version to appear in Phys.Lett.B

Influence of root width and dentin wall thickness evaluated by endoscopy upon the outcome of periapical surgery. A cohort study

Background: An analysis was made of the correlation between root width, the thickness of the remaining dentinal wall as determined by endoscopy, and the outcome of periapical surgery. Material and Methods: A retrospective cohort study was carried out involving patients subjected to periapical surgery between 2017 and 2019 at the University of Valencia (Valencia, Spain). One year after surgery, cone-beam computed tomography (CBCT) was used to evaluate healing against the preoperative volumes. The maximum root width was measured on the postoperative CBCT scan at the apical section of the treated root. This measurement was transferred to the intraoperative endoscopic image, where the minimum root width, peripheral dentin thickness, and minimum dentin thickness were recorded. Root measurements, and the position (maxillary or mandibular) and type of tooth (roots of incisors, canines, premolars or molars) were further correlated to periapical surgery outcome. Results: A total of 51 patients, comprising 52 teeth and 62 roots, were included in the study. The mean measurements were: maximum root width (4.13 +/- 0.84 mm), minimum root width (2.46 +/- 0.72 mm), peripheral dentin thickness (0.77 +/- 0.2 mm) and minimum dentin thickness (0.4 +/- 0.2 mm). The success rate was 82.2%. Premolar roots showed a greater minimum dentin thickness (0.58 +/- 0.25 mm) ( p<0.003) than incisor roots. No significant association was found between the different measurements and the healing rate at one year, though the roots that failed to heal showed smaller minimum dentin thickness values than the roots that healed correctly. The position and type of tooth did not influence healing outcome. Conclusions: The root width and thickness of the remaining dentin wall did not significantly influence healing. However, the roots that failed to heal showed smaller minimum dentin thickness values than the roots that healed correctly