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At least 163 records · Page 9Linked to original sources
PubMed1996

Lip adaptation to simulated dental arch expansion. Part 1: Reliability and precision of two lip pressure measurement mechanisms.

Understanding the influence of lip and tongue pressure on tooth position requires a reliable method of measuring pressure. A transducer with a beam mechanism has been used extensively in the past. A transducer with a diaphragm mechanism has been recently introduced. Comparative in-vivo tests of these transducers have not been published. The purpose of this study was to investigate transducer reliability and precision. Transducers were placed intraorally in 22 subjects, and two lip pressure measurements were recorded. Paired t-tests and interclass correlations were used to evaluate repeatability and reliability. The error of the method was analyzed for each transducer type. Both transducer types produced measurements that were repeatable and reliable. The error was smaller for the diaphragm transducer. The diaphragm transducer is more precise.

Adaptation, Physiological↗
PubMed1993

Allergic contact dermatitis of the lip margins from para-tertiary-butylphenol in a lip liner.

We describe the use of gas chromatography with mass spectrometry (GC-MS) in the investigation of a case of allergic contact dermatitis of the lip margins caused by a lip liner. Patch testing identified sensitization to para-tertiary-butylphenol-formaldehyde resin (PTBP-FR), a resin glue frequently used in leather work but rarely found in cosmetics. Investigation specified the para-tertiary-butylphenol (PTBP) component of the resin as the hapten responsible for the allergic contact dermatitis, as well as for associated depigmentation.

Adult↗
PubMed1990

The Sri Lankan Cleft Lip and Palate Project: the unoperated cleft lip and palate.

Since 1984, the Sri Lankan Cleft Lip and Palate Project has developed a large surgical and research program collecting records on over 500 subjects with unrepaired cleft lip and palate. In addition, 410 operations were performed by Project and will be followed by individual reports on facial growth and morphology, speech, surgical and anesthetic aspects, and the otologic significance of cleft palate in this issue and subsequent ones.

Adolescent↗
PubMed1999

A multicenter retrospective 3D study of serial complete unilateral cleft lip and palate and complete bilateral cleft lip and palate casts to evaluate treatment: part 1--the participating institutions and research aims.

OBJECTIVE: To compare the multicenter retrospective and prospective spatiotemporal (4D) serial analyses of complete unilateral (CUCLP) and complete bilateral (CBCLP) cleft lip and palate casts that had undergone different treatment procedures. The involved institutions are Miami Craniofacial Anomalies Foundation, South Florida Cleft Palate Clinic; University Hospital of Nijmegen Cleft Palate Center; Free University of Amsterdam Cleft Palate Center; Academic Hospital (Dijkzigt/Sophia) Rotterdam Cleft Palate Center; Center for Craniofacial Anomalies, University of Illinois College of Medicine; Cleft Palate Center, Sahlgrenska University Hospital, Göteborg, Sweden; and Children's Memorial Medical Center, Northwestern University Cleft Palate Institute. DESIGN: Using serial casts of the upper jaw and an electromechanical digitizer with special Cad-Cam software (CadKey), the occlusal relationships and morphometric palatal growth changes that occur under the influence of presurgical orthopedics and various surgical procedures will be studied. It is anticipated that 3D geometric data extracted from serial casts will identify the important geometric palatal parameters present before cleft surgical closure, which will supply objective criteria for establishing a scientific basis for improved surgical therapy. This research study will test three hypotheses: (1) Conservative (varying the timing of surgical cleft closure according to the size of the cleft space) lip and palatal surgery will permit "catch-up" palatal growth and normalize palatal growth and development. (2) The amount of mucoperiosteal tissue relative to the size of the cleft space is important in determining the timing of palatal surgery, as it influences the degree of scarring and ultimately the palate's adult size and form. (3) Presurgical orthopedics (the use of appliances soon after birth) can stimulate palatal growth beyond its normal growth potential. RESULTS: In a previous project and again after reviewing the data already collected during the first year of this study, it has been shown that incremental changes in size of palatal segments in CUCLP and CBCLP cases prior to surgery vary slightly. The CBCLP cases grow slightly faster than CUCLP cases before surgery, but growth of the CBCLP cases decreases in acceleration after surgery. Reasons for these differences will be determined when more cases are analyzed and subjected to biostatistical analysis.

Adolescent↗
PubMed2007

Congenital missing permanent teeth in Korean unilateral cleft lip and alveolus and unilateral cleft lip and palate patients.

OBJECTIVE: To investigate the differences in the congenital missing teeth pattern in terms of tooth type (permanent maxillary lateral incisor [MLI] and maxillary second premolar [MSP]) and sidedness (cleft vs noncleft) between boys and girls in Korean unilateral cleft lip and alveolus (UCLA) and unilateral cleft lip and palate (UCLP) patients. MATERIALS AND METHODS: This study used the charts, models, radiographs, and intraoral photographs of 90 UCLA patients and 204 UCLP patients (ages 6 to 13 years). Binomial test, chi-square test, Fisher exact test, maximum likelihood analysis of variance, and the odds ratio were performed. RESULTS: According to the relationship between the congenital missing teeth pattern and the cleft type, the UCLP patients had 2.98 times more missing MLIs and 1.80 times more missing MSPs than did the UCLA patients. The MLI was congenitally missing more in boys than in girls, but the MSP showed the opposite tendency. Boys had a higher frequency of congenital missing MLIs and MSPs on the cleft side than did girls. However, on the noncleft side and both sides, girls had a higher frequency of congenital missing MLIs and MSPs than did boys. Results showed a gender-dominant pattern of congenital missing MLIs and MSPs. CONCLUSION: These results suggest that gender and cleft type might affect the congenital missing teeth pattern in terms of tooth type and sidedness.

Adolescent↗
PubMed1989

[Epidemiological investigation of cleft lip and/or palate. II. Incidence of cleft lip and palate among Japanese babies in Gifu prefecture 1986 to 1987].

Since 1981 we have been conducting investigations in Aichi Prefecture where our institution is located in close cooperation with Medical Association of Obstetrics-Gynecologists and member physicians of the Midwives Association. In addition, we surveyed 111 institutions in Gifu Prefecture for the patient who was delivered from January 1, 1986 to December 31, 1987 to learn the incidence and type classification of cleft lip and/or palate in the general population Gifu. Consequently, we acquired the date of 20667 newborns. It was found as a result that 35 babies had these abnormalities and that ratio of the birth of such newborns was one for 590.5 deliveries. Among 35 cleft infants 12 (34.3%) with cleft lip and palate, 5 (14.3%) cleft palate. Looking at the estimates from the results of our investigation, the annual number of newborns with these disease in the Gifu Prefecture was 41.6 to 41.9 in 1986, 33.5 to 33.6 in 1987 with 95 percent confidence limits.

Cleft Lip↗
PubMed1978

Lip adhesion and its effect on the maxillofacial complex in complete unilateral clefts of the lip and palate.

The use of a lip adhesion as part of the treatment program for wide complete clefts of the lip and palate is gradually being accepted. Heretofore, little mention has been made as to its actual beneficial effects. Since the introduction of this procedure by our Group in 1966, it has been used routinely by us. Its effects on the maxillofacial complex is discussed in detail.

Age Factors↗
PubMed1989

A comparative study of the skin envelope of the unilateral cleft lip nose subsequent to rotation-advancement and triangular flap lip repairs.

The secondary nasal skin envelope asymmetries were studied after unilateral cleft lip repair using the original (obsolete) rotation-advancement (Millard I) and the triangular flap techniques (Bardach's modification). Secondary correction of the nasal deformity was not performed in either group. Our findings indicated that in both groups, vertical asymmetries of the nasal skin envelope were similar. The alar dome on the cleft side was depressed, the columella was shorter on the cleft side, and there was hooding at the nostril apex. The principal difference between the two lip repairs was observed in the horizontal dimension of the nasal skin envelope. The position of the alar base was more normal following the Millard I repair, while the triangular flap repair left the alar base laterally displaced. When considered together with flattening of the cleft alar dome, a horizontal skin-envelope deficiency from middome to lateral alar crease was produced in the Millard I group. More lateral positioning of the alar base after the triangular flap technique minimized this horizontal skin deficiency. The triangular flap technique produced a secondary nasal deformity that looked worse but was easier to correct. The clinical implications of these findings are discussed.

Adolescent↗
PubMed1989

Evaluation of craniomandibular dysfunction in children 6 to 10 years of age with unilateral cleft lip or cleft lip and palate: a clinical diagnostic adjunct.

It is becoming increasingly apparent that a clinical evaluation for craniomandibular dysfunction in children is important for predicting future problems in adults. Because of the dysmorphology inherent in children with clefts, there is potential for craniomandibular dysfunction in many cases. The prevalence of craniomandibular dysfunction in white children with unilateral cleft lip or cleft lip and palate from 6 to 10 years of age was investigated. Thirty children (22 males and eight females) were examined. Craniomandibular dysfunction was detected clinically by the following criteria: mandibular movements; deflection of the mandible on opening; temporomandibular joint (TMJ) sounds; and muscle and temporomandibular joint tenderness to palpation. Information related to subjective symptoms (headaches, difficulties in opening wide, pain in the temple region, pain in opening wide, pain in chewing, and reported clicking) was collected by interview. The results showed that the prevalence of objective and subjective symptoms was 76.6 and 53.3 percent, respectively. The most frequent symptom was muscle tenderness (60 percent), followed by temporomandibular joint tenderness (26.6 percent), temporomandibular joint sounds (20 percent), and headaches (16.6 percent). Statistically significant differences by cleft type were not found in the prevalence of any objective or subjective symptom. Significant correlation was found only between temporomandibular joint tenderness and muscle tenderness. Because the overall prevalence of symptoms is shown to be high in the sample studied, routine dental examinations of patients with clefts should include an evaluation of the masticating system.

Child↗
PubMed2004

Oxygen gas-induced lip-lip interactions on a double-walled carbon nanotube edge.

We have investigated adsorption of an O(2) molecule on a double-walled carbon nanotube (DWCNT) edge using density functional theory calculations. An O(2) molecule adsorbs exothermally without an adsorption barrier at open nanotube edges that are energetically favorable with a large adsorption energy of about -9 eV in most cases. Dissociative adsorption of an O(2) molecule induces various spontaneous lip-lip interactions via the bridged carbon atoms, generating the closed tube ends. This explains why the DWCNTs are chemically more stable than the single-walled nanotubes during observed field emission experiments. The field emission takes place via the localized states of the bridged carbon atoms, not via those of the adsorbed oxygen atoms particularly in the armchair nanotubes. We also find that some O(2) precursor states exist as a bridge between tube edges.

Journal Article↗
PubMed2001

Correction of the bilateral complete cleft lip: transformation to a unilateral incomplete cleft lip closure.

The complete lip alveolus and cleft palate is the most difficult of all bilateral clefts to treat because of the deformity of and tissue insufficiency in the prolabium. A bilateral concomitant procedure is impractical for treatment of this condition because of the problems that have to be resolved postoperatively, including a short columella, a lack of philtrum, labial horizontal and vertical insufficiency, and vermilion and alveolar vestibulum insufficiency. A two-stage procedure called the transformation method has been developed to circumvent these problems, and the authors present it here. With this method one side is closed completely using the maximum amount of tissue available. Concomitantly, incomplete closure is performed on the other side. The result at the end of the first stage of the procedure is a condition approximating unilateral incomplete closure. The results were obtained from 6 patients who underwent complete bilateral closure and were followed for at least 2 years with satisfactory results.

Child, Preschool↗
PubMed2002

Surgical results of primary lip repair using the triangular flap method for the treatment of complete unilateral cleft lip and palate: a three-dimensional study in infants to four-year-old children.

OBJECTIVE: To evaluate morphological problems for children with complete unilateral cleft lip and palate (UCLP). DESIGN AND SETTING: A cross-sectional study was performed on 46 patients with complete UCLP at Osaka University Dental Hospital. PATIENTS AND PARTICIPANTS: The method was applied to three groups of children with UCLP (8 4-month-old infants, 18 1.5-year-old children, and 20 4-year-old children). MAIN OUTCOME MEASURES: The three-dimensional coordinates of facial landmarks were extracted automatically from XYZ data sets and from photo images produced by an optical surface scanner. RESULTS: The intercanthal distance, nose width, and mouth width were closer to those of normal children in the older group. Deviation of the columella toward the noncleft side was smaller in the 4-year-old group. The angle of the nasal tip was large in all groups. Asymmetry of the ala was conspicuous at the upper part of the nose in the vertical dimension. Asymmetry of the nostril was observed in the vertical dimension and in the anteroposterior dimension in the 4-year-old group. The angle of the Cupid's bow was obtuse on the noncleft side, and the bottom of the Cupid's bow deviated toward the cleft side. The Cupid's bow was longer on the noncleft side. Protrusion of the vermilion was poor in all groups.

Cephalometry↗
PubMed1985

Correction of residual deformities of the lip and nose in repaired clefts of the primary palate (lip and alveolus).

Residual deformities of the lip and nose in individuals with repaired unilateral and bilateral clefts may very in severity depending on the state of the original defect, the care taken in the initial surgical procedure, the pattern of the patient's facial growth, and the effectiveness of interceptive orthodontic techniques. Because each patient has a unique combination of deformities, their surgical reconstruction usually requires the modification and combination of several surgical techniques. In this article, a summary of various reconstructive techniques is presented, beginning with an evaluation of secondary cleft defects.

Alveoloplasty↗
PubMedDate not supplied

Upper and lower lip augmentation by buried, deepithelialized local flaps: an alternative to the use of foreign material implants when shortening the lips.

Augmentation of the lips has become a new request among patients searching for aesthetic improvement, although it is a very old goal among plastic surgeons when enhancing facial harmony. The simplicity of injecting synthetic material may have contributed to this request; nevertheless, the short-term duration and bizarre results seen with these materials, convinces us to the beneficial effects of our "good, old-fashioned" surgical methods with autologous tissues.

Aged↗
PubMed2005

Chlorhexidine in cleft lip and palate patients with multibracket appliances. Results of a prospective study on the effectiveness of two different chlorhexidine preparations in cleft lip and palate patients with multibracket appliances.

AIM: The aim of this study is to reduce the caries risk in cleft lip and palate (CLP) patients with multibracket appliances via a compliance-independent method. PATIENTS, MATERIALS AND METHODS: Sixty-eight CLP patients with multibracket appliances were submitted to professional tooth cleaning at 4-week intervals. After randomization, patients in group A wore a splint filled with chlorhexidine (CHX) gel (Chlorhexamed) for 15 minutes (3 x 5 min) every 12 weeks. Patients in group B were treated with CHX varnish (EC40) every 12 weeks. Fluoride varnish (Fluoridin) was applied to all teeth 4 and 8 weeks after the respective CHX treatments. Regular salivary bacteria counts (CRT) were carried out to determine therapeutic effectiveness. Initial DMFS values were compared to the final ones. RESULTS: Initial findings of the salivary test and DMFS index confirmed the high caries risk. The DMFS value increased dramatically in both groups despite this systematic prophylaxis program. The bactericidal effect of both CHX preparations turned out to be markedly weaker than that described in the literature. CONCLUSIONS: Though the CHX and fluoride application had a limited effect (at least in this test population), one should keep in mind that it is precisely this population that requires very intensive prophylaxis, and that no antibacterial adjuvant is more effective than CHX. However, the application interval should be individually adapted to the bacteria count.

Adolescent↗